Product listing

ROFA Precision Calculation Tools

by ROFA

Standards

  • ISO
    • 13528
    • 4259-1
    • 4259-3
    • 4259-5
    • 5725-2
    • 5725-5
  • ASTM
    • D6300
    • D6708

Countries

  • Worldwide

The precision of analytical test methods expressed as repeatability and reproducibility is the closeness of agreement between independent results obtained under stipulated conditions and play an important role for test method developers and specification writers as well as for certifying products according the product specifications. ROFA works closely with statisticians and industry experts to provide the unique solution for precision determination of measurement methods under ISO and ASTM.

TOOLABOUTMETHOD
ILS Evaluatordetermines precisionISO 4259-1
ASTM D6300
PTP Evaluator compares standard deviation vs. published precisionISO 4259-3
Method Comparator assesses two test methods that measures the same property of a materialISO 4259-5
ASTM D6708
CRM CalculatorCalculation of the accepted reference value from round robin tests (under development)ISO 5725-2
ISO 5725-5
ISO 13528

Each of these modules can be used as Stand-Alone Software!

ILS Evaluator

Determines the precision of test method based on data from Inter-Laboratory Studies (ILS) according to ISO 4259-1 Petroleum and related products.

The first step is the GESD outlier test. After each outlier test, the affected results are listed in a table
If the precision depends on the measured value, a transformation of the data must be carried out, whereby the decision which transformation is to be used is supported by red / green symbols and graphics.

A report in text or PDF format can be generated from the result of the precision calculation, with numerous plots being included.

PTP Evaluator

Compares the standard deviation achieved in Proficiency Testing Programs versus the published precision according ISO 4259-3: Petroleum and related products.

Import from Excel, text file or:

For proficiency test programs over longer periods of time in which the comparability of a measurement method has changed, this can be entered separately for individual samples or for groups.

The parameters m, s and c used to calculate the z-score can be freely defined in such a way that most variants of the z-score (z,-score, zeta-score, etc.) can be calculated.

A report in text or PDF format can be generated from the result of the precision calculation, with numerous plots being included.

Method Comparator

Assesses statistically two test methods that measures the same property of a material according ISO 4259-5 (in preparation) and ASTM D6708.

The results of the interlaboratory comparisons of the two measurement methods to be compared can be used as a source, whereby the data can be taken over directly by the ILS evaluator (or import from Excel / text file).

The precision (repeatability and comparability) can be entered manually in different forms.

A report in text or PDF format can be generated from the result of the precision calculation, with numerous plots being included.

CRM Calculator

The CRM Calculator calculates the accepted reference value for a certified reference material from a round robin test and is still under development.