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Description

DECISION TREE: WHICH STATISTICAL TEST? GOAL 1: Comparison of 2 Groups

Independent Groups

Dependent Groups

Ratio or Interval Data

Normal Distribution

Paired ttest

Ordinal Data

Non-Normal Distribution

Ordinal Data

Ratio or Interval Data

Normal Distribution

Nominal Data

Non-Normal Distribution

MannWhitney U test

Wilcoxon Signed Rank test

Independent t-test

Independent z-test

DECISION TREE: WHICH STATISTICAL TEST (CONT’D)? 1

Chi-square test (Fisher’s or Yates if at least 20% of cells have expected frequencies < 5)

GOAL 2: Comparison of 3 or More Groups

Ratio or Interval Data

Normal Distribution

One-way ANOVA

Nominal Data

Ordinal Data

Non-Normal Distribution

Chi-square test (Fisher’s or Yates if at least 20% of cells have expected frequencies < 5)

KruskalWallis test

2

DECISION TREE: WHICH STATISTICAL TEST (CONT’D)? GOAL 3: Examine Relationship Between 2 Variables

Nominal Data (Counts - e.g., 2x2, 5x2 tables)

Ratio, Interval or Ordinal Data

Prediction (Functional Form) of Relationship

Strength of Relationship

Ratio or Interval Variables

Normal Distribution, Linear

Pearson Correlation Coefficient

Ordinal Variables

Non-Normal Distribution

Spearman Correlation Coefficient (briefly discussed)

Ratio or Interval Variables

Normal Distribution, Linear

-Simple Linear Regression -Multiple Regression

3

Statistical Significance of Relationship

Chi-square test (Fisher’s or Yates if at least 20% of cells have expected frequencies < 5)

Strength of Relationship

2 x 2 Table

RR, OR...