Calculate the standard deviation for a one-column frame and
return it as a scalar.
This function is a shortcut for:
Parameters
None
is returned for non-numeric columns.
If called on a Frame that has more or less than one column.
See Also
.sd()
– similar to this method, but can be applied to
a Frame with an arbitrary number of columns.
dt.sd()
– function for calculating the standard deviation
in a column or an expression; can also be applied per-group.