Comparing dual with single treat ments in block design
محل انتشار: نخستین کنفرانس آمار ایران
سال انتشار: 1371
نوع سند: مقاله کنفرانسی
زبان: انگلیسی
مشاهده: 1,294
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شناسه ملی سند علمی:
ISC01_047
تاریخ نمایه سازی: 15 اسفند 1388
چکیده مقاله:
Experiments having two treatment factors and one blocking factor are considered in which a particular combination of treatment factor levels must be excluded. The motivation for the work is a medical trial of two drugs in which a double placebo cannot be administered on ethical grounds. The contrasts of interest compare the effects of having both treatment factors at non-zero labelled levels with the effects of having only one treatment factor at a non-zero labeled level. A lower bound is derived on the average variance of the contrast estimators n x m experiments. For n×2 experiments a balance property is defined which is possessed by many efficient designs. Designs having the property are characterized through the structure of the intra-block information matrix. Efficient reinforced group divisible designs are constructed and assessed against the lower bound.
کلیدواژه ها:
A-criterion ، Dual Versus Single Treatment Contrasts ، Factorial Experiment ، Group Divisible Designs ، Part. Balance