Because the VV data base loses stock symbols due to delisting and buy outs (the survivorship bias), results of backtests sometime cannot be repeated a second time. The user can manually find out
if there are changes in the stocks selected in the second run by examining the Trade History under the Reports tab of the Backtester. This tedious and time consuming when the backtest covers several years. By adding a list of stock symbols used each quarter or less under the Reports tab, the user can quickly compare and follow up on the missing symbols.