Yes, you need to assess model fit before you even start addressing the two group analysis. You will have a model fit statistic for each group that needs to be presented
Is this similar to multilevel SEM? Would you be able to use a similar method to adjust for clustering, ie. divide the data by country and compare the model between countries? If not, do you have a video on this?
So the downside of AMOS is multi-level modeling is not part of the package. The best software to use for that is MPLUS. AMOS just can not do multi-level analysis. Saying that, you could do a two group analysis across countries. That is not really "multi-level". Those are different entities. Multi-level would be like measuring managers and employees from a single organization. Hope that helps.
If it is not separate groups, then you will need to dummy code the data into groups (1,0). You will then run the analysis with the dummy coded variable as the two groups. Hope this helps.
My structural model fits (with all the data). However, when I run a group analysis the Amos output message is "iterations limit reached, the results that follow therefore are incorrect". is there anyway I can fix this? . Please a second question, what happens when one of my constrains ends up in a model that does not fit , Amos wont stimate the chi-square results, how can I assess if the difference is significant or not for those cases?
There are a lot of reason for an iteration limit....if I am taking my best guess, you have multicollinearity in your model. Look for the two unobserved variables that are highly correlated with one another. You may have so much overlap that AMOS can not get a unique solution
It gets way more complicated with three groups because you can not analyze them all at once because AMOS will just denote if differences exist within all three groups at the same time....that does not really tell you much. If you have 3 groups (A, B, C), you will need to run a two group between A and B, then B and C, and finally A and C. That is not ideal but it is what is required to find the specific differences across the groups.
Thanking for doing this.
Thank you for the video. I also have the book (thanks!) I was wondering if, for doing group analysis, the model should first fit?
Yes, you need to assess model fit before you even start addressing the two group analysis. You will have a model fit statistic for each group that needs to be presented
Thanks
I have question
If the data is non normal is cootect to use with multigroup bootstrap method?
yes, you will need to bootstrap the data if it is non-normal. Especially if both groups are non-normal.
Is this similar to multilevel SEM? Would you be able to use a similar method to adjust for clustering, ie. divide the data by country and compare the model between countries? If not, do you have a video on this?
So the downside of AMOS is multi-level modeling is not part of the package. The best software to use for that is MPLUS. AMOS just can not do multi-level analysis. Saying that, you could do a two group analysis across countries. That is not really "multi-level". Those are different entities. Multi-level would be like measuring managers and employees from a single organization. Hope that helps.
Hi! How do we perform SEM/PA with within subjects design? How do we illustrate that the relantionships are within-subjects?
If it is not separate groups, then you will need to dummy code the data into groups (1,0). You will then run the analysis with the dummy coded variable as the two groups. Hope this helps.
My structural model fits (with all the data). However, when I run a group analysis the Amos output message is "iterations limit reached, the results that follow therefore are incorrect". is there anyway I can fix this? . Please a second question, what happens when one of my constrains ends up in a model that does not fit , Amos wont stimate the chi-square results, how can I assess if the difference is significant or not for those cases?
There are a lot of reason for an iteration limit....if I am taking my best guess, you have multicollinearity in your model. Look for the two unobserved variables that are highly correlated with one another. You may have so much overlap that AMOS can not get a unique solution
@@joelcollier9387 thank you!
Hi! thanks! Why shouldn't we have a box for the group in the model's squeme ?
Not sure what you mean...can you clarify your question
Thank for the video. How to do follow up analysis if there is a three group?
It gets way more complicated with three groups because you can not analyze them all at once because AMOS will just denote if differences exist within all three groups at the same time....that does not really tell you much. If you have 3 groups (A, B, C), you will need to run a two group between A and B, then B and C, and finally A and C. That is not ideal but it is what is required to find the specific differences across the groups.
@@joelcollier9387 Thanks for the information
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