  Commonly, the comparisons of treatment groups versus a control is performed
for location effects only where possible scale effects are considered as
disturbing. Sometimes scale effects are also relevant, as a kind of early
indicator for changes. Here several approaches for Dunnett-type tests for
location or scale effects are proposed and compared by a simulation study. Two
real data examples are analysed accordingly and the related R-code is available
in the Appendix.
