Yesterday, William M. Briggs ("Statistician to the Stars") posted on his blog a piece titled "How to Mislead With P-values: Logistic Regression Example".
Here are some extracts which, hopefully, will encourage to read the post:
"It’s too easy to generate “significant” answers which are anything but significant. Here’s yet more—how much do you need!—proof. The pictures below show how easy it is to falsely generate “significance” by the simple trick of adding “independent” or “control variables” to logistic regression models, something which everybody does...............
Oh yes - don't forget to read the responses/comments for this post, here.
© 2013, David E. Giles