Methods and formulas for the fits and residuals in Analyze Variability

Fit

Notation

TermDescription
Ln(Fit)
xk k th term, each term can be a single predictor or an interaction term
bk estimate of k th regression coefficient

Ratio residuals

The ratio of the observed response standard deviation to the fitted standard deviation:

Notation

TermDescription
sstandard deviation
fitted standard deviation

Log residuals

The difference between the natural log of the observed response standard deviation and the natural log of the fitted standard deviation. It is the log of the ratio residual:

Notation

TermDescription
sstandard deviation
fitted standard deviation

Standardized log residuals

The log residual divided by its asymptotic standard error.

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