Skip to main content

Table 1 Summary of the characteristics for the three model families

From: Item response models for the longitudinal analysis of health-related quality of life in cancer clinical trials

 

Models

Characteristics

Adjacent

Cumulative

Sequential

Ordinal scale

yes

yes

no

Reversibility

yes

yes

no

Interpretation using the latent variable

no

yes

yes

Always defined

yes

yes(no a)

yes

  1. afor some non proportional design models