The following is a set of web-based statistical calculators provided free of charge to anyone who finds them of use. The calculators and their results are presented here as is, without any guarantee. While every attempt to ensure their accuracy has been made, even exact formulas can yield inexact results intermittently.

Effect Size Calculator

Reliability Coefficient Calculator

Kuder-Richardson 21 Calculator

Chi-Square(1) Calculator

Pooled Observations Calculator

Spearman-Brown/Flanagan-Rulon Calculator

2 x 2 Measures of Association

Inter-Rater Agreement

Adjusted R2

PRESS

R2Cross-Validation

Copyright ©2007 David A. Walker All Rights Reserved.