A Monte Carlo simulation study of sample size requirements for the Graded Response Model
Fig 2
Changes in RMSEa with sample size (n).
The boxplots show the distribution of estimation errors under each condition. The parameter a represents the slope parameter in the Graded Response Model (GRM), and RMSEa indicates the estimation accuracy for a. The x-axis represents the sample size (n), and the y-axis represents the RMSE of the estimated slope parameters. The number of response categories (K) is indicated by panel or grouping as appropriate.