Does survey mode matter? Comparing in-person and phone agricultural surveys in India
比较了印度农业影响评估中面对面与电话调查的差异，发现电话调查的均值和方差更大，但处理效应估计稳定，精度较低，对研究设计和证据汇总有参考价值。
Ubiquitous mobile phone ownership makes phone surveying an attractive method of low-cost data collection. We explore differences between in-person and phone survey measures of agricultural production collected for an impact evaluation in India. Phone responses have greater mean and variance, a difference that persists even within a subset of respondents that answered the same question over both modes. Treatment effect estimation remains stable across survey mode, but estimates are less precise when using phone data. These patterns are informative for cost and sample size considerations in study design and for aggregating evidence across study sites or time periods.