[R] Question about the test of hartley and box

[Marco Vinisio Martinez]

Hello

I have 2 questions:

1. How I can do the test of hartley for homogeneity of variances?
2. How I can do the test of Box for homogeneity of variances?

Thanks in advance
-- 
Marco Vinisio Martinez
Profesor Departamento de Matematicas y Departamento de Biologia
Pontificia Universidad Javeriana