Effect Size Calcs

Use these files/links to calculate effect size estimates and confidence intervals (PSYC 687).

  • One sample t-test: Use the datafile NoncT.sav and syntax file T-d-1sample.sps.

  • Independent t-test: Copy the descriptives from your output into this website.

  • Dependent t-test: Use the syntax file d-dependent t.sps.

  • One-way ANOVA: Get eta-squared directly from SPSS. No CI needed.

  • One-way chi-square: Use the phi formula from the slides.

  • Two-way chi-square: Use the phi formula and/or odds ratio from SPSS.

  • McNemar test: Use the Excel file OR-McNemar.xlsx.

  • Pearson correlation: Use the Excel file CI-R and R2.xlsx.

Bonus: This Excel file, created by Ting Huang, can do all sorts of calculations for PSYC 687.