Autocorrelation

Autocorrelation - Autocorrelation means that the observations are not independent. Each observation will tend to be close in value to the next. This can result in under estimating sigma. A little bit of autocorrelation will not ruin a control chart.

[Category=Data Quality ]

Source: iSixSigma, 31 December 2010 09:39:00, https:web.archive.org/web/20111109014246/http:www.isixsigma.com/index.php?option=com_glossary

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autocorrelation - [statistics] The correlation or similarity of values, generally values that are nearby in a dataset. Temporal data is said to exhibit serial autocorrelation when values measured close together in time are more similar than values measured far apart in time. Spatial data is said to exhibit spatial autocorrelation when values measured nearby in space are more similar than values measured farther away from each other.

[Category=Geospatial ]

Source: esri, 24 January 2012 16:37:07, http://support.esri.com/en/knowledgebase/GISDictionary/term/abbreviation