Developing a measure of wealth for primary student families in a developing country: Comparison of two methods of psychometric calibration |
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| Institution: | Assessment Research Centre, the University of Melbourne, Australia |
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| Abstract: | This article compares the invariance properties of two methods of psychometric instrument calibration for the development of a measure of wealth among families of Grade 5 pupils in five provinces in Vietnam. The measure is based on self-reported lists of possessions in the home. Its stability has been measured over two time periods. The concept of fundamental measurement, and the properties of construct and measurement invariance have been outlined. Item response modelling (IRM) and confirmatory factor modelling (CFM) as comparative methodologies, and the processes used for evaluating these, have been discussed. Each procedure was used to calibrate a 23-item instrument with data collected from a probability sample of Grade 5 pupils in a total of 60 schools. The two procedures were compared on the basis of their capacity to provide evidence of construct and measurement invariance, stability of parameter estimates, bias for or against sub samples, and the simplicity of the procedures and their interpretive powers. Both provided convincing evidence of construct invariance, but only the Rasch procedure was able to provide firm evidence of measurement invariance, parameter stability and a lack of bias across samples. |
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