This is the data file IMPROVE-5_5_3_1_4.DAT. Source: This example is used on page pri5314.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). This is a follow-up experiment to the data in files IMPROVE-5_5_3_1_1.DAT and IMPROVE-5_5_3_1_3.DAT. It is the second phase of the optimization experiments. 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 ----------------------------------- -1.414 0 147.08 350 72.58 1.414 0 231.92 350 37.42 0 -1.414 189.5 279.3 54.63 0 1.414 189.5 420.7 54.18