twsa {dampack} R Documentation

## Two-way sensitivity analysis using linear regression metamodeling

### Description

This function displays a two-way sensitivity analysis (TWSA) graph by estimating a linear regression metamodel of a PSA for a given decision-analytic model

### Usage

twsa(
sa_obj,
param1 = NULL,
param2 = NULL,
ranges = NULL,
nsamp = 100,
outcome = c("eff", "cost", "nhb", "nmb", "nhb_loss", "nmb_loss"),
wtp = NULL,
strategies = NULL,
poly.order = 2
)


### Arguments

 sa_obj sensitivity analysis object; either a probabilistic sensitivity analysis (make_psa_obj) or a deterministic sensitivity analysis object (run_owsa_det) param1 String with the name of the first parameter of interest param2 String with the name of the second parameter of interest ranges a named list of the form c("param" = c(0, 1), ...) that gives the ranges for the parameter of interest. If NULL, parameter values from the middle 95 from this range is determined by nsamp. nsamp number of samples from ranges outcome either effectiveness ("eff"), cost ("cost"), net health benefit ("nhb"), net monetary benefit ("nmb"), or the opportunity loss in terms of NHB or NMB ("nhb_loss" and "nmb_loss", respectively). "nmb_loss_voi" and "nhb_loss_voi" are only used in internal function calls of metamodel within other VOI functions. wtp if outcome is NHB or NMB (or the associated loss), must provide the willingness-to-pay threshold strategies vector of strategies to consider. The default (NULL) is that all strategies are considered. poly.order order of polynomial for the linear regression metamodel. Default: 2

### Value

twsa A ggplot2 object with the TWSA graph of param1 and param2 on the outcome of interest.

[Package dampack version 1.0.1 Index]