[R-sig-Geo] Variables inside a for

[Roger Bivand]

On Mon, 1 Dec 2008, Gabor Grothendieck wrote:

> Use this:
>
> lm(database[c(variable[i], "INCOME")])
>
> On Mon, Dec 1, 2008 at 7:45 PM, Raphael Saldanha
> <saldanha.plangeo at gmail.com> wrote:
>> Hi!
>>
>> I had a database with some variables in sequence. Let me say: TX01, TX02,
>> TX03 and TX04.
>>
>> But I need to run some regressions changing the variables... so:
>>
>> variable <- paste("TX0", 1:4, sep="")

Or:

lm(as.formula(paste(variable[i], "~ INCOME")), data=database)

as in:

lm(as.formula("dist ~ speed"), data=cars)

Please never cross-post. This should either go to r-help or r-sig-geo, not 
both!! Most r-help subscribers are not subscribed to r-sig-geo, so get a 
post rejection if they reply. In addition, the topic is really an r-help 
question.

Roger

>>
>> for(i in 1:4){
>> test[i] <- lm(variable[i] ~ INCOME, data=database)
>> }
>>
>> But doesn't work... lm tries to find a variable inside database named
>> variable[i] ...
>>
>> Suggestions?
>>
>>
>> King regards!
>>
>> Raphael Saldanha
>> Brasil
>>
>>        [[alternative HTML version deleted]]
>>
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>
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-- 
Roger Bivand
Economic Geography Section, Department of Economics, Norwegian School of
Economics and Business Administration, Helleveien 30, N-5045 Bergen,
Norway. voice: +47 55 95 93 55; fax +47 55 95 95 43
e-mail: Roger.Bivand at nhh.no