I've been a RW subscriber for about 2 months from January to March 2019.  I've noticed that while backtesting from 20-30 years to today seems to show a benefit to the program long term, the short term results of most of the strategies haven't outpaced the SP500 results lately, and in many cases fell well below the return.  When testing from Nov 1, 2018 to present, it's hard to find ANY that have shown to be superior to the SP500!  Which screeners have people found that will protect us from the inevitable market correction which will occur?  


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Marc064 at 07/06/19 12:31 AM : RE: Backtesting Danger " Reduce the number of stocks in the screen. For example, in the SOW folder, the Zacks Filtered Rank 5 is a top strategy. However it is set up to pick 5 stocks. Modify the strategy to only pick two stocks and the back test shows it easily out perfomrs the S&P 500.  ..."

Tiger at 07/03/19 2:24 PM : RE: Backtesting Danger " My experience is same. It is a matter of long term investment and consisitency. If you fall in wrong cycle of invetment you will loose your shirt. Be careful. ..."

thymara at 04/06/19 11:13 AM : RE: Backtesting Danger " I do not trust the backtester. I have a simple screen, using an S&P 100 portfolio, and asking for the bottom (need bottom because Zacks 1 is better than Zacks 20)  Zack ranked stock. Regardless, when I backtest and view the results the Backtest Period Details are different from the Historial Report. Now it could be that I don't ..."

Norman at 06/30/19 7:54 PM : RE: Backtesting Danger " I am not a Zacks person.  I don't think there are any still on the site.  One piece of advice is to spend time reading the posts from the past.  You can learn a lot.  The database is supposed to be adjusted for survivorship bias.  When you do a backtest, bring up the list of stocks for a period.  There is a column that contains t..."

Chuck_L at 06/29/19 8:33 AM : RE: Backtesting Danger " I'm not 100% certain but I believe the historical reports basically show the "surviving" companies over the time period selected, generated by the screen. However, backtesting takes into account portfolio turnover, since once stock no longer fits the criteria selected, it is "sold." Perhaps a Zacks person can jump in here if I am incor..."


Reduce the number of stocks in the screen. For example, in the SOW folder, the Zacks Filtered Rank 5 is a top strategy. However it is set up to pick 5 stocks. Modify the strategy to only pick two stocks and the back test shows it easily out perfomrs the S&P 500. 


Attach file (image (.gif, or .jpg), screen (.und) or report (.rpd))

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