This paper investigates habitat-fisheries interaction between two important resources in the Chesapeake Bay: blue crabs and Submerged Aquatic Vegetation (SAV). A habitat can be essential to a species (the species is driven to extinction without it), facultative (more habitat means more of the...

Opinions differ among economists as to how effective statistical analyses using time series data can be in identifying factors affecting demand and in measuring their influences. Although this presentation may not materially modify these opinions, it should at least succeed in making even the...

The study reported in the following paper was based on a survey conducted by the Institute of Statistics, North Carolina State College. The survey was designed to assist the Livestock and Poultry Statistics Branch, of the Agricultural Estimates Division to isolate factors that may account for...

The demand for U.S. feed grain is estimated using a six-equation simultaneous model. Four different utilizations of feed grain and feed grain price as well as the number of animal units fed are estimated. The reduced form of the model is used to provide forecasts of the endogenous variables for...

Methods have been developed recently for continual evaluation of structural stability for model specification CUSUM and CUSUMSQ tests suggested by Brown, Durbin, and Evans employ recursively ! calculated residuals to permit the examination of structural stability Easily developed plots can be...