Glossary

C

C Bar

The average for counted attribute characteristics as a count.

Characteristic

A characteristic is an aspect of an item, process, or physical entity that can be measured. You can configure characteristics for variables and attributes, and associate them with categories.

Consumption

Items consumed in the plant floor.

Context

One or more aspects of a situation when quality data is gathered, such as the entity, entity class, or item that determines which QM specification is applicable.

Cp

The ratio of the difference between the upper and lower specification limits and six times the estimated standard deviation based on sample variability.

CpK

The ratio of the difference between the upper and lower specification limits and six times the estimated standard deviation based on sample variability.

D

Defects Per Million Opportunities (DPMO)

The average count of defects for every 1 million opportunities, where a single unit may have more than 1 opportunity for a specific defect. This value is only applicable for counted attribute characteristics.

Defects Per Million Opportunities (DPMO) Chart

A chart of the number of defects per million opportunities of a series of samples for a certain (counted attribute) characteristic.

F

Fraction Defective

The ratio of defects to sample size, for a single sample point.

L

LRL

The lower reasonable limit for a specification. You are not allowed to enter results lower than this.

M

Moving Average

A value that specifies the average of individual readings from a certain number of consecutive individual readings.

Moving Average Bar

A value that specifies the average of moving averages.

Moving Range

A value that specifies the difference between the highest and lowest individual readings among a certain number of consecutive individual readings.

Moving Sigma

A value that specifies the standard deviation (σ) from a certain number of consecutive individual readings.

N

NP Bar

The average for binary attribute characteristic as a count.

NP Chart

A chart of the count of the number of defective units from a series of samples for a specific (binary attribute) characteristic.

P

P Bar

The average for a binary attribute characteristic as a ratio to sample size.

P Chart

A chart of the proportion of defective units for a series of samples for a specific (binary attribute) characteristic. Being normalized to the equivalent for a single unit, it allows samples of different sizes to be compared.

Path

The hierarchy of files through which control passes to find a particular file.

Pp

The ratio of the difference between the upper and lower specification limits and six times the estimated standard deviation based on the entire measured population.

PpK

The ratio of the difference between the upper and lower specification limits and six times the estimated standard deviation based on the entire measured population.

R

R Bar

A value that specifies the average range of values from various samples.

S

Sample Average

A value that gives the average of the set of results for a particular characteristic of a sample.

Sample Size

Total number of measurements in a sample.

Specification

A description of desired results related to a manufacturing operation or product.

StdDev (σ)

A value that specifies the statistical measure of spread or variability.

U

U Bar

The average for counted attribute characteristics as a ratio to sample size.

U Chart

A chart of defects per unit for a series of samples for a particular (counted attribute) characteristic. Being normalized to the equivalent for a single unit, it allows samples of different sizes to be compared.

Upper Reasonable Limit (URL)

The upper reasonable limit for a specification. You are not allowed to enter results higher than this.