Re: Medical Decision-Making

Fri, 8 Mar 1996 22:19:59 +0100

Psychologists have developed a number of measurement techniques to
assign numeric values to things-- psychological states-- that occur
in degree. The most commonly used technique, Likert scaling,
simply asks a subject to rate on an n-point scale, say 1 to 5,
where numbers are associated with verbal labels, such as disagre
very strongly, disagree somewhat, neither agree nor diagree, agree somewhat,
etc. The measurement properties of these scales have been studied
quite well, and there is general agreement that equal-interval measurement,
at least of attitudes, is possible and can be valid.

So you would ask the doctor, rather simply, is the blood pressure
moderate, high, very high, etc... In fuzzy logic you would have him
say how well each term fit, rather than just selecting one. I'd bet
you could get a very good mapping of measurements to BP values.

Test Login ( wrote:

: |> What does it mean that the test result is positive (negative)? Your
: |> high blood pressure (say mu(x)=0.7)?
: |>

: I am very interested in how to get such values like mu(x)=0.7 from a
: physician. Which methods ought to be used?