Re: st: how to reshape data so that can perform calculations

[Nick cox <njcoxstata@gmail.com>]

bysort id: keep if _N > 1

Nick

On 22 Mar 2011, at 15:10, "Kathleen Oberst"  
<Kathleen.Oberst@hc.msu.edu> wrote:
> I have a dataset with person ID, discharge date, and another  
> calculated
> field in a long format as follows:
>
> Id    discharge date    daysmissed    y
> x    1/1/2010        14        1
> x    2/1/2010        9        2
> y    1/5/2010        0        1
> z    2/8/10        25        1
> z    4/10/10        19        2
> z    9/30/10        8        3
>
>
> I'm trying to keep just those records of people who had >1 discharge  
> and
> then I want to calculate the elapsed time between dicharges. I  
> generated
> a marker 'y' to act as a counter for #admissions but can't really drop
> anyone where y equals 1 because I will need that first d/c date for  
> the
> subsequent calculation. I've not had luck with reshape. I tried  
> reshape
> but it appears since the daysmissed and y variables can change
> (appropriately so) between the records, it is not working (y not
> constant error message).  I'd welcome any suggestions. Than*   For  
> searches and help try:
> *   http://www.stata.com/help.cgi?search
> *   http://www.stata.com/support/statalist/faq
> *   http://www.ats.ucla.edu/stat/stata/
*
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