The short answer would be: if you are done with the statistics, and you need to manage your available storage capacity,...
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and you can reproduce the statistics, and you don't need to retain a history of those statistics, then deleting them seems prudent. Hoever, I can't give you an informative answer to this question without more context. What type of statistics (domain distribution, table capacity, usage, read/load/exception)? What kind of analysis are you referring to (source content analysis, target table acceptance testing analysis)? What tables, staging tables, source tables, target tables?
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