7.1.133. 3dRegAna

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++ 3dRegAna: AFNI version=AFNI_2011_12_21_1014 (Dec 16 2015) [64-bit] ++ Authored by: B. Douglas Ward This program performs multiple linear regression analysis.

Usage: 3dRegAna

-rows n number of input datasets

-cols m number of X variables

-xydata X11 X12 ... X1m filename X variables and Y observations
. . . . . .

-xydata Xn1 Xn2 ... Xnm filename X variables and Y observations

-model\ i1 ... iq : j1 ... jr definition of linear regression model;
reduced model:
Y = f(Xj1,...,Xjr)
full model:
Y = f(Xj1,...,Xjr,Xi1,...,Xiq)

[-diskspace] print out disk space required for program execution

[-workmem mega] number of megabytes of RAM to use for statistical
workspace (default = 750 (was 12))

[-rmsmin r] r = minimum rms error to reject constant model

[-fdisp fval] display (to screen) results for those voxels
whose F-statistic is > fval

[-flof alpha] alpha = minimum p value for F due to lack of fit

The following commands generate individual AFNI 2 sub**-brick** datasets:

[-fcoef k prefixname] estimate of kth regression coefficient
along with F-test for the regression is written to AFNI `fift’ dataset
[-rcoef k prefixname] estimate of kth regression coefficient
along with coef. of mult. deter. R^2 is written to AFNI `fith’ dataset
[-tcoef k prefixname] estimate of kth regression coefficient
along with t-test for the coefficient is written to AFNI `fitt’ dataset

The following commands generate one AFNI ‘bucket’ type dataset:

[-bucket n prefixname] create one AFNI ‘bucket’ dataset having
n sub-bricks; n=0 creates default output; output ‘bucket’ is written to prefixname

The mth sub-brick will contain: [-brick m coef k label] kth parameter regression coefficient [-brick m fstat label] F-stat for significance of regression [-brick m rstat label] coefficient of multiple determination R^2 [-brick m tstat k label] t-stat for kth regression coefficient

[-datum DATUM] write the output in DATUM format.
Choose from short (default) or float.
N.B.: For this program, the user must specify 1 and only 1 sub-brick
with each -xydata command. That is, if an input dataset contains more than 1 sub-brick, a sub-brick selector must be used, e.g.: -xydata 2.17 4.59 7.18 ‘fred+orig[3]’

INPUT DATASET NAMES

This program accepts datasets that are modified on input according to the following schemes:

‘r1+orig[3..5]’ {sub-brick selector} ‘r1+orig<100..200>’ {sub-range selector} ‘r1+orig[3..5]<100..200>’ {both selectors} ‘3dcalc( -a r1+orig -b r2+orig -expr 0.5*(a+b) )’ {calculation}

For the gruesome details, see the output of ‘afni -help’.

++ Compile date = Dec 16 2015

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