This is Dataplot data file VANGEL32.DAT Compressive Strength for Graphite/Epoxy Tape Source--Vangel, Mark, G. Design Allowables from Regression Models Using Data from Several Batches", ASTM STP 1274, 1996. --Shyprykevich, ASTM STP 1003, 1989. Number of observations = 45 Number of varibles per line image = 32 Order of variables on a line image-- 1. Response variable = strength (MPa) 2. Factor 1 = temperature (degrees F) 3. Factor 2 = batch (3 levels) Statistical Classification--Regression, Tolerance Limits Engineering question--What are the B-basis (= lower 95% confidence for 10% point) values based on a linear fit? To read this file into Dataplot (and do RECIPE tolerance limits)-- SKIP 25 READ VANGEL32.DAT Y X B RECIPE CONTENT 90 RECIPE CONFIDENCE 95 RECIPE DEGREE 1 LET X2 = SEQUENCE -75 35 200 RECIPE FIT Y X B X2 Strength Temperature Batch Y X B ----------------------------------------- 1349.80 -75 1 1196.70 -75 1 1457.10 -75 1 1368.60 -75 1 1310.30 -75 1 863.60 75 1 991.50 75 1 991.50 75 1 1254.90 75 1 921.90 75 1 846.00 200 1 949.80 200 1 845.50 200 1 912.00 200 1 903.60 200 1 1069.60 -75 2 1074.70 -75 2 1084.20 -75 2 1009.70 -75 2 1079.70 -75 2 968.90 75 2 966.50 75 2 975.70 75 2 934.90 75 2 944.70 75 2 855.30 200 2 856.00 200 2 842.20 200 2 806.50 200 2 814.30 200 2 1145.70 -75 3 1250.10 -75 3 1340.70 -75 3 1346.90 -75 3 1074.70 -75 3 1046.80 75 3 1145.70 75 3 1032.80 75 3 1024.80 75 3 1000.40 75 3 872.90 200 3 816.40 200 3 824.30 200 3 898.50 200 3 832.80 200 3