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Eric Ast

Great breakdown of the art of visualization. It's nice to see a results-focused breakdown of what function charts should provide. I was hoping that the links on self-sufficiency and data labels would bring me to a separate post or a glossary with a little more info about those terms, but it just links to the main blog. Do you have a resource or a separate take on those?

Thanks,

Eric

Omegatron

To me, it seems like the stacked bars are a more accurate representation of the data. The point she's getting across is "it hasn't changed much", which is obviously true. With the other graphs, you can't see how small the change is relative to the whole.

Trying to magnify tiny differences seems like something someone would use when they're intentionally trying to be misleading about the numbers.

Also, what's the margin of error?

Kaiser

Eric: Sufficiency is a topic that I discuss here quite a bit - how much does a chart depend on having all the data printed on it? Try imagining the chart without the data labels. Here's an old post about this topic that hasn't been tagged properly.

Omegatron: what the final chart shows is that the number of married couples in which only the wife works has grown 40% over this period while the total number of married couples has barely grown. I don't think any more sophisticated test is needed to see that the growth is important.
A different way to see this is to notice that between 2001-2008, the proportion of married couples with only the wife working was very stable at between 7.1%-8.2%, a range of about 1%, while the jump from 2008 to 2009 was almost 2% (from 8.2% to 9.9%). In absolute scale, a jump of 2% may be not noticeable but statistically, it is remarkable because the historical variation is so low.


Jon Peltier

The unstacked line chart is a large improvement over the stacked column chart.

I think the last chart is misleading. The total number of families is (nominally) fixed, so it's a zero sum game. If a family moves from "both working" to "wife only", there should really be the same change in both curves (except for sign). The normalized chart shows a jump in "wife only" of about six times that of "both working".

Kaiser

Jon: I'm not sure I understand what you mean by "nominally fixed". There is population growth over time so the number of married couples must be increasing. (The index is such that for each category, the 2001 value is fixed at 100. It's not a double index.) I agree that both versions will effectively show the same thing - it's the same data after all, it's the anchor point which differs.
Since we agree that the jump for wife only is drastic, a chart that brings this message out should be appropriately drastic!

Tom West

The message seems to be that households are switchign from "both" to "wife-only".

Jon Peltier

Kaiser: The population growth is not as pronounced as the change in job status, and in any case this is normalized in both charts.

But in the first line chart, you are tracking percent of the total, so a loss of X percent in one category has to be made up by a total gain of X percent in the other categories. You are tracking differences, so the change is linearly the same.

In the last line chart, you are tracking ratios. A loss of X% of 50% (both) results in a gain of X% of 10% (wife only), so the 'wife only' curve shows 5 times the amount of change. The additive nature of the data is obscured.

Patrick Leunissen

Jon: I agree with you and I think with the "index" chart a suitable chart title is neccessary. You visually suggest that the wife only is the biggest group. People tend to read a graph like this and jump to conclusions.
For this type of data a combination of (small) charts works better in my opinion. One for the size of the group and one for change.

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