SPSS repeated measures ANOVA tests if the means of 3 or more metric variables are all equal in some population.

The simplest repeated measures ANOVA involves 3 outcome variables, all measured on 1 group of cases (often people). Whatever distinguishes these variables (sometimes just the time of measurement) is the **within-subjects factor**.

SPSS

Analyze - General Linear Model - Repeated Measuers

1. We may freely choose a name for our **within-subjects factor**.

2. We may also choose a name for our **measure**: whatever each of the four variables is supposed to reflect.

3. We now select all four variables and move them to the *W*ithin-subjects variables box with the arrow to the right.

4. Under *O*ptions we'll select *D*escriptive statistics.

5. Clicking *P*aste results in the syntax below.

## Repeated Measures ANOVA Output - Mauchly’s Test

We now turn to Mauchly's test for the sphericity assumption. As a rule of thumb, **sphericity is assumed if Sig. > 0.05**.

## Repeated Measures ANOVA Output - Within-Subjects Effects

Since our data seem spherical, we'll ignore the Greenhouse-Geisser, Huynh-Feldt and lower bound results in the table below. We'll simply interpret the uncorrected results denoted as “**Sphericity Assumed**”.

## Reporting the Measures ANOVA Result

When reporting a basic repeated-measures ANOVA, we usually report

- the
**descriptive statistics**table - the outcome of
**Mauchly's test**and - the outcome of the
**within-subjects tests**.

#### 'Statistics' 카테고리의 다른 글

Mauchly's Test of Sphericity with Repeated Measures ANOVA in SPSS (0) | 2019.12.17 |
---|---|

Power analysis and Sample Size calculator (0) | 2019.12.14 |

Repeated Measures ANOVA (Definition) (0) | 2019.10.29 |

Statistics Calculator - DanielSoper.com (0) | 2019.10.05 |

Anova SPSS Handouts (0) | 2019.10.02 |