## (ASK) calculate an Effect Size with a complex model

husseins
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### (ASK) calculate an Effect Size with a complex model

Hi guys,

I am trying to measure effect size f2 for my model. However, my model is a bit confusing since it has one independent variable and two dependent variable

in this model X2 affects X3 and Y. So how I could calculate f^2 of X2? since the formulation is = R^2 include - R^2 Exclude/ 1 - R^2 include.

Construct X2 contributes two R^2. One R^2 for X3 and R^2 for Y. So if I exclude X2, the amount of R^2 X3 and Y are changed. Can be seen from the model I attached.

Please advise me how to calculate f2 for this kind of model.
( this is not real my model and data..but the case is similar with this)
christian.nitzl
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Dear Ananda,

The problem do you have is quickly resolved.

You calculate the effect size f^2 always for a specific connection in your path model. In your case that means you have to calculate the effect size of X2 on X3 and on Y also. Thereafter you have two effect sizes. There is not a effect size X2 for itself.

Best,

Christian
Eva Sch
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Dear Christian,

given the model above: If you calculate f2 for X3 on Y does X1 (which has a direct path to both X2 and X3) have to remain in or be deleted from the model?

Thank you very much!
Eva
christian.nitzl
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Yes, X1 have to remain in the model.

Cheers,

Christian
Eva Sch
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Thank you, Christian!