Compare two data sets



Hi,
I have two sets of data ( say predicted and actual) that I would like
to compare and come up with a "score" that tells me how close the
predicted was to the actual data.
The data I have has 48 intervals (for each half hour in a day).
I tried to get compare the data sets using Root Mean Square method, but
I am not very confident that it is the best way to do it.
Is there any other way I can do this. I am using Excel for the
analysis.

.



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