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st: 'XTSUR' with lagged indepvar - how to sort the data?

From   Daniel Schultheis <>
Subject   st: 'XTSUR' with lagged indepvar - how to sort the data?
Date   Wed, 3 Jul 2013 00:51:25 +0200

Dear Statalisters,

I have a question concerning the 'xtsur'- command for unbalanced
panels in Stata and cannot find the answer anywhere on the web (the
question itself I found several times :-)).

I am trying to use the 'xtsur' command with lagged independent variables in
my panel in Stata version 12.1. For the lagged effect, I used the time
series operators 'L.indepvar', 'L2.indepvar', ... , so I did not
create a new variable.

The panel is set with 'xtset' and and the data is sorted according
to the panel-variable "ID" and the time-variable "Date2". 'xtsur'
without lagged variables works perfectly fine. If I want to use xtsur
with the lagged indepenendent variable, the following error message

not sorted
               st_data():  3598  Stata returned error
              _xtsurub():     -  function returned error
                 <istmt>:     -  function returned error.

I tried to sort the data in descending order via 'gsort ID -Date2',
but the same error message occured.

Is there any possibility to sort or arrange my data so that I can use the
'xtsur' command to show the lagged effect via 'xtsur'?

Thank you so much for your help, it is very appreciated.

Best regards from Munich,
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