On Jul 7, 2010, at 3:13 PM, Bond, Stephen wrote:
I need to use contr.sum and observe that some levels are not
statistically different from the overall mean of zero.
What is the proper way of forcing the zero estimate? It seems the
column corresponding to that level should become a column of zeros.
Is there a way to achieve that without me constructing the design
matrix?
Thank you.
lm( formula = z ~ x + y + 0, ...) _might_ do something close to
what you want.
David Winsemius, MD
West Hartford, CT
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