Title: Ability Scores

Source: Borg and Groenen (2005)

Description: Assume that it takes two abilities, AR = ‘ability to read
well’ and AM = ‘ability for mathematics’, to perform well in the tasks
T1, ... ,T4. The data show the ability scores for five persons, their
respective performance in four tasks (Ti), and the measured
performance in these tests (Ti_star ). The scores were constructed as
follows: let Ti = a*AR + b*AM, where a + b = 1; let Ti_star = Ti +
error.