How to use G*power to calculate sample size when multiple regression model is employed for secondary data. One dependent variable (Y), one Independent variable (IV), and five control variables. The following regression model is employed.
Yit=β0+β1(IV)+ β2(Control Variable 1)+ β2(Control Variable 1)+ β3(Control Variable 2)+ β4(Control Variable 3)+ β5(Control Variable 4)+ β6(Control Variable 5)+εit
Hello! You may use the method for sample size calculation using the power analysis module within the gpower. please find the detailed technique here https://stats.idre.ucla.edu/other/gpower/multiple-regression-power-analysis/
it seems that you have already acquired your (secondary)data. If so the sample size is your number of observations. The power is now fixed but unknown and hence doesn't matter. HTHs .If I have misunderstood your question, please try again. Best, D. Booth
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