Best way to find correlation between data sets.

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Pavel
Pavel 2014-7-21
I have two pixel count data sets from Photoshop, both have the same intensity, but one was calculated while cached and the other was not. I am trying to find an equation that will convert the cached version into the non cached.
Things I've tried: Plotting against each other and using polyfit to find an equation, but the R^2 value was not significant.
This might be impossible because I don't know if different levels of cache were used by Photoshop. I'm looking for ideas, this is a case of I've tried nothing and I'm all out of ideas.
Thanks.

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