/confidence-interval-calculators/index.htmlHere you can find some calculators for computing approximate confidence intervals for observed Pearson correlations or r-square values from multiple regressions, or for differences between two independent correlations or r-squares, given the respective sample size(s).Hugoen-usMon, 22 Dec 2025 00:00:00 +0000/confidence-interval-calculators/pearson/index.htmlMon, 22 Dec 2025 00:00:00 +0000/confidence-interval-calculators/pearson/index.htmlObserved Pearson correlation (r): Sample size (n): Confidence interval (CI): 80% 85% 90% 95% 99% Approximate confidence interval: to Approximate confidence intervals for an observed Pearson r correlation, given the value of r and the sample size n. For example: for an observed correlation of 0.657 and a sample size of 15, the 95% confidence interval ranges from 0.22 to 0.87. Note: Confidence intervals are based on Fisher’s r to z transformation./confidence-interval-calculators/pearson-dif/index.htmlMon, 22 Dec 2025 00:00:00 +0000/confidence-interval-calculators/pearson-dif/index.htmlSample 1 Sample 2 Observed Pearson correlation (r): Sample size (n): Confidence interval (CI): 80% 85% 90% 95% 99%/confidence-interval-calculators/rsquare/index.htmlMon, 22 Dec 2025 00:00:00 +0000/confidence-interval-calculators/rsquare/index.htmlObserved R-square (R2): Number of predictors (k): Sample size (n): Confidence interval (CI): 80% 85% 90% 95% 99%/confidence-interval-calculators/rsquare-dif/index.htmlMon, 22 Dec 2025 00:00:00 +0000/confidence-interval-calculators/rsquare-dif/index.htmlObserved R-square (R2): Number of predictors (k): Sample size (n): Confidence interval (CI): 80% 85% 90% 95% 99%