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# A SYSTEM FOR CHOOSING STATISTICS - PowerPoint PPT Presentation

A SYSTEM FOR CHOOSING STATISTICS. What type of design do you have? What do you want to find out? What type of data do you have? . Type of Design: Descriptive. What is a typical score? interval/ratio, no outliers: mean ordinal or higher: median nominal: mode

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Presentation Transcript

• What type of design do you have?

• What do you want to find out?

• What type of data do you have?

• What is a typical score?

• interval/ratio, no outliers: mean

• ordinal or higher: median

• nominal: mode

• How spread out are the scores?

• interval/ratio: standard deviation

• interval/ratio: Pearson r w/ test of sig.

• ordinal: Spearman rho w/ test of sig.

• dichotomous: Phi w/ test of sig.

• interval/ratio & dichotomous: point biserial w/ test of sig.

• Two Groups:

• interval/ratio: Independent Samples t

• ordinal: Wilcoxon Rank-Sum

• nominal: Chi-Square Goodness of Fit

• Three or More Groups:

• interval/ratio: One-Way BS ANOVA

• ordinal: Kruskal-Wallis ANOVA

• nominal: Chi-Square Goodness of Fit

• Two Conditions:

• interval/ratio: Dependent Samples t

• ordinal: Wilcoxon T

• Three or More Conditions:

• interval/ratio: RM ANOVA

• ordinal: Friedman

• Between Subjects:

• interval/ratio: Two-Way BS ANOVA

• ordinal: separate Kruskal-Wallis ANOVAs

• nominal: Chi-Square Test of Independence

• Within Subjects:

• interval/ratio: Two-Way RM ANOVA

• ordinal: separate Friedman tests

• Mixed:

• interval/ratio: Mixed ANOVA

• ordinal: separate Kruskal-Wallis ANOVAs

• Two Groups:

• interval/ratio: Independent Samples t

• ordinal: Wilcoxon Rank-Sum

• nominal: Chi-Square Goodness of Fit

• Three or More Groups:

• interval/ratio: One-Way BS ANOVA

• ordinal: Kruskal-Wallis ANOVA

• nominal: Chi-Square Goodness of Fit

• interval/ratio: One-Way RM ANOVA

• ordinal: Friedman

• nominal: Chi-Square Goodness of Fit

• interval/ratio: Mixed ANOVA

• ordinal: separate Kruskal-Wallis ANOVAs

• nominal: separate Chi-Square Goodness of Fit tests

• Two Age Groups:

• interval/ratio: Independent Samples t

• ordinal: Wilcoxon Rank-Sum

• nominal: Chi-Square Goodness of Fit

• Three or More Age Groups:

• interval/ratio: One-Way BS ANOVA

• ordinal: Kruskal-Wallis ANOVA

• nominal: Chi-Square Goodness of Fit

• Two Ages:

• interval/ratio: Dependent Samples t

• ordinal: Wilcoxon T

• Three or More Ages:

• interval/ratio: RM ANOVA

• ordinal: Friedman