Berk M L
Am J Public Health. 1985 Nov;75(11):1338-40. doi: 10.2105/ajph.75.11.1338.
This analysis of data from the Physicians' Practice Survey indicates that estimates made from early responders closely approximate those obtained at the conclusion of a longer field period.
对医生实践调查数据的分析表明,早期回复者提供的估计值与较长实地调查期结束时获得的估计值非常接近。