Calculators

1.   QuickCalcs Online calculator for common statistical methods.

2.   Visual RX Number needed to treat calculator. 

3.   VassarStats Website for statistical computation.      

• simple graph maker
• statistical tables calculator
• data transformations

G*Power: Statistical Power Analyses

G*Power is a tool to compute statistical power analyses for many different t tests, F tests, χ2 tests, z tests and some exact tests. G*Power can also be used to compute effect sizes and to display graphically the results of power analyses.

PS: Power and Sample Size Calculation

PS is an interactive program for performing power and sample size calculations that may be downloaded for free.

It can be used for studies with:

• dichotomous

• continuous

• survival response measures