• Data reference period (Month)
• Geographic localization (Portugal)
• Type (hotel establishment)

• REFERENCE PERIOD:  The length of time for which data are collected, e.g. a specific day, month or year.
• LOCAL UNIT:  An enterprise or part thereof (e.g. a workshop, factory, warehouse, office, mine or depot) situated in a geographically identified place. At or from this place economic activity is carried out for which ' save for certain exceptions ' one or more persons work (even if only part-time) for one and the same enterprise.
• HOTEL ESTABLISHMENT:  Tourist development (establishment) with the purpose of providing, on a fee basis, lodging and other accessory or support services, with or without the provision of meals. Hotel establishments can be classified as: hotels, boarding houses, lodging houses, inns, motels and apartment-hotels. For statistical purposes, also included here are tourist villages and tourist apartments.
• NET OCCUPANCY RATE OF BED PLACES:  Relation between the number of overnight stays and the number of availabe bed-places in the reference period, considering double beds as two.

NOR(bed places) = [No. of overnight stays during reference period/ No. of available beds in reference period (considering double beds count as two)]*100