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I have all other R Square values above 0.6 except for one item which has a small R Square value of 0.05.

Is there any journal papers published that can help explain and justify the acceptance of a small R Square value?

Please advise.

Thank you.

Problem solved.

I used G*Power to calculate the total sample size required based on the statistical power that I need.

Dear Clemen,

Would you please advise, how did you justified/explained small R^2 by means of calculating statistical power?
Thank you very much.

Larissa