Patent ID: 7890514

Claim:
A computer-readable storage medium, comprising code representing instructions to cause a processor to: identify a plurality of concepts present in an unstructured object present in a corpus of unstructured objects; define a Gaussian distribution representing a number of occurrences of each concept in the plurality of concepts present in the unstructured object; calculate a weighted value for a first concept from the plurality of concepts, the weighted value being based at least in part on at least one of: a number of occurrences of the first concept in the unstructured object; a ratio of a number of categories in which the first concept occurs to a total number of all categories; a ratio of a frequency of occurrence of the first concept in the unstructured object to a frequency of occurrence of the first concept in the corpus; or a ratio of a number of occurrences of the first concept in the unstructured object to a total number of all concepts, including the plurality of concepts, that occur in the unstructured object; determine that the weighted value is greater than a first threshold value and less than a second threshold value, the first threshold value being five or fewer standard deviations below a mean weighted value of the Gaussian distribution, the second threshold value being five or fewer standard deviations above the mean weighted value of the Gaussian distribution; and identify the first concept as a key concept associated with the unstructured object, the key concept representing a meaning of the unstructured object.