[R] trying to build matrix for tests...

[Jeff D. Hamann]

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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