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Context: Taking time series levels and converting to 10 day changes in levels. Then doing a linear regression on the 10 day changes over a period of time eg 500 overlapping samples, where Y is the target and X is the explanatory variable(s).The result of the regression will be used to decompose the Y into fitted data and residue data for the in sample period.

Issue: Required to produce performance measurement of the quality of the fit using Adjusted R^2.

Question: Can the standard formula for adjusted R^2 be used or does there need to be an adjustment/allowance made for the fact that the data being used is overlapping.

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