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Absence of evidence is evidence of absence? | Lies and Stats
https://liesandstats.wordpress.com/2009/01/25/absence-of-evidence-is-evidence-of-absence
Absence of evidence is evidence of absence? On 25 January 2009. In the context of logical reasoning, and using Bayesian probability, you can argue that absence of evidence is, in fact, evidence of absence. Namely, not being able to find evidence for something changes your thinking. Nick Barrowman has an interesting post. On the topic, and I wanted to participate in the discussion. This paper was the nail in the coffin, if you will, in a previous discussion. I was having with a group of statisticians).
liesandstats.wordpress.com
You can’t increase power to prove the null | Lies and Stats
https://liesandstats.wordpress.com/2008/10/31/you-cant-increase-power-to-prove-the-null
You can’t increase power to prove the null. On 31 October 2008. In my last post I discussed the theory of hypothesis testing, and specifically how it does not support the idea of “ proving the null hypothesis. Which I’ll use as my main reference. Low p-value, high power; high p-value, low power. But what does this actually tell you? The null (weak yet also contradictory statements). Consider two experiments in which you failed to reject the null. Of no treatment effects, but in which the first experiment...
randomvariation.blogspot.com
Random Variation: September 2013
http://randomvariation.blogspot.com/2013_09_01_archive.html
Things go wrong. The odds catch up. Probability is like gravity: you cannot negotiate with gravity." Det. James 'Sonny' Crockett, Miami Vice The Movie. Thursday, September 12, 2013. A Flowchart For Quibbling With Research Results. This is a deceptively serious tongue-in-cheek (particularly the first line) flowchart from Dylan Matthews. You can use it to argue against a particular research result you don't like or, better yet, to anticipate attacks on your own research. Subscribe to: Posts (Atom). Dse (Dy...
randomvariation.blogspot.com
Random Variation: March 2012
http://randomvariation.blogspot.com/2012_03_01_archive.html
Things go wrong. The odds catch up. Probability is like gravity: you cannot negotiate with gravity." Det. James 'Sonny' Crockett, Miami Vice The Movie. Saturday, March 10, 2012. Six Useful Classes of Linear Models. As my students like to call it) is a difficult subject to teach with many seemingly unrelated and obscure concepts, many of which are listed under "Background Links" in the right-hand column. Compare Statistics to Calculus, another difficult topic for students. In the Calculus. Distribution th...
randomvariation.blogspot.com
Random Variation: A Better Black Friday Retail Sales Model
http://randomvariation.blogspot.com/2012/12/a-better-black-friday-retail-sales-model.html
Things go wrong. The odds catch up. Probability is like gravity: you cannot negotiate with gravity." Det. James 'Sonny' Crockett, Miami Vice The Movie. Friday, December 28, 2012. A Better Black Friday Retail Sales Model. Two earlier posts ( here. Described a simple hierarchical linear model (HLM) for Black Friday Retail Sales using data from an article in the Washington Post ( here. The pedagogical purpose of the HLM exercise was to display one answer to Simpson's Paradox. View my complete profile. Coal ...
randomvariation.blogspot.com
Random Variation: November 2011
http://randomvariation.blogspot.com/2011_11_01_archive.html
Things go wrong. The odds catch up. Probability is like gravity: you cannot negotiate with gravity." Det. James 'Sonny' Crockett, Miami Vice The Movie. Friday, November 25, 2011. This blog will deal with random topics in statistical analysis. Subscribe to: Posts (Atom). View my complete profile. Statistical Modeling, Causal Inference, and Social Science. How is preregistration like random sampling and controlled experimentation. Econometrics Beat: Dave Giles' Blog. Is the Trump Rally a "Sugar High"?
randomvariation.blogspot.com
Random Variation: September 2012
http://randomvariation.blogspot.com/2012_09_01_archive.html
Things go wrong. The odds catch up. Probability is like gravity: you cannot negotiate with gravity." Det. James 'Sonny' Crockett, Miami Vice The Movie. Monday, September 24, 2012. In a prior post ( here. I introduced the Dyestuff data set. At first, one might be tempted to run an analysis of variance (. On this data since the stated intention is to analyze. The ANOVA model is equivalent to the standard. Here, all the terms represent matrices: Y. M1 - lm(Yield Batch,Dyestuff,x=TRUE). Min 1Q Median 3Q Max.
randomvariation.blogspot.com
Random Variation: Black Friday Sales and Store Size
http://randomvariation.blogspot.com/2012/12/black-friday-sales-and-store-size.html
Things go wrong. The odds catch up. Probability is like gravity: you cannot negotiate with gravity." Det. James 'Sonny' Crockett, Miami Vice The Movie. Tuesday, December 4, 2012. Black Friday Sales and Store Size. The conventional wisdom about Black Friday (the day after Thanksgiving) Shopping in the US. Is that it is the primary driver of retail sales for the year! Economic reasoning would tell us that retailers would not be opening earlier and earlier, creating labor problems. View my complete profile.
randomvariation.blogspot.com
Random Variation: The 'hlmmc' package
http://randomvariation.blogspot.com/2012/09/the-hlmmc-package.html
Things go wrong. The odds catch up. Probability is like gravity: you cannot negotiate with gravity." Det. James 'Sonny' Crockett, Miami Vice The Movie. Sunday, September 16, 2012. From July 1 through August 15, I taught Sociology S534 Advanced Sociological Analysis: Hierarchical Linear Models. At the University of Tennessee in Knoxville. A syllabus for the course is available here. It explains how to download the software and how each function in the package can be used (also, see NOTE below). Typically,...
randomvariation.blogspot.com
Random Variation: October 2012
http://randomvariation.blogspot.com/2012_10_01_archive.html
Things go wrong. The odds catch up. Probability is like gravity: you cannot negotiate with gravity." Det. James 'Sonny' Crockett, Miami Vice The Movie. Sunday, October 14, 2012. HLMs: The ML Estimator. In a prior post ( here. Package has been developed by Doug Bates at the University of Wisconsin and is considered state-of-the-art for ML estimation of mixed models, that is, models with both fixed and random effects, such as hierarchical models. Package documentation is available here. Given at the UseR!
