ABSTRACT
Internal consistency refers to the extent to which the items in a test measure the same trait or ability or knowledge base. Item-total correlations is one way to assess internal consistency. High item-total correlations reveal that each item is consistent with the total score. But there is another way to measure internal consistency. Take a test or scale, split it in half, total the items in each half, and then correlate the two halves. This is called a split half reliability. Cronbach's alpha (α) is the most commonly used measure of internal consistency. In practice, coefficient alpha (α) ranges from 0 to 1.00. The six types of prosocial behaviors in the Prosocial Tendencies Measure–Revised [PTM-R] include public, anonymous, dire, emotional, compliant, and altruism. Public prosocial behaviors were defined as behaviors intended to benefit others enacted in the presence of others.
