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.