Hi Bruce,
Thanks for your quick reply. These results are not correted by eTIV, If eTIV are corrected, I can only get the p value and scatter plot, I can't get the line trend. Do you know how to get the line trend with eTIV corrected as these results?
Thanks, Zheng
在 2017-11-22 10:14:16，"Bruce Fischl" fischl@nmr.mgh.harvard.edu 写道：
is this eTIV corrected? I would look at some of the outliers and make sure that the segmentations are accurate. Certainly the trend is in the correct (and depressing) direction.
cheers Bruce On Wed, 22 Nov 2017, 郑凤莲 wrote:
Hi Bruce,
Thanks for your advice. There are a part of the result. Blue color stands women, and Red colorstands men. The number of the data is not enough large. Are they ok? May I use them in my paper? [IMAGE][IMAGE][IMAGE]
Thanks a lot ! Zheng
At 2017-11-20 10:15:49, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:
Hi Zheng
I would scatter plot age vs. volume, coloring men and women differently (or different symbols) with and without eTIV correction to get an idea of what is going on
cheers Bruce
On Mon, 20 Nov 2017, 郑凤莲 wrote:
Hi Bruce,
My data is loss from 35 to 40. But the uniform of sex is not well from 40 to 55 and from 56 to 71. I did the correlation analysis between age and volume. I don't know how I can explain this problem. Thanks again.
Sincerely, Zheng
At 2017-11-20 09:35:45, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote:
Hi Zheng
how uniform is your distribution? I'm hardly an expert on this, but I wouldn't expect very large effects until you get into the older end of that range. Have you scatter plotted your data? Bruce On Mon, 20 Nov 2017, 郑凤莲 wrote:
Hi Bruce,
Thank you for your help. I have 54 subjects, aged from 21 to 71 and only one group. I want to compare the change of
hippocampus volume with age. The results before and after doing the correction for eTIV are th
e
same. Where is wrong? Or if there is no error, how can I explain it in discussion?
Thanks, Zheng
At 2017-11-20 04:55:49, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote: >Hi Zheng > >yes, I see. Maybe the effect is smaller than you have the power to see, or >there is no effect? You would need to give us more details for us to help. >Are you correcting for eTIV? What measure are you comparing? > >cheers >Bruce > On Sun, 19 Nov 2017, 郑凤莲 wrote: > >> Hi Bruce, >> >> I am sorry for this situation. >> In the first way, there was an statistical difference in left hippocampus, but no diff
ere
nce
in >> right hippocampus. In the second way, there was both no statistical difference in left or >> right hippocampus. I don't know what causes this result. >> Can you understand me this time? >> >> Thanks, >> Zheng >> >> >> >> >> At 2017-11-18 22:58:56, "Bruce Fischl" fischl@nmr.mgh.harvard.edu wrote: >> >Hi Zheng >> > >> >no difference between what and what? >> > >> >cheers >> >Bruce >> >On Fri, 17 Nov 2017, 郑凤莲 wrote: >> > >> >> Hi professor, >> >> >> >> I am using Freesurfer for DTI data. When I run 'mri_segstats', I >> >> got the result that there w >> as >> >> an obvious difference in left hippocampus, but no difference in right hippocampus. Then,
I
run
>> >> segmentation of hippocampus subfields. The result showed there is no difference in total
le
ft
or >> >> right hippocampus, and only in two right hippocampus subfields has significant differenc
e.
Why
is >> >> there inconsistent result in two means? >> >> Thank you very much. >> >> >> >> Sincerely, >> >> Zheng >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >> >>