[R] multiple moderated regression steps
stam_kiral at hotmail.com
Fri Jul 1 11:24:19 CEST 2011
ım studying moderated effects of percieved social support and justice world
belief on relationship between stress coping strategies and depression
level. ı haver never run this analysis before soi ı want to check my steps
whether correct or not.
first ı run regression
in step 1
centered independent variables and centered moderators
two way interactions
three way interactions
as results ı found significiant two way and three way interactions. "It ıs
important after this"
for example two way interactions;
ı run 2 slopes that fit in with Winnifred's suggestion
my criteria for significence was the centered indipendent vairable (that has
significant interaction level) in Block 2--------- is this way is
second to plot this slope ı used Dawson' s 2 way unstandardised excel
spreadsheet (http://www.jeremydawson.co.uk/slopes.htm). In spreadsheet it is
required to enter unstandardised regression coefficients of IV, moderator
and interaction. ın which block the coefficients are true for entering IV
and moderator co efficients?????
ın 1 block (that include main effects) or in 2 block (that include
one more question: In three way spreadshhet it is necessary to enter
variance of IV*Moderator coefficient. ın matrıx which covariance block is
correct to enter this value? should ı look at second covariance block or
third covariance block.
like this,for value of Covariance of IV*Mod1, IV*Mod2 coefficients which
covariance block must be taken as correct???
thaks so much
Note: excuse me for my English
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