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Re: st: From: Qunzi Zhang <[email protected]>
From
Steve Samuels <[email protected]>
To
[email protected]
Subject
Re: st: From: Qunzi Zhang <[email protected]>
Date
Sun, 4 Nov 2012 14:04:24 -0500
Please use an informative subject for your posts.
Steve
On Nov 4, 2012, at 1:17 PM, [email protected] 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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