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st: Add new observations in the dataset


From   Alice Guerra <[email protected]>
To   [email protected]
Subject   st: Add new observations in the dataset
Date   Fri, 19 Jul 2013 11:25:52 +0200

Dear Statalists,

I have a panel dataset that looks as follows:

year city x1
2008 Ancona 5
2008 Bari 1

2009 Ancona 8
2009 Bari 3

2010 Ancona 9
2010 Bari 8

I would like to add for each year a new observation "Italy" whose x1'
values are the sum of the x1's values of Italian cities:

year city x1
2008 Ancona 5
2008 Bari 1
2008 ITALY 6

2009 Ancona 8
2009 Bari 3
2009 ITALY 11

2010 Ancona 9
2010 Bari 8
2010 ITALY 17

Is there a direct way to obtain this result or I have to use collapse,
save the dta with only Italy, and append it to the complete dta?

Thank you fot your time and assistance

Best regards

Alice
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