Ron Michael <ron_michael70 at yahoo.com> writes: > Can anyone tell me why I am getting different results in calculating > SD of 2 numbers ? > >> (1.25-0.95)/2 > [1] 0.15 Because this is not the SD? Try > (1.25-0.95)/sqrt(2) :-) >> sd(c(1.25, 0.95)) > [1] 0.2121320 # why it is different from 0.15? -- Bjørn-Helge Mevik