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Likelihood Ratios Explained
 
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Enroll in our online course: http://bit.ly/PTMSK DOWNLOAD OUR APP: 📱 iPhone/iPad: https://goo.gl/eUuF7w 🤖 Android: https://goo.gl/3NKzJX GET OUR ASSESSMENT BOOK ▶︎▶︎ http://bit.ly/GETPT ◀︎◀︎ This is not medical advice. The content is intended as educational content for health care professionals and students. If you are a patient, seek care of a health care professional. Kai explains in depth how to calculate likelihood rations using equations and the nomogram method. Pre-Test and Post-Test probabilities are also covered. Support us on Patreon: https://www.patreon.com/physiotutors Visit our Website: http://bit.ly/web_PT Like us on Facebook: http://bit.ly/like_PT Follow on Instagram: http://bit.ly/IG_PT Follow on Twitter: http://bit.ly/Tweet_PT Snapchat: http://bit.ly/Snap_PT
Views: 40900 Physiotutors
Wald test | Likelihood ratio test | Score test
 
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See all my videos here: http://www.zstatistics.com/videos/
Views: 8052 zedstatistics
Likelihood ratio test - introduction
 
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This video provides an introduction to the likelihood ratio test, as well as some of the intuition behind it. Check out http://oxbridge-tutor.co.uk/undergraduate-econometrics-course for course materials, and information regarding updates on each of the courses. Check out https://ben-lambert.com/econometrics-course-problem-sets-and-data/ for course materials, and information regarding updates on each of the courses. Quite excitingly (for me at least), I am about to publish a whole series of new videos on Bayesian statistics on youtube. See here for information: https://ben-lambert.com/bayesian/ Accompanying this series, there will be a book: https://www.amazon.co.uk/gp/product/1473916364/ref=pe_3140701_247401851_em_1p_0_ti
Views: 108314 Ben Lambert
Comparison of two regression models using Likelihood Ratio test
 
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Hello friends, Hope you all are doing great! This video describes how to compute LR test statistics to compare the fitness of two regression models. I have used R studio here. But you can use Stata, Eviews, or even MS Excel to compute F-test to compare two regression models. Subscribe the channel for such updates Please visit my blog: http://learningeconometrics.blogspot.in/ My website https://sites.google.com/site/sarveshwarinani/ See my research on my Google Scholar profile https://scholar.google.co.in/citations?user=RIelyLEAAAAJ&hl=en Ask me questions [email protected]
Views: 8727 Sarveshwar Inani
Chi-square test in SPSS + interpretation (assumptions violated)
 
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How to run a chi-square test and interpret the output in SPSS (v20) when the assumptions have been violated. ASK SPSS Tutorial Series
Views: 218252 BrunelASK
Likelihood Ratios
 
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A light-hearted crash course on how to calculate likelihood ratios in order to understand the utility of a diagnostic test. Developed at the University of Ottawa Faculty of Medicine by Claire Lee under the supervision of Dr. Ian McDowell.
Views: 9794 Claire Lee
The Likelihood Ratio Test
 
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http://AllSignalProcessing.com for more great signal-processing content: ad-free videos, concept/screenshot files, quizzes, MATLAB and data files. The likelihood ratio test maximizes the probability of correctly deciding hypothesis H_1 is true for any given probability of deciding H_0 is false when the hypotheses are both simple. Example showing the likelihood ratio test for a known signal in noise is a matched filter.
Views: 60551 Barry Van Veen
What is Likelihood Ratio test
 
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Hello friends, Hope you all are doing great! This video describes the likelihood ratio test. In next videos, I would describe how to compute LR test statistics. I have used R studio here. But you can use Stata, Eviews, or even MS Excel to compute F-test to compare two regression models. Subscribe the channel for such updates Please visit my blog: http://learningeconometrics.blogspot.in/ My website https://sites.google.com/site/sarveshwarinani/ See my research on my Google Scholar profile https://scholar.google.co.in/citations?user=RIelyLEAAAAJ&hl=en Ask me questions [email protected]
Views: 7824 Sarveshwar Inani
Likelihood Ratios vs Predictive Values: USMLE* Biostatistics-5
 
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#usmle #biostatistics #step3 My Video on Trends Affecting Predictive Values: https://www.youtube.com/watch?v=I86_EQFFYyE My Video on Calculating PPV and NPV: https://www.youtube.com/watch?v=PkzTlT_5Fws&t=6s copyright 2017 Seema Sharma *USMLE is a registered trademark of its respective holder. I am in no way affiliated with it. Disclaimer: Not for patient information
Likelihood ratio
 
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Do you fully understand the likelihood ratio? Our Step 1 Express Video of the Week tackles this high-yield topic from the epidemiology and biostatistics section of First Aid for the USMLE Step 1. We invite you to pull out your 2018 edition and open it to page 253 as Daniel Griffin walks you through this method of determining the usefulness of a diagnostic test. To see more of our Express Videos, we invite you to take the Rx Challenge and take the USMLE-Rx platform for a test drive. Along with sampling our extensive video library and immense collection of flash cards, see why 7 out of 10 students prefer questions from our Step 1 Qbank over test items from the competition. After your trial, you can enter to win a $500 gift card and a one-on-one counseling session with Dr. Tao Le, senior editor of First Aid. Learn more: http://go.usmle-rx.com
Views: 3390 USMLE-Rx
The Generalized Likelihood Ratio Test
 
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http://AllSignalProcessing.com for more great signal processing content, including concept/screenshot files, quizzes, MATLAB and data files. There is no universally optimal test strategy for composite hypotheses (unknown parameters in the pdfs). The generalized likelihood ratio test (GLRT) is a likelihood ratio in which the unknown parameters are replaced by their maximum likelihood estimates. Example of the GLRT for detecting a signal of known shape but unknown amplitude in noise of unknown variance.
Views: 23789 Barry Van Veen
Mod-34 Lec-34 Likelihood Ratio Tests - IV
 
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Statistical Inference by Prof. Somesh Kumar, Department of Mathematics, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 2322 nptelhrd
Likelihood Ratio
 
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Description
Views: 1290 Lorena Baccaglini
What Are Likelihood Ratios and How Are They Used
 
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Video describing the role of likelihood ratios in diagnostic testing
Views: 54376 Terry Shaneyfelt
Diagnostic Statistics - Part 3: Likelihood Ratio
 
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Part 3 integrates lessons learned about prevalence and test parameters, to apply them to a case to a specific patient. The calculators used in this video are from: mdcalc.com jamaevidence.mhmedical.com Clip art is from Microsoft word or freeware online. Please contact me and reference this like if you are using this content on your website.
Views: 4303 akbashevym
Likelihood of n independent samples from a Normal distribution
 
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Calculation of a likelihood function for n samples each independent, identically distributed from a Normal distribution (with a known variance). These short videos work through mathematical details used in the Multivariate Statistical Modelling module at UWE.
Views: 12963 deetoher
How to Use SPSS: Calculating Sensitivity, Specificity & Likelihood Ratios
 
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Determining accuracy and clinical usefulness of a diagnostic test. If you are interested only in calculating sensitivity and specificity, please see this video: http:--youtu.be-FaIR9vA5AX0
Explaining the Likelihood Ratio in DNA Mixture Interpretation
 
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In DNA identification science, the likelihood ratio (LR) assesses the evidential support for the identification hypothesis that a suspect contributed their DNA to the biological evidence. The LR summarizes the sensitivity and specificity of a statistical test. The LR logarithm is a standard information measure for stating the support for a simple hypothesis (i.e., a single assertion relative to its logical alternative). After Alan Turing's LR methods cracked the German Enigma code during World War II, LR usage became widespread. The LR is ubiquitous in the physical, biological, social, economic, computer and forensic sciences. First introduced into biological identification through paternity testing, the LR enjoys unparalleled international usage as the most informative DNA mixture statistic. Yet American crime labs shun the LR, and prefer to report DNA inclusion statistics that they find easier to explain in court. Such "inclusion" methods (variously termed PI, CPI, CPE or RMNE) use less of the DNA data, typically discarding a million-fold factor of identification information. Thus highly informative DNA mixture evidence can be reported as "inconclusive" or assigned an unrealistically low match score. Unfortunately, minimizing DNA evidence leads to a failure to identify criminals, with an adverse effect on public safety. To make the LR more acceptable to American analysts and their juries, we need more intuitive ways to explain the LR. Fortunately, the LR can be expressed (by Bayes theorem) in several equivalent ways. Stated in plain English, these alternative formulations include: 1. the information gain in the identification hypothesis from the DNA data, 2. how well the identification hypothesis explains the data, relative to its alternative, and 3. our increased belief in a match to a suspect, based on the inferred evidence genotype. The second LR formulation prevails in forensic DNA. While natural for computers and statisticians, non-mathematicians often find its formulas opaque. In this talk, we describe the other two formulations as intuitive ways to explain the LR simply and accurately. Moreover, these other approaches avoid the dread "transposed conditional." Using DNA case examples, we show how to easily understand the LR, present it in court, and deflect superficial challenges. For the American public to benefit from the full protective power of DNA identification information, analysts must be able to confidently explain the LR. This talk shows them how. http://www.cybgen.com/information/presentations/2010/ISHI/Perlin_Explaining_the_likelihood_ratio_in_DNA_mixture_interpretation/page.shtml
Views: 2364 TrueAllele
Wald Test - introduction
 
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This video provides an introduction to the Wald test, as well as some of the intuition behind it. Check out http://oxbridge-tutor.co.uk/undergraduate-econometrics-course for course materials, and information regarding updates on each of the courses. Check out https://ben-lambert.com/econometrics-course-problem-sets-and-data/ for course materials, and information regarding updates on each of the courses. Quite excitingly (for me at least), I am about to publish a whole series of new videos on Bayesian statistics on youtube. See here for information: https://ben-lambert.com/bayesian/ Accompanying this series, there will be a book: https://www.amazon.co.uk/gp/product/1473916364/ref=pe_3140701_247401851_em_1p_0_ti
Views: 70738 Ben Lambert
Diagnosis Likelihood Ratio Positive LR+ by Nye
 
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Critiquing Diagnostic Studies Using Positive Likelihood Ratios
Views: 918 Snippet Library
Chi-squared test and interpretation using SPSS (assumptions violated)
 
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A chi-squared test is preferred when correlating two categorical variables, one or both of which are nominal. This video shows how to compute a chi-squared test and how to interpret the output when assumptions have been violated. Please see the other chi-squared test video if assumptions have not been violated.
Views: 18044 BrunelASK
StatQuest: Probability vs Likelihood
 
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NOTE: This video was originally made as a follow up to an overview of Maximum Likelihood https://youtu.be/XepXtl9YKwc . That video provides context that gives this video more meaning. Here's one of those tricky little things, Probability vs. Likelihood. In common conversation we use these words interchangeably. However, statisticians make a clear distinction that is important to understand if you want to follow their logic. The good news is that they are both super simple. The bad news is that they are easy to get mixed up. The StatQuest gives you visual images that make them both easy to remember so you'll always keep them straight. For a complete index of all the StatQuest videos, check out: https://statquest.org/video-index/ If you'd like to support StatQuest, please consider a StatQuest t-shirt or sweatshirt... https://teespring.com/stores/statquest ...or buying one or two of my songs (or go large and get a whole album!) https://joshuastarmer.bandcamp.com/ ...or just donating to StatQuest! https://www.paypal.me/statquest
Mod-32 Lec-32 Likelihood Ratio Tests - II
 
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Statistical Inference by Prof. Somesh Kumar, Department of Mathematics, IIT Kharagpur. For more details on NPTEL visit http://nptel.iitm.ac.in
Views: 3615 nptelhrd
Cycle 3 - Topic 6: Likelihood Ratio Test
 
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Introduction to the Likelihood Ratio Test; Discussion over #37C from ASM manual, SOA #22 and #37.13 from ASM manual
Views: 5382 ACTUARYUTEXAS
Diagnosis Likelihood Ratio Negative (LR-) by Nye
 
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Explanation of Negative Likelihood Ratio (LR-)
Views: 875 Snippet Library
""Thinking About Likelihood Ratios for Pattern Evidence"- January 19, 2017
 
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This CSAFE Center Wide Meeting webinar was presented by Hal Stern from University of California. Description: The likelihood ratio has been proposed as a logical way to summarize forensic evidence. In pattern evidence disciplines; however, the application of likelihood ratios is challenging because of the high-dimensional data involved and the lack of relevant probability models (among other issues). Score-based likelihood ratios are one approach to handling the high-dimensional data issue. The webinar reviews likelihood ratios, their role in forensic science and the potential of score-based likelihood ratios
Views: 251 CSAFE forensicstats
How to Calculate a Negative Likelihood Ratio
 
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video describing the calculation of a negative likelihood ratio
Views: 11725 Terry Shaneyfelt
Monotone Likelihood Ratio I M 31 (stat)
 
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Subject:Statistics Paper: Statistical Inference I
Views: 926 Vidya-mitra
LIKELIHOOD RATIO TEST (LRT): Basic Ideas
 
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Paper: Statistical Inference III Module: Some further Properties of LRT Content Writer: Dr. Saurav De
Views: 1039 Vidya-mitra
Logistic Regression Details Pt 2: Maximum Likelihood
 
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This video follows from where we left off in Part 1 in this series on the details of Logistic Regression. This time we're going to talk about how the squiggly line is optimized to best fit the data. NOTE: This StatQuest assumes that you are already familiar with Part 1 in this series, Logistic Regression Details Pt1: Coefficients: https://youtu.be/vN5cNN2-HWE For a complete index of all the StatQuest videos, check out: https://statquest.org/video-index/ If you'd like to support StatQuest, please consider a StatQuest t-shirt or sweatshirt... https://teespring.com/stores/statquest ...or buying one or two of my songs (or go large and get a whole album!) https://joshuastarmer.bandcamp.com/ ...or just donating to StatQuest! https://www.paypal.me/statquest
How to Calculate a Positive Likelihood Ratio
 
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Video demonstrating how to calculate a positive likelihood ratio
Views: 27035 Terry Shaneyfelt
StatQuest: Maximum Likelihood, clearly explained!!!
 
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If you hang out around statisticians long enough, sooner or later someone is going to mumble "maximum likelihood" and everyone will knowingly nod. After this video, so can you! Also, some viewers asked for a worked out example that includes the math. Here it is! (you may need to click on the "Show More" button below to see the link) https://youtu.be/cDlNsHUBmw4 For a complete index of all the StatQuest videos, check out: https://statquest.org/video-index/ If you'd like to support StatQuest, please consider a StatQuest t-shirt or sweatshirt... https://teespring.com/stores/statquest ...or buying one or two of my songs (or go large and get a whole album!) https://joshuastarmer.bandcamp.com/ ...or just donating to StatQuest! https://www.paypal.me/statquest
Finite sample properties of Wald + Score and Likelihood Ratio test statistics
 
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Check out https://ben-lambert.com/econometrics-course-problem-sets-and-data/ for course materials, and information regarding updates on each of the courses. Quite excitingly (for me at least), I am about to publish a whole series of new videos on Bayesian statistics on youtube. See here for information: https://ben-lambert.com/bayesian/ Accompanying this series, there will be a book: https://www.amazon.co.uk/gp/product/1473916364/ref=pe_3140701_247401851_em_1p_0_ti
Views: 6233 Ben Lambert
Chi-square test in SPSS + interpretation
 
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How to run a chi-square test and interpret the output in SPSS (v20). ASK SPSS Tutorial Series
Views: 980005 BrunelASK
Finite sample properties of Wald + Score and Likelihood Ratio test statistics
 
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For more information on econometrics and Bayesian statistics, see: https://ben-lambert.com/
Views: 950 Ox educ
Likelihood Ratios
 
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Brief Introduction to likelihood ratios and how to use them clinically
Views: 552 Justin Adams
Module 11c Likelihood Ratios & Pretest/Posttest Probability
 
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The goal of this session is to to learn how to define and calculate likelihood ratios, and use them to calculate and interpret pretest/posttest probabilities. Likelihood ratios are used to assess how good a diagnostic test is and to help in selecting appropriate diagnostic test(s). - LRs have advantages over PPV and NPV because they are less likely to change with the prevalence of the disorder. - LRs can be calculated for several levels of the symptom/sign or test. - LRs can be used to calculate posttest probability for a disease of interest. Bayesian statistics is a field of statistics in which prior beliefs are quantified as pretest probabilities and combined with the LR to calculate posttest probabilities. - Allow interpretation of clinical screening or diagnostic tests within their clinical context.
Likelihood Ratio.mp4
 
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1. What is likelihood ratio? 2. What is use of likelihood ratio? 3. What distribution does likelihood ratio follows? VSP Group, my partner program. Get connected! https://youpartnerwsp.com/en/join?62916
Views: 6992 Gopal Malakar
Interpreting the Odds Ratio in Logistic Regression using SPSS
 
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This video demonstrates how to interpret the odds ratio (exponentiated beta) in a binary logistic regression using SPSS with one continuous predictor variable. Converting odds ratio to probability is reviewed. A binary logistic regression returns the probability of group membership when the outcome variable is dichotomous.
Views: 94154 Dr. Todd Grande
Pearson Chi-Square, Continuity Correction, and Fisher's Exact Test in SPSS
 
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This video demonstrates how and when to interpret Pearson Chi-Square, Continuity Correction (Yates’ Correction), and Fisher’s Exact Test in SPSS. The chi-square test is used to test the independence of two or more nominal variables.
Views: 22265 Dr. Todd Grande
Articles on Diagnostics - Understanding Likelihood Ratios
 
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In this video, I go over likelihood ratios as a tool to decide the quality of a new diagnostic test.
Views: 774 Tara Bishop MD
Cross tabulation through PSPP (Likelihood ratio test) - Part 2
 
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PSPP is a open source alternative to IBM SPSS. PSPP is freely available from https://www.gnu.org/software/pspp/. It is similar to SPSS and has SPSS like GUI menus for statistical analysis. In this video cast it was explained as how to perform cross tabulation and interpret chi-square statistic together with likelihood ratio test through its p value.
Sherlock Holmes and the DNA Likelihood Ratio
 
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After attending this presentation, attendees will better understand the principles of reporting DNA match results using a likelihood ratio (LR). By framing the apparently obscure notions of the LR in a more accessible literary setting, forensic practitioners can develop increased comfort with this important reporting and testifying skill. The presentation will impact the forensic community by enabling practitioners to more comfortably use the LR in their DNA match reporting. Mastery of the LR principle is critical for reporting out the most informative results from complex DNA evidence. Society depends on this accurate LR information for apprehending and convicting criminals. The principles of Bayesian inference (Bayes, 1763) were well known to the Victorians (Jevons, 1874). One master practitioner was detective Sherlock Holmes, who routinely employed a "balance of probabilities" to solve his fictional crimes (Doyle, 1890). Holmes deft use of the LR for weighing evidence (Good, 1950) regularly astounded his compatriots. His clarifying insights into applied inductive logic are particularly relevant to the modern reporting of DNA evidence. Chapter IV of the "Hound of the Baskervilles" (Doyle, 1902) finds Holmes and his companions breakfasting at a London hotel. They are pondering the origin of a cryptic letter that warns the new Baskerville lord to stay away from his ancestral home, lest he too share the fate of his prematurely deceased predecessor. Holmes examines the handwritten address and announces that the letter was written in a nearby hotel. "Guesswork!" scoffs a skeptic. "Rather," rejoins Holmes, "we balance probabilities." His ensuing explanation is a lucid gem of likelihood clarity. Sherlock Holmes' same Bayesian logic underlies the scientific reporting of DNA evidence. The identification hypothesis asserts that a suspect contributed his DNA to some biological evidence. The alternative hypothesis avers that someone else was the contributor. The LR balances the probability of the evidence assuming the identification hypothesis, relative to the data probability under the alternative hypothesis. The resulting weight of evidence provides an objective numerical LR match score that focuses on the data, and factors away prior prejudices. This talk presents the LR concept through the investigative eye of Sherlock Holmes. We will work through a literary case example, illustrating every step of the LR determination using words and pictures. These concepts will then be applied to the reporting of complex DNA evidence, such as DNA mixtures. Forensic DNA is an information science, with the LR providing a unifying information metric for all interpretation methods. Every valid DNA match score is a LR. Our talk advances practitioner understanding of the LR concept, facilitating its comfortable presentation in courtroom testimony. References 1. Bayes T. An essay towards solving a problem in the doctrine of chances. Phil Trans. 1763;53:370-418. 2. Doyle AC. The Sign of Four. London: Spencer Blacket, 1890. 3. Doyle AC. The Hound of the Baskervilles. London: George Newnes, Ltd, 1902. 4. Good IJ. Probability and the Weighing of Evidence. London: Griffin, 1950. 5. Jevons WS. The Principles of Science: A Treatise on Logic and Scientific Method. London: Macmillon & Co, 1874. http://www.cybgen.com/information/presentations/2011/AAFS/Perlin_Sherlock_Holmes_and_the_DNA_likelihood_ratio/page.shtml
Views: 1293 TrueAllele
StatQuest: Odds Ratios and Log(Odds Ratios), Clearly Explained!!!
 
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Odds Ratios and Log(Odds Ratios) are like R-Squared - they describe a relationship between two things. And just like R-Squared, you need to determine if this relationship is statistically significant. I go over all these details in this video so that you are ready for any odds ratio and log(odds ratio) situation that you might get yourself into!!! This StatQuest builds on the concepts covered in... Odds and Log(Odds): https://youtu.be/ARfXDSkQf1Y Enrichment Analysis using Fisher's Exact Test: https://youtu.be/udyAvvaMjfM For a complete index of all the StatQuest videos, check out: https://statquest.org/video-index/ If you'd like to support StatQuest, please consider a StatQuest t-shirt or sweatshirt... https://teespring.com/stores/statquest ...or buying one or two of my songs (or go large and get a whole album!) https://joshuastarmer.bandcamp.com/