One of the recent discussions got me to look closely at our S&P 500 Index changes file. After a long day of QA we made maybe a half dozen delisted symbol additions and another dozen or so corrections. The S&P 500 historical list is in much better shape now, and of course, your backtest results will change a bit too. Most of the changes were in the 2005 - 2007 date range.
Please, Wealth-Lab 7 customers should refresh Wealth-Data History:
Data Manager > Historical Providers > Wealth-Data > right click and Delete Local Files
To reload the data, just run a backtest. The first one will take a little longer to load the data.
Please, Wealth-Lab 7 customers should refresh Wealth-Data History:
Data Manager > Historical Providers > Wealth-Data > right click and Delete Local Files
To reload the data, just run a backtest. The first one will take a little longer to load the data.
Rename
One of the changes was replacing "UA" (Under Armour) Class C shares with "UAA", the Class A shares in the Wealth-Data S&P 500.
Technically, UA remains part of the S&P 500, but we discovered that the Class C didn't exist when Under Armour was added to the index in April 2014. The Class A shares, UAA, were added at that time, while the 'C' shares were added when they were offered after a share split in 2016.
Since different share classes and tracking stocks for the same company tend to have a near 100% correlation, we only include 1 stock for the same company in our Wealth-Data lists. If we didn't, you would almost certainly be buying the same company more than once, using different stocks.
Technically, UA remains part of the S&P 500, but we discovered that the Class C didn't exist when Under Armour was added to the index in April 2014. The Class A shares, UAA, were added at that time, while the 'C' shares were added when they were offered after a share split in 2016.
Since different share classes and tracking stocks for the same company tend to have a near 100% correlation, we only include 1 stock for the same company in our Wealth-Data lists. If we didn't, you would almost certainly be buying the same company more than once, using different stocks.
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