simpleSlope

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Simple slopes analysis for Moderated regression

Simple slope analysis according to Cohen, Cohen, West, & Aiken (2003); Bauer & Curran, (2005); and Dawson and Richter (2006) approaches.

Keywords
~kwd1, ~kwd2
Usage
simpleSlope(object, pred, mod1, mod2, coded, ...)
## S3 method for class 'default':
simpleSlope(object, pred, mod1, mod2="none",coded = "none", ...)
Arguments
object
an object of class "lmres": a moderated regression function.
pred
name of the predictor variable
mod1
name of the first moderator variable
mod2
name of the second moderator variable. Default "none" is used in order to analyzing two way interaction,
coded
a character vector of coded variables
...
Details

Simple slope analysis for moderated regression. If two way interaction is analyzed, the function computes simple slope analysis and region of significance( Bauer & Curran, 2005). If three way interaction is analyzed, the function compute simple slope analysis and difference slope test (Dawson and Richter, 2006).

Value

  • simpleSlope returns an object of class "simpleSlope". An object of class "simpleSlope" is a list containing at least the following components:
  • nomYthe name of dependent variable
  • ordeit's 2 for two way interaction, it's 3 for three way interaction
  • pointsEstimated points of dependent variable as a function of levels of moderators and predictor
  • simple_slopea matrix summarizing simple slopes results
  • delta_slope(only for three way interaction)a matrix summarizing difference slope tests
  • Dfdegree of freedom
  • conf95(only for two way interaction)confidence interval of moderator region of significance

References

-Bauer, D. J., & Curran, P. J. (2005). Probing Interactions in Fixed and Multilevel Regression: Inferential and Graphical Techniques. Multivariate Behavioral Research, 40(3), 373-400. -Cohen, J., Cohen, P.,West, S. G.,& Aiken, L. S. (2003). Applied multiple regression/correlation analyses for the behavioral sciences (3rd ed.). Mahwah, NJ: Lawerence Erlbaum Associates, Inc. - Dawson, J. F., and Richter, W. (2006) Probing Three-Way interactions in moderated multiple regression: Development and application of a slope difference test. Journal of Applied Psychology, 4, 917-926.

See Also

summary.simpleSlope

Aliases
  • simpleSlope
  • simpleSlope.default
  • print.simpleSlope
Examples
## simple slope for three way interaction
	
	library(car)
	data(Highway1)
	model3<-lmres(rate~len*trks*sigs1, centered=c("len","trks","sigs1"),data=Highway1)
    S_slopes<-simpleSlope(model3,pred="len",mod1="trks", mod2="sigs1")


## The function is currently defined as
function (object, pred, mod1, mod2, coded, ...) 
UseMethod("simpleSlope")
Documentation reproduced from package pequod, version 0.0-2, License: GPL-2

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