A SYSTEM FOR CHOOSING STATISTICS

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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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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
• How spread out are the scores?
• interval/ratio: standard deviation
Type of Design: Correlational
• 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.
Type of Design: Experimental, Between Subjects
• Two Groups:
• interval/ratio: Independent Samples t
• ordinal: Wilcoxon Rank-Sum
• nominal: Chi-Square Goodness of Fit
Type of Design: Experimental, Between Subjects
• 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
Type of Design: Factorial, Two Independent Variables
• Between Subjects:
• interval/ratio: Two-Way BS ANOVA
• ordinal: separate Kruskal-Wallis ANOVAs
• nominal: Chi-Square Test of Independence
Type of Design: Factorial, Two Independent Variables
• Within Subjects:
• interval/ratio: Two-Way RM ANOVA
• ordinal: separate Friedman tests
Type of Design: Factorial, Two Independent Variables
• 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
Type of Design: Interrupted Time Series
• interval/ratio: One-Way RM ANOVA
• ordinal: Friedman
• nominal: Chi-Square Goodness of Fit
Type of Design: Multiple Time Series
• interval/ratio: Mixed ANOVA
• ordinal: separate Kruskal-Wallis ANOVAs
• nominal: separate Chi-Square Goodness of Fit tests
Type of Design: Cross-Sectional
• Two Age Groups:
• interval/ratio: Independent Samples t
• ordinal: Wilcoxon Rank-Sum
• nominal: Chi-Square Goodness of Fit
Type of Design: Cross-Sectional
• Three or More Age Groups:
• interval/ratio: One-Way BS ANOVA
• ordinal: Kruskal-Wallis ANOVA
• nominal: Chi-Square Goodness of Fit
Type of Design: Longitudinal
• Two Ages:
• interval/ratio: Dependent Samples t
• ordinal: Wilcoxon T
Type of Design: Longitudinal
• Three or More Ages:
• interval/ratio: RM ANOVA
• ordinal: Friedman