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ranamahmud/2. sd() R Programming Bangla - Md Rana Mahmud.R

Created September 15, 2018 02:37
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2. sd() R Programming Bangla - Md Rana Mahmud.R
Md Rana Mahmud
July 1, 2018
x <- c(1,2,3,4,5,6,7,8,9,10)
sd(x)
## [1] 3.02765
data(iris)
names(iris)
## [1] "Sepal.Length" "Sepal.Width" "Petal.Length" "Petal.Width"
## [5] "Species"
sd(iris$Sepal.Length)
## [1] 0.8280661
x.miss <- c(1,2,3,NA,5,6,NA,7,NA,9,10)
sd(x.miss)
## [1] NA
sd(x.miss, na.rm = TRUE)
## [1] 3.248626
sd(iris$Sepal.Length)^2
## [1] 0.6856935
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