This is one of my favorites:
One entry per answer. (This is in the vein of the Stack Overflow question What’s your favorite “programmer” cartoon?.)
P.S. Do not hotlink the cartoon without the site's permission please.
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Yes, let's not jump to random forest before we work on some simpler branches!
This one might be useful when introducing the concept of experimental and control groups.
My favorite was created by Emanuel Parzen, appearing in IMA preprint 663, but this illustrates my degenerate sense of humor.
Gorbachev says to Bush: "that's a very nice golfcart, Mr. President. Can it change how statistics is practiced?" etc. hahahah.
"Curve-Fitting Methods and the Messages They Send" by xkcd: https://xkcd.com/2048/
Note: this is from SMBC (Saturday Morning Breakfast Cereal) by Zach Weiner.
A new one from XKCD, suggesting a preference for a particular plot type:
hover text: Strictly speaking, 'violin' refers to the internal structure of the data. The external portion visible in the plot is called the 'viola.'
More of a math cartoon than a data analysis cartoon, but also one that makes you think a bit.
Source: http://www.gocomics.com/andertoons/2014/06/15#.U54J7iigS8A by Mark Anderson, June 15, 2014.
Draw your own data , found it in the below link
[New Year] : http://robertgrantstats.co.uk/drawmydata.html
True if $P=NP$
True if $P \ne NP$
This is great one about solving NP-complete problems. They come up a lot on the job, like efficient scheduling or how to select the optimal configuration among a number of various options for which you have to search through them all to find the best one.
Think about it anytime you need to cop out of something difficult at work!