esting the assumptions and interpreting the results of the Rasch model using log-linear procedures in SPSS

This paper shows how to use the log-linear subroutine of SPSS to fit the Rasch model. It also shows how to fit less restrictive models obtained by relaxing specific assumptions of the Rasch model. Conditional maximum likelihood estimation was achieved by including dummy variables for the total scores as covariates in the models. This approach greatly simplifies the specification of the Rasch models. We illustrate these procedures in an analysis of four items selected from the Reiss Premarital Sexual Permissiveness Scale. We found that a modified version of the Rasch model with item dependencies fits the data significantly better than the simple Rasch model. We also found that the item difficulties are the same for men and women, but that the item dependencies are significantly greater for men. Apart from any substantive issues these results raise, the value of this exercise lies in its demonstration of how researchers can use the procedures of popular, accessible software packages to study an increasingly important set of measurement models

Showicd:A Computer Program to Display Icd-9Cm Coded Injury Diagnoses and Their Corresponding Injury Severity Scores for a Particular Patient

SHOWICD is an interactive computer program designed to document severity of injury from the ICD-9CM coded injury diagnoses of a particular patient. Two severity-of-injury scores [the Abbreviated Injury Scale (AIS) and the Injury Severity Score (ISS)] are used. By employing the AIS scores, the severity of injury may be assessed per body region. The ISS provides an over-all index or summary score for severity of injury of the whole body. SHOWICD allows the user to analyze the effects of different types of injuries on the Injury Severity Score. SHOWICD may be employed either alone as a program or as a procedure in database management systems. The program is written in Turbo Pascal