Length-Biased Sampling in Mall Intercept Surveys
研究了商场拦截调查中因抽样位置集中导致的长度偏倚问题，并针对已知或估计总停留时间、仅知复发时间两种情况提出了修正方法，用实际数据验证了效果。
The authors address length-biased sampling that occurs when sampling is done at central locations in a shopping center. Correction techniques are presented for two situations: when the total length of stay is known or estimated and when only the recurrence time is known accurately. The techniques are illustrated with mall intercept data.