Hi Jurgen, I don't think it is too unusual to do this kind of thing, ie, a paired test where pairing is based on gender, age, and education, but you know your data and field better than I do. It is not the case that one is more conservative than another (they are the same) assuming that the underlying assumptions are met. The underlying assumptions are more stringent for the paired than for the unpaired. doug
On 07/24/2012 06:22 AM, Jürgen Hänggi wrote: > Dear statistic experts > > We have done statistics between two independent groups using an independent > t-test. One group consistent of 13 male patients and the other group > consistent of 13 male control subjects who were matched to the patients with > respect to age and education (in years). > > The reviewer proposed that it might be more appropriate to use a paired > t-test. > However, we can imaging a design where such an approach is adequate e.g. > monozygotic twins reared in shared environments who are discordant for a > particular trait. > > In our opinion, the matching of only age and education is not sufficient in > order to apply a paired t-test. > In addition, the paired t-test is more anti-conservative than the > independent t-test and therefore advantages our hypothesis and this might be > identified as a statistical "trick" by other reviewers. > > Any comment about whether or not the suggested paired t-test is appropriate > in our study is highly appreciated. > > Thanks in advance > Regards > Jürgen Hänggi > > ---------------------------------------------------------------------------- > Jürgen Hänggi, Ph.D. > Division Neuropsychology > Institute of Psychology > University of Zurich > Binzmuehlestrasse 14, PO Box 25 > 8050 Zurich, Switzerland > 0041 44 635 73 97 (phone office) > 0041 76 445 86 84 (phone mobile) > 0041 44 635 74 09 (fax office) > BIN 4.D.04 (office room number) > j.haenggi[at]psychologie.uzh.ch (email) > http://www.psychologie.uzh.ch/neuropsy/ (website) > http://www.juergenhaenggi.ch (private website) > > This e-mail (and any attachment/s) contains confidential and/or privileged > information. If you are not the intended recipient (or have received this > e-mail in error) please notify the sender immediately and destroy this > e-mail. Any unauthorised copying, disclosure or distribution of the > material in this e-mail is strictly forbidden. > ---------------------------------------------------------------------------- > > > > > _______________________________________________ > Freesurfer mailing list > [email protected] > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > > -- Douglas N. Greve, Ph.D. MGH-NMR Center [email protected] Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: www.nmr.mgh.harvard.edu/facility/filedrop/index.html _______________________________________________ Freesurfer mailing list [email protected] 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.
