Reduce your costs by allocating the right amount of variation
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OVERVIEW

Allocation identifies the amount of parameter variation that will improve a response's variation to a desired level. (This is often referred to as statistical tolerancing or requirements flowdown.) With allocation you can specify a desired value for response standard deviation or response PNC (Probability of Non-Compliance) and the algorithm will compute a vector of parameter standard deviations that will meet your objective. Driver values are used to help guide the parameter standard deviations in sensible directions.

FEATURES

  • Identify tolerances that are too tight or too loose
  • Quantify risk of not meeting requirements
  • Easy-to-use and learn interface
  • Unlimited number of factors*
  • Truly statistical tolerancing
  • Define parameter variability budgets and tolerances that strike the right balance between quality & cost
  • Advanced calculations for numerical derivatives
  • 2nd-order analysis
  • User-selectable allocation drivers
  • Nonlinearity test and warning

*Constrained only by worksheet size/memory limits in MS Excel™

BENEFITS

When a response’s variation is computed with sensitivity analysis, very often the amount of variation is not ideal. Perhaps the response’s standard deviation or Probability of Non-Compliance (PNC) is too large. Or on the other hand, perhaps some of the parameters’ standard deviations are much smaller than they need to be, leading to higher costs of such tight control.

With allocation you can specify a desired value for response standard deviation or response PNC and the algorithm will compute a vector of parameter standard deviations that will meet your objective. Driver values are used to help guide the parameter standard deviations in sensible directions.

REQUIREMENTS

  • Microsoft Windows 7, 8, 10, 11
  • Microsoft Excel 2016, 2019, 2021, 365
  • WARNING: SDI Tools does not support these versions of Office 365 (Office from Microsoft Store, Office Online, Office for Mac, Office for iOS)
  • Administrator rights required to install software

INPUT PARAMETERS

  • Define input parameters as: Continuous, Integer, Discrete, Noise, Constant

DEFINING DISTRIBUTIONS

  • Probability distributions can be defined as: Normal, Uniform, Triangular, Lognormal, Exponential, Weibull, Beta, Gamma, Johnson, or Histogram.
  • Multiple distributions can be combined and/or truncated to create unique composite distributions.

OUTPUT RESPONSES

  • Define the lower and/or upper specification limits for each output response.
  • Define the Probability of Non-Compliance (PNC) goal.

WORKSHEET MODELS

  • Define input parameters and output responses on Excel worksheets.
  • Define indicators of each cell type

FORMULATION EDITOR

  • Quickly modify the problem using the Formulation Editor.

VIDEOS

This video shows Statistical Allocation using SDI Tools v3 in action. We will be updating this video to reflect changes to SDI Tools v4 soon.

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SDI Tools 4.13.2 is available