[R] correct use with fligner test

[gaiarrido]

Hi R users,
Iwant to run a model, but want to know previously if my data present
homoscedascity:
the model is something like this: 
glm(ax~a*b*c*d)

I´ve found four different ways to test for homoscedascity, but i want to
know which is correct:

1.-   > fligner.test(glm(x~a*b*c*d))

2.-   > fligner.test(x~a*b*c*d)

3.-   > fligner.test(x~a,b,c,d)

4.-   > interc<-interaction(a,b,c,d)
        > fligner.test(x,interc)

Thanks in advance




-----
Mario Garrido Escudero
PhD student
Dpto. de Biología Animal, Ecología, Parasitología, Edafología y Qca. Agrícola
Universidad de Salamanca
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