That is what it means to add scanner as a nuisance variable. How unbalanced is the design?
On 06/26/2018 01:30 PM, Heidi Lindroth wrote: > > > Hi Bruce, > > > It is a cross-sectional, descriptive analysis. The data has already > been collected. The participants are not evenly distributed. Would it > be appropriate to regress out scanner type if I am using the raw data > (extracted via DKT atlas)? > > > thank you, > > > Heidi Lindroth BSN RN > PhD Candidate| School of Nursing > Program Assistant | School of Medicine and Public Health, Department > of Anesthesiology > Predoctoral Fellow | Veterans Administration (Madison WI) > > University of Wisconsin-Madison > 701 Highland Avenue, Madison WI 53705 > 608-219-4294 | hlindr...@wisc.edu > > ------------------------------------------------------------------------ > *From:* freesurfer-boun...@nmr.mgh.harvard.edu > <freesurfer-boun...@nmr.mgh.harvard.edu> on behalf of Bruce Fischl > <fis...@nmr.mgh.harvard.edu> > *Sent:* Tuesday, June 26, 2018 12:27:35 PM > *To:* Freesurfer support list > *Subject:* Re: [Freesurfer] Adjusting/accounting for between scanner > variance > Hi Heidi > what kind of study are you doing? Usually scanner is included as a > nuisance > regressor, but you also want to make sure that you balance your subject > population across scanner as much as you can > > cheers > Bruce > > > On Tue, 26 Jun 2018, Heidi Lindroth wrote: > > > > > External Email - Use Caution > > > > Hi there, > > Is there a standard method to use for adjusting for between scanner > variance? In the sample I am analyzing, 4 different > > scanners were used. > > > > Thank you, > > > > Heidi Lindroth BSN RN > > PhD Candidate | School of Nursing > > Program Assistant | School of Medicine and Public Health, Department > of Anesthesiology > > Predoctoral Fellow | Veterans Administration (Madison WI) > > > > University of Wisconsin-Madison > > 701 Highland Avenue, Madison WI 53705 > > 608-219-4294 | hlindr...@wisc.edu > > > > > > > > > > > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer _______________________________________________ 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.
