An exploration of dataviz badpractices - Yan Holtz · 2020. 4. 19. · An overview of dataviz...

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:

Yan.holtz.data@gmail.com

www.yan-holtz.com

@R_Graph_Gallery

github.com/holtzy