Short-Run Control Chart for Multiproducts with Multi-Items Based on Unequal Means and Variances

Table 1

Basic statistics of four SPC products.

Product	Parameter	Observations	Mean
Lamp bracket of Pride	Height of bent	24	40.00
	Length to the edge of bent	24	200.01
	Width to the edge of bent	24	140.01
	Punch diameter	24	10.80
Lock protection of Samand	Height of bent 1	24	40.00
	Height of bent 2	24	20.00
	Length	24	300.00
	Distance to punch center	24	100.01
Lock protection of 206	Height of bent	24	20.00
	Length	24	300.01
	Width	24	200.01
	Punch diameter	24	10.20
Lower holder of injector	Length	24	300.01
	Height of bent 1	24	70.00
	Height of bent 2	24	70.01