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Questions and Answers

What is a repeated measure in the context of Repeated Measures ANOVA?

A variable that is measured independently of any intervention or treatment

A variable that is measured only once throughout the study

A variable that is measured at a single time point

A variable measured two or more times, usually before, during and/or after an intervention or treatment (correct)

What is another name for Repeated Measures ANOVA?

Correlated samples ANOVA (correct)

Dependent groups ANOVA

Paired samples ANOVA

Independent groups ANOVA

In what format should the data be set out for Repeated Measures ANOVA?

All units and measures in one row

All units and measures in one column

Each unit in one row and repeated measures in separate columns (correct)

Each unit in separate rows and repeated measures in one column

What type of variables are suitable for Repeated Measures ANOVA?

Interval or ratio level (continuous) variables Signup and view all the answers

What assumption should hold for the dependent variable between the related groups in Repeated Measures ANOVA?

Approximately normally distributed Signup and view all the answers

Which of the following examples best illustrates a repeated measure?

Measuring cholesterol at baseline, 3 months, 6 months, and 12 months in a trial of a new statin Signup and view all the answers

What does Repeated Measures ANOVA determine?

Whether change has occurred over time Signup and view all the answers

In SPSS, what can be carried out after setting out the data in the required format for Repeated Measures ANOVA?

Simple analyses Signup and view all the answers

Which level of measurement is suitable for the variable to be analyzed using Repeated Measures ANOVA?

Interval or ratio level (continuous) Signup and view all the answers

What should hold for the dependent variable between related groups in Repeated Measures ANOVA?

Approximately normally distributed Signup and view all the answers

In what way are repeated measures organized?

Each unit in one row and repeated measures in separate columns Signup and view all the answers

What can outliers in data do to the results of a repeated measures ANOVA?

Distort differences between related groups and reduce accuracy of results Signup and view all the answers

What does the sphericity assumption refer to in a repeated measures ANOVA?

Differences in variances in levels of the repeated measures factor Signup and view all the answers

What does violation of the sphericity assumption increase in a repeated measures ANOVA?

Type I error Signup and view all the answers

What does the denominator of F ratio in a repeated measures ANOVA table include?

Within subjects error and total degrees of freedom Signup and view all the answers

Can repeated measures ANOVA be used with or without a control group?

Yes, it can be used with or without a control group Signup and view all the answers

What provides information on the sums of squares, mean squares, and assumptions in a repeated measures ANOVA?

Tests of Within-Subjects Effects Signup and view all the answers

What do multivariate tests like Mauchly's Test of Sphericity help to test?

The sphericity assumption Signup and view all the answers

When conducting pairwise comparisons in a repeated measures ANOVA, what are you comparing?

Means at different time intervals Signup and view all the answers

What do Multivariate Tests like Pillai's Trace provide for a repeated measures ANOVA?

Effect size information Signup and view all the answers

In a 2-week measurement study with data for seven subjects on three occasions, how many measurements were taken in total?

14 measurements Signup and view all the answers

Study Notes

Repeated Measures ANOVA and Assumptions

Outliers in data can distort differences between related groups and reduce accuracy of results
Sphericity assumption refers to differences in variances in levels of the repeated measures factor
Violation of sphericity assumption increases Type I error; Mauchly's Test of Sphericity can test this assumption
Repeated measures ANOVA tests differences between related population means
Hypotheses for repeated measures ANOVA include testing for differences between population means
Repeated measures ANOVA can be used with or without a control group
Denominator of F ratio in repeated measures ANOVA table includes within subjects error and total degrees of freedom
Example of a 2-week measurement of anxiety scores after treatment, with data for seven subjects on three occasions
Multivariate Tests, such as Mauchly's Test of Sphericity, help to test the sphericity assumption
Tests of Within-Subjects Effects provide information on the sums of squares, mean squares, and assumptions
Pairwise comparisons can be used to compare means at different time intervals
Multivariate Tests, such as Pillai's Trace, provide effect size information for the repeated measures ANOVA.

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Description

Learn the objectives and key concepts of repeated measures ANOVA, including understanding what is meant by repeated measures, setting out data, conducting analyses in SPSS, and interpreting the output. Also known as 'Dependent groups' or 'ANOVA for correlated samples'.