Standard deviation
(self, ddof=0)
| 1143 | ) |
| 1144 | |
| 1145 | def std(self, ddof=0): |
| 1146 | """Standard deviation""" |
| 1147 | return self.var(ddof=ddof).apply(math.sqrt) |
| 1148 | |
| 1149 | def join(self, other, on_self, on_other=None): |
| 1150 | """Joins collection with another collection. |