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{{Definition|'''Temporal data''' refers to data, where changes over time or temporal aspects play a central role or are of interest.}}
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{{Definition|'''Temporal data''' refers to data, where changes over time or temporal aspects play a central role or are of interest.}}




Line 8: Line 8:


{{Quotation|Time dependent data is characterized by data elements being a function of time. In general, data takes the form
{{Quotation|Time dependent data is characterized by data elements being a function of time. In general, data takes the form
:''d = f(t)''
:''d
''For data defined at discrete time stamps t<sub>i</sub>, this relation can be represented as:''
:''D &#61; {(t<sub>1</sub>, d<sub>1</sub>),( t<sub>2</sub>, d<sub>2</sub>), ..., (t<sub>n</sub>, d<sub>n</sub>)}''
:''where''
:''d<sub>i</sub> &#61; f(t<sub>i</sub>)''|[M&uuml;ller and Schumann, 2003]}}
 
Time-series are a part of the broader field of time-oriented data:
{{Quotation|Time series data is characterized by data elements being a function of time. In general, this data takes the following form:
:''D &#61; {(t<sub>1</sub>, y<sub>1</sub>),( t<sub>2</sub>, y<sub>2</sub>), ..., (t<sub>n</sub>, y<sub>n</sub>)}''
:''with''
:''y<sub>i</sub> &#61; f(t<sub>i</sub>)''|[Weber et al., 2001]}}
 
== Synonyms ==
*temporal data
*time-oriented data
*time-varying data
*time-dependent data
 
== References ==
*[Daassi et al., 2004] Chaouki Daassi, Laurence Nigay, and Marie-Christine Fauvet. Visualization Process of Temporal Data, ''Lecture Notes in Computer Science'', 3180, Springer-Verlag Heidelberg, 2004.
*[Jensen and Snodgrass, 1999] Christian S. Jensen and Richard T. Snodgrass. Temporal Data Management, ''IEEE Transactions on Knowledge and Data Engineering'', 11:36-44, 1999.
*[M&uuml;ller and Schumann, 2003] W. M&uuml;ller and H. S. Schumann. Visualization Methods for Time-dependent Data - an Overview, In ''Proceedings of Winter Simulation 2003'', New Orleans, USA, 2003
*[Weber et al., 2001] Marc Weber, Marc Alexa, and Wolfgang M&uuml;ller. Visualizing Time-Series on Spirals, In ''Proceedings of the IEEE Symposium on Information Visualization 2001 (InfoVis 2001)'', p. 7-14, October 2001.
 
 
[[Category: Glossary]]

Revision as of 09:45, 15 July 2007

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Temporal data refers to data, where changes over time or temporal aspects play a central role or are of interest.


Definitions

Temporal data is data that varies over time.
[Jensen and Snodgrass, 1999]


A temporal data denotes the evolution of an object characteristic over a period of time.
[Daassi and Nigay, 2004]


{{Quotation|Time dependent data is characterized by data elements being a function of time. In general, data takes the form

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