Six Sigma Tools for Quality Control and Improvement

Functions and utilities to perform Statistical Analyses in the Six Sigma way. Through the DMAIC cycle (Define, Measure, Analyze, Improve, Control), you can manage several Quality Management studies: Gage R&R, Capability Analysis, Control Charts, Loss Function Analysis, etc. Data frames used in the books "Six Sigma with R" [ISBN 978-1-4614-3652-2] and "Quality Control with R" [ISBN 978-3-319-24046-6], are also included in the package.


  • Improvements in function ss.rr: allow arguments errorTerm and alphaLim; changes in computations for compliance with AIAG MSA.
  • By default, error term in ANOVA table of ss.rr is interaction, so results with the default values may differ from the ones obtained in previous versions
  • Default value of sigma in ss.rr is 6 instead of 5.15
  • Control limits of the range control chart in ss.rr are now correctly computed
  • Add profiles examples to package help file
  • Fix all issues and warnings with ggplot2
  • fix issue and warning with ggplot2
  • ss.rr: allow character strings as input
  • Functions for monitoring non-linear profiles
  • Data sets for the example in the book "Quality Control with R"
  • Some bug fixes
  • Fixed hard-coded axis limits and positions in
  • CRAN policy fixes
  • Fixed NOTES not accepted by CRAN CHECK
  • Function ss.rr now allows one single appraiser
  • Function ss.rr now accepts the sigma level and tolerance. Thanks Kevin C Limburg for suggesting and contributing with the code
  • Adapted DESCRIPTION and NAMESPACE file to CRAN policies
  • Removed welcome messages when loading package
  • Fixed bug on when passing climits argument
  • Fixed roxygen code to allow example(SixSigma) to work
  • New function for control charts (currently supporting moving-range control chart)
  • roxygen2 documentation
  • Updated URL in DESCRIPTION
  • Added compatibility with R-2.14.2
  • Fixed Encoding field in DESCRIPTION
  • Fixed encoding field in DESCRIPTION
  • ggplot2 0.9.2 compatibility implemented
  • Bug fixed in ss.lfa function (thanks to Sanjay Shinde for reporting)
  • ggplot2 0.9.2 compatibility update
  • NEWS file format fixed
  • Code tests implemented (ss.lfa)
  • New dataset (
  • New and updated references in help files
  • Now function ss.lfa (loss function analysis) allows smaller-the-better and larger-the-better CTQs, besides nominal-the-best
  • New datasets (,,,,, for running examples in book "Six Sigma with R".
  • Minor modifications for ggplot2 0.9.0 compatibility
  • Improvements to function: density line, normal qq-plot, warnings when normality test fails
  • Improvements to capability analysis functions (, ss.cp, ss.cpk), warnings and bug corrections
  • New function to compute constant c4 for the unbiased estimator of the standard deviation.
  • New functions and to compute mean and variance of the relative range distribution (R/sigma)
  • New dataframes, and
  • New dataframe
  • Now ss.rr function uses the new functions and to calculate control limits.

Reference manual

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0.9-51 by Emilio L. Cano, 2 months ago

Browse source code at

Authors: Emilio L. Cano, Javier M. Moguerza, Mariano Prieto and Andrés Redchuk

Documentation:   PDF Manual  

GPL (>= 2) license

Imports grDevices, stats, graphics, qcc, lattice, ggplot2, reshape2, nortest, e1071, scales, testthat, xtable

See at CRAN