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What does the point biserial measure ?

     The relationship between two variables, a categorical variable (i.e., the student either answered the test item correctly or incorrectly), with a continuous variable(i.e., percent score on the examination).

How do you interpret a point biserial correlation?

   As with all correlation indices, the point biserial ranges from –1.00 to +1.00.

   A positive point biserial tells us that those scoring higher on

  the exam were more likely to have better item “discriminates” between high-scoring and low-scoring students).

www.som.tulane.edu.

Item Discrimination Index

Point BIserial Correlation( rpbs )

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