Because clean data matters!
You can not create winning strategies with bad data!
Outliers, impossible fills, unaccounted special dividends, poorly-handled splits, data cliffs due to corporate dilutions, and the list goes on. Today your backtests are chock full of unrealistic hypothetical results because data providers are not careful to distribute reliable data for traders to use when backtesting their strategies. Furthermore, a majority of traders are not even aware that nearly all data providers supply the wrong value for the most-used order type. If you don't know what we're talking about, you better keep reading...Read more
WEALTH DATA CAN SOLVE THIS!
You think you had all the data, but upon closer inspection you find multiple incomplete series that your provider doesn't care to correct. Just like other data errors, missing data affect indicator calculations and bars on which trades [should have] taken place.
Your backtests use Open, High, and Low values that a) may not have occurred in the open market (e.g., an option trade print), or, b) were outliers - often small lot trades that actually occurred but were not representative of the inside market. Data providers generally agree on these values, but Wealth-Data often does not!
Test without bias due to merger and acquisition (M&A) activity, splits, reverse splits, and special dividends.
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