Analysis Hub Configuration
Stepped vs. Straight Limits
Because P-Charts and U-Charts handle subgroups with varying sample sizes (n), statistical rules require the limits (UCL/LCL) to recalculate for every single point—creating a stepped line.
Smaller samples have wider limits; larger samples have tighter limits.
Why both? For clarity, we plot the exact Stepped Limits for precision, AND an "Average Limit" (straight line based on the mean sample size) to help easily visualize the trend!
Smaller samples have wider limits; larger samples have tighter limits.
Why both? For clarity, we plot the exact Stepped Limits for precision, AND an "Average Limit" (straight line based on the mean sample size) to help easily visualize the trend!
Sample Count (k):
Paste from Excel/CSV
Process Visualization
Industry Scenario
Metrics & Knowledge Base
Statistical Verdict
SPC Concepts & CAPA Guide
Key Statistical Terms
CAPA Execution Steps (If Out of Control)
- Containment: Stop the line. Quarantine the suspect batch immediately to prevent it from moving forward in the process.
- Root Cause Analysis (RCA): Investigate the true cause of the variation using methods like 5 Whys or Fishbone Diagrams.
- Corrective Action: Fix the immediate problem directly identified by the RCA (e.g., replace the worn tool).
- Preventive Action: Implement a systemic change to prevent recurrence (e.g., update the maintenance schedule).
- Verification: Monitor the SPC chart for the next 5-10 batches to mathematically prove the process has returned within the Control Limits.
Data Records
Computation Ledger