Band 2: A Computer Program for Sample Size Computations for Banding Studies

Band 2 computes the number of animals that must be banded in order to achieve a specified level of precision for survival rates estimated using band recovery models. Sample sizes necessary for estimating survival rates of banded birds are derived based on specified levels of precision. The equations are derived for studies involving adults only, or adults and young, and the banding study can be new or ongoing. Precision is based on the desired coefficient of variation (CV) of the survival estimates. The CV for annual survival estimates, the CV for mean annual survival estimates, and the length of the study must be specified to compute samples sizes. A computer program, BAND2, has been written to compute the necessary sample sizes given the desired precision level and length of the study. A description of the input and output for this program is described.

Band 2 可用于计算：当使用环志回收模型（band recovery models）估算存活率时，为达到指定精度水平所需环志的动物总数。针对环志鸟类存活率估算所需的样本量，可基于指定精度水平推导得出。这些推导所得的公式适用于仅包含成鸟，或同时包含成鸟与幼鸟的研究场景，且环志研究既可以是全新项目，也可以是已开展的在研项目。精度以存活率估算值的期望变异系数（coefficient of variation, CV）为衡量依据。在计算样本量时，需指定年度存活率估算值的变异系数、年均存活率估算值的变异系数，以及研究持续时长。现已开发一款名为BAND2的计算机程序，可基于指定的精度水平与研究时长计算所需样本量。本文还将对该程序的输入与输出内容进行说明。