[R] Newbie questions

Thomas Lumley thomas at biostat.washington.edu
Tue Oct 31 20:53:55 CET 2000

On Tue, 31 Oct 2000, Zsombor Cseres-Gergely wrote:

> > programming language. 
> But should this affect memory usage when using more than data frame? As far I
> have experienced, the memory need (for loading the data) of Stata is about the
> size of the file on disk, but R consumes more that twice that. This shuld not
> be connected to the language or the ability to accept more datasets, but the
> representation of the data, should it?

It is due to the representation of the data, but not due to
object-orientedness, which R has only to a limited extent

> > library(ctest) is in the main R distribution. It has a lot of classical
> > hypothesis tests.
> Well, I was not that precise, since I meant tests for regression parameters.
> Now I have seen from the code of ellipse(), that one can extract the varcovar
> matrix of the extimators as summarl.lm$cov.unscaled, and than the calculations
> are straightforward (at least for simple tests). But I still wonder if there
> is no library for this, since (ctest) does not do this, AFAIK.

summary() gives tests for individual regression parameters in a linear
model and anova() compares two models.


Thomas Lumley
Assistant Professor, Biostatistics
University of Washington, Seattle

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