Zelig {Zelig}R Documentation

Zelig: Everyone's Statistical Software

Description

Zelig provides a unified notation and framework for statistical analysis by encompassing many other statistical methods. It also makes it easy to interpret and present statistical results by simulating quantities of interest from their corresponding posterior distributions. Full documentation is available online at http://gking.harvard.edu/zelig, and help for specific commands is available through link{help.zelig}.

Usage

z.out <- zelig(formula, model, data, ...)
x.out <- setx(z.out, ...)
s.out <- sim(z.out, x = x.out, num = 1000, ...)

Arguments

formula formula used for a statistical model, using, for example, the symbolic representation Y ~ X1 + X2. Note that + denotes inclusion, not addition, in the case of the non-linear models.
model name of a statistical model. Refer to help.zelig("models") for a full list of models.
data data frame containing variables called in formula.
z.out output from zelig.
x.out output from setx.
num number of simulations, i.e., posterior draws.
x values of explanatory variables used for simulation.
... additional arguments affecting estimation, values of explanatory variables, and simulation.

Details

The following steps are required. First, a model is estimated via zelig. Next, with setx, the users define the values of explanatory variables according to which the quantities of interest are simulated. Third, sim draws quantities of interest from their corresponding posterior distributions or their asymptotic Normal approximation. Finally, summary provides a useful summaries for the estimated model and simulated quantities of interest.

Value

z.out output object from zelig.
x.out output object from setx.
s.out output object from sim.

Author(s)

Kosuke Imai <kimai@princeton.edu>; Gary King <king@harvard.edu>; Olivia Lau<olau@fas.harvard.edu>

References

Gary King, Michael Tomz, and Jason Wittenberg (2000), ``Making the Most of Statistical Analyses: Improving Interpretation and Presentation,'' American Journal of Political Science, vol. 44, pp. 347-355.

See Also

Please use link{help.zelig} to access the Zelig reference manual. The complete document is available online at http://gking.harvard.edu/zelig.


[Package Contents]