Easily see if your process is meeting customer specifications with SPC for Excel's process capability techniques for normally and non-normally distributed data:

Normal Process Capability SnapShot

snapshot

  • Consists of Cpk chart, control chart (either X-R, X-s or X-mR), normal probability plot and select statistics
  • Cpk chart: contains many of the options listed below
  • Select Out of Control Tests for control chart
  • Includes Anderson-Darling statistic and p value for normal probability plot
  • Select statistics included at bottom of page

Non-Normal Process Capability SnapShot

non-normal snapshot

  • Consists of Ppk chart, control chart (either X-R, X-s or Non-Normal  X-mR), P-P plot to test the fit of the distribution and statistics
  • Ppk chart: contains many of the options listed below
  • Select out of control tests for control chart
  • Includes Anderson-Darling statistic and p value for the P-P plot
  • Select statistics included at bottom of page

Normal Process Capability (Cpk/Ppk)

cpk

  • Histogram
  • Lower specification limit, nominal (if entered), upper specification limit (only one specification is required as the software handles one-sided specifications)
  • Normal curve based on estimated sigma and/or calculated standard deviation
  • +/- 3 sigma limits based on estimated sigma and/or calculated standard deviation
  • Plot average
  • Shade/unshade histogram option
  • Confidence limits for Cpk and Ppk
  • For subgroups, base estimate of sigma on average range, average standard deviation or pooled variance
  • Output Statistics Options:
    • Within Process Capability (based on estimated sigma)
      • Cp, Cpk, Cpu, Cpl
      • Estimated Sigma (from range or standard deviation chart)
      • PPM > USL
      • PPM < LSL
      • Total PPM out of specification
      • Sigma level
      • Subgroup Size
    • Overall Process Capability (based on calculated standard deviation)
      • Pp, Ppk, Ppu, Ppl
      • Calculated Sigma
      • PPM > USL
      • PPM < LSL
      • Total PPM out of specification
      • Sigma level
    • General Statistics
      • Average
      • Count
      • Number out of specification
      • Minimum
      • Maximum
  • Add target (to calculate Cpm)
  • Option to remove outliers
  • Option to use historical average and standard deviation in the calculations
  • Option to transform the data with Box-Cox or Johnson transformations
  • Add dates of data collection
  • Change the number of classes, the class width or the starting point on the histogram
  • Easily update with new data
  • Process capability table to summarize all process capability charts in a workbook

Non-Normal Process Capability (Ppk)

non ppk

  • Histogram
  • Lower specification limit, nominal (if entered), upper specification limit (only one specification is required as the software handles one-sided specifications)
  • Select one of 13 distributions for the analysis:
    • Exponential
    • Exponential - Two Parameter
    • Gamma
    • Gamma - Three Parameter
    • Largest Extreme Value
    • Logistic
    • LogLogistic
    • LogLogistic - Three Parameter
    • LogNormal
    • LogNormal - Three Parameter
    • Normal
    • Smallest Extreme Value
    • Weibull
    • Weibull - Three Parameter
  • Option to enter the parameters for the distribution or have SPC for Excel find the best-fit parameters
  • Option to plot average
  • Option to shade the histogram
  • Add dates of data collection
  • Add titles and axis labels
  • Add target to calculate Cpm
  • Change the number of classes, the class width or the starting point on the histogram
  • Easily update with new data
  • Process capability table to summarize all process capability charts in a workbook

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