Hi,
I am running a 3 dimensional model and get very different values for the WLE Person separation reliability and EAP/PV reliability for two of the dimensions (dimension 2: WLE 0.124, EAP/PV 0.738; dimension 3: WLE 0.056, EAP/PV 0.734).
Is there something wrong with my data/syntax? Or does this mean that the abilities of individual students are not trustworthy but population parameters can be well estimated?
codes 0,1,2,3;
recode (0,1,2,3) (0,0,1,2) !items (1);
recode (0,1,2) (0,0,1) !items (5,30);
score (0,1,2) (0,0.5,1) ( ) ( ) !items (1);
score (0,1) (0,1) ( ) ( ) !items (2,6,7,8,12,16,19,20,23,25,26,31,32,35,39,42,43,44,45,48);
score (0,1) (0,1) ( ) ( ) !items (4,17,18,34,38,46,49);
score (0,1,2) (0,0.5,1) ( ) ( ) !items (11,47);
score (0,1) (0,1) ( ) ( ) !items (10,21,24,33,37);
score (0,1) ( ) (0,1) ( ) !items (3,5,9,14,27,36,40);
score (0,1) ( ) ( ) (0,1) !items (13,15,22,28,29,30,41);
model item + item*step;
set constraint=cases;
estimate ! method=montecarlo, nodes=5000, converge=.001, stderr=none;
Many thanks!
Anne