Sample size to study correlation

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Hello Sir,

For calculating the sample size to do the correlation studies here is the formula

N= [(z1-α/2 + z1-β) / |z’r0 – z’r1|]2 + 3

where,

Information required

POWER: probability of detecting a true effect

ALPHA: probability of detecting a false effect (two sided: double this if you need one sided)

R0: correlation coefficient under the null hypothesis (often 0)

R1: correlation coefficient under the alternative hypothesis

I am attaching the reference document and explanation for the derivation of this formula.

Sir, I could not found anything simpler than this. It will be definitely welcome to hear from NetRUMians if anyone would come up with more information.

Regards,

Dr Smita Mali

1 of 1 File(s)

Sample size (correlation studies).doc