Author Topic: problem with combined item difficulty map  (Read 202 times)

cucho_veas

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problem with combined item difficulty map
« on: September 19, 2018, 04:07:37 PM »
Hi everyone!

I'm trying to run a 6-factor scale using multidimensional rating scale model; however, when I select the option Table Combined Item Difficulty Map, it only appears the distribution of the items. At the left space, appears "case estimate not requested". Did I make something wrong? My command is:

Datafile XXXX;
Title XXXX;
Format id 32-34 responses 1-30;
codes 0,1,2,3;
score (0,1,2,3) (0,1,2,3) () () () () () !items (2,4,12,16,19);
score (0,1,2,3) () (0,1,2,3) () () () () !items (8,17,23,26,27);
score (0,1,2,3) () () (0,1,2,3) () () () !items (13,20,22,25,29);
score (0,1,2,3) () () () (0,1,2,3) () () !items (3,5,10,11,30);
score (0,1,2,3) () () () () (0,1,2,3) () !items (1,7,14,18,24);
score (0,1,2,3) () () () () () (0,1,2,3) !items (6,9,15,21,28);
Model item+step;
Estimate !method=Montecarlo, nodes =2500, converge =.005

dan_c

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Re: problem with combined item difficulty map
« Reply #1 on: September 20, 2018, 12:49:00 AM »
check out the command reference:

https://www.acer.org/files/Command-Reference.pdf

Code: [Select]
abilities=reply

If reply is yes, ability estimates (WLE, MLE, EAP and plausible values) will be generated after the model has converged. This may accelerate later commands that require the use or display of these estimates. The default is no.

If you add the option abilities=yes to your estimate statement, ConQuest will produce case estimates.

Alternatively you can request specific case estimates. Say you wanted to only estimate PVs and include them in the Combined Item Difficulty Map:

Code: [Select]
show ! estimates=latent, filetype = xlsx, tables = 1:2:3:4:5:9 >> myShow.xlsx;
For a list of the tables in show files, see the command ref.

cucho_veas

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Re: problem with combined item difficulty map
« Reply #2 on: September 21, 2018, 12:14:15 PM »
Thanks! I will run the ability=yes command to produce case estimates.