pandas.stats.moments.rolling_count¶
- pandas.stats.moments.rolling_count(arg, window, freq=None, center=False, how=None)¶
Rolling count of number of non-NaN observations inside provided window.
Parameters : arg : DataFrame or numpy ndarray-like
window : int
Size of the moving window. This is the number of observations used for calculating the statistic.
freq : string or DateOffset object, optional (default None)
Frequency to conform the data to before computing the statistic. Specified as a frequency string or DateOffset object.
center : boolean, default False
Whether the label should correspond with center of window
how : string, default ‘mean’
Method for down- or re-sampling
Returns : rolling_count : type of caller
Notes
The freq keyword is used to conform time series data to a specified frequency by resampling the data. This is done with the default parameters of resample() (i.e. using the mean).