如何解释误差（MSA和SPC说法不同）
MSA里观察值总误差=产品本身误差+测量系统误差
SPC里面，误差=特殊原因误差（组间差异）+普通原因误差（组内差异）
两者研究的方向不同，但都是误差，怎么解释说法不一样那？理解上有点迷糊， 请专家解答，最好能举例说明一下。
SPC里面，误差=特殊原因误差（组间差异）+普通原因误差（组内差异）
两者研究的方向不同，但都是误差，怎么解释说法不一样那？理解上有点迷糊， 请专家解答，最好能举例说明一下。
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george.cao (威望:13) (江苏 苏州) 机械制造 主管 - 98年毕业
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The effects of the various sources of variation on the measurement system should be evaluated over a short and long period of time. The measurement system capability is the measurement system (random) error over a short period of time. It is the combination of errors quantified by linearity, uniformity, repeatability and reproducibility. The measurement system performance, as with process performance, is the effect of all sources of variation over time. This is accomplished by determining whether our process is in statistical control (i.e., stable and consistent; variation is due only to common causes), on target (no bias), and has acceptable variation (gage repeatability and reproducibility (GRR)) over the range of expected results. This adds stability and consistency to the measurement system capability.
以上蓝色字体 “测量系统能力是指短期的测量系统（随机）变差，它是线性、均一性、重复性和再现性结合的变差”到底是啥意思呢？
难道再现性变差也可解释为随机变差？