1. Confidence intervals rather than P values: estimation rather than hypothesis testing;Gardner, M.J.; Altman, D.G.;BrMedJ,1986
2. An introduction to medical statistics;Bland, M.,1987
3. Practical non-parametric statistics;Conover, W.J.,1980
4. Minitab handbook;Ryan, B.F.; Joiner, B.L.; Ryan, T.A.,1985
5. Calculating confidence intervals for regression and correlation;Altman, D.G.; Mj, Gardner;BrMedJ,1988