st: RE: duplicates in timevar in panels

["Dherani, Mukesh" <M.K.Dherani@liverpool.ac.uk>]

Dear Mahesh,
One command that I often use to find duplicates in panel data is:

sort panel_id timevar,stable
br panel_id timevar if (panel_id== panel_id[_n-1]| panel_id== panel_id[_n+1]) & (timevar==timevar[_n-1]|timevar==timevar [_n+1])

this is for identification of duplicates.  
If both the rows are absolutely similar then you may delete any of the row 

drop if if panel_id== panel_id[_n-1] & timevar==timevar[_n-1]



BW,
mukesh

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Mahesh Ramachandran
Sent: 26 June 2008 19:37
To: statalist@hsphsun2.harvard.edu
Subject: st: duplicates in timevar in panels

hello all,

I am working on a panel data set : 2000 households over 10 years(120 months)

It has a household identifier as panel id and year/month variable as timevar.

when I tried to tsset it, I get the following result:

. tsset panel_id timevar
repeated time values within panel
r(451);

My goal is to identify and isolates those panels which has repeated time values and remove the duplicates.
So I tried :
by panel_id: duplicates re timevar,

and response was that duplicates can not be combined with "by" command. Can you suggest me a way to remove
the duplicates.

Thanks,
MR
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