When I adjusted for the scale, the matrix is still ill-conditioned. It looks like some of the columns are very similar to each other. doug
On 06/12/2012 05:15 PM, mdkruepke@uwalumni.com wrote:
Hello-
I am trying to analyze the cortical thickness between two groups of subjects Cl1 and CL2. When i run the GLM i receive the error:
matrix is ill-conditioned or badly scaled, condno = 1e+08
I am under the impression the error could be due to the non-uniformity in the range/scale of the regressors.
here is my information:
contrast is 1 -1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
- mri_glmfit --y lh.PvNPeverything.10.mgh --fsgd PvNPeverything.fsgd
dods --C PvNP_everything.mtx --surf UNM_ALLGOOD lh --cortex --glmdir lh.PvNPeverything.glmdir
- (sample of my fsgd) - there are no columns with all 0's in them
GroupDescriptorFile 1 Title Methedone Comparison Class Cl1 Class Cl2 Variables WAISIQtrait_anxietyalcohol_yearheroin_yearcocaine_yearcannabis_yearmeth_yearamphetamines_yearmeth_amphet_yearhallucinogens_year
inhalants_yearmethodne_yearopiates_yearpills_yearopitates_pills_yearother_year total_years InputM87160505Cl18633103911011180066049 InputM87161888Cl11095900722000000000032 InputM87107477Cl1893412091309961001910057 InputM87199897Cl11174402301000000915015360 InputM87146570Cl1944226038000000000637 InputM87189755Cl111159110.52150331.500000036 InputM87169696Cl18622201114000000000025 InputM87187366Cl11065128027002020000000075 InputM87178857Cl211748044805570400.080.08042.08 InputM87165923Cl21034052015000000011023 InputM87110556Cl21346040115000000000020 InputM87183811Cl2974315083000000000026
- design matrix
1 0 86 0 33 0 10 0 3 0 9 0 11 0 0 0 1 0 1 0 1 0 8 0 0 0 0 0 6 0 6 0 0 0 49 0 1 0 109 0 59 0 0 0 0 0 7 0 22 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 32 0 1 0 89 0 34 0 12 0 0 0 9 0 13 0 0 0 9 0 9 0 6 0 10 0 0 0 1 0 9 0 10 0 0 0 57 0 1 0 89 0 40 0 15 0 5 0 2 0 30 0 10 0 0 0 10 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 59 0 1 0 77 0 44 0 0 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 1 0 91 0 22 0 6 0 0 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8 0 1 0 103 0 29 0 20 0 3 0 11 0 27 0 0 0 11 0 11 0 5 0 0 0 0 0 0 0 1 0 1 0 0 0 78 0 1 0 117 0 44 0 0 0 23 0 0 0 10 0 0 0 0 0 0 0 0 0 0 0 9 0 15 0 0 0 15 0 3 0 60 0 1 0 94 0 42 0 26 0 0 0 3 0 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 0 37 0 1 0 91 0 38 0 20 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 20 0 1 0 86 0 45 0 3 0 1 0 2 0 7 0 0 0 0 0 0 0 1 0 0 0 0 0 1 0 0 0 1 0 1 0 14 0 1 0 114 0 50 0 5 0 1 0 3 0 10 0 0 0 0.08 0 0.08 0 0 0 0 0 0.33 0 1 0 0 0 1 0 0 0 20.42 0 1 0 109 0 27 0 5 0 5 0 4 0 14 0 0 0 0 0 0 0 5 0 0 0 0 0 1 0 4 0 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0 0 0 0 6
-- Michael D. Kruepke PhD - University of Illinois at Urbana-Champaign BA - Psych - University of Wisconsin-Madison mdkruepke@gmail.com mailto:mdkruepke@gmail.com (262)-483-7449
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