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Topics - Anne Ham

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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


Pages: [1]