Choosing the correct statistical test
Choosing the correct statistical test
Questions to ask yourself:
1. What scale of measurement has been used?
2. Are you testing differences between groups or associations between variables?
3. Are the samples independent or related (same person tested twice or paired ppl)?
4. How many groups are involved?
Nominal data:
Ordinal data:
Interval/ratio data:
-----------------------
Coefficient of Contingency
Any number of cells
McNemar Test
Chi Square
Related selection
Independent Selection
Hypothesis of Association
Hypothesis of Difference
Nominal Data
Friedman ANOVA by ranks
Wilcoxon T test
More than 2 groups
Kruskal-Wallis H Test
Mann-Whitney U
More than 2 group
Spearman r
Two groups
Two Groups
Related selection
Independent Selection
Hypothesis of Association
Hypothesis of Difference
Ordinal Data
Multiple regression
With prediction
Multiple R
Regression of Y on X
With prediction
Pearson r
More than 2 groups
Factorial ANOVA
More than 1 IV
Within-subjects ANOVA
Paired t-test
2 or more groups
One-way ANOVA
Independent t Test
2 or more groups
Two groups
Two groups
Two Groups
Related selection
Independent Selection
Hypothesis of Association
Hypothesis of Difference
Interval Data
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