Class PriorInLog

Overrides: Residual.__init__

The value of the residual give a current set of parameters and
resulting predictions.

Overrides: Residual.GetValue

(inherited documentation)

Partial derivative of the residual with respect to any parameters.

Should return a dictionary of the form:
    {parameter name: derivative}

Overrides: Residual.dp

(inherited documentation)

Partial derivative of the residual with respect to any calculated 
variables.

Should return a dictionary of the form:
    {calculation name: {variable name: {x value: deriv}}}

Overrides: Residual.dy

(inherited documentation)

Partial derivative of the residual with respect to any internal
variables.

Should return a dictionary of the form:
    {type of internal var: {expt name: {variable name: derivative}}}

XXX: This form of nesting is only appropriate for scale factors.

Overrides: Residual.dintVars

(inherited documentation)