Displaying 4 results from an estimated 4 matches for "atropin75".
2004 Feb 05
5
(Novice-) Problem with the plot-function
Hello,
i have written this little function to draw different normal distributions:
n.Plot <- function(x,my,sigma) {
e <- exp(1)
names(x) <- x
f.x <- (1/(sigma*sqrt(2*pi)))*e^(-1*(((x-my)^2)/2*(sigma^2)))
plot(f.x,type="l",xlim=c(-5,5))
return(f.x)
}
if i define x like this:
x <- seq(-5,5,0.01)
Now
n.Plot(x,0,1)
DOES draw the correct plot, but the x-axis is labeled
2004 May 08
3
Getting the groupmean for each person
Hello list !
I have a huge data.frame with several variables observed on about 3000
persons. For every person (row) there is variable called GROUP which indices
the group the person belongs to. There is also another variable AV for each
person. Now i want to create a new variable which holds the group mean of AV
as a value for each person.
With tapply(AV,GROUP,mean) i get the means for each
2004 May 15
1
Again some questions about multilevelanalysis
Dear list,
I asked some questions about multilevelanalysis a couple of months ago. In the
meantime I did some reading about the subject. Now I'd like to check, if I
understood it all correctly. If you think my questions are not appropriate
for this list, please tell me so and i will immediatly stop asking them.
I have a dataset with one predicted variable (y), two explanatory variables
2004 Mar 21
1
Multilevel analysis with package lme
Dear list,
i am a student of psychology and have to do a multilevelanalysis on some data.
About that i have one general and one specific question.
This is what i have copied from the help-file on lme:
data(bdf)
fm <- lme(langPOST ~ IQ.ver.cen + avg.IQ.ver.cen, data = bdf,
random = ~ IQ.ver.cen | schoolNR)
summary(fm)
after summary(fm) i get the following error: