H20/MAT./TEMP/RECYCLE/CAUST SODA/FILTER CLOTH/HOLD TIME EFFECT ON FILTRATION TIME BOX, HUNTER & HUNTER (1978) STATISTIC FOR EXPERIMENTERS WILEY, PAGE 426 2**(7-4) FRACTIONAL FACTORIAL DESIGN NUMBER OF OBSERVATIONS = 8 TOTAL NUMBER OF VARIABLES PER LINE IMAGE = 8 RESPONSE VARIABLE = FILTRATION TIME (IN MINUTES) FACTOR 1 = WATER SUPPLY SOURCE (2 LEVELS--TOWN & WELL) FACTOR 2 = RAW MATERIAL SOURCE (2 LEVELS--ON SITE & OTHER) FACTOR 3 = TEMPERATURE (2 LEVELS--LOW & HIGH) FACTOR 4 = RECYCLE (2 LEVELS--YES & NO) FACTOR 5 = CAUSTIC SODA ADDITION RATE (2 LEVELS--FAST & SLOW) FACTOR 6 = FILTER CLOTH OLD (2 LEVELS--NEW & OLD) FACTOR 7 = HOLDUP TIME (2 LEVELS--LOW & HIGH) TO READ THIS FILE INTO DATAPLOT-- DIMENSION 20 VARIABLES SKIP 25 READ BOXFILT.DAT Y X1 TO X7 Y X1 X2 X3 X4 X5 X6 X7 --------------------------------- 68.4 -1 -1 -1 +1 +1 +1 -1 77.7 +1 -1 -1 -1 -1 +1 +1 66.4 -1 +1 -1 -1 +1 -1 +1 81.0 +1 +1 -1 +1 -1 -1 -1 78.6 -1 -1 +1 +1 -1 -1 +1 41.2 +1 -1 +1 -1 +1 -1 -1 68.7 -1 +1 +1 -1 -1 +1 -1 38.7 +1 +1 +1 +1 +1 +1 +1