brood_size

Data to estimate number of broods hatched (B) and average brood size (BS) for the four periods. Variables: BROOD - brood ID, MAHATCH - hatching date (number of days since 1 March), BROODSIZE - number of chicks hatched, PERIOD - categorical variable giving the four periods.本数据集用于估算四个时期内的孵化窝数（记为B）与平均窝雏数（记为BS）。数据集包含以下变量：BROOD：窝ID（brood ID）；MAHATCH：孵化日期（以3月1日为基准的累计天数）；BROODSIZE：孵化出的雏鸟数量；PERIOD：表征四个时期的分类变量。