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Jeff Weir

Thanks for picking up my points.
Sometimes it’s bad to be a chart junky, because our addiction forces us to focus on the merits of the chart as presented. We should make sure that we critique not just a chart but also how else the information might be presented, the pedegree of that information, and alternate sources of information that might add more insight.

There’s been 3 good examples on 3 of my favourite blogs in the last week:
*This example
*A chart at Ajay’s Databison blog over at http://www.databison.com/index.php/volatility-chart-in-excel-lessons-in-chart-design-from-ny-times/
* A chart critiqued in Chandoo’s PHD blog over at http://chandoo.org/wp/2010/01/15/flu-trends-chart-review/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A+PointyHairedDilbert+%28Pointy+Haired+Dilbert%29&utm_content=Google+Reader

In all three cases, the charts look pretty cool. But on deeper reflection, the charts could be made either way more interesting and/or more easily interpretable. And there’s statistical problems with two of those charts that mean it could be dangerous to draw conclusions from them.

Regarding this particular chart, there’s a few great comments on the Times’ site that get to the heart of what I'm saying. My favourite : “How can the Times give so much bandwidth to this?” I agree. To paraphrase Tufte, the data is not the most interesting data.

Another comment reads “This is a strange feature for the Times, with no analysis or context to guide the reader. Would be nice to have some sort of commentary from a sociologist type. The conclusions to be drawn from this are....what?” I couldn’t agree more.

One commenter who's obviously a chart junky said “This is brilliant work”, followed immediately by “I cannot tell what numbers of rentals there are, or how significant a very-light color is. It would be useful to know how many rentals are at the lowest bounds: does one rental in a neighbourhood make it appear, or several? “

So what’s brilliant about it? To my mind, brilliant execution + crap message <> brilliant graphic. If the message is crap, the graphic is crap REGARDLESS of the execution.

On presentation, I’ve seen quite a few comments praising graphics/graphs saying stuff like “The colours fit in with the approach that Tufte/Few/Picasso advocates concerning colours/data ink/scale”. But very often those people miss the big picture: the graphic completely misses the APPROACH that the quoted expert would advocate.

I’m not against creative ways to express data…unless they are not the BEST way to display the data.

Danny Dougherty

The Society for News Design has a good interview with a designer who worked on the piece. He talks not just about process but some of the design trade offs made in putting together the graphic and about the slightly different print version that appeared in the Metro section of the NYT: http://www.snd.org/2010/01/nyt-netflix-graphic/

Jeff Weir

Stephen Few has a great post at http://www.perceptualedge.com/blog/?p=672 on accessing the effectiveness of a new dashboard's design. Many points are applicable not just to dashboards but to stand-alone graphics...certainly if graph/graphic designers followed the "Specific Parts of the Dashboard" part then we'd have much more meaningful graphs.

Jeffrey Weir

Thanks for the link, Danny.

I see that it was Netflix that withheld the "number of people renting" metric in favour of "rank" for commercial reasons. Fair enough, then. Still, this didn't preclude the designer from looking at the relationship between Metacritic scores and Netflix ranks. Or looking at how closely correlated the top 50 lists were between zip codes Although this would probably be beyond the scope of the NYT...it takes a lot more number crunching, and ultimately their mission is to provide fodder for the eyeballs of the masses.

I see that they ran a full-page graphic in print that had more statistical analysis. I’d be interested to see this.

Another thing I ponder on about this graphic is why you would need an ‘Alphabetical’ filter. Alphabetically makes no sense unless you want to find a particular movie by title rather than by popularity or metascore. But in that case, it would be easier if a user could select the movie title they are after directly from a dropdown list, rather than select the ‘Alphabetical’ filter and then move the slider to find the title they are searching for.

Peter Holmdahl

I'm looking for (to read tomorrow or before :) something about visualizing/comparing matrices. They could be for instance a month where each day have 5 values (date is one dimension, location is the second, and the actual value is the third). And I want to compare the values of 2-5 of these.
Any reading tips anyone? :)


You should consider a "heat map", sometimes called a "cell plot". Imagine a grid of squares, each square correspond to a given (date, location) pair. You just pick colors according to the third value. This is a great pattern recognition tool. Put several of these side by side and you can tell the patterns easily, if they exist.

Peter Holmdahl

Thanks Kaiser! Yeah, heat maps are nice, but kinda hard to compare value-to-value between two or more matrices, I think.

curtis johnson realty

This is a very interesting post. I have to say that focusing on the rental business must have a exact info and background pertaining to it. I really appreciate the effort of posting it so that many will be inspired and can get useful information about rentals. More power.

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