[R] multiple moderated regression steps

stamkiral 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

in step2
two way interactions

instep 3
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
(http://www.docstoc.com/docs/21151269/Moderated-Multiple-Regression-v5 p.6) 
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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