I'm trying to figure out R, a piece at a time, hours at a time...  I 
was trying to copy the sample function in, "An Introduction to R"  (for 
version 2.1.0) by W. N. Venables, D. M. Smith, page 42.  Section 10.1 
"Simple examples" provides a sample function which I tried to duplicate 
(I'm using Mac OS X 10.3.9, and "R for Mac OS X Aqua GUI v1.11).  The 
following is what I typed and the last line is R's response when I hit 
the return key after the penultimate line.  I've re-checked and 
re-typed the code many times to no avail.  I wasn't able to find this 
issue using search options, either.  Any help is GREATLY appreciated!

 > twosam<-function(y1, y2) {
+ n1<-length(y1);n2 <-length(y2)
+ yb1<-mean(y1); yb2<-mean(y2)
+ s1<-var(y1);s2<-var(y2)
+ s<-((n1-1)*s1 + (n2-1)*s2)/(n1+n2-2)
+ tst<-(yb1-yb2)/sqrt(s*(1/n1+1/n2))
Error: syntax error

David
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