How to Choose the Right Six Sigma Chart

How To Choose The Right Six Sigma Chart
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Jay Arthur
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KnowWare International, Inc.
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We work with companies
that want to fire up their profits using
Lean Six Sigma

There are so many different kinds of charts used in Six Sigma and SPC. How do you decide which one to choose? One of our customers asked for a "cheat sheet" so here it is.

If your data is organized by...	And your data looks like this in Excel...	Choose one of these charts...
Category (e.g., type of defect, city, state, country, male/female, etc.)	Headings + Integers or Decimals:	Pareto Chart Bar Chart
Cause and effect (e.g., calories vs weight gained, variation vs warranty claims, etc.)	Two columns/rows of numbers:	Scatter Chart Matrix Plot
Time Attribute Data (days, hours, batch number, lot number, etc.)	One column of Integers	c Chart
Time Attribute Data (Counted)	Headers (time, lot number) 1. Defects (Integer) 2. Sample size (contant integer)	np Chart
Time Attribute Data (Counted)	Headers 1. Defective items (Integer) 2. Sample size (variable integer)	p Chart
Time Attribute Data (Counted)	Headers 1. Defects (Integer) 2. Sample size (variable integer)	u Chart
Time Variable Data (Measured)	Headers (time, lot number) 1. Decimals	XmR Chart Histogram
Time Variable Data (Measured)	Headers (time, lot number) 2-5 columns of Decimals	XbarR Chart XMedianR Histogram
Time Variable Data (Measured)	Headers (time, lot number) 5-25 columns of Decimals	XBarS Chart Histogram

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