ANOVA (analysis of variance) tests if 3+ population means are all equal.

Example: do the pupils of schools A, B and C have equal mean IQ scores?

This super simple introduction quickly walks you through the basics such as assumptions, null hypothesis and post hoc tests.

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SPSS One-Way ANOVA tests whether the means on a metric variable for three or more groups of cases are all equal. The groups of cases are identified by a categorical variable.

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Post hoc tests in ANOVA test if the difference between each possible pair of means is statistically significant.

This step-by-step tutorial quickly walks you through the entire procedure.

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In SPSS, you can run a one-way ANOVA without the actual data if you have sample sizes, means and SD’s.

The output may include post-hoc tests, effect sizes and power but not Levene's test or any normality tests.

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Levene’s test examines if 2+ populations have equal variances on some variable.

This condition -known as the homogeneity of variance assumption- is required by t-tests and ANOVA.

So how to run and interpret this test in SPSS? This simple tutorial quickly walks you through.

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If Levene’s test is “Significant“ for an ANOVA, the Welch and Games-Howell tests are good alternatives.

This tutorial quickly walks you through these analyses.

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In ANOVA and regression, an interaction effect means that some effect depends on another variable.

Example: women become happier but men become *un*happier if they have children. So the effect of having children depends on sex.

This tutorial walks you through testing for and interpreting interaction effects in ANOVA.

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Run your SPSS two way ANOVA the right way in 5 simple steps. With downloadable data file, enhanced screenshots and annotated output.

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Repeated measures ANOVA tests if 3+ variables have equal means in some population.

Example: are the mean scores on IQ tests A, B and C equal for all Dutch children?

This simple introduction quickly walks you through the basics.

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SPSS Repeated measures ANOVA is a procedure for testing whether the means of 3 or more metric variables are equal. These variables have been measured on the same cases.

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This step-by-step tutorial walks you through a repeated measures ANOVA with a within and a between-subjects factor in SPSS. Covers post hoc tests and the interaction effect as well.

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SPSS Repeated Measures ANOVA - 2 Within-Subjects Factors

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(Partial) eta squared is an effect size measure for one-way or factorial ANOVA. This tutorial shows 2 easy ways to get it from SPSS.

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The variance is a number that indicates how far a set of numbers lie apart. This tutorial explains the concept gently with examples and illustrations.

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ANCOVA (analysis of covariance) tests if 2+ population means are equal while controlling for 1+ background variables.

Example: do medicines A, B and C result in equal mean blood pressures when controlling for age?

ANCOVA basically combines ANOVA and regression. This tutorial walks you through the analysis with an example in SPSS.

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## THIS TUTORIAL HAS 6 COMMENTS:

## By Abdulkadir Mudiyu on October 22nd, 2023

Please I am a student of poor mathematics knowledge can you please help me to become a very good in statstics. Thank you.