## Imai, Kosuke, Ying Lu, and Aaron Strauss (Forthcoming).eco: R Package for Ecological Inference in 2 x 2 Tables'' Journal of Statistical Software.

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### Abstract

 eco is a publicly available R package that implements the Bayesian and likelihood methods proposed in Imai, Lu, and Strauss (2008) for ecological inference in $2 \times 2$ tables as well as the method of bounds introduced by Duncan and Davis (1953). The package fits both parametric and nonparametric models using either the Expectation-Maximization algorithms (for likelihood models) or the Markov chain Monte Carlo algorithms (for Bayesian models). For all models, the individual-level data can be directly incorporated into the estimation whenever such data are available. Along with in-sample and out-of-sample predictions, the package also provides a functionality which allows one to quantify the effect of data aggregation on parameter estimation and hypothesis testing under the parametric likelihood models.

### Current Version

 The current version is 3.1-4 (built on 07/12/09) which runs on R 2.0.0 and higher. The source code is available for download from The Comprehensive R Archive Network (CRAN)

### Installation

 Regardless of one's operating system, the software can be installed by typing the following command at R prompt: > install.packages("eco") This will install the latest version from CRAN.

### Documentation

 The complete documentation is available in pdf format. The software also comes with standard R help files.