Let X be a random numerical variable. For any value x0, the probability for a new observation to be between x0 and x0 + dx is proportional to dx, and can therefore be written :
Probability (x0 < x < x0 + dx) = p(x0).dx ...
on fuzzy sets introduced the concept of a class with unsharp boundaries and marked the beginning of a new direction by providing a basis for a qualitative approach to the analysis of complex systems in which linguistic rather than numerical variables ...
 See also: Distribution, Regression, Variance, Percept, Categorical variable
  
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