[R] Same regression per sub-group: apply?

[Gabor Grothendieck]

See:

https://stat.ethz.ch/pipermail/r-help/2007-May/132866.html

On Dec 7, 2007 3:32 AM, Rense Nieuwenhuis <r.nieuwenhuis at student.ru.nl> wrote:
> Dear helpers,
>
> I've come up with what is probably a simple problem, but I cannot
> find the solution. I have a data-set containing survey-data from
> several countries. What I want to do is to perform some regression
> analyses, for each country separately. The question is, how to do
> this nicely (thus without repeating the same syntax with another
> `subset' argument).
>
> I thought of the following:
>
> model.per.country <- tapply(data, data$COUNTRY, function(x) glm
> (dependent.var ~ FEMALE + AGE + EDUCLIN + (), family=binomial,
> data=capital))
>
> But this does not work. What goes wrong, I think, is that the
> dependent variable is clustered according to `Country', but not so
> for the predictors. The error message I received:
>
> Error in tapply(dat, dat$COUNTRY, function(x) glm(participate ~
> FEMALE +  :
>        arguments must have same length
>  >
>
>
> Could you please help me solving this little problem?
>
> Thanks in advance:
>
> Rense Nieuwenhuis
>
>
>
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>
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