search for: quantpsyc

Hi, I tried to install packages for R, but it did not work. I looked for a hint on the R website, but could not find anything. I tried the following commands: install.packages("psych") install.packages("QuantPsyc") install.packages("car") install.packages("Hmisc") install.packages("foreign") install.packages("Rcmdr") The following appeared on my console: > install.packages("psych") Warnung in install.packages("psych") : '...

Hi folks, I have a dataframe df.vars with the follwing structure: var1 var2 var3 group Group is a factor. Now I want to standardize the vars 1-3 (actually - there are many more) by class, so I define z.mean.sd <- function(data){ return.values <- (data - mean(data)) / (sd(data)) return(return.values) } now I can call for each var z.var1 <- by(df.vars$var1, group,

...to do a regression analysis (multiple linear regression) and have to deal with a slight heteroscedascitiy in my data. I've read somewhere that it's possible to use the rlm (robust regression) out of the MASS package in such cases. Is it possible to apply the lm.beta method (from package QuantPsyc) to the returned rlm object and/or is there a way to calculate r-squared (or a "robust" equivalent) for each parameter? Thanks a lot in advance. rob

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Hi, Is there a function in R to calculate the coefficient of skewness of some data? I had expected there to be one, but can find no information about it. Thanks for any pointers. Robin Williams Met Office summer intern - Health Forecasting robin.williams@metoffice.gov.uk [[alternative HTML version deleted]]