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 Latin Hypercube Sampling
The use of a constrained random experimental design as a point selection scheme for response approximation.
 Least Squares Approximation
The determination of the coefficients in a mathematical expression so that it approximates certain experimental results by the minimization of the sum of the squares of the approximation errors. Used to determine response surfaces as well as calibrating analysis models.
 Local Approximation
See Gradient vector.
 Local variable
A variable of which the scope is limited to a particular discipline or disciplines. Used in the MDO context.