Hi, Using package gclus in R, I have created some graphs that show the trends within subgroups of data and correlations among 9 variables (v1-v9). Being interested for more details on these data I have produced also the var-covar matrices. Question: From a pair of two subsets of data (with 9 variables each, I have two var-covar matrices for each subgroup, that differ for a treatment on one group (treatment A) vs (non-Treatment A).
Is there a software that can compare if two var-covar matrices are statistically the same? Below are a pair of two matrices, from several others. Thank you in advance for any input. Aldi First group var-covar matrix (the data were under treatment a) v1 v2 v3 v4 v5 v6 v7 v8 v9 v1 730.87 3.406 -283.41 -74.68 107.57 -1355.13 -112.46 14.000 5.776 v2 3.41 24.950 105.45 -121.31 -307.68 -285.40 29.65 -2.500 -7.796 v3 -283.41 105.451 6292.19 -2676.46 -970.80 29296.23 10715.29 3.156 -66.313 v4 -74.68 -121.307 -2676.46 124492.30 -2289.47 -20377.34 -409.71 183.500 563.102 v5 107.57 -307.681 -970.80 -2289.47 7045.62 12118.09 954.51 38.258 96.355 v6 -1355.13 -285.404 29296.23 -20377.34 12118.09 218555.93 70126.71 137.000 -130.667 v7 -112.46 29.645 10715.29 -409.71 954.51 70126.71 28239.57 67.989 -26.370 v8 14.00 -2.500 3.16 183.50 38.26 137.00 67.99 24.500 9.000 v9 5.78 -7.796 -66.31 563.10 96.35 -130.67 -26.37 9.000 22.776 Second group var-covar matrix (the data were NOT under treatment a) v1 v2 v3 v4 v5 v6 v7 v8 v9 v1 2696.25 27.05 201.06 2745.54 -344.39 540.48 654.20 34.363 7.623 v2 27.05 86.37 -96.89 -497.28 -1185.10 -3108.71 -910.38 -4.254 -9.115 v3 201.06 -96.89 10647.26 8378.07 595.81 66122.43 26237.21 -65.093 -51.998 v4 2745.54 -497.28 8378.07 408391.25 -3887.28 40477.40 30652.01 450.539 50.311 v5 -344.39 -1185.10 595.81 -3887.28 29204.00 65320.00 15238.41 -98.237 102.975 v6 540.48 -3108.71 66122.43 40477.40 65320.00 549955.14 194691.90 -555.552 -95.210 v7 654.20 -910.38 26237.21 30652.01 15238.41 194691.90 82698.88 -70.417 -75.585 v8 34.36 -4.25 -65.09 450.54 -98.24 -555.55 -70.42 79.689 8.164 v9 7.62 -9.11 -52.00 50.31 102.97 -95.21 -75.58 8.164 30.492 ______________________________________________ R-help@stat.math.ethz.ch mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
