The former...I think. Essentially, what I would like to do is to generate a method by which I can obtain z-score images from single subjects' log-transformed Jacobian determinants relative to a large population mean and SD Jacobian determinant images. I already have log-transformed Jacobians determinant values for these few subjects relative to a normal elderly population atlas, but what I'd really like to know is how much these subjects differed from the atlas in z-score values (i.e., translation of log-transformed Jacobians to z-scores). Maybe there's a different (or more appropriate) way to do this? BTW - we don't have AFNI revved up for use. I know, I know... ;) Jeff ---- "MCLAREN wrote: > Jeff, > > Are you wanting the pure standard deviation or the residuals from a multiple > regression? > > I believe if you mean center your data (3ddetrend in AFNI), you can then run > 3dTstat in AFNI to get the standard deviations. > > On Mon, Mar 16, 2009 at 12:18 PM, Jeff Browndyke <[log in to unmask]>wrote: > > > Does anyone have a formula for imCalc or a batch script to generate a > > population standard deviation image (i.e., sigma)? I'd like to generate > > such an image for a group of log-transformed, Jacobians determinants for > > eventual entry into a standard z-score conversion formula. > > > > Thanks, > > Jeff Browndyke > > > > ---------------------- > > Duke Univ. Med. Center > > Dept. of Psychiatry > > > > > > -- > Best Regards, Donald McLaren > ===================== > D.G. McLaren > University of Wisconsin - Madison > Neuroscience Training Program > Office: (608) 265-9672 > Lab: (608) 256-1901 ext 12914 > ===================== > This e-mail contains CONFIDENTIAL INFORMATION which may contain PROTECTED > HEALTHCARE INFORMATION and may also be LEGALLY PRIVILEGED and which is > intended only for the use of the individual or entity named above. If the > reader of the e-mail is not the intended recipient or the employee or agent > responsible for delivering it to the intended recipient, you are hereby > notified that you are in possession of confidential and privileged > information. Any unauthorized use, disclosure, copying or the taking of any > action in reliance on the contents of this information is strictly > prohibited and may be unlawful. If you have received this e-mail > unintentionally, please immediately notify the sender via telephone at (608) > 265-9672 or email.