Standard deviation (STDEV)

Calculates the STDEV () of the data-set. The STDEV is an indication of the variation of the data. A small STDEV means a small variation and the data points are close to the Mean.
STDEV or includes all the variation in the process, for short therm variation see STDEV within

Interpretation

• The bigger the STDEV the bigger the variation in the data-set.

Formula

95% confidence interval for STDEV

To get the Confidence interval click on the graph of the data-set and it will be visible in the graph pop-up.

Legend

n = n
=Mean
s = STDEV

Example

The STDEV of samples in data-set A is 1.1136, this is visible in row STDEV of the result array.

Data file

Statistics

Difference between 2 variations

• Normal Distribution Variation F-test
• Not Normal Distribution Variation Levene test

Difference between multiple variations

• Normally and Not Normal Distribution Variation Levene test

External links

• http://en.wikipedia.org/wiki/Standard_deviation