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interflex

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interflex estimates, visualizes, and interprets conditional marginal effects and performs diagnostics.

Authors: Jens Hainmueller, Jiehan Liu, Licheng Liu, Ziyi Liu, Jonathan Mummolo, Tianzhu Qin, and Yiqing Xu (maintainer)

Date: Feburary 12, 2025

Repos: Github (1.3.2) CRAN (1.2.6)

Tutoralis: See tutorials for cases with continuous and discrete outcomes, as well as a tutorial for double/debiased machine learning (DML) estimators.

Examples: R code used in the tutorials can be downloaded from here.

Reference: How Much Should We Trust Estimates from Multiplicative Interaction Models? Simple Tools to Improve Empirical Practice. Political Analysis, Vol. 27, Iss. 2, April 2019, pp. 163–192.

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Installation

You can install the interflex package from CRAN:

install.packages('interflex', type = "source", 
                 repos = 'http://cran.us.r-project.org') 

Or you can install the up-to-date development version from Github:

# if not already installed
install.packages('devtools', repos = 'http://cran.us.r-project.org') 
# install from github
devtools::install_github('xuyiqing/interflex')

interflex depends on the following packages, which will be installed automatically when interflex is being installed; if not, please install them manually:

# Function to install packages
install_all <- function(packages) {
  installed_pkgs <- installed.packages()[, "Package"]
  for (pkg in packages) {
    if (!pkg %in% installed_pkgs) {
      install.packages(pkg, repos = 'http://cran.us.r-project.org')
    }
  }
}

# Packages to be installed
packages <- c("Rcpp", "mgcv", "sandwich", "pcse", "fixest", "foreach", "doParallel", 
              "lfe", "lmtest", "Lmoments", "ggplot2", "plotrix", "grid", 
              "gridExtra", "ggplotify", "ggpubr", "RColorBrewer", "grDevices", 
              "gtable", "MASS", "mvtnorm", "pROC", "ModelMetrics", "foreign",
              "patchwork", "rmarkdown")

# Install the packages
install_all(packages)

Mac users who encounter “-lgfortran” or “-lquadmath” error during installation, please check out the solution here. Typing the following two lines of code in your Terminal should solve this problem.

curl -OL http://r.research.att.com/libs/gfortran-4.8.2-darwin13.tar.bz2
sudo tar fvxz gfortran-4.8.2-darwin13.tar.bz2 -C /

Mac users who encounter clang: error: unsupported option ‘-fopenmp’, please consider (1) updating your R and/or (2) installing new R macro tools from Github.

Report bugs

Please report bugs to yiqingxu [at] stanford.edu with your sample code and data file. Much appreciated!