> a <- c(179,160,136,227) > sd(a) [1] 38.57892 > sqrt(sum((a-mean(a))^2/(length(a)-1))) [1] 38.57892. ```. ... <看更多>

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Try this. R> sd(c(2,4,4,4,5,5,7,9)) * sqrt(7/8) [1] 2 R>. and see the rest of the Wikipedia article for the discussion about estimation of ... ... <看更多>

Population variance and standard deviation in R. GitHub Gist: instantly share code, notes, and snippets. ... <看更多>

Why don't we use the built-in sd() function? The reason for this is that this function computes the sample standard deviation, by dividing by n ... ... <看更多>