A tool of statistics. Designed for scientist, doctors, teachers, students,etc. Calculated results are as follows; Chi-square test with Fisher's exact test, sensitivity, specificity, effectiveness, false positive, false negative, positive predictive value, negative predictive value, prevalence rate, odds ratio, relative risk, likelihood ratio for a positive finding (LR+), likelihood ratio for a negative finding (LR-), odds ratio of diagnosis, odds ratio of misdiagnosis, Youden's J, Yule's Q. The formulas and the meanings for each statistical values are also provided. At the start up view, the formulas are displayed before the values are typed. The meanings of the statistical values are explained in the info window. This is an easy statistical tool to use.