Mean reversion in emerging market stocks

Hello...

This is the best way to keep it simple! Hi! Here is the full code:

#run Ordinary Least Squares regression to find hedge ratio and then create spread series
df1 = pd.DataFrame({'y':y['price'],'x':x['price']})
est = sm.OLS(df1.y,df1.x)
est = est.fit()
df1['hr'] = -est.params[0]
df1['spread'] = df1.y + (df1.x * df1.hr)

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