Quality Advisor

A free online reference for statistical process control, process capability analysis, measurement systems analysis, and control chart interpretation, and other quality metrics.

Glossary

A | B | C | D | E | H | I | K | L | M | N | O | P | R | S | T | U | V | X | Z

A

alpha value
assignable cause
attributes data
average

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B

bell curve
bias
bimodal distribution

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C

capability
capability analysis
capable process
c-chart
central location
central tendency
characteristic
chi-square
coefficient of variance
common cause
control charts
control limits
Cp
Cpk
Cpl
Cpm
Cpu
Cr

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D

defect
defective
discrimination
dispersion
distribution

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E

estimated sigma

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H

histogram

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I

in control
individual control chart

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K

kurtosis

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L

lower control limit
lower specification limit

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M

maximum acceptable subgroup size
mean
measurement system
median
minimum acceptable subgroup size
mode
moving range
moving range chart

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N

negatively skewed distribution
nonconforming
nonconformities
nonnormal data
nonnormal data distribution
nonrandom pattern
normal curve
normal distribution
normal probability plot
np-chart

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O

observation
operational definition
outlier
out-of-control
overcontrol

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P

Pareto chart
p-chart
positively skewed distribution
Pp
Ppk
Ppl
Ppu
Pr
process
process capability
process performance

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R

random distribution
random sample
range
repeatability
reproducibility
run chart

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S

sample
sample size
sigma of the individuals
sigma
skewed distribution
skewness
special cause
specification limits
spread
stable process
standard deviation
statistical control
subgroup
symmetrical distribution

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T

target value
trial limits

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U

u-chart
undercontrol
uniform distribution
unstable system
upper control limit
upper specification limit

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V

variability
variables
variation

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X

X-bar
X-bar chart

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Z

Zlower
Zmin
Zupper
Z value

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