Often the questions we ask require us to make accurate predictions on how one factor affects an outcome. If a teacher is asked to work out how time spent writing an essay affects essay grades, it’s ...

The process of using past cost information to predict future costs is called cost estimation. While many methods are used for cost estimation, the least-squares regression method of cost estimation is ...

John A. Jacquez, Frances J. Mather and Charles R. Crawford The theory of simple linear regression is extended to the case of non-uniform error variances for the ...

The default adds a least squares regression line. You can also specify your own reference line by choosing Method:Specification and specifying both the intercept and slope. If you select a Weight ...

It is sometimes desired to fit a second degree polynomial E(y∣ x) = α + β x + γ x 2 to a set of data so that its stationary point will fall in a given region. Methods are shown to calculate a, b, c, ...