Be able to design the correct SPC chart type, rational sub-grouping, and sampling frequency.
能够设计正确的制程能力图的种类，明确抽样数量和抽样频率。
2
Grouping is indicated by parentheses: any sub-expression contained in parentheses is treated as if it were atomic for the purpose of further grouping or repetition.
由括号表示分组：括号中包含的任何子表达式都被看作是用于以后分组或循环的原子。
3
A method taking multi samples as sub modes and grouping face modes into partial intersection ones was proposed to reduce computation and improve system extension property.