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An example of cluster sampling is area sampling or geographical cluster sampling.Each cluster is a geographical area in an area sampling frame.Because a geographically dispersed population can be expensive to survey, greater economy than simple random sampling can be achieved by grouping several respondents within a local area into a cluster.
Hard clustering: each object belongs to a cluster or not; Soft clustering (also: fuzzy clustering): each object belongs to each cluster to a certain degree (for example, a likelihood of belonging to the cluster) There are also finer distinctions possible, for example: Strict partitioning clustering: each object belongs to exactly one cluster
The open cluster Messier 6 in the constellation Scorpius is also known as the Butterfly Cluster or NGC 6405. This is a list of open clusters located in the Milky Way.An open cluster is an association of up to a few thousand stars that all formed from the same giant molecular cloud.
The best known example in the Milky Way is the Double Cluster of NGC 869 and NGC 884 (also known as h and χ Persei), but at least 10 more double clusters are known to exist. [34] New research indicates the Cepheid -hosting M25 may constitute a ternary star cluster together with NGC 6716 and Collinder 394. [ 35 ]
Some examples of game console clusters are Sony PlayStation clusters and Microsoft Xbox clusters. Another example of consumer game product is the Nvidia Tesla Personal Supercomputer workstation, which uses multiple graphics accelerator processor chips. Besides game consoles, high-end graphics cards too can be used instead.
An exceptional example of a prominent high-tech cluster that does not include a university is the High Tech Campus Eindhoven, located in the Dutch city of Eindhoven. [ 15 ] [ 16 ] Historic know-how-based clusters – These are based on more traditional economic activities that maintain their advantage in know-how over the years, and for some of ...
Human Rights Watch said it has also identified examples of cluster munition use. On Friday, it said a cluster bomb had been used the day before by the Russian military in the town of Vuhledar.
The average silhouette of the data is another useful criterion for assessing the natural number of clusters. The silhouette of a data instance is a measure of how closely it is matched to data within its cluster and how loosely it is matched to data of the neighboring cluster, i.e., the cluster whose average distance from the datum is lowest. [8]