[R] trying to build matrix for tests...
Jonathan Rougier
J.C.Rougier at durham.ac.uk
Fri Mar 1 09:54:13 CET 2002
Hi Jeff,
I think this is what you want ...
> resid <- rnorm(30) # some residuals
> signif <- symnum(resid, corr = FALSE, na = FALSE,
cutpoints = c(-5,.1,.2,.3,.4, 5), symbols = LETTERS[1:5])
> rt <- data.frame(resid, signif = ordered(signif, levels = LETTERS[1:5]))
> boxplot(resid ~ signif, data = rt)
If you want to include the result from symnum directly into a dataframe
then you could use the I() function, ie as
> rt <- data.frame(resid, signif = I(signif))
but the boxplot won't work in this case.
Cheers, Jonathan.
"Jeff D. Hamann" wrote:
>
> Okay, I stumped. I'm trying to build a matrix or data.frame that consists of
> values by group. For example,
>
> resid, group
>
> 574 0.536196370873122 E
> 575 0.93191093696265 E
> 576 -1.27116094894117 A
> 577 -1.05159666055027 A
> 578 0.398273458301184 D
> 579 0.586373126102573 E
> 580 0.806575304513802 E
> 581 0.897258393118338 E
> 582 0.342393324256838 D
> 583 0.781245511773227 E
>
> I can get the values without the quotes, but when I try to use the matrix I
> get errors like,
>
> Error in "colnames<-"(*tmp*, value = c("resid", "group")) :
> attempt to set an attribute on NULL
>
> and
>
> > attach( rt )
> Error in attach(rt) : attach only works for lists and data frames
>
> the code that I use to build the matrix is :
>
> # break up the classes into cats and test for departure from zero
> signif <- symnum(fit3sls[[2]]$residuals,
> corr = FALSE,
> na = FALSE,
> cutpoints = c(-5,.1,.2,.3,.4, 5),
> symbols = c("A","B","C","D","E"))
>
> rt <- noquote( cbind( fit3sls[[2]]$residuals, signif ) )
> colnames(table) <- c("resid","group")
>
> boxplot( resid ~ signif, data = rt )
>
> which doesn't work. What do I need to do when building the matrix to make it
> usable as a data set.
>
> Thanks,
> jeff.
>
> Jeff D. Hamann
> Hamann, Donald & Associates, Inc.
> PO Box 1421
> Corvallis, Oregon USA 97339-1421
> Bus. 541-753-7333
> Cell. 541-740-5988
> jeff_hamann at hamanndonald.com
> www.hamanndonald.com
>
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