Delfino Vargas Chanes is a full professor at the National Autonomous University of Mexico. He earned his Ph.D. in sociology, MS in statistics and MS in sociology from Iowa State University, and his BS in mathematics from the National Autonomous University of Mexico. He has published more than 50 articles and two books. His areas of interest are the study of poverty, inequality, and advanced methods in statistics applied to social sciences, such as structural equation models, multilevel modelling, and machine learning. He belongs to the Mexican National System of Researchers. Lukasz Czarnecki is a professor at the University of the National Education Commission, Krakow, Poland, and at Instituto Campechano, Mexico. He holds two PhDs in sociology - one from the National Autonomous University of Mexico and another from the University of Strasbourg, France - and a Juris Doctoris title from the Jagiellonian University of Krakow. His areas of interest include the intersections between sociology and subjective well-being with an application of structural equation modelling in the research on inequalities and other quantitative methods, including longitudinal analysis, oriented to apply mixed methods research. He is a member of the Mexican National System of Researchers.