Figure 4
The figure shows two graphs in a vertical arrangement. The top panel is a histogram. The horizontal axis ranges from 0 to 50 in increments of 10, and the vertical axis ranges from 0 to 60 in increments of 20. The tallest bar is at 32, with a height of 58, and another prominent bar appears at 21, with a height of 49. Most tall bars are between 12 and 35 on the horizontal axis. Bars farther left and right are shorter, generally under 10. A dashed curve is superimposed on the histogram. It rises gradually, forming two peaks: one centered near 21 and a higher peak near 32, before declining to the right. The bottom panel is a scatter plot with dots distributed along the graph area. The horizontal axis ranges from 0 to 50 in increments of 10, and the vertical axis ranges from negative 10 to 20 in increments of 10. A dashed horizontal line crosses the vertical axis at 0. The dots cluster around the 0 line, with positive outliers at (21, 19.6) and negative outliers at (19, negative 10). Some points near 0 are (9.92, negative 2.67), (37.10, 1.43), and (28.87, 5.75). Note: All numerical values are approximated.Fit of the proposed model with the adoption curve and the corresponding residual plot for the Portuguese case. Source: Figure by authors