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### Functions to calculate the sample skewness and kurtosis
### Taken from the package e1071
skewness <- function (x, na.rm = FALSE){
if (na.rm) {
x <- x[!is.na(x)]
}
sum((x - mean(x))^3)/(length(x)*sd(x)^3)
}
kurtosis <- function (x, na.rm = FALSE){
if (na.rm) {
x <- x[!is.na(x)]
}
sum((x - mean(x))^4)/(length(x)*var(x)^2) - 3
}
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