Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at statalist.org.


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

st: creating lagged variables


From   "[email protected]" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: creating lagged variables
Date   Sat, 10 Aug 2013 17:13:59 +0000

Dear Stata list users,
I have a multilevel dataset where I have individual survey responses  collected at different time points( waves but different years), and country level data.Some countries are in all waves, some are only in some of them.
I would like to generate a lagged independent variable. I would like to take an average of its values at t-1, t-2 and t-3 where t denotes a year when there was a survey study for a particular country. 
I don't know what command to use in stata for  'at' or 'when' .
.by country year: egen meanlaggedx=3D mean(x(at time-1) x(at time-2) x(at time-3)) is pretty much what I am trying to do, but to no avail. How do I specify a variable a certain time point?

For some reason the usual lag command does not respond in my dataset. 
I appreciate any help or suggestion.
Thanks,
Sule
*
*   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 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index