When diagnostic criteria change, old research problematic.

From a U.S. clinical psychologist:

"When diagnostic criteria change, the old research is problematic. It may be possible to obtain the raw data from past research and re-analyze it using the new criteria. Otherwise, the research on schizophrenia may include people who no longer qualify as schizophrenic." 

July 2014

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When diagnostic criteria change, old research problematic.
2. What about people labeled under old criteria? »2. What about people labeled under old criteria?
1. Can you use old research? »1. Can you use old research?
When definitions change, experiment must be repeated. »When definitions change, experiment must be repeated.
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