[R] ANCOVA power

[Xan]

Dear list members:

I am trying to calculate power for an ANCOVA analysis.

I have found different solutions such as power.t.test and power.anova.test
but they seem to refer to the ANOVA part of the ANCOVA. 

My model is of the form:
lm (y ~ factor + x1 + x2 + x2*myfactor)

where myfactor is a factorial variable. And I am interested in calculating
the power of the significance test, mainly for the interaction term between
x2 and the factor. 

I would appreciate you help

Xan.

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