From: Marc Schwartz <marc_schwartz_at_comcast.net>

Date: Mon 29 Jan 2007 - 18:24:08 GMT

R-help@stat.math.ethz.ch mailing list

https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Tue Jan 30 05:47:36 2007

Date: Mon 29 Jan 2007 - 18:24:08 GMT

Or, to throw yet another couple of possibilities into the mix:

lapply(split(YourDF, YourDF$country),

function(x) summary(lm(y ~ x, data = x))

library(nlme)

summary(lmList(y ~ x | country, YourDF))

See ?split and help(lmList, package = nlme)

On Mon, 2007-01-29 at 09:03 -0800, Bert Gunter wrote:

> Prior answers are certainly correct, but this is where lists and lapply

*> shine:
**>
**> result<-lapply(list(UK,USA),function(z)summary(lm(y~x,data=z)))
**>
**> As in (nearly) all else, simplicity is a virtue.
**>
**> If you prefer to keep the data sources as a character vector,dataNames,
**>
**> result<-lapply(dataNames,function(z)summary(lm(y~x,data=get(z))))
**>
**> should work.
**>
**> Note: both of these are untested for the general case where they might be
**> used within a function and may not find the right z unless you pay attention
**> to scope, especially in the get() construction.
**>
**>
**> Bert Gunter
**> Genentech Nonclinical Statistics
**> South San Francisco, CA 94404
**>
**>
**> -----Original Message-----
**> From: r-help-bounces@stat.math.ethz.ch
**> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of C.Rosa@lse.ac.uk
**> Sent: Monday, January 29, 2007 8:23 AM
**> To: liuwensui@gmail.com; bcarvalh@jhsph.edu; Roger.Bivand@nhh.no
**> Cc: r-help@stat.math.ethz.ch
**> Subject: Re: [R] Loop with string variable AND customizable "summary" output
**>
**> Dear All,
**> Thank you very much for your help!
**> Carlo
**>
**> -----Original Message-----
**> From: Wensui Liu [mailto:liuwensui@gmail.com]
**> Sent: Mon 29/01/2007 15:39
**> To: Rosa,C
**> Cc: r-help@stat.math.ethz.ch
**> Subject: Re: [R] Loop with string variable AND customizable "summary" output
**>
**> Carlo,
**>
**> try something like:
**>
**> for (i in c("UK","USA"))
**> {
**> summ<-summary(lm(y ~ x), subset = (country = i))
**> assign(paste('output', i, sep = ''), summ);
**> }
**>
**> (note: it is untested, sorry).
**>
**> On 1/29/07, C.Rosa@lse.ac.uk <C.Rosa@lse.ac.uk> wrote:
**> > Dear All,
**> >
**> > I am using R for my research and I have two questions about it:
**> >
**> > 1) is it possible to create a loop using a string, instead of a numeric
**> vector? I have in mind a specific problem:
**> >
**> > Suppose you have 2 countries: UK, and USA, one dependent (y) and one
**> independent variable (y) for each country (vale a dire: yUK, xUK, yUSA,
**> xUSA) and you want to run automatically the following regressions:
**> >
**> >
**> >
**> > for (i in c("UK","USA"))
**> >
**> > output{i}<-summary(lm(y{i} ~ x{i}))
**> >
**> >
**> >
**> > In other words, at the end I would like to have two objects as output:
**> "outputUK" and "outputUSA", which contain respectively the results of the
**> first and second regression (yUK on xUK and yUSA on xUSA).
**> >
**> >
**> >
**> > 2) in STATA there is a very nice code ("outreg") to display nicely (and as
**> the user wants to) your regression results.
**> >
**> > Is there anything similar in R / R contributed packages? More precisely, I
**> am thinking of something that is close in spirit to "summary" but it is also
**> customizable. For example, suppose you want different Signif. codes: 0
**> '***' 0.001 '**' 0.01 '*' 0.05 '.' 0.1 ' ' 1 or a different format display
**> (i.e. without "t value" column) implemented automatically (without manually
**> editing it every time).
**> >
**> > In alternative, if I was able to see it, I could modify the source code of
**> the function "summary", but I am not able to see its (line by line) code.
**> Any idea?
**> >
**> > Or may be a customizable regression output already exists?
**> >
**> > Thanks really a lot!
**> >
**> > Carlo
**> >
*

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