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Reference period for core variables: constant, at selection, income reference period, usual week, last 4 weeks, last 12 months, since last year, working life, childcare reference period (Eurostat (2013): DESCRIPTION OF TARGET VARIABLES: Cross-sectional and Longitudinal. 2012 operation (Version May 2013), p. 74).The 2012 module variables relate to four types of reference periods: Usual: an ordinary winter/summer, in the area where the dwelling is located (for the variables “dwelling comfortably warm during winter time” and “dwelling comfortably cool during summer time”). Last five years (for the variables related to the “change of the dwelling”). It refers to the five years prior to the date of the interview. Next six months (for the variables related to “risk of changing the dwelling”). It refers to the six months succeeding to the date of the interview. Current (for all other variables). (Eurostat (2013): 2012 EU-SILC MODULE ON HOUSING CONDITIONS. Assessment of the implementation, pp. 3-4.)
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