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GPS-X Technical Reference

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Table 14-1 - Summary of How to Use the Statistical Tests<br />

Optimizer 408<br />

Statistic<br />

Confidence Limits<br />

Correlation Matrix<br />

Significance of Regression Test<br />

Lack of Fit Test<br />

Standardized Residuals<br />

Standardized Residual Plots<br />

Portmanteau Probability<br />

Values<br />

How to Interpret<br />

If the confidence limits on a parameter include zero it<br />

indicates that this parameter is not significant to the<br />

model.<br />

Large off-diagonal elements (close to one) suggest<br />

that certain parameters are correlated.<br />

Probability values larger than the significance level<br />

indicate that the variation explained by the regression<br />

is less than expected by chance.<br />

Probability values smaller than the significance level<br />

provide evidence for a lack of fit in the fitted model.<br />

The majority of standardized residuals should be<br />

between +2 and -2.<br />

The residuals should be randomly scattered about<br />

zero without any noticeable trends.<br />

Probability values smaller than significance level<br />

suggest that the residuals are correlated.<br />

<strong>GPS</strong>-X <strong>Technical</strong> <strong>Reference</strong>

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