what is permutation test how to pick data from different time period and compare them permutation of the test set in t test definition what type of data would be a test for the sass what is the purpose of random picking how to pick a time period what is statistical testing of time period what to do with a time period for data set permutations quizlet what does it mean when a set of time period is a reference set what kind of data are test sets how to randomly choose a data setting from a large amount of data? how does random picking work in regression how does data permutation work can you pick up a reference set randomly what is the purpose of permuting a reference set how to find out the statistical significance of a sample using a test set what is an example of random pick and permutation? what is a random selection in statistical testing what test is a reference set in statistics how to pick a reference set