standardized residuals

I am assuming there is a package that I need to load. ?I looked at the list
of packages and I can't find one for stdres. ?It must be bundled in some
package.

'??stdres' tells me that this function lives in package MASS.

You could also have used rseek to find it:

  http://www.rseek.org

However, stdres doesn't seem to work with mer objects as returned by
the lmer function.

  Titus