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  2. SigmaStat - Wikipedia

    en.wikipedia.org/wiki/SigmaStat

    SigmaStat is a statistical software package, which was originally developed by Jandel Scientific Software in the 1980s. As of October 1996, Systat Software is now based in San Jose, California.

  3. List of Six Sigma software packages - Wikipedia

    en.wikipedia.org/wiki/List_of_Six_Sigma_software...

    There are generally four classes of software used to support the Six Sigma process improvement protocol: Analysis tools, which are used to perform statistical or process analysis; Program management tools, used to manage and track a corporation's entire Six Sigma program; DMAIC and Lean online project collaboration tools for local and global teams;

  4. SigmaPlot - Wikipedia

    en.wikipedia.org/wiki/SigmaPlot

    SigmaPlot is a proprietary software package for scientific graphing and data analysis.It runs on Microsoft Windows. [1]The software can read multiple formats, such as Microsoft Excel spreadsheets, and can also perform mathematical transforms and statistical analyses.

  5. RealMagic - Wikipedia

    en.wikipedia.org/wiki/RealMagic

    The Sigma Designs RealMagic ISA MPEG decoder card RealMagic (or ReelMagic ), from Sigma Designs , was one of the first fully compliant MPEG playback boards on the market in the mid-1990s. RealMagic is a hardware-accelerated MPEG decoder that mixes its video stream into a computer video card 's output through the video card's feature connector .

  6. 68–95–99.7 rule - Wikipedia

    en.wikipedia.org/wiki/68–95–99.7_rule

    In the empirical sciences, the so-called three-sigma rule of thumb (or 3 σ rule) expresses a conventional heuristic that nearly all values are taken to lie within three standard deviations of the mean, and thus it is empirically useful to treat 99.7% probability as near certainty.

  7. Experimental uncertainty analysis - Wikipedia

    en.wikipedia.org/wiki/Experimental_uncertainty...

    The interesting issue with random fluctuations is the variance. The positive square root of the variance is defined to be the standard deviation, and it is a measure of the width of the PDF; there are other measures, but the standard deviation, symbolized by the Greek letter σ "sigma," is by far the most

  8. Pauli matrices - Wikipedia

    en.wikipedia.org/wiki/Pauli_matrices

    All three of the Pauli matrices can be compacted into a single expression: = (+), where the solution to i 2 = −1 is the "imaginary unit", and δ jk is the Kronecker delta, which equals +1 if j = k and 0 otherwise.

  9. Sigma-pi and equivalent-orbital models - Wikipedia

    en.wikipedia.org/wiki/Sigma-pi_and_equivalent...

    Erich Hückel proposed a representation of the double bond as a combination of a sigma bond plus a pi bond. [ 7 ] [ 8 ] [ 9 ] The σ-π representation is the better-known one, and it is the one found in most textbooks since the late-20th century.