Calibration of the self-thinning frontier in even-aged monocultures is hampered by scarce data and by subjective decisions about the proximity of data to the frontier. We present a simple model that applies to observations of the full trajectory of stand mean diameter across a range of densities not close to the frontier. Development of the model is based on a consideration of the slope s = ln(...

Since the celebrated Gibbard-Satterthwaite impossibility results and Gibbard’s 1977 extension for randomized rules, it is known that strategyproofness imposes severe restrictions on the design of social choice rules. In this paper, we employ approximate strategyproofness and the notion of score deficit to study the possible and necessary trade-offs between strategyproofness and efficiency in th...

The standard assumption in the efficiency literature that firms desire to produce on the production frontier may not hold in an oligopolistic market where the production decisions of all firms will determine the market price, i.e. an increase in a firm’s output level leads to a lower market clearing price and potentially-lower profits. This paper models both the production possibility set and t...

Background Despite increasing reports of successful pregnancies whilst using Efavirenz (EFZ), the drug remains Category C during pregnancy due to concerns around teratogenicity [1]. Additionally, EFZ can render many hormonal methods of contraception less effective. For these reasons, UK guidance suggests that HIV positive women should be informed of these effects before commencing treatment [2]...

bootstrapping the dea is one of the current methods of measuring robust efficiency by constructing a confidence interval and measuring the noise (bias) in production. in this study, two estimators: the conventional data envelopment analysis (dea) and bootstrap simulation with 2,000 bootstrap iterations were applied on a cross sectional data of 296 broiler farms in peninsular malaysia. the objec...

Among today’s rich economies, per capita output levels diverged before converging to the levels of the frontier economy. Since frontier economies grew at stable rates, non-frontier economies display an S-shaped transition path. Along this transition, there are "catapult effects": longer episodes of stagnation are associated with faster subsequent rates of convergence to the frontier. Many of to...

We study clustering and percolation phenomena for a model of statistically inhomogeneous two-phase random media, including functionally graded materials. This model consists of inhomogeneous fully penetrable ~Poisson distributed! disks and can be constructed for any specified variation of volume fraction. We quantify the transition zone in the model, defined by the frontier of the cluster of di...

And-Parallel Machines* Nachum Dershowitz and Naomi Lindenstrauss Department of Computer Science, The Hebrew University, Jerusalem 91904, Israel The deterministic Turing machine, though abstract, can still be seen as a model of a realistic computer. The same cannot be said for the nondeterministic Turing machine as a model of parallel computing. We introduce several abstract machines with fine-g...