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Hi Xue, Could you tell what this other line that appears crossing the histogram represents? Thanks. All the best, Anderson On 30 March 2015 at 07:54, Xue, Feng <[log in to unmask]> wrote: > Dear folks, > > We have encounter this wired distribution of subjects as below. The > attached picture is a frequency of count of certain behavioral in a given > time(did ln(x+1) transformation). We used the count of behavior to > correlate with their gray matter volume and their functional MRI task data. > We got results as below: > 1. without subjects who have zero count of the behavior, we got negative > correlation between the count of behavioral and gray matter volume as well > as between the count of behavior and functional data in a same regions. > This result is very good and makes a lot of sense. > 2. However, when we added in those subjects with zero count of behavior, > those results disappeared. > 3. we also tried to separate subjects into two groups: zero count group > and non-zero count group. But, there was no group difference in either VBM > or functional data. > > Could you please instruct us on how to deal with problem like this? Your > comments or suggestion are greatly appreciated! > [image: Inline image 1] > > -- > Best Regards > > Xue, Feng Ph.D. > > Psychology Department > University of Southern California > Los Angeles CA, 90089 > Mobile: +1 213-249-1040 > ========================================= > XFSL, script that facilitate your neuroimaging > data analysis: http://xfsl.fmri.cn >