f
by()
Calculate the skewness for each column in the frame.
Frame
The frame will have one row and the same number/names of columns as in the current frame. All the columns will have float64 stype. For non-numeric columns this function returns NA values.
float64
.skew1() – similar to this method, but operates on a single-column frame only, and returns a scalar value instead of a Frame.
.skew1()