Consider the nisin extraction data in Exercise 12-18. Build regression models for the data using the following
Question:
(a) All possible regressions.
(b) Stepwise regression.
(c) Forward selection.
(d) Backward elimination.
(e) Comment on the models obtained. Which model would you prefer? Why?
Exercise 12-18
An article in Biotechnology Progress (2001, Vol. 17, pp. 366368) reported on an experiment to investigate and optimize nisin extraction in aqueous two-phase systems (ATPS). The nisin recovery was the dependent variable (y). The two regressor variables were concentration (%) of PEG 4000 (denoted as x1 and concentration (%) of Na2SO4 (denoted as x2). The data are in Table E12-10.
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Applied Statistics And Probability For Engineers
ISBN: 9781118539712
6th Edition
Authors: Douglas C. Montgomery, George C. Runger
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