W3DIMSUM is designed to fit sums of 1 to 4 exponentials to a set of data, as well as suggest best fit candidate models based on a decision tree of statistical criteria. It is available online via Java Web Start which is now a part of the Java Runtime Environment. W3DIMSUM will work on a variety of Unix, Windows, and Apple systems including Windows XP, Windows 2000, Sun Solaris, Linux, and Mac OSX. For additional information, please read the following journal article:  
  Charles Harless and Joseph J. DiStefano III, Automated expert multiexponential biomodeling interactively over the Internet, Computer Methods and Programs in Biomedicine, Volume 79, Issue 2, August 2005, Pages 169-178.(Available Online at Science Direct)  
  If you are experiencing problems using the software, please review the following list of potential solutions.  
  1. In order to use W3DIMSUM, you must have the Java runtime environment installed. Many systems come with this preinstalled. If you do not have Java, or need the latest version, you can visit to download a copy. Java webstart is part of the latest Java runtime environment.

  2. W3DIMSUM can work with a proxy server. First, make sure you have the latest version (see above). Now, you must make sure Java webstart knows the correct proxy server information. Check and see what proxies are used by your browser (Internet explorer: Tools - Internet Options - Connections - LAN Settings) (Netscape Navigator: Edit - Preferences - Advanced - Proxies). Within Java Webstart control panel, open the Preferences - General and enter the same proxy server information.

  3. W3DIMSUM will have problems working through internet filtering software. Please add the "" domain to allow everything within your internet filtering software.

  4. You can also find out more information about Java Webstart at .

  5. There is also a Frequently Asked Questions located at .

  6. If you are still having problems, please contact us. If you are contacting us, please include the date and time of attempted use, reason for failure, any and all error messages, machine type and OS, and other additional information regarding internet connectivity.

  To return to the software, CLICK HERE.  


For additonal information and to report bugs please contact:

Charles Harless, Programmer

Joseph DiStefano III, Professor of Computer Science and Medicine
Director - Biocybernetics Laboratory
4531 Boelter Hall
Los Angeles, CA 90095-1596
Tel: (310) 825-7482, 206-8464 (lab) Fax: (310) 794-5057