逐次加入のある資源におけるパラメーターの推定について-IV : 〓法による推定値の精度

概要

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1. The effect of the level of δ for the variability of the estimated value of parameter by the tracing method was remarkable. For the following analysis, the value of b was dicided to be the lowest level, that is, δ(Ir)=0.02, δ(M)=0.1 and δ(q)=0.05. 2. The variance of the estimated values of parameters was minimum when the tracing index ?? 1 was used, indicating that ?? 1 is most suitable among the three tracing indices examined. 3. For the evaluation of the variability of estimated value of parameter, artificial catch and fishing intensity data produced by a simple variation model with error control parameters (αf and αc) were applied because it was difficult to evaluate the error of the actual data and data processing system. Three levels of αf and αc were tried. 4. The effect of αf and αc on the variance of the estimated values of population parameter were very significant, and significance of the interaction of αf and αc was also observed. 5. The variance of estimated values in case of αf=αc=0.15 was very large, about nine times of that in αf=αc=0.05.
公益社団法人日本水産学会の論文