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Example of finding power of a balanced one way ANOVA:
proc power;
onewayanova test = overall
groupmeans = 59 | 66 | 42
std = 5 8 10 12
npergroup = 3 4 5 6 7 8 9 10
power = . ;
plot ;
run;
Contrast power:
proc power;
onewayanova test = contrast
contrast = (1 -1 0 0 0 0) (0 1 0 0 -1 0) (0 0 1 -1 0 0)
groupmeans = (5 4 6 11 12 9)
std = 4
npergroup = 5
power = .
;
run;
Example of finding n of an unbalanced one way ANOVA:
proc power;
onewayanova test = overall
groupmeans = 3 | 7 | 8
stddev = 4
groupweights = (1 2 2)
npergroup = .
power = 0.8
;
run;
Example of finding power of a chi-squared test:
proc power;
twosamplefreq test = pchi
groupproportions = (.6 .4) (.7 .3) (.55 .45) (.49 .51)
nullproportiondiff = 40
npergroup =25 50 75 100 200
power = . ;
plot;
run;
This post was kindly contributed by SAS & Statistics - go there to comment and to read the full post. |