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Hi,
I have repeated measures data (patients’ reports of symptoms at each therapy session), and I’m trying to model the within-person effect of the IV (amount of a specific therapeutic technique during each session) on next-session symptom change. I’m new to Mplus, so I’m not sure how to account for the lagged auto-regressive effect of the DV (symptoms at one session affecting symptoms at the next session). I only have data for the IV for 3 sessions.
I’ve been looking at Example 9.2 (two-level regression analysis) of the user guide as a template, but I’m not sure if I am adapting it correctly. I would like to run a main effect model, as well as moderation with a between-person variable.
Here is the code I've tried (_p indicates prior session):
USEVARIABLES ARE Patno Session S_bet_p S_win_p BDI_p BDI;
missing = .;
WITHIN = S_win_p;
BETWEEN = S_bet_p;
CLUSTER = patno;
DEFINE: CENTER S_win_p (GROUPMEAN);
ANALYSIS: TYPE = TWOLEVEL RANDOM;
MODEL:
%WITHIN%
s | BDI ON S_win_p;
%BETWEEN%
BDI s ON S_bet_p;
BDI WITH s;
Any help would be greatly appreciated. Thanks! |
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| What's your number of time points for the symptom outcome? |
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| Thank you for your quick response! I have 5 time points for the outcome (sessions 1-5),and IV data for sessions 2-4. |
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Also, this is the code I have tried with a moderator (TRS):
Within = S_win_p ;
Between = TRS ;
Cluster = patno ;
DEFINE: Center x (groupmean);
ANALYSIS: TYPE = TWOLEVEL RANDOM ;
MODEL: %WITHIN%
s | BDI ON S_win_p;
BDI ON BDI_p ;
%BETWEEN%
BDI ON TRS;
s ON TRS;
BDI WITH s;
Thanks again! |
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| Looks fine but X is not in the model. |
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