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bicoid
2010 Apr 08
1
reshape panel data
...that year and 0
otherwise. How do I assign a zero to a city when it does not have an
observation for that year?
For example. Suppose I have the following data set. The observation range
over three years 1990-1992. But some cities did not report in some years.
The original data looks like this:
Cicoid year other_variables seclection-variable
1 1990 x x x x x x x 1
1 1991 xxxxxxxxxx 1
2 1991 xxxxxxxxxx 1
3 1990 xxxxxxxxxx...