Analysis of the London pilot showed no correlation between wealth and the take-up of choice, which suggests that choice is not something that can be enjoyed by the middle classes alone.

BBC: NEWS | UK | UK Politics | In full: George Osborne speech

An analysis comparing Wal-Mart Stores' (nyse: WMT - news - people ) same-store sales growth to consumer spending data dating back to January 2004, compiled by the Bureau of Economic Analysis, actually shows a negative correlation between the two.

FORBES: Wizardry At Wal-Mart

Subsequent detailed analysis of the IALS data showed a strong correlation in the United States between parental education and the literacy levels of youth.

UNESCO: II Part Analytic Section

Part of this analysis requires a correlation study to test if the asset class has unique risk.

FORBES: Basics of Asset Allocation (Part 2 of 2)

Whether the criminal "underclass" is an identifiable and stable group may be questionable, but BBC analysis of people charged in relation to the disorder in Manchester does suggest a clear correlation with deprivation.

BBC: England riots: The feast of fools?

This means that the data which shows a negative correlation between stock performance and GDP, has less data in it, and its negative correlation is only roughly 24%, while the analysis which shows a positive correlation between stock returns and GDP has a correlation of 66%.

FORBES: John Mauldin's Muddled Stock Return Model