abstract since about 34% of areas under rice cultivation in whole country is attributed to gilan; in this study we pay attention to some economical dimensions, especially economic values of inputs in this region. data were collected from 80 rice producers in 2007-2008. consider to importance the parametric approach in production structure and factors demand, applying seemingly unrelated regress...

Many applications in medical statistics and other fields can be described by transitions between multiple states (e.g. from health to disease) experienced individuals over time. In this context, multi-state models are a popular statistical technique, particular when the exact transition times not observed. The key quantities of interest rates, capturing instantaneous risk moving one state anoth...

A parsimonious and compatible system of taper, total, and merchantable volume equations sharing a common vector of three parameter estimates was derived from Clark and Saucier’s (1990) volume ratio model. Clark and Saucier’s model expresses volume inside bark as a function of outside bark diameter and is itself not compatible with the derived taper equation. To ensure compatibility, models were...

The infinity Laplace equation ∆∞u = 0 arose originally as a sort of Euler–Lagrange equation governing the absolute minimizer for the L∞ variational problem of minimizing the functional ess-supU |Du|. The more general functional ess-supUF (x, u, Du) leads similarly to the so-called Aronsson equation AF [u] = 0. In this paper we show that these PDE operators and various interesting generalization...