Power and Sample Size Determination for the Group Comparison of Patient-Reported Outcomes with Rasch Family Models
Table 3
Power estimated in the simulation study (1−) and using the Cramer-Rao’s bound (1−
) for different values of the sample size in each group (
), the group effect (
), the variance of the latent variable (
), the spacing regularity of the items and the gap between the global mean of the latent variable and the mean of the distribution of the item difficulties (
).