Just so you don't feel that you are alone.... I get the same response as you use R1.8.0 on an XP operating system. Alex
-----Original Message----- From: Andreas Pauling [mailto:[EMAIL PROTECTED] Sent: March 29, 2004 10:02 AM To: [EMAIL PROTECTED] Subject: [R] strange thing with sd 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? I use R Version 1.8.1 under UNIX. Thanks for any suggestions!! Andreas ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
