In 2008, economists Justin Wolfers and Betsey Stevenson, both of the University of Pennsylvania, published a paper where they reassessed the Easterlin paradox using new time-series data.

FORBES: Jeff Sachs and the Economics of Happiness

OECD's and the Conference Board's current historical time series differ from what was published at the time, because the data from which they are constructed have been revised.

ECONOMIST: Leading economic indicators

Intel stated in a press release that it has identified a flaw in its series 6 chipsets in which the ports can degrade over time and lead to data access issues for customers.

FORBES: Intel's Chip Error Should Not Concern Investors

Mr. FELCH: Well, the big takeaway from our series - and after, you know, spending a lot of time analyzing this data - is that individual teachers really matter.

NPR: 'L.A. Times' Series Examines Teacher Ratings

And, like all such data, this series comes in with a lag, is revised over time and tends to miss turning points.

FORBES: Are There Too Many Homes in America, Ctd