Dear R and statistics experts:
I have data of a behavioral experiment with the aim to
investigate the effect of a memory task on motor
learning.
Question:
I would appreciate help in figuring out a
possible formula to determine whether motor learning across
sessions differs between 2 groups.
Design:
- 2 Groups: group A: n=10 subjects, group B: n=10
- 6 motor learning sessions: baseline; immediately after
memory task; 6h, 24h, 30d later, and 30d later
with a different motor task
- dependent variable: response time (RT)
I tried the following:
(lme4 package of R, I assumed that
Subject is the random factor, and Session and Group the fixed factors.)
fm1 <- lmer(RT ~ Session + Group + (1|Subject) + (1|Subject:Session), table)
I would appreciate any help on the formula or the
choice of statistical approach.