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

Roger Bivand Roger.Bivand at nhh.no
Mon Jan 29 16:31:01 CET 2007

On Mon, 29 Jan 2007 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).

The input data could be reshaped as y, x, country, and subset= used in the 
lm() call. To assign to named objects see assign(), but consider using a 
named list instead, assigning to a list of the required length in turn, 
and giving the names from the defining vector. Then you'd get output$UK, 

> 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?

Use a custom function on the output object from using the summary() method 
on the lm object (that is on the summary.lm object). Use str() to look at 
the summary.lm object to see what you want.

> Or may be a customizable regression output already exists?
> Thanks really a lot!
> Carlo
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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

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