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Builds a formula from a number of factors
fp_defrel(arg)
A formula.
If it is a formula, it is returned verbatim. If it is a number, a formula is built with the number of factors. If it is neither a formula nor a number, an error is thrown.
# Defining relationships with three factors fp_defrel(3) # Defining relationship I=ABC fp_defrel(~A*B*C)
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