The expansive learning curve literature in operations management has established how various facets of prior experience improve average performance. In this paper, we explore increased cumulative affects performance variability or consistency. We use a two-stage estimation method heteroskedastic model to examine the relationship between and among paramedics at London Ambulance Service. find tha...

 In this paper, we study stochastic comparisons of order statistics of independent random variables with proportional hazard rates, using the notion of variance majorization.

Germ-cell mutations may occur during meiosis, giving rise to independent mutant gametes in a Poisson process, or before meiosis, giving rise to multiple copies of identical mutant gametes at a much higher probability than the Poisson expectation. We report that the occurrence of these early premeiotic clusters of new identical mutant alleles increases the variance-to-mean ratio of mutation rate...