R:

• A brief introduction to Getting started in R is: Rintro.html
• A sample R program (discussed in Rintro.html) is Rexample.R
  
• A second R program for linear regression and saving output is Rfurtherexample.R
• Several R programs for basic linear regression for the book Economics Data: An Introduction to Econometrics see AED R programs
  
• For count data regression using R see especially program racd03.R at the website for Regression Analysis of Count Data, second edition.
• For nonparametric and semiparametric regression using R package np see program racd11.R at the website for Regression Analysis of Count Data, second edition.
  
  

A. Colin Cameron / UC-Davis Economics / http://www.cameron.econ.ucdavis.edu/