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Figure 1 | Health and Quality of Life Outcomes

Figure 1

From: Measurement of change in health status with Rasch models

Figure 1

Rasch analyses run separately on the data from the two time points. The upper diagram depicts the item measures at Time 2 (y axis) plotted against those at Time 1 (x axis). Greater measures indicate more severe items. The identity line x = y is added for reference. The lower diagram depicts the thresholds and the probability curves of response categories at Time 1 (unbroken line) and Time 2 (broken line). “↑” points out the location of the thresholds on the latent variable.

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