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Anonymous posted on Saturday, January 08, 2005 - 10:05 am
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I am doing a latent mixture model with 4 classes, defined by 3 measures. In order to look at the differences between classes, I need to change the reference group (class 4). I have tried to enter in the estimates after each class statement, but it seems to be a trial and error process. In fact it seems as if what you put under class 1 determines the order of the rest of the classes. So, I am unsure how to make class 4 the class I want it to be. Any suggesstions would be helpful. |
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bmuthen posted on Saturday, January 08, 2005 - 10:11 am
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The last class often has the largest or smallest thresholds - corresponding to small or large probabilities of item endorsement. So giving high or low starting values for the class 4 thresholds often works. |
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Andrea Mata posted on Wednesday, April 16, 2008 - 4:33 pm
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I am running a four class LCGA model with 9 covariates (6 dichotomous, 3 continous), but I want to change the reference class to a specific latent class instead of the last class. I have written this syntax command: %c#3% underneath the c on "list of all of the covariates" command. However, I do not think it changed the reference group to be class number 3. And if it did, how would I know if it did? Is this the correct syntax? I guess my question is: how do I change the reference group in a conditional LCGA model? |
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You change the reference class by using the estimated parameter values for the class you want to be last as starting values for the last class. |
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I am running a latent profile analysis with three latent profiles and covariates. I am trying to make class 1 the reference group by specifying it as group 3 and starting values as follows: %grp#1% [F20_32*-0.809 F20_23*0.100]; %grp#2% [F20_32*0.328 F20_23*0.472]; %grp#3% [F20_32*0.259 F20_23*-0.457]; However, group 3 keeps coming out as class 2. What could I do to fix this? |
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You can also give starting values for other parameters, for instance [c#1*? c#2*?] |
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