Pérez, Adriana, Saijuan Zhang, Victor Kipniss, Laurence S. Freedman, and Raymond J. Carroll. 2012. “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 (3):1-17. https://doi.org/10.18637/jss.v046.c03.