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greco
2007 Feb 07
1
heteroscedasticity problem
Dear Listers,
I have a regression problem (x->y) with biological data, where x influences
y in two ways, (1) y increases with x and (2) the variation around the mean
(residuals) decreases with increasing x, i.e. y becomes more 'predictable'
as x increases.
The relationship is saturating, y~a + bx + cx^2, gives a very good fit.
I know basically how to test for heteroscedasticity. My