Dear all,
I have recently analysed my data from a longitudinal study using multilevel modelling in MLwiN. I have observations from 3 time points (Level 1) which I have nested within the participants (Level 2). I am interested in the effects of several variables across time on a measure of psychological fatigue. I have therefore used the centring technique ‘Group Mean Centring’ based on information I read in the Nezlek (2001) and Enders and Tofighi (2007) articles. However, I have been informed that my justification for using this technique is not appropriate and was recommended an alternative article (Ludtke et al., 2009). I am confused because the arguments for using specific centring techniques appeared to be similar in all articles so I am unsure how to proceed with amending my methods section.
I was wondering if anyone could recommend any sources of information which may clarify this issue? Alternatively, does anyone know of any articles which present a clear methods section on how they have conducted their analyses and provided a clear justification of why a particular centring technique has been used?
Many thanks in advance for your time and help!
Kind Regards,
Iain