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st: Please help!

From   Lisa Sharwood <>
Subject   st: Please help!
Date   Tue, 11 May 2004 16:38:03 +1000

Hello and thank you for attending to my enquiry!!
I am a very new Stata user and plowing through the user guide and reference manuals to try and perform a calculation.... and I need help please!

I have two variables for which I have converted the list of dates into real elapsed dates. I want to subtract one from the other and thus generate a new variable with that figure.. which will give me the amount of time the person has stayed in the study. I have managed to
'compare' the two variables but only in one observation at a time. Could you please tell me how to do it for all the observations, and can I use 'in 108/215' for example.
I hope this is understandable and I hope to hear from you soon. My ultimate aim is to perform Kaplan Mieir survival analysis on the data.

Thank you

Lisa Sharwood
Research Officer
Neurosciences Institute, Austin Health
Melbourne University
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