Basic Graphs (POWER, GLMPOWER, Power and Sample Size Application)

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Basic Graphs (POWER, GLMPOWER, Power and Sample Size Application)

If you include a PLOT statement, the GLMPOWER and POWER procedures produce standard power curves, which represent any multivalued
input parameters with varying line styles, symbols, colors, and/or panels. The Power and Sample Size application also has
an option to produce power curves. If ODS Graphics is enabled, then graphs are created using ODS Graphics; otherwise, traditional
graphs are produced.

To display default power curves for the preceding PROC POWER call, add the PLOT statement with no arguments as follows:

ods graphics on;
proc power plotonly;
twosamplemeans test=diff
meandiff = 5 6
stddev = 12 18
alpha = 0.05 0.1
ntotal = 100 200
power = .;
plot;
run;
ods graphics off;

The ODS GRAPHICS ON statement enables ODS Graphics.

Figure 18.2 shows the results. Note that the line style varies by the significance level , the symbol varies by the mean difference, and the panel varies by standard deviation.

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