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The week's question
In March 2025, in the thread "Re: OT, out", Umm asked the members: "Do you think it is because America is made up of magical soil that makes businesses based in America magically profitable?" This week it is put to everyone again. The button below opens the small thread re-asking it - read what others have said so far, then give your own answer as an ordinary reply.
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Investment Strategies / Mechanical Investing
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Author: rayvt ✧☼🐝🐝  😊 😞
Number: of 6243 
Subject: Re: new strategy source
Date: 10/03/26 10:06 PM
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No. of Recommendations: 3
Your explanation of the monthly execution timing is also useful. I use a different convention: signal on the third-to-last trading-day close and execute at the second-to-last trading-day close. I would be very interested in seeing whether your results materially change when you test that timing.

Garbage.

Focus on real things. Focus on things that there is a rational reason for, not things that accidently seem to work. Focus on BIG things, not tiny things.

We must realize that the actual trade prices we get will not be the quoted open or close prices. If you think that we'd get the backtested returns to even one decimal place you are just fooling yourself.
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This community has written 6,227 posts about Mechanical Investing. The article-length ones it recommended most:
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OT - Div yields and returns · 32 recs · 2024
Using AI to generate backtesting programs · 30 recs · 2025
Rankings for 19Dec2022 · 29 recs · 2022
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