Dear FSL Experts,
I have been using FLAME 1+2 with my small n group analyses and have noticed in the report logs two different kinds of warning messages regarding the higher levels stats. I need to understand these warnings in order to determine if they render my results invalid since I seem to get very different results with FLAME 1 and Flame 1 and 2.
(1) Numerous, consecutive warnings that "the passed in varicope file, tmpvarcope(repeating message for 0013, 0014--etc) contains voxels in the mask with zero (or negative) values. These voxesl will be excluded from the analysis." Not all of these warnings are followed by the second type below:
and then with some of the stats:
(2) Warning: FLAME stage 2 has given an abnormally large difference to stage 1
See examples below.
Do these warning indicate that the analysis is not valid?
Thanks so much,
The humbly confused Nan Wise
Rutgers_Newark
WARNING: The passed in varcope file, tmpvarcope0020, contains voxels inside the mask with zero (or negative) values. These voxels will be excluded from the analysis. nevs=2 ntpts=9 ngs=2 nvoxels=1069 Running: nmaskvoxels=1069 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 nmaskvoxels=191 njumps = 10000 burnin = 500 sampleevery = 1 nsamples = 9500 Metropolis Hasting Sampling Number of voxels=191 Percentage done: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 WARNING: FLAME stage 2 has given an abnormally large difference to stage 1 x=59,y=69,z=0 zts[0](x,y,z)=-5.80533 zflame1lowerts[0](x,y,z)=-1.79699 beta_mean[0](x,y,z)=0.256415 beta_b[0](x,y,z)/beta_c[0](x,y,z)=0.361611 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Saving
WARNING: The passed in varcope file, tmpvarcope0021, contains voxels inside the mask with zero (or negative) values. These voxels will be excluded from the analysis. nevs=2 ntpts=9 ngs=2 nvoxels=1312 Running: nmaskvoxels=1312 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 nmaskvoxels=255 njumps = 10000 burnin = 500 sampleevery = 1 nsamples = 9500
results
Metropolis Hasting Sampling Number of voxels=255 Percentage done: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 WARNING: FLAME stage 2 has given an abnormally large difference to stage 1 x=30,y=46,z=0 zts[0](x,y,z)=4.58282 zflame1lowerts[0](x,y,z)=1.44174 beta_mean[0](x,y,z)=0.267599 beta_b[0](x,y,z)/beta_c[0](x,y,z)=0.713108 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 Saving results
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