THIS IS DATAPLOT DATA FILE HALD647.DAT HEAT YIELD IN HARDENING OF PORTLAND CEMENT REFERENCE--HALD, A., STATISTICAL THEORY WITH ENGINEERING APPLICATIONS, WILEY, NEW YORK, 1952, PAGE 647. REFERENCE--DANIEL, CUTHERBERT, AND WOOD, FRED S. FITTING EQUATIONS TO DATA, WILEY, NEW YORK, 1971, PAGES 89 AND 100. NUMBER OF OBSERVATIONS = 13 NUMBER OF VARIABLES PER LINE IMAGE = 5 ORDER OF VARIABLES PER LINE IMAGE-- RESPONSE VARIABLE Y = HEAT EVOLVED (CAL/GRAM OF CEMENT) FACTOR 1 = CONCENTRATION OF COMPOUND 1 FACTOR 2 = CONCENTRATION OF COMPOUND 2 FACTOR 3 = CONCENTRATION OF COMPOUND 3 FACTOR 4 = CONCENTRATION OF COMPOUND 4 STATISTICAL CLASSIFICATION--REGRESSION ALL-POSSIBLE SUBSETS REGRESSION TO READ THIS INTO DATAPLOT-- SKIP 25 READ HALD647.DAT Y X1 X2 X3 X4 HEAT CONC CONC CONC CONC YIELD 1 2 3 4 ----------------------------- 78.5 7 26 6 60 74.3 1 29 15 52 104.3 11 56 8 20 87.6 11 31 8 47 95.9 7 52 6 33 109.2 11 55 9 22 102.7 3 71 17 6 72.5 1 31 22 44 93.1 2 54 18 22 115.9 21 47 4 26 83.8 1 40 23 34 113.3 11 66 9 12 109.4 10 68 8 12