Hi Anderson, Thank you so much for your explanation. I think I'm just struggling with using Text2Vest to generate the number of waves/points that I need. Specifically, I am trying to correlate Fa values to a single behavioral measure so need my design matrix to be 100X1, and my contrast matrix to simply to represent the single EV. However, I cannot find a format in which Text2Vest will probably create the contrast file for me. Just a 1 for a single contrast will give me a division by 0 error and a 1 0 gives me a 1X2 matrix which is not what I need. Thank you so much, Levi On Sat, Oct 17, 2015 at 4:38 AM, Anderson M. Winkler <[log in to unmask] > wrote: > Hi, > > Maybe that example was too tiny to be useful. The file contains a matrix. > Each row of this matrix is a t-contrast. > > The /NumWaves is the number of columns in this matrix (which corresponds > to the number of EVs in the design matrix), and /NumPoints is the number of > rows (which corresponds to the number of t-contrasts). > > If you want a single contrast as [1 -1], that is, comparing the regression > coefficients for EV1 with EV2, the contrast file would be: > > /NumWaves 2 > /NumPoints 1 > > /Matrix > 1 -1 > > All the best, > > Anderson > > > On 16 October 2015 at 17:28, LEVI SOLOMYAK <[log in to unmask]> > wrote: > >> Hi Anderson, >> >> Thank you so much for your suggestion. When I try and create the contrast >> file from that matrix (1, -1), it interprets it as NumWaves 2 and NumPoints >> 1. Is there some simple way so that it defines the contrast the other way? >> >> Thank you so much, >> CN >> >> On Fri, Sep 25, 2015 at 2:15 AM, Anderson M. Winkler < >> [log in to unmask]> wrote: >> >>> Hi Corey, >>> >>> Can't say without seeing what you are doing, but in any case, with a >>> single EV, you can create the design.mat by hand. It's a text file that >>> looks like this: >>> >>> /NumWaves 1 >>> /NumPoints 100 >>> >>> /Matrix >>> xx >>> xx >>> xx >>> xx >>> xx >>> ... >>> >>> Where the "xx" are the numerical values you have for the EV. The >>> design.con follows a similar structure: >>> >>> /NumWaves 1 >>> /NumPoints 2 >>> >>> /Matrix >>> 1 >>> -1 >>> >>> When running randomise, include the option -D. >>> >>> All the best, >>> >>> Anderson >>> >>> >>> >>> On 24 September 2015 at 16:38, Corey N <[log in to unmask]> >>> wrote: >>> >>>> Dear FSl Experts, >>>> >>>> I am hoping to run a one sample t-test using GLM to find correlations >>>> between FA values and a behavioral measure. Since all of my subjects are in >>>> a single group, my design matrix is simply the behavioral value. Is that >>>> correct? >>>> >>>> Because I am working with 100 subjects, I used Text2Vest to convert my >>>> contrast matrix. I tried to do the same for the design matrix (1) since >>>> theres only 1 ev but get a expr: division by zero. >>>> >>>> Am I setting up my GLM correctly? And if so, what is my mistake with >>>> Text2Vest? >>>> >>>> Thank you so much >>>> CN >>>> >>> >>> >> >