how to divide data before testing the results why do i have to randomly divide a control between two groups of cases? how do you split your test by a certain type of phenotype what is the method to randomly split control how do you divide two groups of data do you randomly divide the data between cases can you randomly divide cases how do you divide a test by case? how do i separate a sample into two groups which is true about randomly splitting controls do you randomly divide cases between two groups of cases when can you find how many cases in the same set of data when is a control dividing can you divide your data in two groups can you divide a control between two groups how to split cases and controls in test can you randomly divide controls by phenotype why does a phenotype have two control groups can you randomly divide the controls between two groups of cases can you divide data to see which is better