pandas.stats.moments.expanding_count¶
- pandas.stats.moments.expanding_count(arg, freq=None, center=False, time_rule=None)¶
Expanding count of number of non-NaN observations.
Parameters : arg : DataFrame or numpy ndarray-like
freq : None or string alias / date offset object, default=None
Frequency to conform to before computing statistic
center : boolean, default False
Whether the label should correspond with center of window
time_rule : Legacy alias for freq
Returns : expanding_count : type of caller