Most wild animals face concurrent challenges by multiple
infectious organisms, and immunological responses triggered by
some parasites may increase susceptibility to other infectious agents.
Immune-mediated interactions among parasites have been investigated
among individuals in a population, but less is known about
broader comparative patterns. We investigated the “macro-micro facilitation
hypothesis”...
We review nonparametric estimation of efficiency and productivity, by which we mainly mean activity analysis, or data envelopment analysis (DEA). The review covers topics that we hope will be of special interest to those doing research in the realm of agriculture. We also include a brief appendix addressing nonparametric estimation...