Descriptive statistics
Statistical tests
Design of Experiment
Gage RR
Problem resolution
Reliability
Control plan
User's Guide Menu

User Guide

Dispersion

The standard deviation is a good characteristic of normal distribution on the mathematical plan, but it is not really intuitively equivalent. We therefore prefer to use the term "dispersion" that corresponds to:
Dispersion = width of the interval value within which we observe 99.73% of values.
With a normal distribution the dispersion is calculated simply
The concept of dispersion is much more intuitive than standard deviation. Let us take the example using the following data. An observation of 1000 pieces of data in a normal distribution with an average of 0 and standard deviation of 1:
dispersion1
If we want to intuitively characterize the dispersion of these values, we would be tempted to say that the value dispersion is around 6 as the observed values are limited between -3 and +3.
Our intuitive definition of the dispersion actually corresponds to the sample range (Range= Max - Min). However, using the range as a characteristic of a distribution has no statistical direction. Actually, the normal distribution varies from -infinity to +infinity making the range of this distribution infinite.
The dispersion corresponds to the intuitive definition of the dispersion all while having a statistical direction. This is an interval within which we will observe practically all the values, i.e. 99.7% of values.

A complete solution for Industry 4.0

8 Statistical Modules

trial

Trial

0

1 month

Try it for free

APC

SPC

Control

Analysis

check

1 month

check

All feature's of Ellistat's Analysis Module.

check

1 user

Technical support and updates included.

student

Student / Teacher

0

1 year

Checkout

Analysis

check

1 year

check

All feature's of Ellistat's Analysis Module.

check

1 user

check

Dedicated student licence upon presenting a valud student card.

Technical support and updates included.

standard

Standard

49

per user per month

Checkout

Analysis

check

Automatic monthly renewal

check

All feature's of Ellistat's Analysis Module.

check

Unlimited users.

check

Technical support and updates included.