Using Charts to Present Statistical Data to Non-Statisticians

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

Say It With Charts

Say It With Statistical Charts

Which Chart Tells the Best Story?

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

Cute or Clear?

What Does a p-value Look Like?

What Does a p-value Look Like?

What Does a p-value Look Like?

Complexity

Clarity

What’s Important?

Pareto Charts Can Tell You

Is This Acceptable Performance?

No! You Need Statistical Alarms

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)

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.

Statistics or Charts?

• Normality?•Means?• Variances?

Reducing Variation

Before After

Reducing VariationUse Histograms to show reduction in variation

Before After

http://www.visual-literacy.org/periodic_table/periodic_table.html

Periodic Table of Visual Methods

http://www.visual-literacy.org/periodic_table/periodic_table.html

QI Macros SPC Software for Excel

www.qimacros.com

Data Analysis & Projects

Lean Six Sigma Demystified

www.lssyb.com