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To: stock bull who wrote (83300)	12/2/1998 2:49:00 PM
From: Chuzzlewit	Read Replies (1) \| Respond to of 176387

No, I think those refer to measurement problems. I am talking about something like this: If A is a necessary and sufficient condition for B, then you expect that everytime you find A you will also find B. The existence of just one A without the presence of B is sufficient to invalidate the hypothesis. And the presence of B in the absence of A is also sufficient to invalidate the hypothesis. Now this is a very simple example, but it is useful for example in demonstrating the causative agent of some diseases. For example, sickle cell anemia is always associated with a certain aberrant form of hemoglobin. I just wish that the TAers would construct their hypotheses in such a way that they could be "falsified". TTFN, CTC