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Earnings Stability

Hi,

Been trying to use earnings stability (standard deviation of eps) across the past 5 years as an input for factor investing algo. Would appreciate it if anyone has an idea on how to do it. I have attached my attempt at it.

class Earnings_Stability(CustomFactor):  
    inputs = [earnings_report.normalized_basic_eps, USEquityPricing.close, valuation.shares_outstanding]  
    window_length = 252*5 # yearly earnings to prevent seasonal adjustment  
    def compute(self, today, assets, out, eps, close, shares):  
        out[:] = np.nanstd(np.diff(eps, axis=0), axis = 0)  

Thanks,
J