Cp: This is a capability index. It compares the process capability to the
maximum allowable variation as indicated by the tolerance. This index
provides a measure of how well the process will satisfy the variability
requirements.
Cpk: This is a capability index. It takes the process location as well as the
capability into account. For bilateral tolerances Cpk will always be less
than or equal to Cp.
Pp: This is a performance index. It compares the process performance to
the maximum allowable variation as indicated by the tolerance. This
index provides a measure of how well the process will satisfy the
variability requirements.
Ppk: This is a performance index. It takes the process location as well as
the performance into account. For bilateral tolerances Ppk will always be
less than or equal to Pp. Ppk will be equal to Pp only if the process is
centered.
因此，Capability Indies of Process既可以使CP，也可以是CPK，通常两者都进行计算并对比。
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李慕秋 (威望:7) (陕西 西安) 汽车制造相关 质量副部长
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maximum allowable variation as indicated by the tolerance. This index
provides a measure of how well the process will satisfy the variability
requirements.
Cpk: This is a capability index. It takes the process location as well as the
capability into account. For bilateral tolerances Cpk will always be less
than or equal to Cp.
Pp: This is a performance index. It compares the process performance to
the maximum allowable variation as indicated by the tolerance. This
index provides a measure of how well the process will satisfy the
variability requirements.
Ppk: This is a performance index. It takes the process location as well as
the performance into account. For bilateral tolerances Ppk will always be
less than or equal to Pp. Ppk will be equal to Pp only if the process is
centered.
因此，Capability Indies of Process既可以使CP，也可以是CPK，通常两者都进行计算并对比。