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From |
"Nirina M." <[email protected]> |

To |
[email protected] |

Subject |
st: Re:Paneldata: how to deal with varbles existing in 98 but not in 99(+more question!!!) |

Date |
Tue, 6 Dec 2005 19:53:23 -0800 (PST) |

Dear Friends, thank you very much. I have not tried what Stas suggested yet because I still haven't defined my panelid (I am still doing some data cleaning but I ask my question ahead of time). I mean variables not observations. But now that you are talking about obs, I have another question: when I create the panel, I assign an id to each individual, but as we move through years, the number of obs decreases so I cannot assign the same panelid so how do we treat the missing observation? Thanks for your help Feno --- Rose Medeiros <[email protected]> wrote: > 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 you > >>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. > >> > >> > > > >Nirina M. > > > > > > > >>>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. > >>> > >>> > > > >* > >* For searches and help try: > >* > http://www.stata.com/support/faqs/res/findit.html > >* http://www.stata.com/support/statalist/faq > >* http://www.ats.ucla.edu/stat/stata/ > > > > > > > > * > * For searches and help try: > * > http://www.stata.com/support/faqs/res/findit.html > * http://www.stata.com/support/statalist/faq > * http://www.ats.ucla.edu/stat/stata/ > __________________________________________ Yahoo! DSL � Something to write home about. Just $16.99/mo. or less. dsl.yahoo.com * * For searches and help try: * http://www.stata.com/support/faqs/res/findit.html * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/

**Follow-Ups**:**st: Endogeneity test***From:*Trevor Dave <[email protected]>

**References**:**Re: st: Panel data: how to deal with varbles existing in 98 but notin 99***From:*Rose Medeiros <[email protected]>

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