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dplyr mutate standard deviation
MF
on Aug 07, 2020
library(dplyr)
library(matrixStats)
nm1 <- c('hp', 'drat', 'wt')
res1 <- mtcars %>%
mutate(Mean= rowMeans(.[nm1]), stdev=rowSds(as.matrix(.[nm1])))
head(res1,3)
# mpg cyl disp hp drat wt qsec vs am gear carb Mean stdev
#1 21.0 6 160 110 3.90 2.620 16.46 0 1 4 4 38.84000 61.62969
#2 21.0 6 160 110 3.90 2.875 17.02 0 1 4 4 38.92500 61.55489
#3 22.8 4 108 93 3.85 2.320 18.61 1 1 4 1 33.05667 51.91809Source: stackoverflow.com
dplyr mutate standard deviation
MF
on Aug 07, 2020
mtcars = mutate(mtcars, mean=(hp+drat+wt)/3, stdev = sd(hp,drat,wt))Source: stackoverflow.com
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