Should I use the Friedman test to compare the means?

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r4ch3l
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Joined: Sat Aug 01, 2015 10:51 am

Should I use the Friedman test to compare the means?

Postby r4ch3l » Sat Aug 01, 2015 11:01 am

I want to compare the mean scores of 8 different variables of the work environment (as in the bar chart attached).
Each variable was computed using the mean scores of 5 items each from a questionnaire using a Likert.

I would like to compare whether the difference in the means of each variable is significant? Do I need to use Friedman's test?
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GerineL
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Re: Should I use the Friedman test to compare the means?

Postby GerineL » Sun Aug 02, 2015 10:09 am

Dependent on your data, you could use the friedman test or an anova. If you meet the assumptions for anova (e.g., independence of observations between your 8 groups, normal distribution etc) you can go for anova, Friedman is the nonparametric alternative.

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