Hi All, please, could someone help me?
I have the data below:
Code:
* Example generated by -dataex-. To install: ssc install dataex
clear
input float(id x1 x2) str10 date
1 1 10 "24/09/2013"
1 1 12 "25/09/2013"
2 1 13 "24/09/2013"
2 1 15 "25/09/2013"
3 2 12 "05/10/2014"
3 2 17 "06/10/2014"
4 3 10 "05/10/2014"
4 3  9 "06/10/2014"
5 3  8 "05/10/2015"
5 3 12 "06/10/2015"
end

I need to create missing values for each id corresponding to 3 days before its date and 3 days after its date. How can I do that, please? So each id would have 2 obs with x1 non missing and 6 obs with x1 missing.

Many thanks. :-)