Re: st: Cummulative sum & dealing with time

[Richard Goldstein <richgold@ix.netcom.com>]

for your first question, sound like you want the -sum- function (NOT the egen 
version); see -functions- in the manual or the help

Rich

kelly johnson wrote:


> 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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