Correlation Coefficient r (Linear Correlation Coefficient)

This is a statistical measure of the strength of the relationship between the actual vs predicted outputs.  The r coefficient can range from -1 to +1.  The closer r is to 1, the stronger the positive linear relationship, and the closer r is to -1, the stronger the negative linear relationship.  When r is near 0 there is no linear relationship.  You can get the same results by using the Correlation Scatter Plot and graphing actual vs predicted outputs.  Note that r was included in NeuroShell 2 due to user request, but R Squared is a much better predictor.