Hi all. I'm trying to run a three dimensional between item partial credit model for a 24 item instrument on ConQuest4. I was able to run the one dimensional model but when I try to run the three dimensional model, it runs for several hours, generates the itn and wle files and then ConQuest crashes. This three dimensional model worked fine on our old version of ConQuest (version 1). The syntax is below and the data set is attached. Any help would be much appreciated.

Thanks,

Gena

datafile pre_test_121917.dat;

format pid 1-11 responses 14-37;

codes 1,2,3,4,5;

set constraints=cases, warnings=no;

score (1,2,3,4,5) (1,2,3,4,5) () () !items(1-8);

score (1,2,3,4,5) () (1,2,3,4,5) () !items(9-16);

score (1,2,3,4,5) () () (1,2,3,4,5) !items(17-24);

Model item + item*step;

export parameters >> pre_121917_D3.prm;

export reg_coefficients >> pre_121917_D3.reg;

export covariance >> ipre_121917_D3.cov;

Estimate !method=montecarlo, nodes=2000, converge = .005;

itanal >> pre_121917_D3.itn;

show cases !estimate=wle >> pre_121917_D3.wle;

show !estimate=latent >> pre_121917_D3.shw;

equivalence wle >> pre_equivalence_121917_D3.wle;

plot icc;