cluster

cluster,

n in epidemiology, a composite of confirmed cases of a disease, defect, or disability that occur in close proximity to one another with regard to time or space.

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cluster

1. in epidemiological terms a naturally occurring group of similar units, e.g. animals which resemble each other, with respect to one or more variables, more than animals in different groups do, or a group of cases of a single disease in time or space.

2. assembly of claw and teat cups, as part of a milking machine.

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cluster analysis

1. statistical methods used to group variables or observations into strongly interrelated subgroups.

2. a statistical analysis of the relationships between clusters in time and/or space.

cluster fly

see polleniarudis.

cluster sampling

see cluster sampling.