using charts to present statistical data to non-statisticians
TRANSCRIPT
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Using Charts to Present Your Results to Non-Statisticians
Often the most effective way to describe, explore, and summarize a set of numbers…—even a very large set—is to look at pictures of those numbers. -Edward Tufte
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Say It With Charts
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Say It With Statistical Charts
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Which Chart Tells the Best Story?
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Chart Junk
Graphical excellence gives the viewer the greatest number of ideas in the shortest time with the least ink in the smallest space.-Edward Tufte
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Cute or Clear?
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What Does a p-value Look Like?
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What Does a p-value Look Like?
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What Does a p-value Look Like?
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Complexity
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Clarity
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What’s Important?
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Pareto Charts Can Tell You
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Is This Acceptable Performance?
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No! You Need Statistical Alarms
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Statistical Process Controlin a Nutshell
Reality: Every Process VariesGoal: Reduce Variation in Products and Services
Types of Variation•Special Cause Variation(something changed)
•Common Cause Variation(normal variation)
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SPC in a NutshellIt’s possible to calculate statistical limits for any type of data and any pattern of variation.
Using these “control” limits, it’s possible to create rules to detect special causes of variation whenever a process shifts.
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Statistics or Charts?
• Normality?•Means?• Variances?
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Reducing Variation
Before After
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Reducing VariationUse Histograms to show reduction in variation
Before After
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http://www.visual-literacy.org/periodic_table/periodic_table.html
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Periodic Table of Visual Methods
http://www.visual-literacy.org/periodic_table/periodic_table.html
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QI Macros SPC Software for Excel
www.qimacros.com
Data Analysis & Projects
Lean Six Sigma Demystified
www.lssyb.com