http://r-bugs.biostat.ku.dk/cgi-bin/R/Accuracy?id=1228;user=guest
which seems to have been improved in recent versions.
Andreas Pauling <[EMAIL PROTECTED]> 3/29/2004 9:01:40 AM >>>
Dear R people
I came across a strange thing:
sd(rep(0.01, 15)) #0 sd(rep(0.001, 15)) #4.489023e-19 sd(rep(0.00001, 15)) #0 sd(rep(0.00000001,15)) #1.712427e-24
sd(rep(0.01, 13)) #1.805557e-18 sd(rep(0.001, 13)) #4.513894e-19 sd(rep(0.00001, 13)) #0 sd(rep(0.00000001,13)) #0
sd(rep(5.01, 15)) #0 sd(rep(5.001, 15)) #4.489023e-19 sd(rep(5.00001, 15)) #1.838704e-15 sd(rep(5.00000001,15)) #9.19352e-16
sd(rep(5.01, 13)) #9.244454e-16 sd(rep(5.001, 13)) #9.244454e-16 sd(rep(5.00001, 13)) #1.848891e-15 sd(rep(5.00000001,13)) #0
Why gives sd sometimes zero and sometimes values close to zero and why does it depend on the value and on how many times it is repeated? Shouldn't it give always zero? Is there a way to control this? ...
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