Date Variables: Multiple Date Observations put into one observation with multiple date variables

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Date Variables: Multiple Date Observations put into one observation with multiple date variables

Hello Community,

I just need help getting ideas on how to approach this and it seems simple, but I can only think of inefficient ways to get this done.

I have information dealing with start and end dates but it is currently set up so that if a person comes in multiple times, it's a separate observation in itself

id   start            end

1    1/1/10          1/10/10

1    2/25/10         3/1/10

kind of like that.

I want to make it so it looks like this

id   start1          end1        start2          end2

1    1/1/10         1/10/10     2/25/10       3/1/10

Any guidance would be helpful.

Super User
Posts: 5,085

Re: Date Variables: Multiple Date Observations put into one observation with multiple date variables

Does efficiency really matter?  You only need to transform the data once.  Anyway here's one way (assuming your data is sorted by ID):

proc transpose data=have prefix=start out=start_dates;

   by id;

   var start;

run;

proc transpose data=have prefix=end out=end_dates;

   by id;

   var end;

run;

data want;

   merge start_dates end_dates;

   by id;

run;

You will find that some programming tasks are easier, but they now depend on you knowing how many start and end dates you have.

Good luck.

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