[R] proper work-flow with 'formula' objects and lm()
Prof Brian Ripley
ripley at stats.ox.ac.uk
Thu Nov 24 22:25:33 CET 2011
On Thu, 24 Nov 2011, Liviu Andronic wrote:
> On Thu, Nov 24, 2011 at 9:14 PM, Duncan Murdoch
> <murdoch.duncan at gmail.com> wrote:
>> It is retained. terms(fit) will give it to you, if fit is an lm object.
> Thank you. The following works nicely.
>> (form <- formula(y1~x1))
> y1 ~ x1
>> x <- lm(form, anscombe)
> y1 ~ x1
> However, I was hoping that there was a way to input the 'form' object
> so that summary(x) would print the underlying formula used, not the
> formula object name. I was thinking of something in the style of
> x <- lm(deparse(form), anscombe)
> Can this be done? Regards
Yes. That's a job for substitute (the second time today).
> form <- formula(y1~x1)
> x <- eval(substitute(lm(f, anscombe), list(f = form)))
lm(formula = y1 ~ x1, data = anscombe)
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Brian D. Ripley, ripley at stats.ox.ac.uk
Professor of Applied Statistics, http://www.stats.ox.ac.uk/~ripley/
University of Oxford, Tel: +44 1865 272861 (self)
1 South Parks Road, +44 1865 272866 (PA)
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