[R] how to run ANCOVA?

Richard M. Heiberger rmh at temple.edu
Thu Aug 24 08:16:00 CEST 2006


> But how is that different from just a 3-way ANOVA with age, diagnosis,
> and gender as the the three effects?  Isn't ANCOVA a fundamentally
> different model?

> Thanks,
> Sasha

ANCOVA is a linear model with both factors and continuous variables
on the right-hand side of the model formula.  In pre-computer texts,
the commonly used algorithm hid that fact.

Rich



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