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Products Software UncertaintyAnalyzer 3.0 Software Comparison Type B Estimates

 

Type B Uncertainty Estimates

 

In some cases, we must attempt to quantify the statistics of measurement error distributions by drawing on our recollected experience concerning the values of measured quantities or on our knowledge of the errors in these quantities.  Estimates made in this manner are called heuristic or Type B estimates.

 

In making Type B estimates, we begin with containment limits and a containment probability, estimate the degrees of freedom, and use these quantities to estimate the standard deviation or uncertainty of the distribution of interest.

 

A in the cell indicates that the particular capability or feature is available.  Alternatively, a blank cell indicates that the capability or feature is not available.  Comments and footnotes are included to clarify significant differences between software applications or to provide necessary details.

 

Features

and

Capabilities

Uncertainty Calculator 3.2

Uncertainty

Sidekick

1.0

 

Assistant

2.3

Uncertainty

Sidekick

Pro 1.0

Uncertainty

Toolbox

2.8

Uncertainty

Analyzer

3.0

GUM

Workbench

1.3

Analysis

Options for

Estimating

Type B

Uncertainty

Enter

Standard

Uncertainty

for Selected

Distribution

Enter

Standard

Uncertainty

for Normal

Distribution

Enter

Standard

Uncertainty

for Student's t

Distribution

Enter

Standard

Uncertainty

for Selected

Distribution

 

Enter

Standard

Uncertainty

for Selected

Distribution

Enter

Standard

Uncertainty

for Student's t

Distribution

Enter

Expanded

Uncertainty

& Coverage

Factor

for Selected

Distribution

Enter

Containment

Limits1

&

Coverage Factor for Normal Distribution

Enter

Expanded

Uncertainty

& Coverage

Factor

for Normal

Distribution

Enter

Containment

Limits

& Coverage

Factor

for Selected

Distribution

Enter

Expanded

Uncertainty

& Coverage

Factor

for Normal

Distribution

Enter

Containment

Limits

& Coverage

Factor

for Selected

Distribution

Enter

Expanded

Uncertainty

& Coverage

Factor

for Normal

Distribution

Enter

Expanded

Uncertainty

&

Confidence

Level

for Selected

Distribution

Enter

Containment

Limits

&

In-Tolerance

Probability for Normal or Uniform Dist.

Enter

Bounding

Limits

for Other

Distributions

Enter

Containment

Limits

&

Confidence

Level

for Selected

Distribution

Enter

Uncertainty

Limits

for Other

Distributions

Enter

Containment

Limits

&

Confidence

Level

for Selected

Distribution

Enter

Bounding

Limits

for Other

Distributions

Advanced

Screens for

Type B

Estimates2

 

     

Symmetric

&

Asymmetric

Two-sided

Tolerance

or

Error Limits

     

One-sided

Tolerance

or

Error Limits

 

 

 

Compute

Tolerance

Limits from

Linear or RSS

Combination

of Instrument

Specifications

 

 

 

Compute

Tolerance

Limits from

Complex

Instrument

Specifications3

 

 

 

 

 

 

Degrees of

Freedom

Estimation

 

See

Footnote4

See

Footnote5

See

Footnote4

See

Footnote5

See

Footnote4

 

 

1  Containment limits refer to expanded uncertainty, tolerance limits, or other error limits.

2  Specialized drill-down screens for estimating uncertainties due to resolution error, operator bias, environmental factors error, etc.

3  Built-in SpecMaster tool for computing tolerance limits from complex specifications using VB Script programming language.

4  Built-in Type B Degrees of Freedom Calculator that provides user-friendly, yet rigorous approach to simultaneously estimating uncertainty and degrees of freedom.

5  Simple calculation that requires user to enter "relative" uncertainty in the uncertainty.

 

 

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Page Updated February 12, 2015