# Amelia v1.7.4

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## A Program for Missing Data

A tool that "multiply imputes" missing data in a single cross-section (such as a survey), from a time series (like variables collected for each year in a country), or from a time-series-cross-sectional data set (such as collected by years for each of several countries). Amelia II implements our bootstrapping-based algorithm that gives essentially the same answers as the standard IP or EMis approaches, is usually considerably faster than existing approaches and can handle many more variables. Unlike Amelia I and other statistically rigorous imputation software, it virtually never crashes (but please let us know if you find to the contrary!). The program also generalizes existing approaches by allowing for trends in time series across observations within a cross-sectional unit, as well as priors that allow experts to incorporate beliefs they have about the values of missing cells in their data. Amelia II also includes useful diagnostics of the fit of multiple imputation models. The program works from the R command line or via a graphical user interface that does not require users to know R.

# Amelia II

Amelia II is an R package for the multiple imputation of multivariate incomplete data. It uses an algorithm that combines bootstrapping and the EM algorithm to take draws from the posterior of the missing data. The Amelia package includes normalizing transformations, cell-level priors, and methods for handling time-series cross-sectional data.

## How to install

### Installation requirements

Amelia requires R version 2.14.0 or higher.

### Manual installation

install.packages("Amelia")


### Installing unstable developer version:

require(devtools)
install_github("IQSS/Amelia", ref = "develop")


## Functions in Amelia

 Name Description africa Economic and Political Indictors in 6 African States compare.density Compare observed versus imputed densities write.amelia Write Amelia imputations to file amelia-package Amelia II: A Program for Missing Data summary.amelia Summary of an Amelia object transform.amelia Transform imputed datasets from Amelia objects ameliabind Combine multiple runs of Amelia combine.output Combine Multiple Amelia Output Lists overimpute Overimputation diagnostic plot plot.amelia Summary plots for Amelia objects disperse Overdispersed starting values diagnostic for multiple imputation missmap Missingness Map amelia AMELIA: Multiple Imputation of Incomplete Multivariate Data freetrade Trade Policy and Democracy in 9 Asian States tscsPlot Plot observed and imputed time-series for a single cross-section moPrep Prepare Multiple Overimputation Settings AmeliaView Interactive GUI for Amelia mi.meld Combine Multiple Results From Multiply Imputed Datasets No Results!

## Vignettes of Amelia

 Name auto/amelia.el Makefile amelia.Rnw amelia.bib context-menu.png diag.png distpri.png import.png index.shtml main.png numopts.png options.png output-log.png rangepri.png splash.png utf8.def No Results!