Optimal step-stress test under progressive type-I censoring

We consider in this work a k-step-stress accelerated test with equal duration steps /spl tau/. Censoring is allowed at each change stress point i/spl tau/, i=1,...k. The problem of choosing the optimal /spl tau/ is addressed using variance optimality as well as determinant-optimality criteria. We investigate in detail the case of progressively Type-I right censored data with a single stress variable.