How To Fix QE428 - Standard deviation is set at 0

SAP Error Message - Details

• Message type: E = Error

• Message class: QE - RM-QSS Fehlertexte zur Ergebniserfassung

• Message number: 428

• Message text: Standard deviation is set at 0

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message QE428 - Standard deviation is set at 0 ?

  The SAP error message QE428, which states "Standard deviation is set at 0," typically occurs in the context of quality management (QM) when dealing with inspection characteristics. This error indicates that the system has encountered a situation where the standard deviation for a particular characteristic is set to zero, which is not valid for statistical calculations.
  Cause:
  
  Data Entry Error: The standard deviation may have been incorrectly entered as zero during the setup of inspection characteristics.
  Lack of Variability: If there are no measurements or if all measurements are identical, the calculated standard deviation will be zero.
  Configuration Issues: There may be issues in the configuration of the quality management module or the specific inspection plan.
  
  Solution:
  
  Check Inspection Characteristics: Review the inspection characteristics in the inspection plan to ensure that the standard deviation is set correctly. If it is set to zero, update it with a valid value.
  Review Measurement Data: Ensure that there are sufficient and varied measurement data points for the characteristic in question. If all measurements are the same, consider taking additional measurements to introduce variability.
  Adjust Calculation Settings: If applicable, check the settings for how standard deviation is calculated in the system. Ensure that the calculation method is appropriate for the data being analyzed.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling standard deviation settings in the context of your version of SAP.
  Contact Support: If the issue persists, consider reaching out to SAP support or your internal IT team for further assistance.
  
  Related Information:
  
  Quality Management Module: Understanding the QM module in SAP can help in troubleshooting issues related to inspection plans and characteristics.
  Statistical Process Control (SPC): Familiarity with SPC concepts can provide insights into why a standard deviation of zero is problematic and how to interpret variability in data.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  
  By addressing the root cause of the zero standard deviation, you can resolve the QE428 error and ensure that your quality management processes function correctly.