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kjetil b halvorsen
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Tim
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I have my2pl as ltm data and my3pl as tpm data.
anova(my2pl,my3pl) Likelihood Ratio Table AIC BIC log.Lik LRT df p.value my2pl 16317.52 16630.39 -8078.76 my3pl 16299.71 16769.00 -8029.85 97.81 40 <0.001
Shall

anova(my2pl,my3pl)  
Likelihood Ratio Table  
AIC      BIC  log.Lik   LRT df p.value  
my2pl 16317.52 16630.39 -8078.76                   
my3pl 16299.71 16769.00 -8029.85 97.81 40  <0.001  

Shall I use ltm or tpm model based on this anova?

I have my2pl as ltm data and my3pl as tpm data.
anova(my2pl,my3pl) Likelihood Ratio Table AIC BIC log.Lik LRT df p.value my2pl 16317.52 16630.39 -8078.76 my3pl 16299.71 16769.00 -8029.85 97.81 40 <0.001
Shall I use ltm or tpm model based on this anova?

I have my2pl as ltm data and my3pl as tpm data.

anova(my2pl,my3pl)  
Likelihood Ratio Table  
AIC      BIC  log.Lik   LRT df p.value  
my2pl 16317.52 16630.39 -8078.76                   
my3pl 16299.71 16769.00 -8029.85 97.81 40  <0.001  

Shall I use ltm or tpm model based on this anova?

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kittygirl
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how to select IRT model based on anova?

I have my2pl as ltm data and my3pl as tpm data.
anova(my2pl,my3pl) Likelihood Ratio Table AIC BIC log.Lik LRT df p.value my2pl 16317.52 16630.39 -8078.76 my3pl 16299.71 16769.00 -8029.85 97.81 40 <0.001
Shall I use ltm or tpm model based on this anova?