How to search the space of programs for a code that solves a given problem? Standard asymptotically optimal Universal Search orders programs by Levin complexity, implementing an exponential trade-off between program length and runtime. Depending on the problem, however, sometimes we may have a good reason to greatly favor short programs over fast ones, or vice versa. Frontier Search is a novel ...

Researchers of regional and international productivity comparisons are increasingly adopting various frontier approaches to examine convergence and the possible causes of productivity differences. We argue that economy-wide technology frontiers estimated with aggregate measures of output are downward biased. This bias extends not only to estimates of the technology frontier, but also produces i...

We explore the impact of climate change adaptation on technical efficiency Ethiopian farmers using panel data collected from 6820 farm plots. employ Green's (2010) stochastic frontier approach and propensity score matching to address selection bias. Our results reveal that improves maize, wheat barley production. also show failure account for bias underestimates average level. findings imply ex...

If future neutrino oscillation experiments show that the neutrino mass spectrum is with normal ordering, m1 < m2 < m3, and the searches for neutrinoless double beta ((ββ)0ν -) decay with sensitivity to values of the effective Majorana mass || ∼> 10 −2 eV give negative results, the next frontier in the quest for (ββ)0ν -decay will correspond to || ∼ 10−3 eV. Assuming that massive neutrinos...

In the standard stochastic frontier model with sample selection, the two components of the error term are assumed to be independent, and the joint distribution of the unobservable in the selection equation and the symmetric error term in the stochastic frontier equation is assumed to be bivariate normal. In this paper, we relax these assumptions by using two copula functions to model the depend...

This paper proposes a simple descriptive model of discrete-time double auction markets for divisible assets. As in the classical models exchange economies, we consider finite set agents described by their initial endowments and preferences. Instead Walrasian-type market models, however, assume that all trades take place centralized where communicate through sealed limit orders buying selling. W...

sergentomyia (sintonius) clydei (sinton) is for the first time recorded from the endemic localities of cutaneous leishmaniasis in sindh, punjab and n.w.f province (pakistan). in view of the published reports about the detection of encephalitis viruses from the species of the genus sergentomyia franca & theodor from the indian localities and their possible role in kala-azar transmission, the cor...

abstract quantitative analysis of production through evaluating the level of factor usage is a major part in agricultural management, which aims at increasing production by optimum usage of resources. this study has estimated and analyzed stochastic frontier production function and calculated technical efficiency of semi-mechanized broiler farms located in gorgan district. the survey data were ...

In this paper we develop an approach that synthesizes the best features of the two main methods in the estimation of production efficiency. Specically, our approach first allows for statistical noise, similar to Stochastic frontier analysis, and second, it allows modeling multiple-inputs-multiple-outputs technologies without imposing parametric assumptions on production relationship, similar to...