CRM的不确定性意味着什么？
不确定性表示在规定的概率下可以预期“真实”属性值的范围。如果材料用于校准，则可以直接使用此信息。当材料用于估计方法偏差时，用户实验室中获得的结果的不确定度范围应与证书上给出的不确定性范围重叠。如果这是真的，则用户用于确定属性的方法是无偏的。CRM用户应注意仅比较等效的统计参数，例如置信区间（而不是证书中具有扩展不确定性的测量的SD）。
What does the CRM uncertainty mean?
The uncertainty indicates the range where the “true” property value can be expected with a stated probability. This information can be used directly, if the material is used for calibration. When the material is used to estimate method bias, the uncertainty range for the result obtained in the laboratory of the user should overlap with the uncertainty range given on the certificate. If this is true, the method applied by the user for determining the property is unbiased. The CRM user should take care to compare only equivalent statistical parameters, i.e. for instance confidence intervals (and not the SD from a measurement with expanded uncertainties from a certificate).
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