Others have pointed out that the BMI in effect prejudges the
relationship between weight and height. Naturally, I agree. But it's not
clear whether the original height and weight data are available in this
project.
I was delighted to see Paul's report here that reciprocating BMI worked
well. I love reciprocal transformations because they are so simple and
they yield variables with well-defined units An alternative, or a
complement, to transformation would be to work with -glm, link(power
-1)-.
Nick
[email protected]
Seed, Paul
[...]
3) When considering possible transformations, I would aim for ones that
give approximate symmetry. In my own data, 1/BMI = height^2/Weight
performed quite well. Skewness -.0393561, Kurtosis 3.708181.
[...]
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