probemod (version 0.1)

pickapoint: Pick-A-Point Technique

Description

Probe moderation effect using the Pick-A-Point technique

Usage

pickapoint(model, dv, iv, mod, points, method = "meansd", alpha = 0.05)

Arguments

model

regression model (lm).

dv

dependent variable (character).

iv

independent variable (character).

mod

moderator variable(s) (character or character vector).

points

list of points to test for each moderators (list).

method

method to use. Possible values are: "meansd", "percentiles", centered="meansd" by default.

alpha

alpha level to use (numeric).

Value

• A list with the elements

References

Spiller, S. A., Fitzsimons, G. J., Lynch, J. G., Jr, & McClelland, G. H. (2013). Spotlights, floodlights, and the magic number zero: Simple effects tests in moderated regression. Journal of Marketing Research, 50(2), 277-288.

Aiken, L. S., & West, S. G. (1991). Multiple regression: Testing and interpreting interactions. Thousand Oaks, CA: Sage Publications.

Examples

myModel <- lm('dv ~ iv + mod', data=someData)
pickapoint(myModel, dv='DV', iv='IV', mod='MOD')
pickapoint(myModel, dv='DV', iv='IV', mod='MOD', alpha=.01)
pickapoint(myModel, dv='DV', iv='IV', mod='MOD', method='percentiles')
pickapoint(myModel, dv='DV', iv='IV', mod='MOD', points=c(1,2,3))