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I have two questions regarding the R script.

If I want to know the size of the sampling when I do a t-test with R, I can use this R script :

power.t.test(delta=1,sd=1.5,sig.level=0.05,power=0.8)

If I want to know the size of the sampling when I do the test of Pearson correlation coefficient, what is the R script?

And for a chi-square test what is the R script?

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    $\begingroup$ You can look at the pwr package for one approach to these problems. $\endgroup$ – Gala Jul 4 '13 at 19:03
  • $\begingroup$ The question could be migrated to SO, it has already received a full answer anyway. $\endgroup$ – Gala Jul 5 '13 at 7:10
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For correlation:

pwr.r.test(n = , r = , sig.level = , power = )

and for chi-square

pwr.chisq.test(w =, N = , df = , sig.level =, power = )

For others, see here

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