1. Biostatistics in Clinical Medicine;Ingelfinger,1983
2. The importance of beta, the type II error and sample size in the design and interpretation of the randomized control trial;Freiman;N Engl J Med,1978
3. Statistical Methods in Medical Research;Armitage,1971
4. A Primer on Multivariate Statistics;Harris,1975
5. P values;Ware,1986