1993, General project identification mission. Brief[1], San Jose, Costa Rica: Fondo Internacional de Desarrollo Agrícola, page 50:
A bietapic process should be used to select beneficiaries: 1) choosing depressed regions [...]; and 2) using similar indicators to choose groups that are not earning enough to buy basic goods and services
2010, G. García Martín, “Marketing is changing. An Econometric Model on Marketing and New Technologies”, in ESIC Market Economic and Business Journal[2]:
So, we must use a bietapic estimation method, like the estimator proposed by Heckman (1979) whose detailed explanation we can find in Amemiya (1988), where the solution is to make an estimation in two stages
2015, P. Gabaldon, C. De Anca, C. Galdón, “Measures of success for self-employed mothers in Spain”, in International Journal of Entrepreneurial Behavior & Research, →DOI:
It is a bietapic (two-stage) sampling that represents the Spanish resident population in households during all days of the year and provides information on the time use of all members of the household older than ten years
2017, A. Monleón-Getino, C. I. Rodríguez-Casado, J. Méndez-Viera, “How to calculate the number of samples in the design of pre/pro-biotics studies (metagenomic studies)”, in III Workshop of INSA-UB (conference proceedings)[3], →DOI, page 65:
One possibility is the use of a bietapic method: conduct a pilot study, prior to the final study
2021, A. Hernández-Vásquez, R. Vargas-Fernández, D. Azañedo, “Factors associated with the consumption of table salt with inadequate iodine concentrations: a population analysis at a Peruvian household level”, in Public Health Nutrition, →DOI:
The sampling type is bietapic, probabilistic of balanced type, stratified and independent, and is performed in two stages.
