## Two very annoying statistical fallacies with p-values

Some time ago, I wrote on Reddit: There are two errors that I see quite frequently: Conclude from the fact that a statistically significant difference was found to that a significant socially, scientifically or otherwise difference was found. The reason this won’t work is that any minute difference will be stat.sig. if N is large…

## Simpler way to correct for restriction of range?

Restriction of range is when the variance in some variable is reduced compared to the true population variance. This lowers the correlation between this variable and other variables. It is a common problem with research on students which are selected for general intelligence (GI) and hence have a lower variance. This means that correlations between…

## Correlations and likert scales: What is the bias?

A person on ResearchGate asked the following question: How can I correlate ordinal variables (attitude Likert scale) with continuous ratio data (years of experience)? Currently, I am working on my dissertation which explores learning organisation characteristics at HEIs. One of the predictor demographic variables is the indication of the years of experience. Respondents were asked…

## Workgroup: Doing Bayesian Data Analysis: A Tutorial Introduction with R and BUGS

I started a workgroup for going thru the Doing Bayesian Data Analysis: A Tutorial Introduction with R and BUGS book. See thread on forum.

## W values from the Shapiro-Wilk test visualized with different datasets

For a mathematical explanation of the test, see e.g. here. However, such an explanation is not very useful for using the test in practice. Just what does a W value of .95 mean? What about .90 or .99? One way to get a feel for it, is to simulate datasets, plot them and calculate the…

## Comments on Learning Statistics with R

So I found a textbook for learning both elementary statistics much of which i knew but hadnt read a textbook about, and for learning R. http://health.adelaide.edu.au/psychology/ccs/teaching/lsr/ book is free legally https://www.goodreads.com/book/show/18142866-learning-statistics-with-r Numbers refer to the page number in the book. The book is in an early version (“0.4”) so many of these are small errors…

## Analysis of top 200 (199) data from the Starcraft 2 European ladder

Two days ago, Blizzard posted some statistical data about the top 200 (really is 199) players in Europe. I did a bit of statistical analysis on that data and made some nice illustrations as seen below. The data is self-explanatory, but the explanation is unknown to me. It need not necessarily be the case that…