There was a post on TalkStats quite a while ago that I ended up recalling for another thread. I thought I’d post it here for a better reference and because the idea is important. A poster asked when it is appropriate to run a regression without an intercept. There was some discussion but mainly we [...]
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Normality is, perhaps, the most common assumption in statistics. Many tests and models are somehow related to a normal distribution. Testing for normality is a common procedure and we all know (or should know) how to test for univariate normality: we have the Shapiro-Wilk test, the Shapiro-Francia test, Skewness and Kurtosis coefficients and my personal [...]
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You can find the first two sections of this tutorial here: Principal Components Analysis – Step by Step (Part I) Principal Components Analysis – Step by Step (Part II) Hi! This is the last part of this tutorial, a tiny introduction to Principal Components Analysis. So far we have seen the basics of the analysis [...]
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