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You should have a separate table/data mart containing the records of only these 30% customers. This is with the assumption that 70% of the records do not have data of any value. Given that you have only 30% of the records having data, it will not be a basis large enough to apply averages etc. for the empty records.
Are there any good publications on Execution-MiH? Make it inactive
The only recommendation I have is the Dmreview.com, which covers many areas as mentioned in Execution-MiH. |