SHUFFLEVAR: Stata module to shuffle variables relative to the rest of the dataset

shufflevar takes varlist and either jointly or for each variable shuffles varlist relative to the rest of the dataset. This means any association between varlist and the rest of the dataset will be random. Much like bootstrap or the Quadratic Assignment Procedure (QAP), one can build a distribution of results out of randomness to serve as a baseline against which to compare empirical results, especially for overall model-fit or clustering measures.