[R-sig-ME] measuring carry-over effects in mixed models
Simon Harmel
@|m@h@rme| @end|ng |rom gm@||@com
Thu Feb 17 19:32:19 CET 2022
Hello All,
I'm analyzing the data from my longitudinal study whose design can be
depicted as (view the following in plain text):
O1 X1 O2 X2 O3 X3 O4
O1 O2 O3 O4
where Xs denote subtitled videos given to the treatment group and Os
denote measurement occasions.
My current model is: lmer(y ~ time*group + [covariates] + (1 | student))
However, I'm also interested in measuring the "carry-over effects" of
watching subtitled videos at each occasion to the subsequent
occasions.
For instance, I want to know how much watching the subtitled video at
the first occasion (O1) impacts the treated students' performance at
later occasions (O2 and O3) etc.
I wonder if any changes to my model can enable me to measure these
carry-over effects or if any other R package may provide such
functionality?
Many thanks,
Simon
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