Factor analysis, like almost all of data analysis, is just matrix factorization. Let be a matrix containing observation of variables (or indicators). We suppose that the variables in can be written as linear combinations of unobserved (or latent) factors, so … Read more

Comments closed# Category: Blog

You don’t actually have to *do* multiple comparisons to have a multiple comparisons problem — comparisons that you might hypothetically have done maybe if the data had been different perhaps will do it. I’ll show you.

Suppose that you’re conducting … Read more

Comments closedThe Iowa Gambling Task has always been one of my favorite tasks, if only because it’s so much fun to analyze. In the standard version of the task, subjects select a card on each trial from one of four decks … Read more

Comments closedA while back, a friend of mine asked me to help out in a longitudinal project trying to predict cognitive decline in (otherwise healthy) older adults (Mulligan, Areshenkoff, & Smart, 2015). One of the measures we used was resting state … Read more

Comments closedOne can argue the choice of when to stop collecting data should be irrelevant to our choice of parameter estimates, since all information should be contained in the likelihood function. This principle underlies some criticisms of standard hypothesis testing, where … Read more

Comments closedOne major research program in our lab aims to understand how the motor system makes use of task related and perceptual information when planning and executing movement. For example, a right handed “reach and grasp” action is executed more quickly … Read more

Comments closedThis page contains an assortment of useful or informative examples/counterexamples in probability and statistics. I plan to continue updating this page as I come across new examples.

### A Bayes factor which contradicts the posterior

The following is an example of … Read more

Comments closed**Edit (05/11/15)**: The article has been retracted.

Psychological Science recently published a paper — *Sadness Impairs Color Perception*^{1} — which has been causing a bit of a ruckus on the statistics blogosphere. Psych Science already has a bit … Read more