Mean

n

Median

STDEV

Cp Cpk % out of tolerance

Min/Max

Compare with

Calculate Difference

Diff mean normally

Diff median not normally

Diff variation normally

Diff variation not normally

Normally test

Correlation

Regression

Kurtosis

Skewness

For commersial use

75 EURO

Calculates how symmetrical the data-set is, zero indicates perfect symmetry.

=0 is normal.

<0 the lower the Skewness value is the more skewness is to the right.

Data file

- Lifetime data is often not normal distributed (wear out)
- Data is close to zero or a other limit
- Mix of more distributions
- With a small sample size the skewness value can not be trusted

=Mean

- http://en.wikipedia.org/wiki/Skewness
- http://www.itl.nist.gov/div898/handbook/eda/section3/eda35b.htm
- http://statistics.about.com/od/Descriptive-Statistics/a/What-Is-Skewness.htm