R links not anchored?

Nobody has claimed this yet.

Some package authors rely on not having other packages with the same alias to not provide an anchor on their package on their links.

For example A3 on a3.lm says:

```
\description{
This convenience function calculates the A3 results specifically for linear regressions. It uses R's \code{\link{glm}} function and so supports logistic regressions and other link functions using the \code{family} argument. For other forms of models you may use the more general \code{\link{a3}} function.
}
```

This assumes that it goes to stats::glm but it could resolve to chantrics::glm or mixlm::glm

Start with the A3 example on a3.lm and compare how \link{glm} resolves when stats::glm, chantrics::glm, or mixlm::glm are available. Determine the intended anchoring behavior for package authors and document or test the result; done means links resolve unambiguously without relying on aliases.

Written by the indexing model from the issue text.