[R] Loop with string variable AND customizable "summary" output

[Wensui Liu]

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 at lse.ac.uk <C.Rosa at 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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-- 
WenSui Liu
A lousy statistician who happens to know a little programming
(http://spaces.msn.com/statcompute/blog)