Control chart analyzer

Skill a5c-ai/babysitter/library/specializations/domains/business/operations/skills/control-chart-analyzer

Statistical process control chart creation and analysis skill with control limit calculation and special cause detectionFrom its SKILL.md

Install

npx -y skills add a5c-ai/babysitter --skill control-chart-analyzer

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SKILL.md

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Control Chart Analyzer

Overview

The Control Chart Analyzer skill provides comprehensive capabilities for creating and analyzing statistical process control charts. It supports multiple chart types, control limit calculation, and automated detection of special cause variation using industry-standard rules.

Capabilities

X-bar and R chart creation
Individual and Moving Range (I-MR) charts
p-chart and np-chart generation
c-chart and u-chart analysis
Control limit calculation
Nelson rules application
Western Electric rules detection
Out-of-control signal alerting

Used By Processes

SIX-002: Statistical Process Control Implementation
SIX-003: Process Capability Analysis
QMS-003: Quality Audit Management

Tools and Libraries

Minitab API
JMP
Python scipy/statsmodels
R quality packages

Usage

skill: control-chart-analyzer
inputs:
  data_type: "continuous"  # continuous | attribute
  chart_type: "xbar_r"  # xbar_r | xbar_s | imr | p | np | c | u
  subgroup_size: 5
  data:
    - subgroup: [10.2, 10.1, 10.3, 10.0, 10.2]
    - subgroup: [10.4, 10.3, 10.2, 10.5, 10.3]
  specification_limits:
    usl: 10.8
    lsl: 9.2
    target: 10.0
outputs:
  - control_chart
  - control_limits
  - out_of_control_signals
  - rule_violations
  - recommendations

Chart Selection Guide

Data Type	Subgroup Size	Recommended Chart
Continuous	1	I-MR
Continuous	2-10	X-bar & R
Continuous	>10	X-bar & S
Attribute (defectives)	Variable	p-chart
Attribute (defectives)	Constant	np-chart
Attribute (defects)	Variable area	u-chart
Attribute (defects)	Constant area	c-chart

Western Electric Rules

One point beyond 3 sigma
Two of three consecutive points beyond 2 sigma (same side)
Four of five consecutive points beyond 1 sigma (same side)
Eight consecutive points on one side of center line

Nelson Rules

One point beyond Zone A (3 sigma)
Nine points in a row on same side of center line
Six points in a row, all increasing or decreasing
Fourteen points in a row, alternating up and down
Two of three points in Zone A or beyond (same side)
Four of five points in Zone B or beyond (same side)
Fifteen points in a row in Zone C
Eight points in a row on both sides with none in Zone C

Integration Points

Manufacturing Execution Systems
Quality Management Systems
Real-time data platforms
Alerting systems

What ships with it

Read from the repository

Just SKILL.md. No reference files, no scripts.