Mode, plurality, and “the most popular way”

I recently stumbled across this headline from Stanford News: “Meeting online has become the most popular way U.S. couples connect, Stanford sociologist finds.” Would the average reader assume this means that more than 50% of couples meet online?

This is not what the headline or the story says. More details from the story:

Rosenfeld, a lead author on the research and a professor of sociology in the School of Humanities and Sciences, drew on a nationally representative 2017 survey of American adults and found that about 39 percent of heterosexual couples reported meeting their partner online, compared to 22 percent in 2009.

It appears 39% of couples meet online. According to the summary of the paper, the others ways couples meet are:

Traditional ways of meeting partners (through family, in church, in the neighborhood) have all been declining since World War II.

The 39% figure meets the definition of both the mode and a plurality, respectively (both definitions from Google):

the value that occurs most frequently in a given set of data.

the number of votes cast for a candidate who receives more than any other but does not receive an absolute majority.

Still, I suspect there might be some confusion. Online dating brings more Americans together than any other method but it is only responsible for a little less than forty percent of couples.

Graphing changing household arrangements from 1960 to 2017

An article discussing changes in American household arrangements includes this graph:


A summary of the data:

It all represents an increasing distance from the nuclear-family structure considered traditional for decades. The changes solidify shifts that have been mounting since then, erasing the notion of one dominant family type. In the early 1960s, two-thirds of children were raised in male-breadwinner, married-couple families. By contrast, today there is no one family-and-work arrangement that encompasses the majority of children, demographers say.

“That dominant model declined, but it’s not like it was replaced by one thing,” says Philip Cohen, professor of sociology at the University of Maryland. “It was replaced by a peacock’s tail, a plethora of different arrangements.”

The graph is most effective at showing the biggest change: the decline of the “mother-father married, father only earner” group over nearly six decades. Two other categories have significant increases – married and dual earners, single mother – while the five categories at the bottom involve relatively fewer households.

The graph is unusually skinny from left to right and this helps emphasize the straight lines up or down over time. Would a wider x-axis show some more variation over time or are the trends always pretty consistent?

The colors are a little hard to distinguish. I am not usually in favor of dotted lines and so on but this might be an opportunity to differentiate between trend lines.

Just thinking about other graph options, a pie chart for each time period might also communicate the big change well (though the smaller categories might not show up as well) or a clustered bar graph with the two years side to side could show the relative changes for each group.

In sum, graphing significant social change is not necessarily easy and this format clearly communicates a big change.