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PSPP-BUG: Incorrect main effect Type III sum of squares in GLM as two-wa


From: Jerome Colburn
Subject: PSPP-BUG: Incorrect main effect Type III sum of squares in GLM as two-way ANOVA
Date: Wed, 28 Nov 2018 19:22:31 -0600
User-agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:60.0) Gecko/20100101 Thunderbird/60.3.1

Running GNU pspp 1.0.1-g818227 on Windows 7 Professional Service Pack 1, AMD Athlon II X4 640, I execute

GLM FitnessScore BY  Gender Diet.

on the attached file. The Type III sum of squares for the main effect of Gender appears as 1.91, whereas the exact value is 0.025, which SSTYPE(1) and SSTYPE(2) get correctly. The other SS values appear to be correct, including those for the corrected model and the error.

Hoping this is helpful,

Jerome Colburn

Attachment: data2.sav
Description: application/spss-sav


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