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2013 Apr 17
3
t-statistic for independent samples
...degrees of freedom in order to
make the distribution a t-distribution. However, most texts give no
information why you have to do this.
So I thought I try a little experiment which is outlined here.
Distrubtion of differences of independent samples
<http://msemac.redwoods.edu/~darnold/math15/R/chapter11/DistributionForTwoIndependentSamplesPartII.html>
As you can see in the above link, I see no evidence why you need a pooled or
Welch's in these images.
Anyone care to comment? Or should I put this on Stack Exchange?
D.
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2008 Jan 24
0
readClipboard() from spreadsheet to data.frame with column names?
...inking this.
I tried read.DIF to read the clipboard but that didn't work as I had hoped.
writeClipboard(rownames(state.x77), format=1)
#A paste, Ctrl+V in any Application should now list United States State
names.
statex77 <- cbind(State=rownames(state.x77), state.x77)
wd <- "b:/Chapter11/"
setwd(wd) #Note use of "/" rather than "\"
write.csv(statex77, file="StateX77.csv", row.names=FALSE)
getwd()
StateX77CSV <- paste(wd,"StateX77.csv",sep="")
shell(StateX77CSV) #Might open Excel rather than QP
#data.entry(statex77)...