ConstModVar: A constant model variable

In rdecision: Decision Analytic Modelling in Health Economics

A constant model variable

Description

An R6 class representing a constant in a model.

Details

A ModVar with no uncertainty in its value. Its distribution is treated as a Dirac delta function \delta(x-c) where c is the hyperparameter (value of the constant). The benefit over using a regular numeric variable in a model is that it will appear in tabulations of the model variables associated with a model and therefore be explicitly documented as a model input. Inherits from class ModVar.

Super class

rdecision::ModVar -> ConstModVar

Methods

Public methods

• ConstModVar$new()

• ConstModVar$is_probabilistic()

• ConstModVar$clone()

Inherited methods

• rdecision::ModVar$SD()
• rdecision::ModVar$description()
• rdecision::ModVar$distribution()
• rdecision::ModVar$get()
• rdecision::ModVar$is_expression()
• rdecision::ModVar$mean()
• rdecision::ModVar$mode()
• rdecision::ModVar$quantile()
• rdecision::ModVar$r()
• rdecision::ModVar$set()
• rdecision::ModVar$units()

---

Method new()

Create a new constant model variable.

Usage

ConstModVar$new(description, units, const)

Arguments

description

A character string description of the variable and its role in the model. This description will be used in a tabulation of the variables linked to a model.

units

A character string description of the units, e.g. "GBP", "per year".

const

The constant numerical value of the object.

Returns

A new ConstModVar object.

---

Method is_probabilistic()

Tests whether the model variable is probabilistic.

Usage

ConstModVar$is_probabilistic()

Details

Does the random variable follow a distribution, or is it an expression involving' random variables, some of which follow distributions?

Returns

TRUE if probabilistic

---

Method clone()

The objects of this class are cloneable with this method.

Usage

ConstModVar$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Author(s)

Andrew Sims [e-mail]

rdecision documentation built on April 3, 2025, 6:09 p.m.