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reffectconfidence-interval
Mathias
Mathias

Reputation: 47

eta-squared outside its 90% confidence intervals?

I have something in between a statistics and R question. I ran a repeated-measures ANOVA with the R package ezANOVA. This package automatically provides eta-squared effect sizes. Furthermore, I'd like to report 90% Confidence Intervals and found a great way to calculate these here: http://daniellakens.blogspot.de/2014/06/calculating-confidence-intervals-for.html

However, some of my effect sizes appear to be outside of these confidence intervals, e.g.: 

F(2, 730) = 20.20, p < .001, eta-squared = .00, 90% CI [.03, .08], 
F(2, 730) = 45.46, p < .001, eta-squared = .05, 90% CI [.08, .15]

These are effect sizes of within-subjects factors (see the second way in Laken's blog post).

Here's my question: Is this statistically possible? And if not, where could be the problem?

Thanks and best, Mathias

Upvotes: 0

Views: 466

Answers (1)

Mathias
Mathias

Reputation: 47

The answer is that the ezANOVA calculates the generalized eta squared, while the confidence intervals were calculated for the partial eta squared.

Upvotes: 1

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