This is Dataplot data file NATR627.DAT Cubic Polynomial Regression Example Question: What cubic polynomial relates Y to X? Source--Natella, Mary G. (1963). Experimental Statistics. National Bureau of Standards Handbook 91. U.S. Government Printing Office. Page 6-27 to 6-42. Number of observations = 7 Number of variables per line image = 2 Order of variables on a line image-- 1. Response Variable Y = response 2. Factor 1 X = factor 1 To read this file into Dataplot-- SKIP 25 READ NATR627.DAT Y X CUBIC FIT Y X Y X ------------ 3.4 10 11.7 20 37.2 30 80.1 40 151.4 50 253.2 60 392.6 70