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siconv
2010 Jul 07
6
forcing a zero level in contr.sum
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.
Stephen Bond
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