This is the data file IMPROVE-5_5_3_1_1.DAT. Source: This example is used on page pri5311.htm of the e-Handbook to demonstrate an optimization design. Description: The response variable (Y) is the percentage yield of a chemical process. The two factor variables are temperature (in degrees celcius) (X1) and the reaction time (in minutes) (X2). To read into Dataplot, enter SKIP 25 READ "IMPROVE-5_5_3_1_1.DAT" X1 X2 TEMP TIME Y X1 X2 TEMP TIME Y ----------------------------------- -1 -1 170 150 32.79 1 -1 230 150 24.07 -1 1 170 250 48.94 1 1 230 250 52.49 0 0 200 200 38.89 0 0 200 200 48.29 0 0 200 200 29.68 0 0 200 200 46.5 0 0 200 200 44.15