Table 8 

Power for univariate and multivariate tests 

Sample size required for 80% power 



Mx 
NQuery 



Test that x → y1 = 0 (univariate) (df = 1) 
28 
26 
Multivariate test (df = 3) 
14 
Note 1 


Notes: 1 Power for a multivariate test cannot be calculated using standard software. 

Miles BMC Medical Research Methodology 2003 3:27 doi:10.1186/14712288327 