Hi - one thing is that we estimate (z versions of) netmats separately for each 15min run and then average the 4 netmats to give a single netmat per subject. Cheers.
> On 30 Mar 2015, at 18:14, Yizhou Ma <maxxx...@umn.edu> wrote: > > Hi Timothy, > > Thank you for pointing that out. I typed that wrong but I used the correct > transformation in matlab. As I said my transformed z scores are actually > almost perfectly linearly correlated with HCP netmats, though the latter is > much larger. I want to understand why the latter is larger and why the two > are not exactly correlated. > > Thanks, > Cherry > > On Mon, Mar 30, 2015 at 12:08 PM, Timothy Coalson <tsc...@mst.edu > <mailto:tsc...@mst.edu>> wrote: > A quick possibility: if you have pasted in the formula you used, I see an > order of operations problem: .5*ln(1+r)-ln(1-r) means (.5*ln(1+r))-ln(1-r), > where the usual formula is .5*ln((1+r)/(1-r)), which after some log > identities becomes .5*(ln(1+r)-ln(1-r)). > > Tim > > > On Mon, Mar 30, 2015 at 11:02 AM, Yizhou Ma <maxxx...@umn.edu > <mailto:maxxx...@umn.edu>> wrote: > Dear HCP experts, > > I am trying to reproduce the individual netmats from HCP500-PTN so that I am > sure where the numbers come from. I used individual node timeseries in > /ts2/subjID and did correlation in matlab. I then used fisher's z > transformation: .5*ln(1+r)-ln(1-r). The resulting netmat is different from > what is provided in *_netmat1/. However, they almost have a linear > relationship. It seems to me that HCP is not using the same z transformation > I have used. The transformation seems more like 7*ln(1+r)-ln(1-r). > > I have downloaded FSLNets but could not identify which function was used to > generate individual netmats in the first place. The example script seems to > be about group-level netmats only. > > Could you please share with me how exactly the numbers in individual netmats > were generated? > > Thanks, > Cherry > _______________________________________________ > HCP-Users mailing list > HCP-Users@humanconnectome.org <mailto:HCP-Users@humanconnectome.org> > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > <http://lists.humanconnectome.org/mailman/listinfo/hcp-users> > > _______________________________________________ > HCP-Users mailing list > HCP-Users@humanconnectome.org > http://lists.humanconnectome.org/mailman/listinfo/hcp-users > --------------------------------------------------------------------------- Stephen M. Smith, Professor of Biomedical Engineering Associate Director, Oxford University FMRIB Centre FMRIB, JR Hospital, Headington, Oxford OX3 9DU, UK +44 (0) 1865 222726 (fax 222717) st...@fmrib.ox.ac.uk http://www.fmrib.ox.ac.uk/~steve <http://www.fmrib.ox.ac.uk/~steve> --------------------------------------------------------------------------- Stop the cultural destruction of Tibet <http://smithinks.net/> _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
