Menu della guida per l'utente

Guida utente

The alias concept

An alias is the fact that, between two factors, the factors have the same level for the totality of experiments in a design of experiments.
For example, suppose that the following design of experiments was carried out
ABY
115
115
2210
2210
Factors A and B vary at the same time, so it is not possible to differentiate factors A and B nor is it possible to say which of the two causes the variance of Y from 5 to 10 when it moves from 1 to 2.
These two factors are called aliases.
Obviously, when building a design of experiments, the tests are carefully chosen so that each factor does not become an alias of another factor. However, it is still possible for a factor to become the alias of an interaction.Let us take the following example:
Alias 1
In this example we have built a plan with three factors using the table L4. In the alias table the following is observed:
Factor a is an alias to the b*c interaction
Factor b is an alias to the a*c interaction
Factor c is an alias to the a*b interaction
Similarly, if two factors are aliases then it is not possible to say, at the end of the design of experiments, whether the observed effect is due to factor a at the bc interaction or the sum of the two. We therefore assume that the bc interaction is null, though it must be verified experimentally.
To avoid this type of problem, design of experiments are generally chosen where none of the factors is alias to an interaction.In the preceding example we could have chose the L8 plan where none of the factors is alias to an interaction.
Alias 2

Una soluzione completa per l'Industria 4.0

8 moduli statistici

trial

Test

€ 0

30 giorni

Testalo gratuitamente

APC

SPC

Controllo

Analisi

check

30 giorni

check

Tutte le funzioni di Ellistat

check

1 utente

Supporto tecnico e ed aggiornamenti inclusi

student

Studenti

€ 0

1 anno

Checkout

Analisi

check

1 anno

check

Tutte le funzioni di Ellistat

check

1 utente

check

Licenza dedicata agli studenti che dispongono di una tessera studente in corso di validità

Supporto tecnico e ed aggiornamenti inclusi

standard

Standard

€ 49

per utente al mese

Checkout

Analisi

check

Licenza rinnovata ogni mese

check

Tutte le funzioni di Ellistat

check

Utenti illimitati

check

Supporto tecnico e ed aggiornamenti inclusi