I agree. A large portion of the money I invest is based on VV searches I have developed by using back test. it is extremely important that the back test be based on data that accurately reflects what would have happened during the time of the back test.
Apparently VV deletes stocks from the data base that were delisted which skews the results of the back test. This can result in back test that are significantly different from what would have happened if you had actually traded the stocks during the time of the back test. This greatly reduces my confidence in the data that VV provides. Data used for back test should include all stocks that were available to buy until they were delisted. Fixing this problem should receive a high priority in my opinion.
Phillip Root
supported this idea
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I agree. A large portion of the money I invest is based on VV searches I have developed by using back test. it is extremely important that the back test be based on data that accurately reflects what would have happened during the time of the back test.
Apparently VV deletes stocks from the data base that were delisted which skews the results of the back test. This can result in back test that are significantly different from what would have happened if you had actually traded the stocks during the time of the back test. This greatly reduces my confidence in the data that VV provides. Data used for back test should include all stocks that were available to buy until they were delisted. Fixing this problem should receive a high priority in my opinion.