Not finding function ewma in pandas module

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In the following code snippet,  I get the error: pandas does not have the attribute ewma. I can see it the documentation. Any ideas?

import pandas as pd

class BetaAlgorithm(QCAlgorithm):
    def Initialize(self):
         ....

    def Rebalance(self):

        # Fetch the historical data to perform the linear regression
        history = self.History(
            self.symbols, 
            self.lookback,
            Resolution.Daily).close.unstack(level=0)
            

        prices = pd.ewma(history, span = self.lookback).as_matrix(self.symbols)
        

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Hello. Please Try 

prices = pd.DataFrame.ewm(history, span = self.lookback).as_matrix(self.symbols)

 

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The material on this website is provided for informational purposes only and does not constitute an offer to sell, a solicitation to buy, or a recommendation or endorsement for any security or strategy, nor does it constitute an offer to provide investment advisory services by QuantConnect. In addition, the material offers no opinion with respect to the suitability of any security or specific investment. QuantConnect makes no guarantees as to the accuracy or completeness of the views expressed in the website. The views are subject to change, and may have become unreliable for various reasons, including changes in market conditions or economic circumstances. All investments involve risk, including loss of principal. You should consult with an investment professional before making any investment decisions.


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