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> 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> 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 >> http://lists.humanconnectome.org/mailman/listinfo/hcp-users >> > > _______________________________________________ HCP-Users mailing list HCP-Users@humanconnectome.org http://lists.humanconnectome.org/mailman/listinfo/hcp-users
