This is a tool for backtesting stock screens, as defined and used by the Mechanical Investing (MI) message board at The Motley Fool. While it's quite handy (if I do say so myself), it is by no means an introduction to (or even a description of) mechanical investing.
Weird Old Stuff:
|These old backtester concepts seemed like a good idea at the time, but aren't of much use these days.
|Relative Strength of Screens
GTR1 can do the same screens available here, and much more besides. Trading can be weekly or even even daily, with a huge array of data to screen from. You have a lot of control, but there's something of a learning curve.
Keelix's SIPRO backtester uses the SIPRO database available from The American Association of Individual Investors. You can test from a database of all stocks traded on American exchanges, with weekly data going back to 1997. The site also includes a message board, and rankings of many SIPRO screens.
Hugh Todd's WER Trade Simulator uses the Weekend Review data from Investors' Business Daily. It has a relatively small set of stocks, pre-screened to IDB's own criteria. Weekly data is available back to 1992. There is also an associated message board for this tester.
Related Tools and Resources
RadiScreen (also here) is an essential tool for getting current picks from your own screens. Armed with a subscription to SI Pro and a backtester code, this excel spreadsheet will do all necessary calculations for you.
For SOS (Screen of Screens) picks, Brian Matthews' Saucer is the easy way to find the current list. Choose any of the standard MI screens, and the Saucer will combine them.
Mechanical Investing Board Resources by Mark Willcox has tools for the MI board, including a handy search function much better than TMF's own, and automated links to various screen rankings posts.