An Introduction to splatter plots.

1. Splatter plots
Traffic Lights, Targets, and Tolstoy....
A Data Rich Graphic
that is:
• Comprehensive
• Reducible
• Diagnostic
• Visual
• Geometric
• Expandable
• Versatile
• Easy!

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On the road For a Meeting a
in Traffic project: goal:
GO! Success! Certainly
YES!
STOP! Failure! Certainly
NOT!
CAUTION!
HURRY! Unclear! Maybe yes….
PREPARE TO Ambiguous! Maybe not….
STOP! Uncertain!

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A+C)1)/'N+*#-3",&'O,#P0'Q1/3*%'
Consider testing a medical treatment. A good treatment is:
(1) Safe (2) Effective (3) Easy to use (4) Inexpensive
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Easy?? Effective??
Ready!
AIM!
FIRE!
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SCORE! Safe??
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7. A+C)1)/'N+*#-3",&'O"$%*"6'
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“Happy families are all alike;
Each unhappy family is unhappy in it’s own way”
--Leo Tolstoy, Anna Karenina
Unhappy!
Happy!
Unhappy!
Has issues!
At a glance, can see successes
& failures!—And Where!

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Easy to
see
general
areas of
success
and
failure!

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At a glance, can see (1) Overall Success/failure
for each study: (2) Kinds of problems

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Elicited opinions,
Statistical Calculations
• Best Case
/Worst Case
• Hi/Med/Low
Uncertainty
• Best likely
/ Worst Likely
• Optimistic
/ Pessimistic
• Estimates
+ 95% Confidence
Intervals

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Circles and pluses and
X’es, oh my!
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Solid Red! STOP Red Circle ! Would stop, if it mattered
Solid Amber! CAUTION Amber Circle ! Don’t know, don’t care??
Sold Green ! GO Green Circle ! Possible GO, w/Caveats

14. 93#)/+'"<']+,%-+0B:+'
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Epidemiology
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'''
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'''⇒'EPIDEMIC'
'
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15. Epidemiology: Age groups & factors'
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3 reds in a zone
! very bad!

16. Splatter plots
Targets, Traffic Lights, and Tolstoy....
Programmed in:
• R
• Excel
Contact:
denswei@gmail.com
'
www.Dennis-Sweitzer.com
'