Zelig 4 is a complete rewrite of the Zelig software. Its intention is to maintain complete backwards compatability from the End-user experience, while prodividing developers a new, streamlined API to author new models in.

There are several methods for installation.

• A major operating system (Mac OS X 10.4+, Windows or Linux/Unix-alike)
• R (>= 2.14.1)

Zelig has an online install option! Using this method, users have the option to selectively install Zelig packages or install everything via one simple command. This install script can be found at: http://r.iq.harvard.edu/install_live.R

To load the installer, simply follow these directions:

1. Install the latest version of R at http://cran.r-project.org/
2. Open an R-session
3. Enter the following into an R-session: source("http://r.iq.harvard.edu/install_live.R")

In addition to the provided setup wizard, Zelig can be installed manually on a package-by-package basis. To do this, simply use the install.packages function:

install.packages(
                 "Zelig",
                 repos = "http://r.iq.harvard.edu/",
                 type  = "source"
                 )

Packages can be individually installed using a similar method to the one above:

install.packages(
                 "<PACKAGE NAME>",
                 repos = "http://r.iq.harvard.edu/",
                 type  = "source"
                 )

Where "" is the name of an available Zelig package. A complete list can be found below.

• Zelig
  • The core package of Zelig.
  • Source Code
  • Issue Queue
  • Contains: gamma, logit, ls, negbinom, normal, poisson, probit
• ZeligMultivariate
  • A package containing Zelig's Multivariate Regression offerings.
  • Source Code
  • Issue Queue
  • Contains: blogit, bprobit
• ZeligGAM
  • Generalized Additive Models for Zelig
  • Source Code
  • Issue Queue
  • Contains: logit.gam, normal.gam, poisson.gam, probit.gam
• ZeligGEE
  • Generalized Estimating Equation Models for Zelig
  • Source Code
  • Issue Queue
  • Contains: gamma.gee, logit.gee, normal.gee, poisson.gee, probit.gee
• ZeligMixed
  • Multilevel (Mixed) Model Regressions for Zelig
  • Source Code
  • Issue Queue
  • Contains: gamma.mixed, logit.mixed, ls.mixed, poisson.mixed, probit.mixed
• ZeligMultinomial
  • Multinomial Logit/Probit regressions for Zelig. This may be merged with ZeligOrdinal eventually
  • Source Code
  • Issue Queue
  • Contains: mlogit, mprobit
• ZeligOrdinal
  • Ordinal Logit/Probit regressions for Zelig
  • Source Code
  • Issue Queue
  • Contains: ologit, oprobit
• ZeligSurvey
  • Survey-weight Regressions
  • Source Code
  • Issue Queue
  • Contains: gamma.survey, logit.survey, normal.survey, poisson.survey, probit.survey
• ZeligBayesian
  • Bayesian regressions in Zelig. This uses MCMCpack to compute a wide variety of the core models!
  • Source Code
  • Issue Queue
  • Contains: logit.bayes, mlogit.bayes, normal.bayes, oprobit,bayes, poisson.bayes, probit.bayes, poisson.bayes
• ZeligLeastSquares
  • Four disparate packages based around least-squares methods
  • Source Code
  • Issue Queue
  • Contains: aov, sur, threesls, twosls
• ZeligNetwork
  • Regressions for working with matrix-style social networking data.
  • Source Code
  • Issue Queue
  • Contains: cloglog.net, gamma.net, logit.net, ls.net, normal.net, poisson.net, probit.net
• ZeligCommon
  • Common Zelig packages that have yet to be placed in a specific package.
  • Source Code
  • Issue Queue
  • Contains: exp, lognorm, quantile, relogit, rq, tobit
• ZeligMisc
  • Miscellaneous Zelig packages. These should be sorted out.
  • Source Code
  • Issue Queue
  • Contains: arima, coxph, ei.RxC