Uncertainty analysis software comparison - error sources and distributions

Products Software UncertaintyAnalyzer 3.0 Software Comparison Errors and Distributions

Identifying Error Sources and Distributions

Since measurement process errors are the basic elements of an uncertainty analysis, it is important to compare how the different software applications assist the user in identifying and describing them.

A ü 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
Maximum Number of Error Sources Allowed¹	40	15	Over 1,000	25	25	Over 1,000	512
Identifies Measurement Process Errors²		ü		ü		ü
Available Error Distributions³	Normal Rectangular Triangular U-Shaped Student's t	Normal Uniform Student's t	Normal Quadratic Cosine Trapezoidal Uniform Triangular U-Shaped Student's t	Normal Lognormal Exponential Uniform Student's t	Normal Rectangular Triangular U-Shaped Student's t	Normal Lognormal Exponential Quadratic Cosine Uniform Triangular U-Shaped Student's t	Normal Trapezoidal Rectangular Triangular U-Shaped Student's t
Error Distribution Plots		ü		ü		ü
Default Distribution Selection	Student's t with Degrees of Freedom >100						Rectangular
Assistance in Selecting Appropriate Distributions		ü		ü		ü
Computation of Bounding Limits for Distributions						ü

1 All measurement process errors that can be defined and analyzed in templates, screens and worksheets.

2 Interactive procedure checklists and error source tables automatically include most commonly encountered measurement process errors such as operator bias, environmental factors error, and resolution error. User defined error sources can also be included.

3 The uniform and rectangular distributions are the same statistical distribution.

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Page Updated February 12, 2015