Science. 1972 Apr 14;176(4031):163-4. doi: 10.1126/science.176.4031.163.
There has been concern about the possibility of selection bias in cloud seeding experiments. Covariates and experimental design have been used to obtain an estimate of this bias. The results indicate that there was no selection bias in the Caribbean and Florida series of cloud seeding experiments.
人们一直担心云种实验中存在选择偏差的可能性。协变量和实验设计被用来估计这种偏差。结果表明，在加勒比海和佛罗里达州的一系列云种实验中，没有选择偏差。
