R: Covariance of in-dyad values incident on each actor

nodeicovar-ergmTerm {ergm} | R Documentation

## Covariance of in-dyad values incident on each actor

### Description

This term adds one statistic equal to ∑_{i,j,k} y_{j,i}y_{k,i}/(n-2) . This can be viewed as a valued analog of the `istar(2)` statistic.

### Usage

    # valued: nodeicovar(center, transform)

### Arguments

`center` | If `center=TRUE` , the y_{\cdot,\cdot} s are centered by their mean over the whole network before the calculation. Note that this makes the model non-local, but it may alleviate multimodailty.
`transform` | If `transform="sqrt"` , y_{\cdot,\cdot} s are repaced by their square roots before the calculation. This makes sense for counts in particular. If `center=TRUE` as well, they are centered by the mean of the square roots.

### Note

Note that this term replaces `nodeisqrtcovar` , which has been deprecated in favor of `nodeicovar(transform="sqrt")` .

### See Also

`ergmTerm` for index of model terms currently visible to the package.

[Package ergm version 4.2.2 Index]