Re: [EXTERNAL] SPSSX-L Digest - 19 Jul 2019 to 20 Jul 2019 (#2019-153)

[stachulajohnp]

  :,,'

Sent from my Sprint Samsung Galaxy S8.

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From: SPoSSX-L automatic digest system <[hidden email]>

Date: 7/20/19 11:00 PM (GMT-06:00)

To: [hidden email]

Subject: [EXTERNAL] SPSSX-L Digest - 19 Jul 2019 to 20 Jul 2019 (#2019-153)

There are 3 messages totaling 110 lines in this issue.

Topics of the day:

  1. doubly-entry data structure (2)
  2. How to model interaction between time of the day (on many different days)
     and group effect in linear mixed model

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Date:    Fri, 19 Jul 2019 23:11:04 -0700
From:    Empi <[hidden email]>
Subject: Re: doubly-entry data structure

Bruce - exactly the code I needed, thank you very much !!!



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Date:    Fri, 19 Jul 2019 23:21:20 -0700
From:    Empi <[hidden email]>
Subject: Re: doubly-entry data structure

...Kirill, thank you for your support - and your macro-compilation is a
treasure trove, didn't know it before...
Best
E.



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Date:    Sat, 20 Jul 2019 05:56:21 -0700
From:    jdube <[hidden email]>
Subject: How to model interaction between time of the day (on many different days) and group effect in linear mixed model

Hello all,

Just new to this forum/ML, which seems great to encourage collaboration
between SPSS users (and between expert-non experts).

For my self, I am starting with linear mixed models and trying to specify
the syntax for the model I have in mind. I'm not sure if I'm syntax is
correct and if it the best for my model. Any help would be appreciated. I am
using SPSS 25 on Windows.

As for the model, I have around 20 animals (in 2 age groups) with measures
of brain activity across 12h periods (12 time-points) for a variable number
(between 8 and 31) per animal. I am interested in modelling an interaction
between age and hour (I expect age effect at specific hours but not others).
In my understanding of things, I have two random factors: 1) the days where
the recording took place and 2) the animals which participated. As for my
fixed factor, I see 1) time of the day and 2) age group. Time of the day is
a repeated measures but do not seem random to me as these points are
deliberately fixed.

My retained syntax is below. I am using an autoregressive covariance
structure as I expect high correlation between contiguous data point in the
time domain.

MIXED Variable BY Agegroup Day Hour
  /CRITERIA=CIN(95) MXITER(100) MXSTEP(10) SCORING(1)
SINGULAR(0.000000000001) HCONVERGE(0,
    ABSOLUTE) LCONVERGE(0, ABSOLUTE) PCONVERGE(0.000001, ABSOLUTE)
  /FIXED=Agegroup Hour Agegroup*Hour | SSTYPE(3)
  /METHOD=REML
  /RANDOM=INTERCEPT Day | SUBJECT(animal) COVTYPE(VC) SOLUTION
  /REPEATED=Hour*Day | SUBJECT(animal) COVTYPE(ARH1).

Any thoughts regarding the model (choices of random and fixed factors) and
syntax would be appreciated!
Thank you all !



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End of SPSSX-L Digest - 19 Jul 2019 to 20 Jul 2019 (#2019-153)
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