POWER ONEWAY ANOVA

POWER ONEWAY ANOVA is available in IBM® SPSS® Statistics Base Edition. The procedure estimates the power for two types of hypothesis to compare the multiple group means, the overall test, and the test with specified contrasts. The over test focuses on the null hypothesis that all group means are equal. The test with specified contrasts breaks down the overall ANOVA hypotheses into smaller but more describable and useful pieces of the means.

POWER ONEWAY ANOVA
     /PARAMETERS
          [ SIGNIFICANCE={0.05**} {value}] ]
          { GROUP_SIZES={integers} }
          { POWER=[value] | [value1 TO value2 BY value3] }
          { POOLED_SD={value GROUP_MEANS={values}
          { ES={F({value})} {ETA_SQUARED({value})} }
          [ GROUP_WEIGHTS={EQUAL**} {values} ]
     [ /CONTRAST
          [ COEFFICIENTS={values}]
          [ TEST={NONDIRECTIONAL**} {DIRECTIONAL}]
          [ PAIRWISE={FALSE**} {TRUE}]
          [ ADJUST={BONFERRONI**} {SIDAK} {LSD}] ]
          [ HALFWIDTH={values} ]
          [ ES={value} ]
     [ /PLOT
          [ TOTAL_N([integer1 integer2]) ]
          [ POOLED_SD([value1 value2]) ]
          [ TOTAL_N_XAXIS([integer1 integer2]) POOLED_SD_YAXIS([value1 value2]) ]
          [ TOTAL_N_YAXIS([integer1 integer2]) POOLED_SD_XAXIS([value1 value2]) ]
          [ ES([value1 value2]) ]
          [ TOTAL_N_XAXIS([integer1 integer2]) ES_YAXIS([value1 value2]) ]
          [ TOTAL_N_YAXIS([integer1 integer2]) ES_XAXIS([value1 value2]) ] 
]

** Default if the subcommand or keyword is omitted.

This command reads the active dataset and causes execution of any pending commands. See the topic Command Order for more information.

Syntax for the POWER ONEWAY ANOVA command can be generated from the Power Analysis of One-Way ANOVA dialog.

Release History

Release 28.0.1

• Added support for the PARAMETERS subcommand's ES and ETA_SQUARED keywords.
• Added support for the CONTRAST subcommand's HALFWIDTH and ES keywords.
• Added support for the PLOT subcommand's ES, ES_YAXIS, and ES_XAXIS keywords.

Release 28.0

• PARAMETERS subcommand's POWER keyword supports [value1 TO value2 BY value3].