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

From: <C.Rosa_at_lse.ac.uk>
Date: Mon 29 Jan 2007 - 15:06:01 GMT


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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