## What is the Variation in Measurement System? | Types of variation

### 1) What is the Variation in Measurement System?

→ Variation is sometimes described as spread or dispersion to distinguish it from systematic trends or differences.

→ Measures of variation are either properties of a probability distribution or sample estimates of them.

→ The range of a sample is the difference between the largest and smallest value.

→ The observed variation in process output measurements is not simply the variation in the process itself, but it is the variation in the process plus the variation in the measurement that results from an inadequate measurement system.

#### ➤ Variation in a Measurement system:

→ The

**variation**in the measurement system is mentioned in the below picture.
→ Classification of

**Variation**Related to Measurement System:
→ There are different sources of

**variation**available in the measurement system.#### ➤ The observed process variation is divided into two main parts:

(1) The actual process variation and

(2) The measurement variation.

(1) The actual

**variation**is due to the below parameter in the system
e.g. Cycle time

Dimension data

Number of defects

Some other factor

(2) The measurement

**variation**further divided into two parts
(A) Precision (related to variability)

(B) Accuracy (related to central location)

(A) Precision is divided into 3 parts

(a) Resolution

(b) Repeatability

(c) Reproducibility

(B) Accuracy is divided into 3 parts

(a) Linearity

(b) Bias

(c) Stability

→ Both have a common factor which is the

**variation**within a sample.#### ➤ The classification of the observed variation is mentioned below:

→ The observed

**variation**is classified in a different category as mentioned in the below picture
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