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st: Cummulative sum & dealing with time


From   "kelly johnson" <econometrics@hotmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Cummulative sum & dealing with time
Date   Thu, 05 May 2005 08:37:29 -0400

hi,

how do i genrate a cummulative sum for a variable. eg. my data looks like this

date time Var1

i want to create a new variable that is a running sum of Var1 (eg. the first obs is the same, the second obs= the first obs + the second obs, etc.).

also, what is the best way to deal with time? i have a date in the mm/dd/yy formate and the minites of the date in hh:mm format. what is the best way to format and use my time variable.

thanks,

kelly

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