Statistical Power - People.stat.sfu.ca
Statistical Power - People.stat.sfu.ca
Statistical Power - People.stat.sfu.ca
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!Effect: magnitude of response, original units!<br />
increase in fish concentration, 20 fish/m 2 !<br />
!Effect size: standardized effect, percentage!<br />
if sd = 50 fish/m 2 , effect size = 20/50 = 0.4 = 40!<br />
!Effect size (alternate form): pct. difference from mean value!<br />
if mean = 60 fish/m 2 , 72 fish/m 2 = 20% increase!<br />
if mean = 60 fish/m 2 , 45 fish/m 2 = 25% decrease !<br />
!<strong>Power</strong> to detect large effects is always greater <br />
than power to detect small effects.!<br />
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