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st: Re: sum across observations until a certain cutpoint

From   "Martin Weiss" <>
To   <>
Subject   st: Re: sum across observations until a certain cutpoint
Date   Sun, 9 Nov 2008 17:00:34 +0100

Well, if you want the running sum, look at -help sum()-. But maybe you could give us a peek at your data structure, that would assist in answering your question...

----- Original Message ----- From: "Amanda Botticello" <>
To: <>
Sent: Sunday, November 09, 2008 3:12 PM
Subject: st: sum across observations until a certain cutpoint

I have a dataset of test items and the time (in seconds)to complete each item. I need to create a variable that sums the time variables up to a certain number -- i.e., 60, 90, 120 seconds. Is there a way I can use the egen newvar = rowtot (time*) command to count up to 60 seconds, etc?

Amanda L. Botticello, PhD, MPH
Outcomes Research Scientist
Kessler Medical Rehabilitation Research and Education Center
Assistant Professor
Department of Physical Medicine & Rehabilitation
UMDNJ-New Jersey Medical School

1199 Pleasant Valley Way
West Orange, NJ  07052
phone: (973)243-6973

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