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Ancillary statistic: An ancillary statistic is a measure of a sample whose distribution does not depend on the parameters of the model. An ancillary statistic is a pivotal quantity that is also a statistic.
Ancillary data: Ancillary data is data that has been added to given data and uses the same form of transport. Common examples are cover art images for media files or streams, or digital data added to radio or television broadcasts.
Ancillary weapon: An ancillary weapon is a weapon used for secondary or auxiliary purpose, such as a bayonet, combat knife or an officer's sidearm. Through until the early 20th century, an officer's side arm was typically a sword, with the inclusion of a revolver or pistol between the mid 19th century to World War I and since World War II, a semi-automatic handgun.
Ancillary revenue: Ancillary revenue is revenue that is derived from goods or services other than a company's primary product offering. Examples include concessions at sporting events, baggage handling or seat selection revenue received by airlines, restaurant revenue received by hotel owners, and car-wash services sold by gas stations.