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st: RE: RE: Code to generate variable indicating date that CD4 drops below 250

From	"Polis, Chelsea B." <[email protected]>
To	"[email protected]" <[email protected]>
Subject	st: RE: RE: Code to generate variable indicating date that CD4 drops below 250
Date	Wed, 1 Apr 2009 12:35:00 -0400

Nick Cox notes: "Chelsea's problem is easily soluble with the data structure Chelsea has,
but a different data structure is advisable nevertheless."

Can you please clarify why a different data structure is advisable?

Many thanks!
Chelsea

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