Analyze Mixture Design

Mixture Regression
Unusual Observations

  

The unusual observation table displays cases with standardized residuals with absolute values greater than 2. These cases do not follow the proposed regression equation well.

For unusual observations, you should investigate whether the data were recorded correctly, and whether the data collection process was affected by any other factors.

Note

Residual plots can also help you examine the assumptions about the regression model.

Example Output

Unusual Observations for Flavor    

 

Obs  StdOrder  Flavor     Fit  SE Fit  Residual  St Resid

 10        10  58.000  58.799   1.436    -0.799     -2.10R

 12        12  94.000  93.210   1.436     0.790      2.07R

 

R denotes an observation with a large standardized residual

Interpretation

For the fondue data, two observations are unusual:

·    observation 10, has a standardized residual of - 2.10

·    observation 12, has a standardized residual of 2.07