How can I calculate the power of my analysis with binary response data?

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Asked 3 years, 6 months ago

Modified 3 years, 6 months ago

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I have three groups with ~ 15 individuals per group.

The response is binary, 1 or 0.

I want to determine the power of my study. I used this calculator but would like a second opinion. Using the terms from that site:

I have:

This gives a sample size of 14 for group 1 and 28 for group 2.

kjetil b halvorsen♦

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asked Nov 27, 2019 at 12:41

adkane

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$\begingroup$ You are using logistic regression? Probable duplicates: stats.stackexchange.com/questions/162294/…, stats.stackexchange.com/questions/35940/…, stats.stackexchange.com/questions/26016/… $\endgroup$
– kjetil b halvorsen ♦
Nov 27, 2019 at 12:58
$\begingroup$ Why do you lump your controls together in the sample size calculations? That should make for an easier problem, so I guess it will underestimate the needed sample size! You also need to specify how do you plan to do the test. $\endgroup$
– kjetil b halvorsen ♦
Nov 27, 2019 at 13:02
$\begingroup$ I group them because neither control gets affected by the treatment. I was thinking of using an Exact test or similar because I am limited by my sample size. $\endgroup$
– adkane
Nov 27, 2019 at 13:05
$\begingroup$ Well, but if the base rate depends on area then that should be accounted for in the analysis $\endgroup$
– kjetil b halvorsen ♦
Nov 27, 2019 at 13:07
$\begingroup$ There are many posts here about power analysis with exact tests: stats.stackexchange.com/search?q=power+exact+test+answers%3A1 $\endgroup$
– kjetil b halvorsen ♦
Nov 27, 2019 at 13:16

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