Hi,

I am analysing the group comparison between healthy control(HC) and AD groups, using "age" as 2nd-level covariates. I defined HC, AD and Age as 2nd-level covariates in the SETUP of conn.

My questions are :
when I input the data of age as 2nd-level covariates, the data of, e.g., [80.4 76.3 89.6 71.1 70.2 73.9] turns to be [8e+01 8e+01 9e+01 7e+01 7e+01 7e+01], is it only a display problem or it will be actually calculated as [80 80 90 70 70 70]?

In addition, if I want to make a two-sample t-test between the two groups considering with age, am I right to define the contrast like: [1 -1 0] for HC, AD and Age? And if i want to make one-sample t-tests for each of the two group considering with age, how to define the contrast? I don't think [1 0] for HC/AD and Age is a right definition.

Any suggestions are greatly appreciated!

Best regards,
Yifei