MTB > read 'huitema.dat' c1-c6 30 ROWS READ ROW C1 C2 C3 C4 C5 C6 1 15 29 3 1 0 1 2 19 49 3 1 0 1 3 21 48 2 1 0 1 4 27 35 5 1 0 1 . . . MTB > desc c1-c3; SUBC> by c6. C6 N MEAN MEDIAN TRMEAN STDEV SEMEAN C1 1 10 30.00 30.00 29.38 10.87 3.44 2 10 39.00 41.00 39.50 9.98 3.16 3 10 36.00 36.00 36.25 13.23 4.18 C2 1 10 52.00 48.50 52.13 14.96 4.73 2 10 47.00 50.50 48.00 14.13 4.47 3 10 49.00 46.50 47.37 14.48 4.58 C3 1 10 5.100 5.000 5.000 2.378 0.752 2 10 4.800 4.500 4.750 1.814 0.573 3 10 5.100 4.500 5.125 2.767 0.875 C6 MIN MAX Q1 Q3 C1 1 15.00 50.00 20.50 38.25 2 20.00 54.00 32.50 46.25 3 14.00 56.00 27.50 45.00 C2 1 29.00 74.00 43.25 68.25 2 22.00 64.00 38.25 56.50 3 33.00 78.00 35.75 58.50 C3 1 2.000 9.000 3.000 7.250 2 2.000 8.000 3.750 6.250 3 1.000 9.000 2.750 8.000 MTB > ancova c1=c6 Factor Levels Values C6 3 1 2 3 Analysis of Variance for C1 Source DF SS MS F P C6 2 420.0 210.0 1.60 0.220 Error 27 3536.0 131.0 Total 29 3956.0 MTB > oneway c1 c6 ANALYSIS OF VARIANCE ON C1 SOURCE DF SS MS F p C6 2 420 210 1.60 0.220 ERROR 27 3536 131 TOTAL 29 3956 INDIVIDUAL 95 PCT CI'S FOR MEAN BASED ON POOLED STDEV LEVEL N MEAN STDEV --------+---------+---------+-------- 1 10 30.00 10.87 (----------*---------) 2 10 39.00 9.98 (----------*---------) 3 10 36.00 13.23 (---------*----------) --------+---------+---------+-------- POOLED STDEV = 11.44 28.0 35.0 42.0 MTB > ancova c1 = c6; SUBC> covariates c2 c3. Factor Levels Values C6 3 1 2 3 Analysis of Covariance for C1 Source DF ADJ SS MS F P Covariates 2 2563.56 1281.78 32.95 0.000 C6 2 624.74 312.37 8.03 0.002 Error 25 972.44 38.90 Total 29 3956.00 Covariate Coeff Stdev t-value P C2 0.2766 0.108 2.571 0.016 C3 2.8349 0.664 4.267 0.000 MTB > regress c1 4 c4 c5 c2 c3 The regression equation is C1 = 7.99 - 6.83 C4 + 4.40 C5 + 0.277 C2 + 2.83 C3 Predictor Coef Stdev t-ratio p Constant 7.989 4.503 1.77 0.088 C4 -6.830 2.808 -2.43 0.022 C5 4.404 2.795 1.58 0.128 C2 0.2766 0.1076 2.57 0.016 C3 2.8349 0.6644 4.27 0.000 s = 6.237 R-sq = 75.4% R-sq(adj) = 71.5% Analysis of Variance SOURCE DF SS MS F p Regression 4 2983.56 745.89 19.18 0.000 Error 25 972.44 38.90 Total 29 3956.00 SOURCE DF SEQ SS C4 1 375.00 C5 1 45.00 C2 1 1855.35 C3 1 708.21 Unusual Observations Obs. C4 C1 Fit Stdev.Fit Residual St.Resid 20 0.00 54.00 41.50 2.08 12.50 2.13R R denotes an obs. with a large st. resid. MTB > regress c1 2 c2 c3 The regression equation is C1 = 9.60 + 0.212 C2 + 2.99 C3 Predictor Coef Stdev t-ratio p Constant 9.602 5.166 1.86 0.074 C2 0.2119 0.1311 1.62 0.118 C3 2.9884 0.8170 3.66 0.001 s = 7.691 R-sq = 59.6% R-sq(adj) = 56.6% Analysis of Variance SOURCE DF SS MS F p Regression 2 2358.8 1179.4 19.94 0.000 Error 27 1597.2 59.2 Total 29 3956.0 SOURCE DF SEQ SS C2 1 1567.4 C3 1 791.5 Unusual Observations Obs. C2 C1 Fit Stdev.Fit Residual St.Resid 20 54.0 54.00 35.99 1.53 18.01 2.39R R denotes an obs. with a large st. resid.