[R] RE: two new packages

Bliese, Paul D MAJ WRAIR-Wash DC Paul.Bliese at NA.AMEDD.ARMY.MIL
Tue May 1 15:49:04 CEST 2001


Thanks for making these available!  I'm very interested in your sem package
in particular.  Do you have versions that run in S-PLUS too?  I'll send
comments as I work through the materials.


MAJ Paul D. Bliese, Ph.D.
Chief, Dept. Operational Stress Research
Walter Reed Army Institute of Research
Washington, DC 20307
Voice:  (301) 319-9873
Fax:     (301) 319-9484
paul.bliese at na.amedd.army.mil

-----Original Message-----
From: John Fox [mailto:jfox at mcmaster.ca]
Sent: Friday, April 27, 2001 10:52 PM
To: R-announce at r-project.org
Subject: two new packages

I've prepared preliminary versions of two packages that I plan eventually 
to contribute to CRAN:

car (for "Companion to Applied Regression") is a package that provides a 
variety of functions in support of linear and generalized linear models, 
including regression diagnostics (e.g., studentized residuals, hat-values, 
Cook's distances, dfbeta, dfbetas, added-variable plots, component+residual 
plots, ceres plots, Durbin-Watson statistics); some tools for graphing and 
exploring data (e.g., enhanced quantile-comparison plots -- with simulated 
envelopes for studentized residuals from linear models, scatterplot, and 
scatterplot-matrix functions); some utilities (e.g., for recoding 
variables); some functions for transformations of data (e.g., multivariate 
unconditional Box-Cox transformation); an enhanced Anova function; and many 
datasets. The object is to make tasks that are commonly employed in 
regression modeling more convenient, particularly for students with limited 
programming skills. I've tried largely to avoid duplicating capabilities in 
existing packages.

sem is a package for fitting "structural-equation models." The package 
supports general structural equation models with latent varibles, fit by 
maximum likelihood assuming multinormality, and single-equation estimation 
for observed-variable models by two-stage least squares.

For the present, I'm making these packages available on my web site, at 
<http://www.socsci.mcmaster.ca/jfox/Misc/car/> and 

I'm particularly interested in suggestions and comments.


  John Fox
  Department of Sociology
  McMaster University
  email: jfox at McMaster.ca
  web: www.socsci.mcmaster.ca/jfox

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