A two stage stratified sample by regions (marzes) has been designed to conduct the survey. The method of systematic probability sampling was used to frame the sample. Yerevan and all marzes with rural and urban settlements were covered by sample population with proportion of all HH available in these strata.
Based on the administrative and territorial division of RA at the first stage of sampling, the preliminary sampling units, i.e. enumeration areas were selected. 2001 Armenian Population Census results were used to calculate the mentioned proportions for 2014 LFS and 2011 Census results for 2015 LFS.
At the second stage of sampling the primary sampling units, that are HHs to be surveyed, were randomly selected. As a result, during the 2014 year have been surveyed 7680 HHs, of which 5 160 urban and 2520 rural areas. During the 2015 have been surveyed 7788 HHs, of which 4 752 urban and 3 036 rural areas.
At the same time a reserve sample was selected by the same steps, because it was anticipated that in most cases the questionnaire may not be completed due to household's refusal to participate in the survey, absence from the republic or other reasons. As a result, the HHs not participated in the survey were replaced from the reserve sample. The selection of households (HH) has been done monthly by the rotation principle.
