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Thread: GLM contrast table mystry

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    GLM contrast table mystry




    Dear Colleagues
    I hope you are all fine
    I ran a repeated measures analysis with two independent variables each with three levels

    at first I converted the two variables I have into the 9 new variables (level1 var1 + level 1 var 2, level 1 var1+ level 2 var 2, so on). I hope this is correct.

    The contrast output (simple contrast) contained strange expression containing E- beside the numbers (see below) and this was only at some levels of the interaction term, the rest of the table is OK
    What could be the reason behind this knowing that I checked the completeness of data in the table

    Please copy a response to my email (dr_mohamedbekheit@hotmail.com)
    I appreciate every insightful idea that come on an urgent wave

    Tests of Within-Subjects Contrasts
    Measure: MEASURE_1

    Level 2 vs. Level 3 7.451E-009 1 7.451E-009 . . 1.000
    Error(Liver_volume*Spleen_volume) Level 1 vs. Level 3 Level 1 vs. Level 3 1396375.733 14 99741.124
    Level 2 vs. Level 3 1396375.733 14 99741.124
    Level 2 vs. Level 3 Level 1 vs. Level 3 1.863E-009 14 1.330E-010
    Level 2 vs. Level 3 .000 14 .000

  2. #2
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    Re: GLM contrast table mystry


    The E is for "exponential notation".

    See here:

    http://slc.umd.umich.edu/slconline/WRIT/index.html
    The earth is round: P<0.05

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