Figure 6:

Comparison of our model to traditional IFA model of severity. Top Left: The ratings of each skull were constructed using our hypothesized statistical method (using a down sampled Likert scale range 1 to 5 and using the estimated latent severity and the rater bias to bin into the categorical values). Top Right: These recreated ratings were then compared to the ratings for the skulls provided by the experts to determine the accuracy of our model. Bottom Left: The ratings of each skull were constructed using the measured interfrontal angles. Bottom Right: These recreated ratings were then compared to the ratings for the skulls provided by the experts to determine the accuracy of the interfrontal angle model. The regression coefficient (λ) relating the latent severity measure (l_i) with the interfrontal angle (A_i) was calculated to be −0.496 in the relationship l_i = λ A_i.