--- Joseph Wagner <[email protected]> wrote:
> I have a dataset of x-ray records with multiple records per patient.
> The records consist of id, age, and sex and I need to know how many
> persons had an x-ray when they were between the age of 17 and 25
> AND when when they were over 30. My attempts have been crude and I
> know there has to be a simple yet elegent way to do this.
This kind of problem usually becomes a lot easier when you first use
-reshape- to put the data into wide format.
Hope this helps,
Maarten
-----------------------------------------
Maarten L. Buis
Department of Social Research Methodology
Vrije Universiteit Amsterdam
Boelelaan 1081
1081 HV Amsterdam
The Netherlands
visiting address:
Buitenveldertselaan 3 (Metropolitan), room Z434
+31 20 5986715
http://home.fsw.vu.nl/m.buis/
-----------------------------------------
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