Dataset: sertraline.dat Source: J. Mendels, A. Camera, and C. Sikes (1995). "Sertraline Treatment for Premature Ejaculation", Journal of Clinical Psychopharmacology, Vol. 15, #5, pp341-346. Description: Summary results of clinical trial of viagra (independent samples aka parallel groups). All measures at endpoint (groups equivalent at baseline). Measures: 1= Successful attempts at intercourse 2= Patient satisfaction level 3= Latency to ejaculation from intromission 4= Clinical gobal impression severity level (low scores better) 5= Therapeutic index (low scores are beter) Variables/columns Measure 1 Viagra sample size 3-4 Viagra mean 6-9 Viagra std dev 11-14 Placebo sample size 19-20 Placebo mean 22-26 Placebo std dev 28-31