What is the primary difference between predictive and concurrent ...

[magmichele12]

What is the primary difference between predictive and concurrent approaches to validity evidence?
 
  What will be an ideal response?

Question 2

Describe reliability as conceptualized by classical test theory.
 
  What will be an ideal response?

[kaylee05]

Answer to Question 1

While both strands of validity evidence involve correlating two scores on two related variables, predictive approaches introduce a time element. That is, the overriding concern of predictive validity evidence is the prediction of a future outcome or variable. On the other hand, concurrent evidence is concerned with immediate outcomes. Consider a new test designed to measure depression. Concurrent validity evidence would answer the question: based on scores from this test of depression, what is the likelihood a client will attempt suicide now? Predictive validity evidence may answer the question: based on scores from this test of depression, what is the likelihood a client will attempt suicide at some later time?

Answer to Question 2

Within the framework of classical test theory, reliability is conceptualized as the proportion of true score variance associated with an observed score.

[magmichele12]

TYSM

[chjcharjto14]

Gracias!