An artificial data set suggested by N. Mantel to illustrate stepwise regression methods.
A data frame with 5 observations on the following 4 variables.
Mantel, N. (1970). Why stepdown procedures in variable selection? Technometrics, 12, 621–625.
Weisberg, S. (2005). Applied Linear Regression, 3rd edition. New York: Wiley, Problem 10.2.
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