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# pandas.stats.moments.rolling_apply

`pandas.stats.moments.``rolling_apply`(arg, window, func, min_periods=None, freq=None, center=False, time_rule=None)

  Generic moving function application

  Parameters : | arg : Series, DataFrame window : Number of observations used for calculating statistic func : function Must produce a single value from an ndarray input min_periods : int Minimum number of observations in window required to have a value 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 : | y : type of input argument

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