QUALITY CONTROL QUALITY ASSURANCE Data Assessing data quality

QUALITY CONTROL / QUALITY ASSURANCE Ø Data Ø Assessing data quality Control charts Acceptance limits Evaluation of a control chart Ø Reporting data Measurement uncertainty Qualifiers

QUALITY CONTROL / QUALITY ASSURANCE Ø Assessing data quality • Control charts: Shewhart charts as Avg. -charts recovery rate charts Range control charts • Acceptance limits: Upper & lower control limits Upper & lower warning limits • Evaluation of a control chart

QUALITY CONTROL / QUALITY ASSURANCE Ø Control charts: ØAvg. charts & range control samples pure standard solutions synthetic samples reference samples certified reference material ØRecovery Rate Samples spiked natural samples / matrix influences

QUALITY CONTROL / QUALITY ASSURANCE Ø Control charts: Ø Avg. charts equations %CV = standard deviation • 100 mean (avg. ) % Bias = measured x - known x • 100 known value Ø Recovery rate samples RR = (actual increase of x) • 100% (expected increase) = (xspiked – xunspiked) • 100% ( x expected) RR = (Xact) • 100% Xexp

QUALITY CONTROL / QUALITY ASSURANCE Ø Control charts: Ø Range control charts Ri = largest value – smallest value of a subgroup I _ consisting of n single measurements R = Ri N

QUALITY CONTROL / QUALITY ASSURANCE • Control charts: Shewhart charts as Avg. - charts Recovery rate charts Range control charts

QUALITY CONTROL / QUALITY ASSURANCE Ø Reporting • data Measurement uncertainty • Qualifiers