Information on the level of wages of the main job is compulsory in the LFS since 2009 (year of reference). Asking for income in household surveys is a sensitive issue that can affect the response rates and the confidence of the respondents. It was decided to obtain information from administrative sources. The Spanish LFS does not ask the personal identification number of the respondents. The solution applied in the Spanish LFS was to incorporate the PIDN (personal identification number) from the register of population matching the information for both, personal and location variables and to use this PIDN to link through the Social Security and Tax databases and incorporate the data on salaries needed to calculate the variable requested in the LFS. A general view of all the processes involved, the difficulties that we had to overcome and the main findings obtained in the preparation of the information are described.
Palabras clave / Key words: Labour force survey, record linkage, microintegration, combination of administrative data, validation of data sources, best estimation methodIntegrating administrative data into the LFS data collection. The Spanish experience obtaining the variable INDECIL from administrative sources. (Pdf 125 KB)