blockdiagonalize function

Block-diagonal models using ergm

These two functions are used to go back and forth from a pooled ergm vs a blockdiagonal model, the latter to be fitted using ergm::ergm .

blockdiagonalize(x, attrname = "block")

splitnetwork(x, attrname)

ergm_blockdiag(formula, ...)

Arguments

• x: In the case of blockdiagonalize, a list of networks or matrices. For splitnetwork a single network object with a vertex attribute that can be used to split the data.
• attrname: Name of the attribute that holds the block ids.
• formula: An ergm model which networks' will be wrapped with blockdiagonalize (see details).
• ...: Further arguments passed to the method.

Returns

An object of class ergm::ergm .

Details

The function ergm_blockdiag is a wrapper function that takes the model's network, stacks the networks into a single block diagonal net, and calls ergm::ergm with the option constraints = blockdiag("block").

One side effect of this function is that it loads the ergm package via requireNamespace , so after executing the function ergm the package will be loaded.

Examples

library(ergm)
data(fivenets)

fivenets2 <- blockdiagonalize(fivenets, attrname = "block") # A network with
ans0 <- ergm(
  fivenets2 ~ edges + nodematch("female"),
  constraints = ~blockdiag("block")
  )
ans1 <- ergmito(fivenets ~ edges + nodematch("female"))

# This is equivalent
ans2 <- ergm_blockdiag(fivenets ~ edges + nodematch("female"))