quadratic_term: Quadratic term function

In seminr: Building and Estimating Structural Equation Models

Quadratic term function

Description

quadratic_term is a convenience wrapper around interaction_term for creating a quadratic effect of a single construct (i.e., X squared). It is equivalent to calling interaction_term(iv = construct, moderator = construct, ...).

Usage

quadratic_term(iv, method, weights)

Arguments

iv	The construct to square.
method	The method to generate the quadratic term with a default of two_stage.
weights	The weighting mode for quadratic items in a PLS model (only) with default of mode_A.

Details

The resulting construct in the structural model is named "X*X" where X is the construct name. Reference it accordingly in paths().

Value

An un-evaluated function (promise) for generating a quadratic term, identical to what interaction_term(iv, iv, method, weights) returns.

Examples

data(mobi)

mobi_mm <- constructs(
  composite("Image",        multi_items("IMAG", 1:5)),
  composite("Satisfaction", multi_items("CUSA", 1:3)),
  quadratic_term(iv = "Image", method = two_stage)
)

mobi_sm <- relationships(
  paths(to = "Satisfaction",
        from = c("Image", "Image*Image"))
)

mobi_pls <- estimate_pls(mobi, mobi_mm, mobi_sm)
summary(mobi_pls)

seminr documentation built on May 25, 2026, 9:06 a.m.