Research Article

Fuzzy Approach to Statistical Control Charts

Table 1

Estimated parameters of the “yellowness” and “blackness” membership function.

YellownessBlack

Coefficient value−3.86720.849Coefficient value4.0568−0.716
-student value6.0123.08 -student value6.8125.82

Yellowness: -adj = 96.8, = 219.73, , .
Black: -adj = 95.2, = 321.69, , .