Shirley E A
Stat Med. 1982 Jul-Sep;1(3):281-91. doi: 10.1002/sim.4780010310.
The advantages and disadvantages of using extraneous information about the relationship between variate and covariate in analysis of covariance are examined. The problem is considered both theoretically and by a simulation study. It is found that the usefulness of extraneous information in increasing the precision of analysis of covariance can be assessed using simple formulae.
考察了在协方差分析中使用关于变量与协变量关系的外部信息的优缺点。从理论和模拟研究两方面对该问题进行了探讨。结果发现，可使用简单公式评估外部信息在提高协方差分析精度方面的有用性。
