Re: [HCP-Users] tikhonov-regularized partial correlation using FSLnets

2017-08-17 Thread Stephen Smith
Hi This normalisation isn't directly part of the actual L2 regularisation - it is just setting the overall scaling of the covariance matrix, so that the effect of choice of regularisation parameter is not dependent on the overall scaling of the original data. The scaling is just the RMS of

[HCP-Users] tikhonov-regularized partial correlation using FSLnets

2017-08-17 Thread Mary Beth
Hi pals, I have a question about the way partial correlations were estimated for the megatrawl using FSLnets. Going through the 'ridgep' section of nets_netmats.m, it looks like the covariance matrix for each subject is normalized by the square root of the mean of the variances squared - yes, no,