Hi r-programmers,

I performe Breusch-Pagan tests (bptest in package lmtest) to check the
homoscedasticity of the residuals from a linear model and I carry out carry
out White's test via
bptest (formula, ~ x * z + I(x^2) + I(z^2)) include all regressors and the
squares/cross-products in the auxiliary regression.

But what can I do if I want find coefficient and p-values of variables x, z,
x*z, I(x^2), I(z^2) ? **I wish find out which is responsible of
heteroscedasticity...

Can anyone help?

thanking you in advance,

Gautier RENAULT

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