Displaying 4 results from an estimated 4 matches for "zelazo".
2006 Feb 19
2
changing names of vectors in list or data.frame
When I combine separate vectors into one list, there are new names
created. I'd like to change them to something more meaningful.
Here are two examples using data(zelazo) from library(ISwR):
> library(ISwR)
> data(zelazo)
> attach(zelazo)
> zelazo
$active
[1] 9.00 9.50 9.75 10.00 13.00 9.50
$passive
[1] 11.00 10.00 10.00 11.75 10.50 15.00
$none
[1] 11.50 12.00 9.00 11.50 13.25 13.00
$ctr.8w
[1] 13.25 11.50 12.00 13.50 11.50
> walk <-...
2006 Nov 21
1
NEWBIE: Help explaining use of lm()?
...t the same time. I'm working through Peter Dalgaard's
Introductory Statistics with R, but don't understand why the answer to
one of the exercises works. I'm hoping someone will have the patience to
explain the answer to me, both in the statistics and R areas.
Exercise 6.1 says:
The zelazo data are in the form of a list of vectors, one for each of
the four groups. Convert the data to a form suitable for the use of lm,
and calculate the relevant tests. ...
This stumped me right from the beginning. I thought I understood that
linear models tried to correlate an independent variable (s...
2006 Feb 20
2
glob2rx function not working
Dear R users,
Inspired by previous list discussion of the glob2rxc function, I am
attempting to create a new vector called TOTAL by summing all vectors
whose names begin with ABC:
TOTAL = sum(list = ls(pattern = glob2rx("ABC*")))
I'm running R 2.2.1 on Windows XP. Can anyone say what I'm missing?
Thank you, Mark
2003 Mar 06
2
anova subhypotheses
Hello all,
A really noddy question for you all: I''m trying without success to do some subhypothesis testing. Using simple anova model, with a toy dataset from a book. I have four factors A,B,C,D, and wish to test mu_C = mu_D. This is what I have tried:
> contrasts(infants$group,how.many=1) <- c(0,0,1,-1)
> contrasts(infants$group)
[,1]
A 0
B 0
C 1