We consider the problem of comparing sojourn time distributions of a transient state in a general multistate system in two samples (groups) when the transition times are right censored. Using the reweighting principle, a two-sample Mann–Whitney type of <InlineEquation ID="IEq1"> <EquationSource Format="TEX">$$U$$</EquationSource> </InlineEquation>-statistic is constructed that...</equationsource></inlineequation>

Gompertz functions have been widely used in characterizing biological growth curves. In this paper we consider D-optimal designs for Gompertz regression models. For homoscedastic Gompertz regression models with two or three parameters, we prove that D-optimal designs are minimally supported....