Fig. 4
From: Four scales measuring mental wellbeing in the Nordic countries: do they tell the same story?
Test information function for all items combined and partial test information functions for the items of the SWEMWBS, HBSC Health Complaints Scale, Cantril’s ladder, and WHO Wellbeing Index. This analysis is based on the bifactor model shown in Fig. 3. The general latent factor is standardized with mean = 0 and SD = 1