Good–Turing frequency estimation
Statistical technique invented by developed by Alan Turing and his assistant I. J. Good / From Wikipedia, the free encyclopedia
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Good–Turing frequency estimation is a statistical technique for estimating the probability of encountering an object of a hitherto unseen species, given a set of past observations of objects from different species. In drawing balls from an urn, the 'objects' would be balls and the 'species' would be the distinct colors of the balls (finite but unknown in number). After drawing red balls, black balls and green balls, we would ask what is the probability of drawing a red ball, a black ball, a green ball or one of a previously unseen color.