The number of expected generations of Gonatocerus triguttatus Girault, a parasitoid of the glassy-winged sharpshooter, Homalodisca vitripennis (Germar), in California (USA) was estimated using life table statistics and degree–day requirements. Between 0–18.9 and 0– 25.3 generations per year were estimated across different climatic regions in California, using life table and degree–day models, r...

Using the model of random censorship, a necessary and sufficient condition for the consistency of the standard (actuarial) life table estimate of a survival distribution is derived. We establish the asymptotic normality of this estimate, showing that Greenwood's variance formula is nearly correct. In the case of a continuous survival distribution we establish limiting normality for the product ...