Using S-Shaped Curves to Predict Response Rates
重新检验了17周内问卷回收数量的指数增长模型数据，发现有限增长模型（S形曲线）拟合效果更好，对预测问卷回收率有参考价值。
Data used to fit an exponential growth model to the number of questionnaires returned over a 17-week period are re-examined and used to fit a limited growth model. The limited growth model appears to fit the data better.