Statistics Calculators

 File Name (Click hold mouse button, select "save as" to Download) Calculator Name Function of Calculator 95% confidence intervals You specify the confidence interval you are interested in, it calculates the interval around an effect size estimate for: differences, relative risk, relative risk reduction, and odds ratio. Confidence interval for probabilities, proportions You specify the number of events and the total number of observations, it calculates the confidence interval for that probability. fishersz.xls Fisher z-transformation for doing statistical tests on correlations You specify correlation, it produces Fisher's Z transformation. And the reverse. logit.xls Logit and logistic functions demonstrated You state a number, it produces the logit; likewise for the logistic function (inverse of the logit). Demonstrates the basis of logistic regression for predicting the probability of a category. Odds and probabilities Translates between odds and probabilities. Graphs the relations. Chisq2x2.xls Chi-squared test Calculates Chi-squared statistic and probability for 2 by n tables, for n = 2 through 7. Rate or Proportion Confidence Interval & Power Estimation Calculator Calculate the power that a rate will exceed a target rate given N. TripTria.xls Triplet Triangulator Places a triplet of numbers in trilinear coordinates within a triangle.