information from the General Population and Housing Census 2000. ENOE collects information from approximately 120,000 dwellings every quarter and is based on a probabilistic, two-staged, stratified cluster sampling design. The sampling frame is stratified by socioeconomic status and is designed to reflect national, state, city, and community-size levels.13 Households within dwellings are interviewed five times within a period of 15 months. Each quarter, 20 percent of the dwellings leave the sample after completing the fifth round and are replaced by new entries, which are randomly selected with unequal probabilities of selection from the stratified sampling frame. Expansion factors include a sampling weight, a weight to reflect differential non-response rates, and calibration weights to the official projections of the population for a given year.
ENOE asks those not currently working whether they have tried to look for a job in another country or whether they are preparing to cross the border. ENOE also has information on whether individuals receive remittances, though without specifying the amount and regularity. Other migration information is captured in the household roster, which asks about the residential status of all individuals living in the dwelling at the time of the prior round of interviews. If a person is no longer living in the household, the respondent is asked about the reasons why he/she moved out (work, study, health problems, family reasons, among others) and his/her current place of residence (the same state, another state, or outside of the country14). This information can be complemented with the basic social-demographic variables obtained in the prior interview. The household roster also captures information on new arrivals. Aside from the social-demographic profile of the new members of the household, it asks the reasons for moving in (similar to the responses for those moving out) and which state or country the respondent was leaving before arriving to the household. In the 2010 ENOE, an average of 239 households per round reported out-migrants and 185 households reported returned migrants moving in from outside of Mexico. An average of 367 households per round had either a new arrival or somebody leaving for another country. (As noted above, each round includes more than 120,000 dwellings.) Researchers state that ENOE can capture short-term changes15 in Mexico–U.S. migration trends, and it has been used to estimate out-migration and in-migration flows from 2006 to the present (Bustos, 2011; Zenteno, 2011).
13 The four size categories for communities are less than 2,500 inhabitants, 2,500 to 14,999 inhabitants, 15,000 to 99,999 inhabitants, and 100,000 or more inhabitants.
14 ENOE does not specify the country of origin or destination of international migrants. Nevertheless, the vast majority of all international movements—above 95 percent—are known to occur between Mexico and the United States (Galindo and Ramos, 2009:114).
15 That is, quarterly migration or any movement between the first and last round (15 months).