This term adds one network statistic to the model equaling
the sum of
abs(attr[i]-attr[j])^pow for all edges
# binary: absdiff(attr, # pow=1) # valued: absdiff(attr, # pow=1, # form="sum")
quantitative attribute (see Specifying Vertex attributes and Levels (
power to which to take the absolute difference
character how to aggregate tie values in a valued ERGM
ergm versions 3.9.4 and earlier used different arguments for this
ergm-options for how to invoke the old behaviour.
ergmTerm for index of model terms currently visible to the package.
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