background: it is unclear whether knowing of current hiv status is associated with change in injecting behaviors among people who inject drugs (pwid) in iran. the objective of the present study was to determine whether awareness of hiv positive status is associated with a reduction in injecting risk behaviors, after matching for socio-demographic characteristics . methods : five hundred male pw...

This program is designed to improve causal inference via a method of matching that is widely applicable in observational data and easy to understand and use (if you understand how to draw a histogram, you will understand this method). The program implements the coarsened exact matching (CEM) algorithm, described below. CEM may be used alone or in combination with any existing matching method. T...

This paper introduces a Stata implementation of Coarsened Exact Matching (CEM), a new method for improving the estimation of causal effects by reducing imbalance in covariates between treated and control groups. CEM is faster, easier to use and understand, requires fewer assumptions, more easily automated, and possesses more attractive statistical properties for many applications than existing ...