Standard deviation
(self, ddof=0)
| 1145 | ) |
| 1146 | |
| 1147 | def std(self, ddof=0): |
| 1148 | """Standard deviation""" |
| 1149 | return self.var(ddof=ddof).apply(math.sqrt) |
| 1150 | |
| 1151 | def join(self, other, on_self, on_other=None): |
| 1152 | """Joins collection with another collection. |