Hi, I am new to this forum but have been using STATA for a while for very basic statistical analysis. I would appreciate any help:
I have a dataset that has cases and controls matched on age, gender and number of years. So for every 18 year old female case with 2 years data, I have a 18 year old female control with 2 years of data.

I now want to divide my cases into 2 groups, say case1 and case 2. How do I separate the controls that match case 1 (and label them as control 1) and case 2(label them as control 2) so that I could present my analysis to compare age, gender, year matched case 1 with age, gender, year matched control 2, and so on. Please let me know if you need more info to help with this question. Thanks.