Statistics theory: Difference between revisions
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'''Statistics''' refers first to a branch of [[mathematics]] that specializes in enumeration [[data]] and their relation to measured [[data]]. It may also refer to a [[Fact of classification|fact of classification]], which is the chief source of all statistics. | '''Statistics''' refers first to a branch of [[mathematics]] that specializes in enumeration [[data]] and their relation to measured [[data]]. It may also refer to a [[Fact of classification|fact of classification]], which is the chief source of all statistics. | ||
In the singular, a statistic refers to a derived numerical value, such as a [[mean]], a [[coeffecient of correlation]], or some other single [[Descriptive statistics|descriptive]] concept. It may also refer to an idea of an average, such as a [[median]], or [[standard deviation]], or a value computed from a [[set]] of data. <ref>Guilford, J.P., Fruchter, B. (1978). ''Fundamental statistics in psychology and education''. New York: McGraw-Hill.</ref> | In the singular, a statistic refers to a derived numerical value, such as a [[mean]], a [[coeffecient of correlation]], or some other single [[Descriptive statistics|descriptive]] concept. It may also refer to an idea of an average, such as a [[median]], or [[standard deviation]], or a value computed from a [[set]] of data. <ref>Guilford, J.P., Fruchter, B. (1978). ''Fundamental statistics in psychology and education''. New York: McGraw-Hill.</ref> More generally, a statistic can be any [[measurable function]] of the data samples, the latter being realizations of the [[random variable|random variables]] which are of interest such as the height of people, polling results, students' performance on a test, and so on. | ||
==See also== | ==See also== | ||
Revision as of 07:54, 10 November 2007
Statistics refers first to a branch of mathematics that specializes in enumeration data and their relation to measured data. It may also refer to a fact of classification, which is the chief source of all statistics.
In the singular, a statistic refers to a derived numerical value, such as a mean, a coeffecient of correlation, or some other single descriptive concept. It may also refer to an idea of an average, such as a median, or standard deviation, or a value computed from a set of data. [1] More generally, a statistic can be any measurable function of the data samples, the latter being realizations of the random variables which are of interest such as the height of people, polling results, students' performance on a test, and so on.
See also
- Coefficient of correlation
- Data
- Descriptive statististics
- Mathematics
- Mean
- Median
- Mode
- Psychometrics
- Set
- Standard deviation
References
- ↑ Guilford, J.P., Fruchter, B. (1978). Fundamental statistics in psychology and education. New York: McGraw-Hill.