an exploration of dataviz badpractices - yan holtz · 2020. 4. 19. · an overview of dataviz...
TRANSCRIPT
Anoverviewofdataviz caveats
Anexplorationofdataviz bad practices
Yan-holtz.com/teaching
What’s wrong withthis chart?
Calculation+3D+
Piechart
What’s wrongwith piechart?
What can you see?
What’s wrong withpiechart? It is hardto
distinguish angles
What’s wrongwith 3D
What could be betterhere?
Order your data
Anything wrong here?
Bimodaldistribution
Almost nodata!
Boxplot =hide information
Bimodaldistribution
Almost nodata!
Boxplot =hide information
Ifsmall sample size,add datapointswith jitter
Ifbig sample size,useviolinplot
Showsample size
Showdistribution
Lookatthis chart
What doyou remember?
TheSpaghettichartReadmore
Mind theaspectratioReadmore
Theissuewitherror barsReadmore
Theissuewitherror barsReadmore
Source:FastFedorablog
Size=radius Size=area
Source:FastFedorablog
Size=radius Size=area
Area=poormetaphor
Source: Fox News, via Media Matters for America
Source: Fox News, via Media Matters for America
Obamaadminitration
=2xmore
apprehensions?
“In general, in a time-series, use a baseline that shows the data not the zeropoint” - Edward Tufte
Source: KD Nuggets
Source: KD Nuggets
ReverseYAxis
Donotbecounterintuitive
Data-to-viz.com/caveats
DatatoViz
Acollectionofdataviz caveats
Thanks
Yan-holtz/teachingSlides:
Data-to-viz.comDatatoviz:
www.yan-holtz.com
@R_Graph_Gallery
github.com/holtzy