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David Herrera

E-mail: dherrer@aol.com
Company/University: daherrera@raytheon.com

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Comments and Ratings by David		View all 1 - 3 of 3
Updated	File	Comments	Rating
05 Oct 2009	press Prediction error sum of squares. Author: Antonio Trujillo-Ortiz	Correction: My computation of PRESS was wrong, and Mr. Antonio Trujillo-Ortiz was absolutely correct in the calculation of PRESS from his code. The problem was that I forgot to place a minus in front of one of the numbers, so I got a slightly different answer. Independently with different code, I got the same answer as Antonio Trujillo-Ortiz, which was 22225.0575. I apologize for the mistake.
04 Oct 2009	press Prediction error sum of squares. Author: Antonio Trujillo-Ortiz	The correct answer is 22225.0, which is correctly stated in the comment section of this code. However, the code does not compute this. Revision needed to compute PRESS value.
04 Oct 2009	press Prediction error sum of squares. Author: Antonio Trujillo-Ortiz	This code does not give the correct answer to the problem stated in Response Surface Methodology by Montgomery & Myers, page 48, which is 22,225. This code gives 21265.2514 by the two different methods in the code. It needs revision. See output below (some variables were printed): Calculation of PRESS n = 14 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 r = 13, c = 3 PRESS = 21265.2514 hii = 0.358818 hii = 0.379259 hii = 0.323410 hii = 0.294624 hii = 0.094723 hii = 0.137715 hii = 0.142682 hii = 0.242150 hii = 0.236885 hii = 0.202703 hii = 0.209627 hii = 0.073729 hii = 0.225672 hii = 0.078004 2nd PRESS = 21265.2514 >>

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