PLOT Subcommand (POWER MEANS INDEPENDENT command)

The optional PLOT subcommand controls the output charts. By default, no charts are created. When the subcommand is specified, only the outputs for the following keywords are created.

NRATIO(value1 value2)

The optional keyword controls the two-dimensional power by sample size ratio chart. By default, the chart is suppressed. If specified, the chart will be displayed. When no integers are specified, the default plot range of the sample size ratio is used (depending on whether the group variances are assumed to be equal or not). When the keyword is specified, the plot boundaries are determined by value1 and value2, respectively. Both value1 and value2 are numeric values, separated by a blank space (or blank spaces), and must satisfy 0.2 ≤ value1 < value2 ≤ 5.0. You can either omit or specify both numeric values.

ES(value1 value2)

The optional keyword controls the two-dimensional power by effect size (or mean difference) chart. The chart is suppressed by default. When the keyword is specified, the chart displays. When no values are specified, the default plot range of the effect size (or mean difference) is used, depending wither the group variances are assumed to be equal or not. When values are specified, the plot boundaries are determined by value1 and value2, respectively. Both value1 and value2 are numeric values, separated by a blank space (or blank spaces). For the equal group variances, it must satisfy −5.0 ≤ value1 < value2 ≤ 5.0 when /CRITERIA TEST = DIRECTIONAL, or 0 ≤ value1 < value2 ≤ 5.0 when /CRITERIA TEST = NONDIRECTIONAL. For the unequal group variances, it must satisfy 0 ≤ value1 < value2 ≤ 5000. You can either omit or specify both numeric values.

TOTAL_N

The optional keyword is valid only when a range of POWER values is specified. The keyword is ignored when either a single POWER value is specified or /PARAMETERS specifies N. For each integer N displayed in the TOTAL_N plot, N1 and N2 are defined as N1=N/(1+R), N2=(N*R)/(1+R), where R=NRATIO. Note that for each integer N, N1 and/or N2 may be fractional. N_min and N_max are nevertheless computed from P_min and P_max.

NRATIO_XAXIS(integer1 integer2) ES_YAXIS(value1 value2)

The optional keyword controls the three-dimensional power by sample size (x-axis) and effect size (y-axis) chart. The chart is suppressed by default. When the keyword is specified, the chart displays.

Note: value1 and value2 follow the same rules as specified for NRATIO and ES.

NRATIO_YAXIS(integer1 integer2) ES_XAXIS(value1 value2)

The optional keyword controls the three-dimensional power by sample size (y-axis) and effect size (x-axis) chart. The chart is suppressed by default. When the keyword is specified, the chart displays.

Note: value1 and value2 follow the same rules as specified for NRATIO and ES.

VROTATE(integer)

The optional keyword sets the vertical rotation degrees (clockwise from the left) for the three-dimensional chart. The keyword takes effect when the three-dimensional plot is requested. The value must be a single integer ∈[0,359] with 10 as the default setting.

HROTATE(integer)

The optional keyword sets the horizontal rotation degrees (clockwise from the front) for the three-dimensional chart. The keyword takes effect when the three-dimensional plot is requested. The value must be a single integer ∈[0,359] with 325 as the default setting.