A statistical population is a set of similar items of interest for a question or experiment . Here we further define a population as an ensemble of online payments that share a common characteristic.
- An example: The observatory for payment card security (OSCP);
- An e-commerce service's set of transactions; and
- Dynamic vs. Fixed populations.
An example: The observatory for payment card security (OSCP)
In the case of the Observatory for Payment Card Security (OSCP) published by the Banque de France, the common characteristic is the country; the report describes payment fraud in the set of online payments acquired by French acquiring services or processed by French issuers.
An e-commerce service's set of transactions
Another population is the set of online payments made on an e-commerce service. In that case, fraud is considered within the sales of that merchant. For example, a subpopulation would be all the sales made via a PayPal payment.
Dynamic vs. Fixed populations
Previous examples are instances of dynamic populations, where actual
cardholders making purchases change over time. Alternatively, fixed
populations are also possible; notably, this could be the case if an e-commerce service distributes coupons to a deter- mined set of VIP clients.
- A.N. Glaser. High-yield Biostatistics. High-yield series. Lippin- cott Williams & Wilkins, 2001.
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