MPROX= maximum number of PROX iterations = 10

Specifies the maximum number of PROX iterations to be performed. The PROX, "normal approximation", algorithm provides starting values for the JMLE algorithm, in order to speed up estimation. PROX has little influence on the final JMLE estimates.

 

MPROX= 1 or more

PROX iterations are performed so long as inestimable parameters have been detected in the previous iteration, because inestimable parameters are always dropped before the next iteration. At least 2 PROX iterations will be performed. PROX iteration ceases when the specified number of iterations have been done or the spread of the persons and items no longer increases noticeably (0.5 logits). The spread is the logit distance between the top 5 and the bottom 5 persons or items. Then JMLE iterations begin.

MPROX= 0

Continue PROX iterations indefinitely until you intervene with Ctrl+f

MPROX= -1 (or there are anchored items or persons)

No PROX estimation is done

 

Example 1: To set the maximum number of PROX iterations to 20, in order to speed up the final JMLE estimation of a symmetrically-distributed set of parameters,

 MPROX=20

 

Example 2: To minimize the influence of PROX on the final JMLE estimates,

 MPROX=-1

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