I've results of two tests administered to university students:
- the 18-item true-false version of the Self-Monitoring Scale (Snyder & Gangestad, 1986);
- the Raven Progressive Matrices Test (John & Raven, 2003).
In the past I've been assessing personality profiles of students, referring to the five factor model of personality and using a test based on the International Personality Item Pool (Goldberg et al., 2006). In this case I was measuring reliability by Alpha coefficients. However, these coefficient seems not to make sense in a test like Raven's where there are only correct and wrong answers. Same doubts apply to the other test.
Should I measure the reliability of these two tests (Raven and Self-monitoring) on my sample? If so, which measure should I use?