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# Mosaic is a social classification. More
information is available here.
* Meaning of an 'index' : An 'index' shows
whether the level of something is higher in one area than it
is in another area. In this instance we are interested in
whether the number of occurrences of a name per million
population is higher in a particular area than it is
elsewhere. Thus we compare the incidence of a name in the US
state where it is most concentrated with the average level
of concentration in the whole of the US; the incidence in
Australia's top state with the Australian average; the
incidence in New Zealand's top province with the New Zealand
average; the incidence in GB's top postal area with the GB
average.
* Calculation of an 'index' : If a name has a rate per
million population in an area which is identical to its rate
in a base comparison area then we say it has an index of
'100'. An index of '200' for a the name Jenson in Ohio would
mean that the name Jenson was twice as common, per million
population, in Ohio as it was in the reference area, in this
case the whole US. An index of '500' for Wong in Victoria
would indicate that the name Wong was five times more common
per 1,000,000 names in Victoria than in the whole of
Australia. An index of '1000' for the name Penhaligon in New
Zealand would mean it was ten times more common per
1,000.000 names in New Zealand than in Great Britain. By
contrast an index of only '50' would indicate a name which
was only half as common in a target area than in its
reference area.
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