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Re: GLM vs unbalanced designs
From: |
Jason Stover |
Subject: |
Re: GLM vs unbalanced designs |
Date: |
Tue, 27 Sep 2011 15:53:11 -0400 |
User-agent: |
Mutt/1.5.18 (2008-05-17) |
On Tue, Sep 27, 2011 at 02:02:02PM +0000, John Darrington wrote:
> Does anyone have any ideas about what we need to do different in the face of
> non-equal sample sizes? I've tried the obvious things, like using harmonic
> means instead of arithmetic ones. But so far no luck. And quite why the
> intercept
> should be different, I don't understand.
I'll take a look at it.
>
> J'
>
>
>
> data list notable
> fixed
> /dmethod 1 illum 3 score 5-6.
> begin data.
> 1 1 3
> 1 1 4
> 1 1 6
> 1 1 7
> 1 2 5
> 1 2 6
> 1 2 6
> 1 2 7
> 1 2 7
> 1 3 4
> 1 3 6
> 1 3 8
> 1 3 8
> 1 4 8
> 1 4 10
> 1 4 10
> 1 4 7
> 1 4 11
> 2 1 2
> 2 1 3
> 2 1 4
> 2 2 3
> 2 2 5
> 2 2 6
> 2 2 3
> 2 3 9
> 2 3 12
> 2 3 12
> 2 3 8
> 2 4 9
> 2 4 7
> 2 4 12
> 2 4 11
> end data.
>
> variable labels score 'Accuracy Score'.
>
> glm score by illum dmethod
> /method=sstype(3)
> /intercept=include
> /criteria=alpha(.05)
> /design.
>
>
> Actual Results:
>
>
> Tests of Between-Subjects Effects
> #===============#=======================#==#===========#=======#====#
> # Source #Type III Sum of Squares|df|Mean Square| F |Sig.#
> #===============#=======================#==#===========#=======#====#
> #Corrected Model# 184.250| 7| 26.321| 8.061|.000#
> #Intercept # 1589.121| 1| 1589.121|486.690|.000#
> #illum # 150.592| 3| 50.197| 15.374|.000#
> #dmethod # .113| 1| .113| .035|.854#
> #illum * dmethod# 33.212| 3| 11.071| 3.391|.034#
> #Error # 81.629|25| 3.265| | #
> #Total # 1855.000|33| | | #
> #Corrected Total# 265.879|32| | | #
> #===============#=======================#==#===========#=======#====#
>
>
>
>
> Expected Results:
>
> Tests of Between-Subjects Effects
>
> Dependent Variable: Type III df Mean Square F Sig.
> Accuracy Score Source Sum of Squares
>
> Corrected Model 195.029(b) 7 27.861 9.831 .000
> Intercept 1478.432 1 1478.432 521.677 .000
> ILLUM 158.951 3 52.984 18.696
> .0001
> DMETHOD 6.176E-02 1 6.176E-02 .022 .8842
> ILLUM * DMETHOD 43.991 3 14.664 5.174 .0063
> Error 70.850 25 2.834
>
> Total 1855.000 33
>
> Corrected Total 265.879 32
> --
> PGP Public key ID: 1024D/2DE827B3
> fingerprint = 8797 A26D 0854 2EAB 0285 A290 8A67 719C 2DE8 27B3
> See http://pgp.mit.edu or any PGP keyserver for public key.
>
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