Figure 8:

Posterior medians for 200 simulations for each age group, where true age preference is U-shaped and sample size n = 500. Black circles are true preference probabilities for each age group. The numerical index for the 9 plots correspond to the expected proportion of the sample that are older adults (also known as the probability of sampling the subpopulation group with age categories 9-12). The shaded gray region corresponds to the age categories of older individuals for which we over/under sample. The center of the grid represents completely random sampling and representative sampling for age categories. Local regression is used for the smoothed estimates amongst the three prior specifications.