Prolink Software Knowledge Base

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Knowledge Base Article
 SPC Overview
  An overview of Statistical Process Control concepts and definitions
 Why is -99999 showing in my Office Buddy or ERS reports?
  What to do if a value of -999999 shows up in SPC Office Buddy or ERS
 Calculating Sigma and Sigma Within
  This article discusses how the different Sigma values are calculated.
 Calculating Limits in QC-CALC
  How and where QC-CALC calculates control and spec limits
 What does Cpk mean?
  An explanation of Cpk and what it means
 Why do my calculations in QC-CALC differ from those in Minitab?
  This article gives a couple of reasons for different values between QC-CALC and Minitab.
 How is Cpk Calculated on Single Sided Dimensions
  Cpk formulas used by QC-CALC
 Sigma Control Charts - Samples or Populations?
  This article explains the different Sigma calculations that are used.
 How is Cpk calculated for single-sided tolerances
  This white paper gives an overview of the single-sided calculation
 General SPC Overview
  An overview of Statistical Process Control concepts and definitions
 Test of normality “Confidence” Explained
  This article explains how the Test of Normality is calculated in QC-CALC SPC and ERS.
 Is it possible to do a Cmk calculation based on a shifted process?
  Displaying Cmk values in QC-CALC
 Cpk vs. Ppk Explained
  This article explains the history and differences between the Cpk and Ppk calculations
 How Sigma / Standard Deviation is Calculated in QC-CALC
  Methods used by QC-CALC to calculate sigma or standard deviation
 Cpk Value differs between QC-CALC and Stat Package
  This article explains the different Cpk standards available.
 QC-CALC's CPK is different than my manual calculation
  Troubleshooting CPK values in QC-CALC