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Descriptive Statistics *October 7, 2007*

*Posted by Coolguy in Six Sigma Measure Phase.*

Tags: Statistics

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Tags: Statistics

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Types are

- Central tendency
- Dispersion
- Probability Density
- Frequency Distribution
- Cumulative Distribution

*Central Tendency:*

Measures the central value of a collection of data.

Three measures are mean,mode and median.

- Mean: Sum of all divided by number of data points
- Mode: Most frequently occurring number in the data set
- Median: Middle value when data is arranges in ascending order or descending order

* Measures of dispersion*

Uses to describe the spread or dispersion.

Four measures are range, variance standard deviation & COV

- Range: Difference between largest and smallest values
- Variance
- Standard Deviation
- Coefficient of Variation

*Probabilty Density*

Describes behavior of random variable.

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