Where Xd is the difference score, XT1 is the score on the variable at time 1, and XT2 is the score on the variable at time ...Where Xd is the difference score, XT1 is the score on the variable at time 1, and XT2 is the score on the variable at time 2. What all of these names have in common is that they describe the analysis of two scores that are related in a systematic way within people or within pairs, which is what each of the datasets usable in this analysis have in common.
Where Xd is the difference score, XT1 is the score on the variable at time 1, and XT2 is the score on the variable at time ...Where Xd is the difference score, XT1 is the score on the variable at time 1, and XT2 is the score on the variable at time 2. What all of these names have in common is that they describe the analysis of two scores that are related in a systematic way within people or within pairs, which is what each of the datasets usable in this analysis have in common.