Daniel Soper Sample Size Calculator. Please enter the necessary parameter values and then click Calculate. This calculator will tell you the minimum required sample size for a multiple regression study given the desired probability level the number of predictors in the model the anticipated effect size and the desired statistical power level.
This calculator will tell you the significance both one-tailed and two-tailed probability values of a Pearson correlation coefficient given the correlation value r and the sample size. The calculator computes the minimum required sample size for a significance test of the addition of a set of predictor variables B to the model over and above another set of predictor variables A given the expected effect size probability level and power level. Structural Equation Model Sample Size Calculator Online Software.
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If the sample size calculator says you need more respondents we can help. However Monte Carlo simulation is becoming an increasingly preferred method for an in-depth discussion see Wolf et al 2013. Knowing if your sample is large enough to detect an expected or hypothesized effect is critical when conducting analytics studies that rely on t-tests. Russ Lenth of the University of Iowa has a number of intuitive Java applets for running power analyses here.
