Interlocking quotas were set on business activity and size within region by Beaufort Research based on universe counts supplied by Experian, from their National Business Database.
Pennwyd cwotâu cysylltiedig gan Beaufort Research ar weithgarwch busnes a maint o fewn rhanbarth yn seiliedig ar gyfrifiadau cyfanfyd a ddarparwyd gan Experian, o'u Cronfa Ddata Busnes Genedlaethol.