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EVSI

Based on a Bayesian health economic model which includes the current information about the model parameters and distributions for the future data collection, functions are available to calculate the Expected Value of Sample Information (EVSI) using the Heath et al. Moment Matching method (2017, 2018). This package then contains a number of plots that present the EVSI and the Expected Net Benefit of Sampling (ENBS) to present and analysis the EVSI calculation. Finally, a shiny web application is available to dynamically explore the EVSI and present results to key stakeholders. A manual describing standard use for this package is included in this repository.

Installation

The EVSI package is currently only available in a developement version through GitHub and must be installed using the package devtools

install.packages("devtools")

The EVSI calculation method is based on Bayesian updating so an MCMC sampler is needed. Currently the EVSI package can be used with either jags or OpenBUGS. These need to be installed separately from their respective repositories and instuctions for installations under different OS can be found online. Depending on which MCMC software is used the EVSI package either requires the package rjags or the pacakge R2OpenBUGS, note that both these packages require that the respective MCMC sampler is installed separately

install.packages("rjags")
install.packages("R2OpenBUGS")

In addition to the MCMC sampler the following packages must be installed before proceeding to EVSI calculation and presentation

install.packages("BCEA","shiny","shinythemes")

After installing the required dependancies, the EVSI package can be installed using devtools with the following code

devtools::install_github("annaheath/EVSI")

Note that the EVSI package is currently under active developement and therefore it is advisable to reinstall the package directly from GitHub before each use to ensure that you are using the most up to date version.

About

Expected Value of Sample Information. A suite of functions for the calculation and presentation of the EVSI, based on a Bayesian Health economic model.

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