st: Need help: Problems with tsset

["risti permani" <risti_permani@hotmail.com>]

Dear All,

This might be a simple problem for those who are familiar with STATA, but it 
really makes me confused.

so, I have panel data
the period is in 5 year interval - across countries.
and I need to tsset the data before using xtabond and xtivreg fd
the format of my data are something like this:

isocode      yr      income
1           1965      1230
1           1970      1450
:
:
1           2000      3670
2           1965      2345
2           1970      3400
:
:

so how to tsset the data
I've tried to do this:

tsset isocode yr

then it appears on the result box:

      panel variable:  isocode, 1 to 18
       time variable:  yr, 1965 to 2000, but with gaps

then, I put command for xtivreg
but then the result is "no observation"

so my QUESTION: what command should I put to state 5 year interval and make 
it work?

I really appreciate for your help and comments

Risti Permani

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