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Descriptive Statistics October 7, 2007

Posted by Coolguy in Six Sigma Measure Phase.
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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.

  1. Mean: Sum of all divided by number of data points
  2. Mode: Most frequently occurring number in the data set
  3. 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

  1. Range: Difference between largest and smallest values
  2. Variance
  3. Standard Deviation
  4. Coefficient of Variation

Probabilty Density

Describes behavior of random variable.