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Re:Introduction to Zipline: A Trading Library for Python by chollida1 on Tuesday July 26, 2016 @12:01AM (#12163236)
I think you misunderstood, or I wasn't clear:)

The reason they have clean data is that big firms have teams of people dedicated to just cleaning data.

The little guy has to spend time cleaning data even before he/she starts to compete.

Re:Introduction to Zipline: A Trading Library for Python by SEJeff on Tuesday July 26, 2016 @06:47PM (#12169298)
Right, I'm saying I work at one of said firms. The data even then isn't clean, just cleaner. Perhaps I'm just too pedantic :)