Pérez, Adriana, Saijuan Zhang, Victor Kipniss, Laurence S. Freedman, and Raymond J. Carroll. “Intake_epis_food(): An R Function for Fitting a Bivariate Nonlinear Measurement Error Model to Estimate Usual and Energy Intake for Episodically Consumed Foods”. Journal of Statistical Software, Code Snippets 46, no. 3 (March 5, 2012): 1–17. Accessed August 9, 2022. https://www.jstatsoft.org/index.php/jss/article/view/v046c03.