Skip to content
Power calculator for instrumental variable analysis in pharmacoepidemiology Stata package
Branch: master
Clone or download
Fetching latest commit…
Cannot retrieve the latest commit at this time.
Permalink
Type Name Latest commit message Commit time
Failed to load latest commit information.
PharmIV.ado
PharmIV.pkg
PharmIV.sthlp
README.md
stata.toc

README.md

PharmIV-Stata

This respository supplies the Stata package to calculate the power of an instrumental variable analysis study using a single binary instrument Z to analyse the causal effect of a binary exposure X on a continuous outcome Y in the context of pharmacoepidemiology. If you use this material, please cite:

Walker VM, Davies NM, Windmeijer F, Burgess S, Martin RM. Power calculator for instrumental variable analysis in pharmacoepidemiology. Int J Epidemiol. 2017 Oct 1;46(5):1627–32.

To find futher information relating to this paper, including the Stata code from the paper and the R package, please see https://github.com/venexia/PharmIV

Installation

The package can be installed using the following commands:

net install github, from("https://haghish.github.io/github/")
github install venexia/PharmIV-Stata

Syntax

The syntax for this package is as follows:

PharmIV, n(numlist) delta(numlist) alpha(numlist) sigma(numlist) prob_x1(numlist) prob_z1(numlist) cond_z1(numlist) cond_z0(numlist) 

Example

What is the power of an instrumental variable analysis study with 10,000 participants to detect a treament effect of 0.20 for a treatment with a frequency of exposure of 0.50? The binary instrument for the study has a freqency of 0.20 and the probability of exposure given the instrument Z=0 is 0.57.

alt text

You can’t perform that action at this time.