This webpage contains download links for scripts that enable you to compute beta regression models of the kind described in Smithson & Verkuilen 2006. These are available in SPSS, SPlus/R, and SAS from this page. There is also a file containing R code for generating the graphs shown in our paper. We plan further updates as more resources become available.
We strongly advise downloading this Readme document before embarking on beta regression estimation in any software environment. The links in the table below enable you to download files containing instructions, commented code, and examples from our paper.
SPSS files 
SPlus/R files 
SAS files 
Instructions (MSWord)  Instructions (MSWord)  SAS instructions/examples 
Instructions (pdf)  Instructions (pdf)  
Example1.sav  Example1.txt  
Example2.sav  Example2.txt 

Example3.sav  Example3.txt  
Graphing code (MSWord)  
Graphing code (pdf) 