perry watts, stakana analytics elkins park, pa nate … group...perry watts, stakana analytics...
TRANSCRIPT
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Perry Watts, Stakana Analytics Elkins Park, PA
Nate Derby, Stakana Analytics, Seattle, WA
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The Challenge
Is one that reveals "patterns, differences and uncertainty" in
the underlying data.
2
ButWhat if your data map to crowded displays with overlapping
points, lines, or other obstructions that interfere with pattern
detection?
Framingham Heart Study Overlapping points (n=5,209)
Airlines Data Many overlapping lines (n=6,100)
Barley Data Unreadable response axis (n=120)
Stock Data Untraceable interleaving lines (n=699)
Our Examples are Challenging
An Effective Graph
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Our Approach
3
To
Output that conveys its message more effectively
Along the Way:
Incremental
Go from preliminary graphs that are less than optimal
Point out problems | issues.
Solutions offered take advantage of new features in ODS
statistical graphics and the insights of William S. Cleveland.
Show why GTL must be used instead of a more convenient SG
PROC to produce the graph you are looking at.
We don't spend a lot of time on SAS code, however. Our goal
is to define graphics problems and show how to solve them.
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Framingham Heart Study (sashelp.heart)
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SAS Sample #35172 deals with dense data by using 95%
transparency in the scatter plot, stretching the graph out, and
including marginal histograms.
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Framingham Heart Study (sashelp.heart)
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Code Outline for SAS Sample #35172
PROC TEMPLATE;DEFINE STATGRAPH scatterhist;
BEGINGRAPH / DESIGNWIDTH=600px DESIGNHEIGHT=400px; ENTRYTITLE "Two Continuous Variables";LAYOUT LATTICE / ROWS=2 COLUMNS=2;LAYOUT OVERLAY; HISTOGRAM Xvar; ENDLAYOUT;LAYOUT OVERLAY; ENTRY 'NOBS: ' ...; ENDLAYOUT;LAYOUT OVERLAY; SCATTERPLOT Y=Yvar X=Xvar; ENDLAYOUT;LAYOUT OVERLAY; HISTOGRAM Yvar; ENDLAYOUT;
ENDLAYOUT; /*LATTICE*/ ENDGRAPH; /*END GRAPH BLOCK*/
END; /*END DEFINE BLOCK*/RUN;
PROC SGRENDER DATA=sashelp.heart TEMPLATE=scatterhist;RUN;
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Framingham Heart Study (sashelp.heart)
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Why PROC SGPANEL Doesn't Work
LAYOUT LATTICE / ROWS=2 COLUMNS=2 ROWWEIGHTS=(.2 .8) COLUMNWEIGHTS=(.8 .2);
Panels must have equal dimensions in PROC SGPANEL
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Framingham Heart Study (sashelp.heart)
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What's missing from the definition for NOBS?
LAYOUT OVERLAY / BORDER=true; ENTRY 'NOBS: ' EVAL(N(xvar)) / ...;
ENDLAYOUT;
In a scatter plot each point references an X and a Y coordinate.
(Neither can be missing).
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Framingham Heart Study (sashelp.heart)
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Changing the code gives the right answer
LAYOUT OVERLAY / BORDER=true; ENTRY 'NOBS: ' EVAL(N(xvar + yvar)) / ...;
ENDLAYOUT;
The '+' operator works, because a missing value is returned
when at least XVAR or YVAR is missing. (SUM won't work).
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Framingham Heart Study (sashelp.heart)
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From William S. Cleveland :"make the data rectangle slightly smaller than the scale-line rectangle".
11%14.5%
ODS Statistical Graphics Axis Format
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Framingham Heart Study (sashelp.heart)
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Data points can't appear above the axis maximum tick value.
11%
14.5%
Conventional SAS/GRAPH Axis Format
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The graph is squared off to
eliminate bin-width distortion
due to stretching.
Marginal histogram bin
heights are now comparable,
because VIEWMAX is set to
15%.
Borders are removed to make
marginal histogram bin ranges
more visible.
11
Framingham Heart Study (sashelp.heart)
The Revised Graph: Histogram Fixes
* **
*
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Framingham Heart Study (sashelp.heart)
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We Still Have a Problem with the Scatter Plot
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Framingham Heart Study (sashelp.heart)
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Try Rounding related to Cleveland's Jittering
Jittering adds "random noise" to each point for a slight separation.
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Framingham Heart Study (sashelp.heart)
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Try Rounding related to Cleveland's Jittering
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Framingham Heart Study (sashelp.heart)
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Rounding for a 3rd Dimension based on Frequency
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Framingham Heart Study (sashelp.heart)
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Rounding for a 3rd Dimension based on Frequency
SQUAREFILLED markers in
the scatter plot line up better
with histogram bins.
The legend makes the graph
less square. Compensate by
labeling histogram axes tick
marks.
With solid color plotting
symbols, it is easier to line up
histogram end bins with the
blue data outliers.
* **
*
Continuous legends are only available in GTL
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Framingham Heart Study (sashelp.heart)
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Create a Digitized Contour Plot with PROC KDE
Switch from raw data manipulation ("rounding") to statistical
estimation where cell color is based on probability.
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Framingham Heart Study (sashelp.heart)
An adjusted raw data set is plotted.
X and Y data values are "rounded".
Z, rendered by color, is the count
of tied observations at a given
(rounded) point.
18
Output from PROC KDE is plotted.
The plotting region is divided into
a 60X60 grid of cells in X and Y
variable units (3,600 obs).
Z equals DENSITY not Frequency.
COUNT, another variable, sums to
5,199.
A Rounded vs. Digitized KDE Contour Plot
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Framingham Heart Study (sashelp.heart)
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Generating the Digitized Plot from PROC KDE
proc kde data=sashelp.heart;Bivar Height Weight / PLOTS=NONE out=KDEGridded;
run;
proc sgrender template=xTmp data=KDEGridded(where=(count>0));run;
;
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Framingham Heart Study (sashelp.heart)
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Add the BMI to the Digitized Contour Plot
Complete source code can be found
in the ZIP file referenced in the Paper
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Airlines Data
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A Progression of Time Series Plots
This is a progression of 100 series plots of flights where each
flight has a unique departure date.
The X axis = the number of days before departure a flight is
booked.
The Y axis = the cumulative number of bookings. Each flight
accommodates 180 passengers.
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Airlines Data
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A Progression of Time Series Plots
Is there a Relationship between
Days Before Departure and Departure Date?
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Airlines Data
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A Progression of Time Series Plots
Add a Color Dimension to see the Connection between
Days Before Departure and Departure Dates
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Airlines Data
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A Progression of Time Series Plots
Time Series plots should cumulate left to right. That means the
X-axis needs to be reversed.
An inset replaces the legend, because the legend points to
group variable, Departure Date (100), not Date Range (6).
Inset text maps colors to plot lines. No legend line-to-line
mapping is needed.
What's Different?
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Airlines Data
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A Progression of Time Series Plots
LAYOUT OVERLAY / ... Xaxisopts=(... reverse=true);%do i= 1 %to 6;SERIESPLOT X=x&i Y=y&i / GROUP=ddate
LINEATTRS=(COLOR=&&color&i);%end;LAYOUT GRIDDED / COLUMNS=1 ...; ...;%do j = 1 %to 6;ENTRY TEXTATTRs=(WEIGHT=bold COLOR=&&color&j)"&&Range&j";
%end;ENDLAYOUT; /*gridded*/ENDLAYOUT; /*overlay*/
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Airlines Data
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Using LAYOUT DATAPANEL
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Airlines Data
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Using LAYOUT DATAPANEL
LAYOUT DATAPANEL classvars=(ByDdateLbl)/headerlabelattrs=(weight=bold ...)headerbackgroundcolor=CXBCB9E5columndatarange=unioncolumnaxisopts=(... REVERSE=TRUE)rowaxisopts=( ... );
layout prototype /...;seriesplot x=DaysLeft y=bookings/
group=ddate ...;endlayout; /*prototype*/
endlayout; /*dataPanel */
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Barley Data
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Working with "Multi-Way" Dot Plots
The named inventor, William S. Cleveland, recommends his dot
plot as a replacement for the horizontal bar chart.
The barley data "multi-way" dot plot is famous. R.A. Fisher used
the data to illustrate his ANOVA method of experimental design.
Years later, Cleveland discovers the data error that ANOVA
missed.
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The Barley Data "Multi-Way" Dot Plot
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The Data Error
1931 and 1932 YIELDS are reversed at the MORRIS site
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The Barley Data "Multi-Way" Dot Plot
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From the DOT Statement in PROC SGPANEL
Cleveland supplied the data on STATLIB
proc sgpanel data=barley;title1 "Canadian Barley Production";panelby site;dot variety / response=yield group=year;
run;
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The Barley Data "Multi-Way" Dot Plot
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From the DOT Statement in PROC SGPANEL
Sites are in Minnesota.
Can't see patterns.
SITE and VARIETY are
ordered alphabetically,
not by median.
To re-order, switch from
DOT in SGPANEL to
SCATTERPLOT in GTL.
Plot a 6X1 paneled graph to see the connection between
SITE and YIELD.
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The Barley Data "Multi-Way" Dot Plot
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From the SCATTERPLOT Statement
in GTL
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The Barley Data "Multi-Way" Dot Plot
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GTL CLEVELAND'S Graph
The Elements of Graphing Data
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Stock Data (sashelp.stocks)
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Stock trends are difficult to see in this graph.
Overlaid dashed lines are difficult to track.
Working with Interleaving Time Series Plots
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Stock Data (sashelp.stocks)
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Use the Default Style.
Replace dashed lines with solid ones.
Use different line widths.
Use anti-aliasing to improve resolution.
Working with Interleaving Time Series Plots
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Stock Data (sashelp.stocks)
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Naomi Robbins says to place plot lines into separate panels to
increase visibility. However, lines are then harder to compare.
Working with Interleaving Time Series Plots
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Stock Data (sashelp.stocks)
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Display stocks two at a time to increase comparability.
Working with Interleaving Time Series Plots
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Stock Data (sashelp.stocks)
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Add Band Plots for
emphasis.
Schwartz says the
bands represent the
Area Under the Curve
(AUC).
LIMITLOWER for both
curves is set to $0, but
this creates unwanted
overlay (see arrows).
Working with Interleaving Time Series Plots
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Stock Data (sashelp.stocks)
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Working with Interleaving Time Series Plots
With "interleaved" band plots, the area
between the curves (ABC) is emphasized.
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Summary
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Heart Data: Overlapping Points (n=5,209)
Before After (1)
Color provides a 3rd Dimension for Frequency
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Summary
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Heart Data: Overlapping Points (n=5,209)
Before After (2)
Color provides a 3rd Dimension for Density
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Summary
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Airlines Data: Overlapping Lines (n=6,100)
Before After (1)
Color provides a 4th Dimension for the Departure Date Range
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Summary
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Airlines Data: Overlapping Lines (n=6,100)
Before After (2)
DATAPANEL now provides the 4th Dimension
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Summary
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Barley Data: Overlapping tick labels (n=120)
Before After
Did not work in 9.2 SAS
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Summary
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Stock Data: Interleaving lines (n=699)
Before After
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Contact Information
46
Perry Watts
Stakana Analytics
www.PerryWatts.org
Nate Derby
Stakana Analytics
www.NDerby.org