If you run a backtest and open up details for a backtest period, the resulting chart has a column with the label "A/D". In the cases I've looked at all of the stocks in the backtest period get an "A". Be that as it may, what do "A" and "D" mean?
Thanks in advance.
Thanks for the kind words, just back from vacation. I am still struggling to learn like we all are. Many databases at the consumer level have "Survivorship bias". That means that a stock is deleted from the database when it goes bankrupt or is taken over. It depends on your scan and how far back you go. However, you can start getting a completely different list of stocks for a given date in a backtest than you would have actually have gotten on that date. Zacks claims to have mostly eliminated the bias. I have been told by a Zacks representative that "D" means dead, the stock isn't around anymore. "A" means alive, the stock is still around.