1Function Description
2count : Number of non-null observations
3sum : Sum of values
4mean : Mean of values
5mad : Mean absolute deviation
6min : Minimum
7max : Maximum
8mode : Mode
9abs : Absolute Value
10prod : Product of values
11std : Unbiased standard deviation
12var : Unbiased variance
13sem : Unbiased standard error of the mean
14skew : Unbiased skewness (3rd moment)
15kurt : Unbiased kurtosis (4th moment)
16quantile : Sample quantile (value at %)
17cumsum : Cumulative sum
18cumprod : Cumulative product
19cummax : Cumulative maximum
20cummin : Cumulative minimum