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Control charts (Tipos de gráficas de control (Attribute (Discreta) (u…
Control charts
Tipos de gráficas de control
Attribute (Discreta)
u Gráfica ( Número de defectos por unidad)
np Gráfica (número de unidades defectuosas)
c Gráfica (Número de defectos
Using for monitoring and analyzing
a process by number of product defects.
p Gráfica (Fracción defectuosa)
Used when quality characteristic
is symbolized by number of defective units of fraction defective
Variable (Continuo)
Indivual, valor medido
Promedio y rango
Used for controlling and analyzing a process using continuous values of product quality
length, weight, concentration.
The Zone Rules
Distinguish unnatural patterns from natural patterns
The absence of point near the centerline
The absence of points near the center line
Zona A
Within 2 sigma of centerline and control limit (3 sigma)
Zona C
Within 1 sigma of the centerline
The presence of points outside the control limits
Other unnatural patterns: repetition, trend.
Zona B
Within 1 sigma and 2 sigma of centerline