# least squares

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## least squares

pl.n. Statistics
A method of determining the curve that best describes the relationship between expected and observed sets of data by minimizing the sums of the squares of deviation between observed and expected values.

## least squares

n
(Mathematics) a method for determining the best value of an unknown quantity relating one or more sets of observations or measurements, esp to find a curve that best fits a set of data. It states that the sum of the squares of the deviations of the experimentally determined value from its optimum value should be a minimum

## least′ squares′

n.
a statistical method of estimating values from a set of observations by minimizing the sum of the squares of the differences between the observations and the values to be found.
Also called least′-squares′ meth`od.
[1860–65]
ThesaurusAntonymsRelated WordsSynonymsLegend:
 Noun 1 least squares - a method of fitting a curve to data points so as to minimize the sum of the squares of the distances of the points from the curvemethod of least squaresstatistics - a branch of applied mathematics concerned with the collection and interpretation of quantitative data and the use of probability theory to estimate population parametersstatistical method, statistical procedure - a method of analyzing or representing statistical data; a procedure for calculating a statistic
References in periodicals archive ?
For i [member of] {2, 3, 4} if [s.sub.i] = '1', use robust regression to find a least-squares approximation [f.sub.i] on [MATHEMATICAL EXPRESSION NOT REPRODUCIBLE IN ASCII].
To overcome these shortcomings, weighted orthogonal basis functions are proposed to derive the improved moving least-squares approximation (IMLS).
Therefore, we consider the least-squares approximation of (7), defined as the minimization problem given by

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