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  2. Nearest neighbor search - Wikipedia

    en.wikipedia.org/wiki/Nearest_neighbor_search

    Nearest neighbor search (NNS), as a form of proximity search, is the optimization problem of finding the point in a given set that is closest (or most similar) to a given point.

  3. Algorithms for calculating variance - Wikipedia

    en.wikipedia.org/wiki/Algorithms_for_calculating...

    This algorithm can easily be adapted to compute the variance of a finite population: simply divide by n instead of n − 1 on the last line.. Because SumSq and (Sum×Sum)/n can be very similar numbers, cancellation can lead to the precision of the result to be much less than the inherent precision of the floating-point arithmetic used to perform the computation.

  4. Hamburg Notation System - Wikipedia

    en.wikipedia.org/wiki/Hamburg_Notation_System

    The Hamburg Sign Language Notation System (HamNoSys) is a transcription system for all sign languages (including American sign language).It has a direct correspondence between symbols and gesture aspects, such as hand location, shape and movement. [1]