The Peru National Household Survey, or Encuesta Nacional de Hogares (ENAHO), was first implemented in 1995. From 1997-2002 data was collected on a quarterly basis. The fourth quarter of the survey was executed under the Program for the Improvement of Surveys and the Measurement of Living Conditions in Latin America and the Caribbean (MECOVI), and detailed employment and household expenditure data were gathered to provide information on the living conditions and poverty status of the population. In addition to households, community leaders were also surveyed from 1997-2006. The surveys executed in the first, second, and third quarters of 1997-2002 often focused on specific subjects such as employment or crime and victimization. While the majority of the surveys in this program have been conducted nationally in urban and rural areas, a few of the earlier surveys were done in select provinces or only enumerated the national, urban population. In addition to employment, income, and expenditure data, main topics often covered by the surveys include agricultural activities, health status and health care use, housing, and demographics.
In May 2003 data collection for the survey became continuous, and the sample of the fourth quarter of the 2002 survey was divided into 12 subsamples, each for a month of the year. The modules for the continuous survey are similar to those used in the fourth quarter of previous years. The continuous data collection allows for different levels of inference. Monthly data allows for national inference, quarterly data allows for region level inference, and the annual data allows for department level inference.
The survey has included a panel component since 1998, and the panel size varies from year to year.