Re: [Freesurfer] matrix is ill-conditioned or badly scaled, condno = 27492.1

Try multiplying the covariate by 100 (after subtracting the mean). On 2/5/16 8:28 AM, Nabin Koirala wrote: I did that but it still does not work, it is almost the same error except the condno is now 15521.8 before it was 27492.1, though I am not sure if that tells something about the error.

Re: [Freesurfer] matrix is ill-conditioned or badly scaled, condno = 27492.1

I did that but it still does not work, it is almost the same error except the condno is now 15521.8 before it was 27492.1, though I am not sure if that tells something about the error. Could it be something else ? Thank you. Regards, Nabin On Thu, Feb 4, 2016 at 5:59 PM, Douglas Greve

Re: [Freesurfer] matrix is ill-conditioned or badly scaled, condno = 27492.1

I'm not sure what the difference is. Compute the mean of the 2nd column, then subtract that number from the values in the 2nd column. doug On 2/2/16 7:30 AM, Nabin Koirala wrote: Thank you for your response . Sorry but for my understanding, should i substract the mean from the data (demean) or

Re: [Freesurfer] matrix is ill-conditioned or badly scaled, condno = 27492.1

Thank you for your response . Sorry but for my understanding, should i substract the mean from the data (demean) or you mean to remove the value which is equal to the mean ? Thank you. Regards, Nabin On Mon, Feb 1, 2016 at 5:21 PM, Douglas N Greve wrote: > Try

Re: [Freesurfer] matrix is ill-conditioned or badly scaled, condno = 27492.1

Try removing the mean from your covariate On 01/30/2016 01:31 PM, Nabin Koirala wrote: > Dear Freesurfer forum, > > 'I am trying to run qdec analysis for a group of subjects to see if > correlation exists but I am getting this error only for this > particular set of data but could not figure

[Freesurfer] matrix is ill-conditioned or badly scaled, condno = 27492.1

Dear Freesurfer forum, 'I am trying to run qdec analysis for a group of subjects to see if correlation exists but I am getting this error only for this particular set of data but could not figure out what is exactly wrong with it. Your suggestion would be greatly appreciated. Following is the