Independent Sample Tests - Comparing Two Means
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The tests employed depend upon:
- Whether a weight is or is not applied (or, equivalently, a design effect has been specified).
- Settings in Statistical Assumptions (in addition to the settings below, tests are not conducted when a group has a sample size less than the number specified in Minimal sample size for testing).
If viewing Column Comparisons and an ANOVA-Based Column Comparison test has been selected in Multiple comparison correction then:
- Multiple comparison correction= Fisher LSD: Multiple Comparisons t-Test (Fisher LSD)
- Multiple comparison correction= Tukey HSD: Tukey HSD
- Multiple comparison correction= Dunnett: Dunnett’s Pairwise Multiple Comparison
- Multiple comparison correction= Duncan: Duncan’s New Multiple Range Test
- Multiple comparison correction= Bonferroni (Pooled t-Test): Multiple Comparisons t-Test with Bonferroni Correction
- Multiple comparison correction= Newman-Keuls (S-N-K): Newman-Keuls (S-N-K)
- Multiple comparison correction= False Discovery Rate (pooled t-test): Multiple Comparisons t-Test with False Discovery Rate Correction
Else:
- Means = Non-parametric: Kruskal-Wallis Test
- Means = z-test:
- If the data is weighted: Independent Complex Samples Z-Test - Comparing Two Means
- If the data is not weighted:
- If the sample size in either group is less than Equal variance in tests when sample size is less than: Independent Samples Z-Test - Comparing Two Means with Equal Variances
- Else: Independent Samples Z-Test - Comparing Two Means with Unequal Variances
- Means = t-test:
- If the data is weighted: Independent Complex Samples t-Test - Comparing Two Means
- If the data is not weighted:
- If the sample size in either group is less than Equal variance in tests when sample size is less than: Independent Samples t-Test - Comparing Two Means with Equal Variances
- Else: Independent Samples t-Test - Comparing Two Means with Unequal Variances
- Means = Quantum Means: Independent Samples - Quantum Column Means Test
- Means = Survey Reporter Means: Independent Samples - Survey Reporter Column Means Test