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Online calculators – common statistical methods

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

Online calculators – power and sample size

G*Power: Statistical Power Analyses

G*Power computes 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

Health statistics