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  1. DOYLE1

    How do I create thus new column and variable?

    Hi Everyone, I need some help with a SAS problem. I am doing some research into twinning and need to identify a way of calculating the sex ratio of twins. What I want is to create a new column which will say FF for female/female twins, MM for male/male twins and MF for male/female twins. My...
  2. DOYLE1

    Counting variables in SAS

    Hi Everyone, I really need some help with this. I am doing research on twinning and I want to identify mothers who had more than one set of twins and calculate how many sets of twins they had. My data looks similair to this: Mother Father d.o.b. idtwin single/twin 010 210 15.3.99 01021015399 1...

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