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Modern repeated measures analysis using mixed models in SPSS (2) 

Robin B
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This uses a Repeated measures analyse as an introduction to the Mixed models (random effects) option in SPSS.
Demonstrates different Covariance matrix types & how to use the Likelihood ratio test to evaluate different models.
First an inappropriate standard regression model is developed then one with a random intercept ( considering the patient a level 2 variable) and finally a random intercept+ slope model, each is evaluated using the likelihood ratio test (see previous video for more details on obtaining chi square p value).
The example is from Twisks excellent book - applied multilevel analysis p.91-95 with him using the free package MLWin
Robin Beaumont
for Full notes, MCQ's etc see:
www.robin-beaum...

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15 сен 2024

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Комментарии : 18   
@Pietromans
@Pietromans 11 лет назад
4:20 to 4:32: isn't it just the opposite? If the independent variable (lifestyle) goes up by one, the dependent variable (health) goes up by 0,14?
@jocelynarbuthnott3221
@jocelynarbuthnott3221 11 лет назад
Hi thank you! I have found this very helpful. Do you know if there is anywhere that demonstrates how to distinguish between and within effects? you mentioned there are ways but you would not go into it for this video, unfortunately have so far not found anything to demonstrate how this is done on spss?...
@RobinBeaumont
@RobinBeaumont 12 лет назад
A difficult question - to really understand what is going on you need to understand the matrix algebra underneath it basically I suggest you look carefully at the pdf handouts that go along with this video and also the next pdf concerned with 5 repeated measures in 2 treatment groups page 18 you can see a link to it from the link mentioned in the video title
@kangma4462
@kangma4462 4 года назад
Thanks so much for the video. While i noticed the Unstructured correlation between Intercept and Slopes, May i ask what's the evidence for this correlation?
@rebeccadcruz4356
@rebeccadcruz4356 3 года назад
Fantastic video - thank you! Very helpful
@RobinBeaumont
@RobinBeaumont 11 лет назад
Thanks for the comment Pieter will check when I get a moment
@nikkijahanfar
@nikkijahanfar 10 лет назад
Hi Robin, I really enjoyed this presentation. I wonder if we can use mixed models for twin data as twins as clusters. Or do you prefer the GEE model. Can you please let me know which one is suitable when we are interested in individual outcomes, but we are concerned with within-twin correlation. Thanks
@petsol
@petsol 11 лет назад
I'd like to know that as well: I thought the between effect is in fact "sucked up" by the random intercept, but the video tells it hasnt. Maybe modelling with a subject average and a RM diff from that subj average would help to model distinctively, but I thought that is done automaticaly by SPSS.
@Tomahawk1999
@Tomahawk1999 12 лет назад
hello sir, how do you decide which variable goes in factors and which in covariates? could you please help me understand? thanks a lot
@TheHotHamster
@TheHotHamster 7 лет назад
Hey Robin, sorry I am not an expert, but at 4:32 you say that the parameter of lifestyle .14 means that when you have a one unit change in health you have a .14 change in lifestyle. But isn't it the other way around? Isn't it the unstandardized regression coefficient (slope) which indicates how much the estimated regression line increases at the criterion level when the predictor changes with one unit? Would very much appreciate an answer :) Lisa
@TheHotHamster
@TheHotHamster 7 лет назад
Ok, I am the second one who comments about that.. didn't see that ;)
@angelomark6653
@angelomark6653 8 лет назад
I get an error that the number of observations exceeds of less than the number of parameters. What exactly does this mean?
@BreakTheRules2011
@BreakTheRules2011 4 года назад
I believe that this means that you have exhausted your degrees of freedom.
@RobinBeaumont
@RobinBeaumont 12 лет назад
Factor or covariates - Many people have problems with the factor/covariate box here, you are in good company see andy field's Discovering statistics using SPSS 3rd ed. page 744
@ArcadianGenesis
@ArcadianGenesis 12 лет назад
1) Are you saying "SPSSS"? Why the fourth S? 2) That is a really noisy mouse.
@arucardmaster
@arucardmaster 12 лет назад
Anyone can speak American English that can teach us?
@minxialuo498
@minxialuo498 8 лет назад
Thanks for the explanation! It's good!
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