I think the gamma/rstd what you want. doug
On 11/07/2013 08:14 AM, 陈骥 wrote: > > > Dear freesurfer experts > > > > > In qdec I use the DODS degsin to obtain the thickness difference > between my two groups with age ,gender as nuisance.Then I want to get > the effect size map instead of report the significance level. In > freesurfer wiki I found that we can obtain the effect size map via > gamma/sqrt(gammavar*Npilot), where Npilot is the number subjects in > the pilot study.While I have two groups,one control group with 25 > subjects and one patient group with 25 subjects too,I doubt that which > number I should use ,the number of patient group subjects 25 or for > the whole subjects across groups 50 to repalce the Npilot in the equation? > And then I look for previous relevant topic in the freesurfer mail > list, found that doug suggested that we can get the effect size just > use gamma/rstd, I tried for that but found completely different result > between I use the equation of gamma/sqrt(gammavar*Npilot), which > equation should I use for I want to get the Cohen'd effect size map? > Thank you in advance for your helps! > Ji Chen > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
