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The Numbers



The Wall Street Journal examines the way numbers are used, and abused.



Last Build Date: Mon, 03 Jul 2017 13:00:43 +0000

Copyright: copyright © 2017 Dow Jones & Company, Inc.
 



A Note to Readers

Mon, 03 Jul 2017 13:00:43 +0000

Dear readers, The Numbers blog will no longer be updated as of July 2017. We will continue to look at the use of numbers in news, business and politics in our weekly column, and you can follow us on Twitter for the latest updates. Additionally, you can download the WSJ app for iOS or Android to follow Jo Craven McGinty and all […]



Retirement Calculators, Assumptions and Statistical Methods

Fri, 22 Jul 2016 18:16:40 +0000

Retirement calculators employ different assumptions to help users predict whether their rate of savings will support their current lifestyle after they quit work.


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Boomers, Gen Xers and Millennials: Catchall Groupings

Fri, 15 Jul 2016 18:02:27 +0000

Generational groupings are attractive to academics who want to measure social and cultural change. They’re coveted by marketers looking to capitalize on evolving consumer tastes. And they appeal to others seeking to exploit the perceived psyche of the different groups.


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Economists’ Enemy: Residual Seasonality

Fri, 01 Jul 2016 20:33:42 +0000

When seasonally adjusted numbers continue to exhibit the influences of seasonal effects, much as first-quarter readings on gross domestic product have regularly been doing, statisticians refer to it as residual seasonality. And that effect hampers seasoned economists from making clear-eyed judgments on the strength of the economy.


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How Math Helps Fight Epidemics Like Zika

Fri, 03 Jun 2016 17:19:28 +0000

When an epidemic such as Zika threatens to sweep across the country, public-health workers and policy makers need some basic information in order to plan a strategic response to make the best use of limited resources to protect the public from the spread of the disease. Enter the mathematicians and statisticians.


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Joe DiMaggio’s Streak (Predictably) Survives

Fri, 27 May 2016 18:00:06 +0000

Jackie Bradley Jr.'s bid to supplant Joe DiMaggio atop the Major League Baseball hit-streak list ended at 29 games. That's not surprising as many observers consider Joltin' Joe's streak the most difficult record to break in sports.


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Behind The Numbers: Beating DiMaggio’s Streak From the Armchair

Fri, 13 May 2016 17:06:52 +0000

MLB.com really wants to give away $5.6 million. But there’s a catch: To claim the prize, one needs to participate in Major League Baseball’s Beat the Streak contest and assemble a batting streak that surpasses Joe DiMaggio’s run of 56 consecutive games in 1941. This isn't easy.


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Why Some Cicadas Have Reason to Brood: Potential Extinction

Fri, 06 May 2016 16:10:37 +0000

​Periodical cicadas live underground for 13 or 17 years before emerging to mate, lay eggs and die off, and today, there are 15 known broods in the U.S. There used to be 16 and the current number may dwindle if the teetering Brood VII goes extinct.


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Facetime With Uncle Sam

Fri, 22 Apr 2016 17:11:52 +0000

A number of government surveys are conducted in face-to-face interviews for a variety of reasons. Sometimes, physical material must be collected or the survey is too long and complex to conduct by telephone or mailed questionnaire. The results are some of the richest and most complete survey data available.


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The Challenging Calculus of Figuring Out Who Gets to Vote

Fri, 15 Apr 2016 16:01:30 +0000

The litigants in a recent Supreme Court case suggested using the American Community Survey, an annual sample of 2.5% of U.S. households that asks about citizenship, to estimate the citizen voter-age population.


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