USE_STD_TARGET_FOR_PERCENT_DIFFERENCE

BOOLEAN

When the system is performing a standard assessment and calculating Percentage Difference, then:

• If checked (default on deploy; default if missing) and the calculation is for a blank or standard QC sample, then the calculation is:

  Xbar = Absolute Value (standard lot specification scheme version analyte's Expected Value)
  
  If Xbar = 0 then Percentage Difference = 0
  
  If Xbar <> 0 then Percentage Difference = Absolute Value (standard lot specification scheme version analyte's Expected Value—sample scheme analyte's Numeric Final Value) x 100 / Xbar

• Otherwise if checked (default on deploy; default if missing) and the calculating is for a spike QC sample, then the calculation is:

  Xbar = Absolute Value (standard lot specification scheme version analyte's Expected Value))
  
  If Xbar = 0 then Percentage Difference = 0
  
  If Xbar <> 0 then Percentage Difference = Absolute Value (standard lot specification scheme version analyte's Expected Value—(scheme version analyte's Numeric Final Value—spike original scheme version analyte's Numeric Final Value)) x 100 / Xbar

• Otherwise if cleared and the calculation is for a blank or standard QC sample, then the calculation is:

  Xbar = Absolute Value (standard lot specification scheme version analyte's Expected Value + sample scheme analyte's Numeric Final Value) / 2
  
  If Xbar = 0 then Percentage Difference = 0
  
  If Xbar <> 0 then Percentage Difference = Absolute Value (standard lot specification scheme version analyte's Expected Value—sample scheme analyte's Numeric Final Value) x 100 / Xbar

• Otherwise if cleared and the calculation is for a spike QC sample, then the calculation is:

  Xbar = Absolute Value (standard lot specification scheme version analyte's Expected Value + (sample scheme analyte's Numeric Final Value—spike original sample scheme analyte's Numeric Final Value)) / 2
  
  If Xbar = 0 then Percentage Difference = 0
  
  If Xbar <> 0 then Percentage Difference = Absolute Value (standard lot specification scheme version analyte's Expected Value—(sample scheme analyte's Numeric Final Value—spike original sample scheme analyte's Numeric Final Value)) x 100 / Xbar

Typically the preference is not set at role or user level.

Related Processes

• Configuring Analysis