**Diff Two Means**

**Diff Two Proportions **

**Odds Ratio**

**Relative Risk**

**Chi Square**

**ANOVA**

**Correlation**

**Regression**

**Logistic Regression**

**Structural Equation Modeling**

**Multilevel Analysis**

**Additional Resources**

Calculate sample size for a study comparing means (p. 147)

Compute *CI of a sum, difference, quotient, or product* (p. 43)

Difference Between Two Proportions-Power and Sample Size (p. 21)

Calculator for the *confidence interval for the difference between two independent proportions* (p. 45)

Calculate for confidence interval around an *odds ratio* (p. 46)

Calculator for confidence intervals for odds ratio unmatched case control study

Calculate the confidence interval for *relative risk* (p. 147)

Calculate confidence intervals around *chi square* (p. 46)

*ANOVA*-Power and Sample Size (p. 24)

*PSY* calculate confidence intervals around *contrasts* (p. 49)

Power Analysis for ANOVA Designs

Calculate confidence intervals around *rho *(p. 49)

Calculate the 99%, 95%,and 90% confidence intervals for a regression coefficient (p. 51)

Calculate the 99%, 95%,and 90% confidence intervals for *R-squared *(p. 51)

Calculate an adjusted *R-squared* (p. 51)

*R2* calculates confidence intervals for *R-squared *(p. 51)

*R2* manual [pdf] (p. 51)

Calculator the effect size for multiple regression (f2), given a value of R2 (p. 146)

*Logistic Regression* with Binary Covariate(s)-Power and Sample Size (p. 31)

*Logistic Regression* with Exposure Measurement Error (p. 32)

*NIESEM *is a program for calculating user-defined confidence intervals around noncentral fit indices (p. 34)

*Optimal Design Software*-optimal design for longitudinal and multilevel research (p. 37)

*Optimal Design Software Manual* (p. 37)

Probability Distributions and Related Distributions

Calculator for confidence intervals for odds ratio unmatched case control study

Comparing Single Proportion to Known Population

Computer Software for Power Analysis in Covariance Structure Modeling

Distribution Density Calculators, Plotters and RNG's

Calculate sample size necessary to detect the difference between two proportions

Various web-based statistical tools

Free Web Development Resources

Free Web Development Resources - Overview of the Web Color Model

GraphPad QuickCalcs Confidence interval of a SD

Interactive Statistical Calculation Pages

Interactive Statistical Calculation Pages2

Interactive Statistical Calculation Pages

JavaStat -- Retrospective Power Calculations

Martindale's Calculators On-Line Center

Martindale's Calculators On-Line Center Statistics - Courses

Noncentral Student CDF Calculator

Power Analysis for ANOVA Designs

Power Slates in HyperCourseware

Power and Sample Size Calculation for Logistic Regression with Binary Covariate(s)

Sample Size Calculations for Logistic Regression with Exposure Measurement Error

Sample Size Calculator by Raosoft, Inc.

Sample Size for Controlled Trials

The Ideas Behind Statistical Power

Java applet that demonstrates features of ANOVA

Victor Bissonnette's Home Page (useful statistical tables and more)

*Data Generator* is a free, open source script written in JavaScript, PHP and MySQL that lets you generatecustom data in a variety of formats.

Calculate combinations and permutations

*Raynald's SPSS Tools *contains 675 plus examples of syntax, macros, and scripts

Easy Calculation.com-Online Statistics Calculators for mean, median, mode, standard deviation, geometric mean, grouped data arithmetic mean, class interval arithmetic mean, root mean square, correlation coefficient, regression, harmonic mean.