I used two methods (A and B) to obtain measurements in a group of subjects. The methods (ways of measuring) are different, but they should measure the same property.
I performed linear regressions to analyze the relation between the measurements (m_A and m_B) and another property (p)...
I have longitudinal data with measurements at two timepoints. I am interested in the change per year and calculated this in two ways:
* Dividing the difference between the measurements by the time difference and averaging over all cases.
* Performing a linear regression with subject...