https://thealgobench.com/tags/equity-backtests/Recent content in equity backtests on The Algo BenchHugoen-INWed, 07 Oct 2026 00:00:00 +0000https://thealgobench.com/landmines/survivorship-bias/Wed, 07 Oct 2026 00:00:00 +0000https://thealgobench.com/landmines/survivorship-bias/<h2 id="the-trap">The trap</h2> <p>You want to test a stock strategy on the NIFTY 500, so you download the list of NIFTY 500 stocks and run your rules over the last ten years. The problem is that the list you downloaded is <strong>today&rsquo;s</strong> list. It contains only the companies that are still big and still listed. Every company that collapsed, was delisted, merged away or simply shrank out of the index along the way has disappeared from your test.</p>