Hello everyone,

I'm a beginner on R, and I recently met a paragraph of code that I don't
quite understand, anyone could nicely offer me some detailed explanation on
it? Many thanks, and I'll wait on-line. Here is the code:

postscript("SPreturns_tplot.ps",width=6,height=5)  # Figure 19.2
par(mfrow=c(1,1))
qqplot(SPreturn, qt(grid,df=2.9837),main="t-probability plot,
df=2.9837",xlab="data",ylab="t-quantiles")
abline(lm(qt(c(.25,.75),df=2.9837)~quantile(SPreturn,c(.25,.75))))
graphics.off()

I suppose this to be a plotting process, however, after I run it in
RStudio, there is no response like plotting, so I can't figure out what
exactly is this code telling about.

Thanks again!

	[[alternative HTML version deleted]]

