I merged two datasets with different cases; one dataset has two cohorts/comparison groups and the other dataset has one cohort, the experimental group. Some of the variables are named the same and some of them have different variable names, but mean the same thing. For example, in dataset1 with the comparison groups, new charges during the study period is named "AnyCharges" while in dataset2 with the experimental group, new charges is labeled new_charges." How do I get these variables to have the same name so that it's easier to analyze and do a crosstab? Thanks!