In Paul Allison’s own words, “It’s about time!” The first edition of his book on logistic regression came out in 1999, and since then, “there have been an enormous number of changes and enhancements to the SAS procedures for doing logistic regression and related methods.” Allison has incorporated those changes
Suppose that you have two data vectors, x and y, with the same number of elements. How can you rearrange the values of y so that they have the same relative order as the values of x? In other words, find a permutation, π, of the elements of y so
Update 24Nov2015: The methods in this post no longer work for Twitter, as Twitter has discontinued support for its "share count" API that was used within the Twitter share buttons. But the Facebook method still works, and I've described a method for counting LinkedIn shares on another post. As of
