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What input dataset to use for quantitative strategy rules?

Hey, In recent months I’m being developing an excel spreadsheet with a brute-force approach to search through thousands of permutations (building-blocks of strategy rules) to obtain an optimal strategy candidates list etc.

In relation to this approach, what is the widely employed medium to normalize/convert a currency pair time series to input into each strategy rule, as so not to have cross-data compatibility issues.
I hope I have explained the question clearly and await your reply…