This operator evaluates a list of formulas whose corresponnding RHS statistics will be multiplied elementwise. They are required to be nonnegative.
# binary: Prod(formulas, label) # valued: Prod(formulas, label)
a list (constructed using
If a formula in the list has an LHS, it is interpreted as follows:
used to specify the names of the elements of the resulting term product vector. If
Note that each formula must either produce the same number of statistics or be mapped through a matrix to produce the same number of statistics.
A single formula is also permitted. This can be useful if one wishes to, say, scale or multiply together the statistics returned by a formula.
Offsets are ignored unless there is only one formula and the transformation only scales the statistics (i.e., the effective transformation matrix is diagonal).
Curved models are supported, subject to some limitations. In particular, the first model's etamap will be used, overwriting the others. If
label is not of length 1, it should have an
attr -style attribute
"curved" specifying the names for the curved parameters.
The current implementation piggybacks on the
Exp , and
Sum operators, essentially
Exp(~Sum(~Log(formula), label)) . This may result in loss of precision, particularly for extremely large or small statistics. The implementation may change in the future.
ergmTerm for index of model terms currently visible to the package.
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