IREF769440false2026-04-30T19:22:29ZCode list for concept "Frequency"This code list provides a set of values indicating the "frequency" of the data (e.g. weekly, monthly, quarterly). The concept "frequency" may refer to various stages in the production process, e.g. data collection or data dissemination. For example, a time series could be disseminated at annual frequency but the underlying data are compiled monthly. The code list is applicable for all different uses of "frequency".AnnualTo be used for data collected or disseminated every yearBiennialTo be used for data collected or disseminated every two yearsTriennialTo be used for data collected or disseminated every three yearsQuadrennialTo be used for data collected or disseminated every four yearsQuinquennialTo be used for data collected or disseminated every five yearsDecennialTo be used for data collected or disseminated every ten yearsBidecennialTo be used for data collected or disseminated every twenty yearsTridecennialTo be used for data collected or disseminated every thirty yearsThree times a yearTo be used for data collected or disseminated three times a yearHalf-yearly, semesterTo be used for data collected or disseminated every semesterQuarterlyTo be used for data collected or disseminated every quarterMonthlyTo be used for data collected or disseminated every monthBimonthlyTo be used for data collected or disseminated every two monthsSemimonthlyTo be used for data collected or disseminated twice a monthThree times a monthTo be used for data collected or disseminated three times a monthWeeklyTo be used for data collected or disseminated every weekBiweeklyTo be used for data collected or disseminated every two weeksTriweeklyTo be used for data collected or disseminated every three weeksFour-weeklyTo be used for data collected or disseminated every four weeksSemiweeklyTo be used for data collected or disseminated twice a weekThree times a weekTo be used for data collected or disseminated three times a weekDailyTo be used for data collected or disseminated every dayTwice a dayTo be used for data collected or disseminated twice a dayHourlyTo be used for data collected or disseminated every hourBihourlyTo be used for data collected or disseminated every two hoursTrihourlyTo be used for data collected or disseminated every three hoursDaily – business weekSimilar to "daily", however there are no observations for Saturdays and Sundays (so, neither “missing values” nor “numeric values” should be provided for Saturday and Sunday)MinutelyWhile N denotes "minutely", usually, there may be no observations every minute (for several series the frequency is usually "irregular" within a day/days). And though observations may be sparse (not collected or disseminated every minute), missing values do not need to be given for the minutes when no observations exist: in any case the time stamp determines when an observation is observedIrregularTo be used with irregular time series that stores data for a sequence of arbitrary timepoints. Irregular time series are appropriate when the data arrives unpredictably, such as when the application records every stock trade or when random events are recorded (the interval between each element can be a different length)Occasional annualThe event occurs occasionally with an infrequent update that could span from 1 year to several years between events. It implies a survey that experiences a gap for several years prior to the next survey update (this is commonly linked to funding available to run a specific survey (i.e. health surveys), whereas a regular annual survey refers typically to ‘programs’ that are funded regularly and fall under the Statistics Act, and therefore never experience a gap)Occasional monthlyThe event occurs occasionally with an infrequent update that could span from 1 month to several months between events. It implies a survey that experiences a gap for several months prior to the next survey updateOtherTo be used when the qualitative or quantitative values that a variable takes in a data set is associated to multiple occurrences with frequency other than the already defined ones (for example every 5 hours and 32 minutes etc.)UnspecifiedTo be used when a set of values are reported within a time range but not associated to sub ranges. Often this could happen in case of missing or sparse information. (Let’s say we have two observations for 2020 but we do not know if they are part of a monthly reporting or quarterly reporting)Not applicableTo be used when the qualitative or quantitative values that a variable takes in a data set is not associated to multiple occurrences (only single occurrence exists) one can use the _Z as frequency