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What is not?

 Impossible is not a fact, its an opinion 

Multiplicative CF

May 23, 2010 by dangyogi

When a more specific diagnosis (eg, vasomotor rhinitis) depends on another (more general) diagnosis (perennial rhinitis), it seems to make sense to use the additive CF method for the questions attached to the specific diagnosis (eg, is smoke a trigger on vasomotor rhinitis), and then multiply this number (which is between 0 and 1) with the CF for the more general diagnosis (which is also between 0 and 1).

The problem with using the additive approach in this situation is that the more specific diagnosis will have a positive CF from its questions being answered favorably, even though the more general diagnosis has a CF of zero.  The multiplicative approach solves this.

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