Hi Bruce,
I am so sorry that I am wrong. What I want to say is that It isn't necessary to corrected by sex. Is it right? Thanks a lot! Zheng 在 2017-12-03 02:51:03，"Bruce Fischl" <fis...@nmr.mgh.harvard.edu> 写道： >I think you probably should since you don't want whatever you find to >only reflect differences in head size > >cheers >Bruce >On Sat, 2 Dec 2017, 郑凤莲 wrote: > >> Hi Bruce, >> >> I think I get it. I have 27 males and 28 females and 26 males. It isn't >> necessary to corrected by eTIV. Is it right? >> >> Thanks a lot ! >> Zheng >> >> >> >> >> >> At 2017-12-02 11:45:10, "Bruce Fischl" <fis...@nmr.mgh.harvard.edu> wrote: >> >Hi Zheng >> > >> >For volume, usually including eTIV reduces the variance and increases power >> >more than you lose for having one additional regressor. Not sure about >> >gender - how unbalanced is your sample? You might be ok with just eTIV >> >Bruce >> > >> > >> >On Sat, 2 Dec 2017, 郑凤莲 >> >wrote: >> > >> >> Hi professor, >> >> >> >> I am using Freesurfer 6.0 and get the volume of subcortical >> >> structures. I want to get the relationship between age a >> nd >> >> volume. I only have one group, is it necessary to take gender and eTIV >> >> as a covariate? If it is necessary, Which >> >> statistical analysis should be used? >> >> I really appreciate your help. Thanks a lot. >> >> >> >> Sincerely, >> >> Zheng >> >> >> >> >> >> >> >> >> >> >> >> >> >> >>
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