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SPSS - Power analysis issue bug?

  • 1.  SPSS - Power analysis issue bug?

    Posted Tue August 30, 2022 04:56 PM
    Hi, 

    I'm trying to figure out the Power Analysis module in SPSS 28 and I can't understand what the power plot represents. It seems to give different results compared to the power analysis itself.

    For example, the command below indicates that the design has 0.928 power to detect an effect size of 0.5. However, in the power by Effect size plot the 0.5 effect size is at < 0.8 power. Is this a bug or am I missing something?

    Thanks!

    POWER MEANS INDEPENDENT
    /PARAMETERS TEST=NONDIRECTIONAL SIGNIFICANCE=0.05 N=90 100 MEAN=0.5 SD=1
     /PLOT ES(0.1 2).

    power1
    power2


    ------------------------------
    Michel-Pierre Coll
    ------------------------------

    #SPSSStatistics


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