I’ll add a few comments on GTR1, P123 and other backtesters capabilities and quality.

First Robbie’s GTR1 available for free until a few months ago and hopefully again soon is an
almost unbelievable capable backtester. Robbie’s logic, math and programing skills are undeniably
outstanding. But with only one primary part time individual keeping the program up and running
it is going to be difficult to compete with for pay competitors. I’m a long time fan of GTR1 and
even though I first subscribed to P123 in 2005 and received a complimentary free membership
in Equitieslab when I suggested some improvements to their example screens. I have still preferred
GTR1 as my primary tool for individual stock selection.

However for ease of use and capability both P123 and equitieslab are in my opinion excellent products.
P123 last time I looked has ~ 7 full time employees and a very robust user community including
many professional level investors. At the advanced level they are developing the capability to
download data for developing machine learning non linear screens.

Equities Lab claims to have 6 full time employees. Although I haven’t tried useing equitieslab for
many years it always tried to be more a user friendly with easy to construct screens. I don’t know
what factors they include in their current package but they were more limited than P123 in past
years. A little easier starting off than P123.

I’ve been primarily using Allocat Smartly for ETFs and with the absence of GTR1 moving back to a
combination of my own home brew SIP screener/backtester and P123.

RAM

Mechanical Investing FAQ

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