Re: st: From: Qunzi Zhang <zhangqunzi@googlemail.com>

[Steve Samuels <sjsamuels@gmail.com>]

Please use an informative subject for your posts.

Steve

On Nov 4, 2012, at 1:17 PM, owner-statalist@hsphsun2.harvard.edu wrote:

Dear All,
I have a dataset as below

date          firm 1   firm2    firm3 .....(permno as identifer index for firm)
1970Jan01   1         2      nan
1970Jan02   1         2      nan
..........................................
1990Jan01   1        2        4
1990Jan02   1        2        4

.........................................
1990Jan01   1      nan       nan
1990Jan02   1      nan       nan


I would like to store the time/row index for the first nan value and
the first non-nan value in this data set. Can anyone give me an
example about how to do this?

Thanks
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