This week’s DataViz on twitter

This was a great week on twitter for a RNA-scientist moonlighting as data visualization expert. There are a couple of mantras that I keep on repeating and they all came up this week.

1) In praise of drawings!

A simple drawing is better than a complicated diagram. And these days, it is super simple to draw on the ipad – even unskilled artists can go a long way! Or use whiteboard and include this as a picture in your talk.

This is a wonderful drawing of expansion microscopy by Christophe Leterrrier (@christlet):

Screen Shot 2016-06-03 at 11.32.01

2) Avoid 3D!

Unless you are making an interactive web-based animation, 3D is very hard to read and way too often results in confusion or even misleads the reader! Avoid it at all costs. See my recent blog-post on one possible work-around. Here is a recent example that circulated in the RNA-twitterverse by RNAseqblog about usage of RNAseq.

Screen Shot 2016-06-03 at 11.45.41

3) Time = line.

If you want to show changes over time, the time almost always goes to the x-axis! A line graph works best if you have many time-points. When dealing with only two time-points like in this case the go-to chart is the slope-chart!

Screen Shot 2016-06-03 at 11.31.40

Solution: turn bars into lines, shift 90deg and simplify by using colors strategically and finally, make straightforward labels! PS I hope Dan Graur does not mind me using his graph as an example 🙂  slope_dangraur

4) Faceting is always a solution.

If you can’t solve a problematic graph, try faceting aka small multiples aka many little similar graphs. I used it for example here. Faceting is really easy for people using R, but it is, like so many things, also possible in excel. I am not an evangelist for either, both have their value, – it is most important that you try making better graphs regardless of the program you use to create them! Have a look how to do faceting with excel:









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