Is there a direct relationship between diagnosis and treatment, and if so what are the facts of interest in this...
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intersection? What is in the fact table of the star that has diagnosis and treatment as dimensions? Maybe the dimensions you are after are the "types" of treatment, where treatments can be categorized or characterized by some meaningful criterion. Likewise for the diagnosis. Surely there must be a huge number of possible derivatives for a diagnosis or a treatment. Maybe you could consider aggregating the number of treatments for a particular type of treatment and the number of diagnosis for a type of diagnosis. Still, I wonder what correlation between diagnosis and treatment you are trying to discover? Is it the average duration of treatment given certain types of treatments for certain types of diagnosis? Is it the tally of treatments that were considered completely successful, moderately successful, etc.?
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