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From |
Rose Medeiros <[email protected]> |

To |
[email protected] |

Subject |
Re: st: Panel data: how to deal with varbles existing in 98 but notin 99 |

Date |
Tue, 06 Dec 2005 14:06:19 -0500 |

To me at least, the author seems to mean "variables" rather than "observations." Since she states that questions were asked at one wave, but not at the others. Her example, religion, is often presumed to be time invariant (i.e. people don't change their religions often), so it would make sense that it would only be asked at one point. It might be useful to know whether the "problem" variables are all of this sort or not.

Rose

Nick Cox wrote:

This answer takes Nirina to mean "observations"

when she says "variables". I did wonder this myself, but it is not what she said.

Nick [email protected]

Stas Kolenikov

Depends on what you want to do with them. You can -drop- them, or youNirina M.

can fill them in by

sort panelid time

unab allvars : *

foreach x in varlist `allvars' {

bysort panelid (time): replace x=x[_n-1] if mi(x)

}

This may lead to some awkward results, and sometimes the missing value

is a valid one (e.g. a wage of somebody who was employed in the first

period, but not in the second one), so if you know the variables you

want to fill in by the prior values, you should put them as the

varlist in -foreach- above.

*my question should be very easy but forgive my

d..ness.

I am creating a panel data but the trouble now is that

there are variables that exist in the start of the

survey but does not exist in the following year:(or

sometimes new questions come up in the following year

but were not asked before): say the religion, they ask

it in 98 but not later.

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