On 3/6/2008 2:07 PM, Martin Kaffanke wrote:
> Am Mittwoch, den 05.03.2008, 14:38 -0300 schrieb Henrique Dallazuanna:
>> Try this:
>>
>> On 05/03/2008, Martin Kaffanke <[EMAIL PROTECTED]> wrote:
>>> Hi there!
>>>
>>> In my case,
>>>
>>> cor(d[1:20])
>>>
>>> makes me a good correlation matrix.
>>>
>>> Now I'd like to have it one sided, means only the left bottom side to be
>>> printed (the others are the same) and I'd like to have * where the
>>> p-value is lower than 0.05 and ** lower than 0.01.
>>>
>>> How can I do this?
>> d <- matrix(rexp(16, 2), 4)
>> corr <- cor(d)
>> sign <- symnum(cor(d), cutpoints=c(0.05, 0.01), corr = T,
>> symbols=c("***", "**", "*"), abbr=T, diag=F)
>>
>> noquote(mapply(function(x, y)paste(x, format(y, dig=3), sep=''),
>> as.data.frame(unclass(sign)), as.data.frame(corr)))
>
> Seems that we mark the value itself, but not the p-value.
>
> So lets say, in a way I have to get the lower left half of a
>
> cor(el[1:20])
>
> Then I need to calc all the values with a cor.test() to see for the
> p-value. And the p-value should be lower than .05 or .01 -> this should
> make the * to the value.
>
> Thanks,
> Martin
Do you want something like the following, but with the upper triangle
removed?
corstars <- function(x){
require(Hmisc)
x <- as.matrix(x)
R <- rcorr(x)$r
p <- rcorr(x)$P
mystars <- ifelse(p < .01, "**|", ifelse(p < .05, "* |", " |"))
R <- format(round(cbind(rep(-1.111, ncol(x)), R), 3))[,-1]
Rnew <- matrix(paste(R, mystars, sep=""), ncol=ncol(x))
diag(Rnew) <- paste(diag(R), " |", sep="")
rownames(Rnew) <- colnames(x)
colnames(Rnew) <- paste(colnames(x), "|", sep="")
Rnew <- as.data.frame(Rnew)
return(Rnew)
}
corstars(swiss[,1:4])
Fertility| Agriculture| Examination| Education|
Fertility 1.000 | 0.353* | -0.646**| -0.664**|
Agriculture 0.353* | 1.000 | -0.687**| -0.640**|
Examination -0.646**| -0.687**| 1.000 | 0.698**|
Education -0.664**| -0.640**| 0.698**| 1.000 |
I will leave the removing the upper triangle part to you - should be
examples in the archives.
> ------------------------------------------------------------------------
>
> ______________________________________________
> R-help@r-project.org mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
--
Chuck Cleland, Ph.D.
NDRI, Inc.
71 West 23rd Street, 8th floor
New York, NY 10010
tel: (212) 845-4495 (Tu, Th)
tel: (732) 512-0171 (M, W, F)
fax: (917) 438-0894
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
