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  2. Wide and narrow data - Wikipedia

    en.wikipedia.org/wiki/Wide_and_narrow_data

    The pandas package in Python implements this operation as "melt" function which converts a wide table to a narrow one. The process of converting a narrow table to wide table is generally referred to as "pivoting" in the context of data transformations.

  3. Winsorizing - Wikipedia

    en.wikipedia.org/wiki/Winsorizing

    A typical strategy to account for, without eliminating altogether, these outlier values is to 'reset' outliers to a specified percentile (or an upper and lower percentile) of the data. For example, a 90% winsorization would see all data below the 5th percentile set to the 5th percentile, and all data above the 95th percentile set to the 95th ...

  4. pandas (software) - Wikipedia

    en.wikipedia.org/wiki/Pandas_(software)

    Because column names are stored as an index, these are not required to be unique. [9]: 103–105 If data is a Series, then data['a'] returns all values with the index value of a. However, if data is a DataFrame, then data['a'] returns all values in the column(s) named a.

  5. Entity–attribute–value model - Wikipedia

    en.wikipedia.org/wiki/Entity–attribute–value...

    Coercing all values into strings, as in the EAV data example above, results in a simple, but non-scalable, structure: constant data type inter-conversions are required if one wants to do anything with the values, and an index on the value column of an EAV table is essentially useless.

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  7. If I Could Only Buy and Hold a Single Stock, This Would Be It

    www.aol.com/could-only-buy-hold-single-113000923...

    A jar of $100 bills on a wooden table. Image source: Getty Images. ... management navigated numerous challenges while finding opportunities to expand its product offerings and grow its value ...

  8. Database index - Wikipedia

    en.wikipedia.org/wiki/Database_index

    The data rows may be spread throughout the table regardless of the value of the indexed column or expression. The non-clustered index tree contains the index keys in sorted order, with the leaf level of the index containing the pointer to the record (page and the row number in the data page in page-organized engines; row offset in file ...

  9. Michael D. O’Halleran - Pay Pals - The Huffington Post

    data.huffingtonpost.com/paypals/michael-d-o-halleran

    The Michael D. O’Halleran Stock Index From January 2008 to August 2009, if you bought shares in companies when Michael D. O’Halleran joined the board, and sold them when he left, you would have a -39.6 percent return on your investment, compared to a -30.5 percent return from the S&P 500.