Next section: Example values

The formula for Pearson's correlation takes on many forms. A commonly used formula is shown below. The formula looks a bit complicated, but taken step by step as shown in the numerical example, it is really quite simple.

A simpler looking formula can be used if the numbers are converted into z scores:

where z

Computing Pearson's r in SPSS

Computing Pearson's r in EXCEL

Next section: Example values