• The BUGS software
• What do you get?
• Obtaining files for UNIX systems
  • Directly from the Web page
  • Unpacking files
• Obtaining files for DOS systems
  • Directly from the Web page
  • Unpacking files
• Details of Versions
  • Version .51
  • Version .50

BUGS Version 0.5 is a program for carrying out Gibbs sampling in complex models. See the document Introduction to BUGS for more details. A full range of documentation is available.

We emphasise that Version 0.5 is still a test version of the software and users are encouraged to report any problems to bugs at mrc-bsu.cam.ac.uk .

BUGS is distributed as compiled code suitable for a variety of platforms. UNIX versions are run from one of two shell scripts: bugs or backbugs. The DOS version is run from one of two batch files: bugs.bat or backbugs.bat.

BUGS 0.5 is currently available for the following platforms.

Program	Platform	Version
prog05.sparc	SUN Sparc	0.51
prog05.decalpha	DEC Alpha (OSF)	0.51
prog05.decalpha	DEC Mips (Ultrix)	0.51
prog05.hp	HP	0.51
prog05.freebsd	PCs running FREEBSD	0.51
prog05.exe	PCs running DOS (32 Bit)	0.51

See `details of different versions' for improvements and known bugs.

We hope to have versions for IBM RS6000 and SGI machines available soon, as well as a LINUX version.

The programs are available in the following files, where XYX stands for the relevant platform (i.e. sparc, decalpha and so on)

File	Contents when Unpacked	Type	Description
/unix/prog05.XYZ.tar.z	bugs05.XYZ	binary	Version 0.50 for platform XYZ
	bugs	ascii	shell script
	backbugs	ascii	shell script
/dos/prog05.exe	bugs05.exe	binary	Version 0.50 for DOS
	go32.exe	binary	DOS extender
	bugs.bat	ascii	shell script
	backbugs.bat	ascii	shell script

When taking any of our programs, please make sure you leave a full e-mail address.

Bugs 0.5 has been withdrawn from our FTP service, though you can download version 0.6 in this way.

Go to the download page and click on the relevant icon. A window will then appear giving you the option to save the file to a selected directory.

You will need to uncompress and untar the files by typing

     uncompress prog05.XYZ.tar.Z       
     tar xvpf prog05.XYZ.tar

which will unpack the files into your current directory. You should then move these files to a directory which is on your path (say the /bin directory), or add the current directory to your path if it is not on there already.

[Note: If you want to try running BUGS as soon as you have unpacked it and modified your path (i.e. without having logged out first), remember to first type

     rehash

This recomputes the internal hash table of the contents of directories listed in the path variable to account for the new files you have just added.]

Bugs 0.5 has been withdrawn from our FTP service, though you can download version 0.6 in this way.

Go to the download page and click on the relevant icon. A window will then appear giving you the option to save the file to a selected directory.

Unpack the file by typing

      prog05.exe -o -d  <return>

In some window systems it may be possible unpack the file by simply trying to open it. The files bugs05.exe, go32.exe, bugs.bat and backbugs.bat will be placed in your current directory. Either add this directory to your path by editing your AUTOEXEC.BAT file, or move these files to a directory which is already on your path.

NOTE: You will need the HIMEM.SYS software driver to run BUGS - check you have this by looking for the line

      DEVICE=C:\DOS\HIMEM.SYS

in your CONFIG.SYS file. You will also need a maths co-processor.

Changes from .50

1. The tendency for .50 to crash on long runs has been corrected.

Known bugs

1. An error has been introduced into the way the stats command writes to the bugs1.ind and bugs1.out files, in that new entries overwrite previous entries.

Changes from 0.30

1. New distributions: multivariate normal, Wishart, double exponential (Laplace), logistic, t, negative binomial.
2. New functions: log-gamma, log-factorial, standard deviation, logical equals, log-determinant and matrix inverse .
3. Structured multinomial modelling to allow ordered categorical data and multinomial-logistic models.
4. Detailed breakdown of allowable parameterisations
5. Input: ability to read from multiple data and initial value files which may be simple rectangular files data:rectangular.
6. Changes to commands: output from stats now dumped to file, min and max ranges available.
7. Extra examples described above.
8. Improved error handling.
9. Additional material in the manual on model criticism, ranking, hierarchical-centering, multinomial-Poisson transformation and multivariate normal variables.
10. Restriction on size of categorical variables raised to 1000 states.
11. Convergence diagnostics provided as separate CODA suite of S-plus functions.
12. An index to the manual is provided.