Bookmark and Share

Notice: On March 31, it was announced that Statalist is moving from an email list to a forum. The old list will shut down at the end of May, and its replacement, statalist.org is already up and running.


[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: recording the first/last non-missing/missing values position


From   Qunzi Zhang <zhangqunzi@googlemail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: recording the first/last non-missing/missing values position
Date   Sun, 4 Nov 2012 20:14:21 +0100

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(last) nan value and
the first(last) non-nan value in this data set. Can anyone give me an
example about how to do this in the do file?

Thanks
*
*   For searches and help try:
*   http://www.stata.com/help.cgi?search
*   http://www.stata.com/support/faqs/resources/statalist-faq/
*   http://www.ats.ucla.edu/stat/stata/


© Copyright 1996–2014 StataCorp LP   |   Terms of use   |   Privacy   |   Contact us   |   Site index