PROC CAPABILITY Statement

The CAPABILITY Procedure

PROC CAPABILITY Statement

You can assign parameter values for several of the specialized capability indices calculated when you specify the SPECIALINDICES option.

SPECIALINDICES <(parameter-list)>

requests a table of specialized process capability indices. These indices are k, Boyles' modified C_pm (also denoted as C_pm+), C_jkp, C_pm(a), C_p(5.15), C_pk(5.15), C_pmk, Wright's C_s, Boyles' S_jkp, C_pp, C_pp^'', C_pg, C_pq, C_p^W, C_pk^W, C_pm^W, C_pc, and V $\ddot{a}$ nnmann's C_p(u,v) and C_p(v). You can provide values for the parameters a for C_pm(a), u and v for C_p(u,v) and C_p(v), and for the $\gamma$ multiplier for C_s by specifying the following options in parentheses after the SPECIALINDICES option.

CPMA=value: specifies the value of the parameter a for the capability index C_pm(a) described in Section 3.7 of Kotz and Johnson (1993). The value must be positive. The default value is 0.5. The existing CPMA= option in the PROC CAPABILITY statement is considered obsolete but still works.
CPU=value: specifies the value of the parameter u for V $\ddot{a}$ nnmann's capability index C_p(u,v). The value must be greater than or equal to zero. The default value is zero.
CPV=value: specifies the value of the parameter v for V $\ddot{a}$ nnmann's capability indices C_p(u,v) and C_p(v). The value must be greater than or equal to zero. The default value is 4.
CSGAMMA=value: specifies the value of the $\gamma$ multiplier suggested by Chen and Kotz (1996) for Wright's capability index C_s. The value must be greater than zero. The default value is 1.

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