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Automated detection of null field values and effectively null field values

  • US 8,489,617 B2
  • Filed: 06/05/2012
  • Issued: 07/16/2013
  • Est. Priority Date: 04/24/2008
  • Status: Active Grant
First Claim
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1. A computer implemented method of detecting and treating one or more field values as null field values in records of an electronic database, the computer implemented method comprising:

  • selecting a field of the records;

    determining, using a programmed computer, a frequency for each field value of the field, the frequency comprising an amount of the records in which the field value of the field appears;

    calculating, using a programmed computer, a critical frequency for the field based on an ordered histogram of the frequency of each field value of the field, the critical frequency comprising a frequency at which a first point of a derivative of the ordered histogram decreases below a threshold; and

    treating, using a programmed computer, each field value of the field with a_frequency that is greater than the critical frequency of the field as a null field value and each field value of the field with a frequency that is less than the critical frequency of the field as a non-null field value.

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