Author Topic: Item thresholds cannot be produced  (Read 731 times)

Melody

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Item thresholds cannot be produced
« on: July 26, 2018, 02:28:50 AM »

Hi!

I am using between-item multidimensional model for data of Likert-type survey with ConQuest. And when I hope to get item thresholds results, I continuously get the warning that  "Item thresholds are not available for partial order models, within item multidimensional models, models with non-integer scores, or models with null categories."... And the item thresholds result cannot be generated.

I checked the data and found no non-integer scores,and every category in every item has responses...Are there any other reasons for this? How can I solve that?

Many thanks.



dan_c

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Re: Item thresholds cannot be produced
« Reply #1 on: July 26, 2018, 02:38:25 AM »
Can you post your datafile, syntax file, and output, or create a reproducible example using the online examples?

See: https://conquest-forums.acer.edu.au/index.php?topic=1239.0


Melody

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Re: Item thresholds cannot be produced
« Reply #2 on: August 23, 2018, 08:57:45 AM »
Thank you very much for your reply.

The problem was solved by

change sytanx from

score (1,2,3,4) (1,2,3,4) () () ()! items (1,2,3,4,5,6,7,8);
score (1,2,3,4) () (1,2,3,4) () ()! items (9,10,11,12,13);
score (1,2,3,4) () () (1,2,3,4) ()! items (14,15,16,17,18);
score (1,2,3,4) () () () (1,2,3,4)! items (19,20,21,22,23,24,25);
model item+step;

To
recode (1) (0)! items (1-25);
recode (2) (1)! items (1-25);
recode (3) (2)! items (1-25);
recode (4) (3)! items (1-25);

score (0,1,2,3) (0,1,2,3) () () ()! items (1,2,3,4,5,6,7,8);
score (0,1,2,3) () (0,1,2,3) () ()! items (9,10,11,12,13);
score (0,1,2,3) () () (0,1,2,3) ()! items (14,15,16,17,18);
score (0,1,2,3) () () () (0,1,2,3)! items (19,20,21,22,23,24,25);
model item+step;


As by default the category should start from 0...
Thanks.

Xiaoxun

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Re: Item thresholds cannot be produced
« Reply #3 on: August 25, 2018, 04:31:33 AM »
Hi Melody,

Glad to see that you have the problem solved. You can also try the following when specifying the multi-dimension.

score (1,2,3,4) (0,1,2,3) () () ()! items (1,2,3,4,5,6,7,8);
score (1,2,3,4) () (0,1,2,3) () ()! items (9,10,11,12,13);
score (1,2,3,4) () () (0,1,2,3) ()! items (14,15,16,17,18);
score (1,2,3,4) () () () (0,1,2,3)! items (19,20,21,22,23,24,25);
model item+step;

Xiaoxun