Residuals button: displays the scatter plot of residuals, including the result of the Durbin-Watson test. Below are typical values for the Durbin-Watson test and the corresponding residual scatter plot.
1. Positive autocorrelation of residuals (DW test almost or equal to 0.0)
Residuals of the same sign cluster together. If a residual is positive, the next one is very likely to be positive as well, creating a "wavy" or "cyclical" pattern. See the example below, resulting from fitting function number 17 to the dataset "DW test almost 0 (function n. 17).txt":
2. No Autocorrelation of residuals (DW test close or equal to 2.0)
The residuals are completely independent. Knowing the sign of a residual makes it impossible to predict the sign of the next one. See the example below, resulting from fitting function number 11 to the dataset "DW test close to 2 (function n. 11).txt":
3. Negative Autocorrelation of residuals (DW test almost or equal to 4.0)
Residuals constantly alternate signs. A positive residual is immediately followed by a negative one, and vice versa. See the example below, resulting from fitting function number 6 to the dataset "DW test almost 4 (function n. 6).txt"
