Author Topic: wle (or mle, eap) estimates using existing item parameters  (Read 184 times)

furonggao

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wle (or mle, eap) estimates using existing item parameters
« on: April 19, 2019, 06:25:29 PM »
Hi,

Is there a way to let ConQuest estimates wle for cases with already (previously) estimated .prm files, without re-estimating the item parameters? If you have done so, would you mind sharing the commands you used to do this? thanks much!

Sincerely,
Furong Gao

dan_c

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Re: wle (or mle, eap) estimates using existing item parameters
« Reply #1 on: April 22, 2019, 08:34:23 AM »
by ".prn" files, do you mean exported item parameters, created using the "export" command?

https://conquestcommandref.netlify.com/commands.html#export

If so, yes, you can read in item parameters and use them as starting values or anchors using the "import" command. See:

https://conquestcommandref.netlify.com/commands.html#import

Remember that the item parameters exported are only those that are estimated. If you use the item constraint to identify your model, you're exported parameters will exclude the last item (which is the negative sum of the other items).

Another approach is to save the current state of conquest in a system file using the command "put". If you estimate a model, then write a system file, you can later read that system file back in and you won't need to re-estimate the model/calculate fit/gereate case estimates etc.

https://conquestcommandref.netlify.com/commands.html#put
https://conquestcommandref.netlify.com/commands.html#get

If you write a system file and also use R, you can read it into R using the conquestr library:

https://cran.r-project.org/package=conquestr

furonggao

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Re: wle (or mle, eap) estimates using existing item parameters
« Reply #2 on: April 24, 2019, 05:13:15 AM »
Thank you so much, Dan! This is very helpful!!

Sincerely,
Furong Gao