Hi,

I wanted to analyse my longitudinal data (2 time points) with a simple change score in a regression, however, I came up with 3 different models and I am not sure which one to use or why.

I am examining whether EFs are predictive of mathematics. I have several predictors and mathematics is my DV. I collected all the data in time 1 and again the same data set one year later, time 2. These are the 3 options I can see:

1. Take the difference from all variables (DV and IV) and run a regression, examining whether change in my IV, predict change in my DV

2. Take the difference from the DV (mathematics) and run a regression, examining whether the scores from my IV tested at time 1 predict the change in my DV

3. take the difference from the DV (mathematics) and a run a regression, examining whether the scores from my IV tested at time 1 and time 2 taken together, predict the change in my DV.

Could anyone help me in picking the right option and explain why?

Thank you in advance

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