Table 2 Different types of uncertain variables with different meanings for grading
From: Determination of Target Values of Engineering Characteristics in QFD Using Uncertain Programming
Type | Uncertain variables | W | R | P |
|---|---|---|---|---|
I | Φ(x)=x 1/9 | extremely unimportant | extremely weak | strong negative |
II | Φ(x)=x 1/6 | very unimportant | very weak | very negative |
III | Φ(x)=x 1/4 | quite unimportant | quite weak | quite negative |
IV | Φ(x)=x 1/2 | some important | weak | weak negative |
V | Φ(x)=x | moderately important | medium | medium |
VI | Φ(x)=x 2 | important | strong | weak positive |
VII | Φ(x)=x 4 | quite important | quite strong | quite positive |
VIII | Φ(x)=x 6 | very important | very strong | very positive |
IX | Φ(x)=x 9 | extremely important | extremely strong | strong positive |