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I have constructed a mean reverting spread using two indexes. I know they have to be mean reverting, but when plotted side by side they are mean reverting for a little bit and then deviate and head one direction, all because of a few returns. I was wondering what the proper way of normalizing the trend or dealing with a non-stationary mean in a reverting series?

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I think I got it. Detrending the data has seemed to be the best way to normalize it. – user5003 Mar 25 '13 at 4:35
Can you reply to your own question giving more details about the steps you used to do it ? Or was it as simple as estimating the constant parameter and removing it ? – BlueTrin Mar 25 '13 at 10:39

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