This term adds one network statistic to the model equaling the sum over the actors of each actor's degree taken to the 3/2 power (or, equivalently, multiplied by its square root). This term is an undirected analog to the terms of Snijders et al. (2010), equations (11) and (12). This term can only be used with undirected networks.
# binary: degree1.5ergmTerm for index of model terms currently visible to the package.
ergm:::.formatTermKeywords("ergmTerm", "degree1.5", "subsection")