[R] MANOVA and Extra Sums-of-Squares Tests

[chris33]

I would like to conduct an extra sum-of -squares test that compares a full
MANOVA model (with all 1st order interactions) to a reduced model (no
interactions) to determine if I can drop all interactions at the same time. 
This is analagous to an extra sum-of-squares F-test in ANOVA, but instead
using MANOVA.  Is there a command in R that does this?  If not, is there a
command that calculates residual sum-of-squares and cross-product matrices? 
Thanks.

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