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:: Wessa.net - Web-enabled scientific services & applications ::
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The non-commercial (academic) use of this software is free of charge. The only thing that is asked in return is to cite this work when results are used in publications.
Wessa.net (est. 2003) is an inter-related collection of free online software applications for the purpose of: mathematical equation plotting (incl. function analysis, numerical integration & derivation), multiple regression (incl. many diagnostics), a wide selection of descriptive statistics (see Xycoon.com), hypothesis testing, sample size, financial computations, Box-Jenkins time series analysis, many robustness diagnostics for time series, bootstrap simulation of profit densities for various types of parameterized trading strategies, database of historical financial time series (updated daily), etc... The name Wessa is an abbreviation of 'Web-Enabled Scientific Services and Applications', and at the same time it is my surname. The modules that are currently available online, represent a (very small) subset of statistical software applications that I have been developing for the purpose of research and education. The earliest developments date back to the year 1988 when I developed a Full Information Maximum Likelihood Estimation algorithm for time sereis models. Since that time the software has evolved technologically and grown in size. Until 2003 the software was available for various platforms (Linux, Windows, and OS/2) and technologies (stand-alone exe, RPC libraries, ActiveX/DCOM, .Net). In 2003 I decided - due to a variety of reasons - to discontinue further development of the software for different platforms/technologies, and to switch to the open-access publishing model with the use of internet technology. The underlying philosophy of this decision is that everyone (with internet access) should be able to use the software applications free of charge, and without the need to download & install anything on the client machine. The use of this technology brings about some very important advantages in comparison with 'ordinary' Download-Install-and-Execute (DIE) software : - there are no downloads (no applets, no scripts, no executables). Therefore there are no installation problems and the management/support of different versions is greatly simplified. Upgrades, bug fixes, and restoration of backups are quickly and cheaply performed. Another nice advantage is the fact that the use of this system is 100% secure (there is no danger of infecting the home computer with viruses)
- there are no compatibility problems. The user interface is created with standard html and all communication between users and servers is handled through http or https. In other words, every user with an internet connection and a ‘normal’ browser is able to use all the features that are made available through this system
- the server software can be ported to (almost) any platform: the server code is written in ANSI C. This allows to make use of relatively cheap, dedicated hosting solutions. In other words, the exploitation costs can be greatly reduced
- issues related to scalability and performance can be solved by the redirection algorithm that routes requests to servers with excess capacity
This is an exciting time with many new challenges and opportunities for the field of statistical computing. This project is a modest attempt to make statistical computing easily accessible to anyone with internet access. Plans for the near future are quite ambitious but at the same time very tangible. Watch out for new developments in 2006... PW, December 2005
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To cite Wessa.net in publications use:
Wessa, P. (2008), Free Statistics Software, Office for Research Development and Education,
version 1.1.18, URL http://www.wessa.net/
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R&D, and the 'Office for Research, Development, and Education' - All rights reserved. This website is an intellectual
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graphical illustrations (gif files), computer software, online or electronic
documentation, associated media, and printed materials. The free use of the scientific content, services, and applications in this website is
granted for non commercial use only. In any case,
the source (url) should always be clearly displayed. Under no circumstances are
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as to the accuracy or completeness of such information (or software), and it assumes no
liability or responsibility for errors or omissions in the content of this web
site, or any software bugs in online applications. Your use of this web site is AT YOUR OWN RISK. Under no circumstances and
under no legal theory shall Resa R&D be liable to you or any other
person for any direct, indirect, special, incidental, exemplary, or
consequential damages arising from your access to, or use of, this web site.
Software Version : 1.1.18
Algorithms & Software : Prof. dr. P. Wessa
Facilities : Resa R&D - Office for Research, Development, and Education
Server : www.wessa.net
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