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Trading Techniques | FEB 2011
How Good Is Your Data? by Sunny Harris
Is all data equal? If truth be told, I never gave it much thought. I have been using one vendor nearly exclusively for about 20 years. My fills are good enough. My closing prices seem to match what I see on television or find online. As long as the profits roll in, there has been no reason to question the data. But then I was told by another vendor that my vendor’s data is off by just enough to generate a side income, through the slippage from actual price to the price I am presented. My curiosity was piqued, and so I decided to investigate. First, I set up a spreadsheet and compared the two vendors. To keep it simple, I considered only the past five years of data. My data experiment ran from June 30, 2005, to June 29, 2010.
by Sunny Harris
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