apollo (version 0.0.7)

apollo_deltaMethod: Delta method

Description

Applies the delta method to calculate the standard errors of transformations of parameters.

Usage

apollo_deltaMethod(model, deltaMethod_settings)

Arguments

model

Model object. Estimated model object as returned by function apollo_estimate.

deltaMethod_settings

List of arguments. It must contain the following.

• operation: Character. Function to calculate the delta method for. See details.

• parName1: Character. Name of the first parameter.

• parName2: Character. Name of the second parameter. Optional depending on operation.

• multPar1: Numeric scalar. A value to scale parName1.

• multPar2: Numeric scalar. A value to scale parName2.

Value

Value, s.e. and t-ratio resulting from the operation.

Details

apollo_deltaMethod supports the following five operations.

sum

Calculates the s.e. of parName1 + parName2

diff

Calculates the s.e. of parName1 - parName2 and parName2 - parName1

ratio

Calculates the s.e. of parName1/parName2 and parName2/parName1

exp

Calculates the s.e. of exp(parName1)

logistic

If only parName1 is provided, it calculates the s.e. of exp(parName1)/(1+exp(parName1)) and 1/(1+exp(parName1)). If parName1 and parName2 are provided, it calculates exp(par_i)/(1+exp(parName1)+exp(parName2)) for i=1, 2, and 3 (par_3 = 1).

lognormal

Calculates the mean and s.d. of a lognormal distribution based on the mean (parName1) and s.d. (parName2) of the underlying normal.