[R] multiple moderated regression steps
stam_kiral at hotmail.com
Fri Jul 1 15:48:37 CEST 2011
variables were centered (except DV), because in social sciences zero is
rarely a meaningful point on a scale (Cohen, Cohen, West, Aiken, 2006). for
example in percieved social support questionnaire there is no value as zero.
It is a Likert Type questionnaire and on questionnaire 1= strongly
yes.....7= strongly no. So Aiken and West (1991), suggested to centered
predictors and moderators to appoint zero a meaningful value to count in
regression equation. also multilevel steps were run to avoid
multicollinearity. according to results .05 were accepted as significant (in
the coefficient table) and slope test were done for interactions.
for plottin slopes unstandardised regression coefficient were used.
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