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Statistical tests to verify the normality of the data
Graphical method
: Henry line, Quantile-Quantile plot (Q-Q plot)
Numerical methods
: Shapiro-Wilk test, Anderson-Darling test,
Kolmogorov test…
✓
Aligned points
Hypothesis of a normal distribution
✓
Statistical softwares can easily do those tests
✓
The value of p-value measures how far the data is from a normal
distribution.
✓
Choice depends on your data
Cumulative percentages
✓
Can be done without any particular
sofware.
✓
Not as powerful as numerical tests.
Part 1
:
Introduction to
SPC
Part 2
:
Essential
concepts to
start with SPC
Part 4
Conclusion
Part 3
:
SPC in
practice
A
NALYZE
5. Characterization of the data distribution
Intervals
18
03/10/17