Values are the most predictive, and values cannot be measured like GDP.

FORBES: Do the Chinese Envy America? IMF Forecasts, Purchasing Power Parities -- and Chuck Colson

IPOs has always been strongly correlated with market peaks, measured by the ratio of capitalisation to the book values of companies and by price-earnings ratios.

ECONOMIST: IPOs are making a comeback

The city they moved to in southern Florida, where they started their family, fell into the lower half of the country in terms of prosperity, measured by the income of its residents and home values.

NPR: Weak Housing Market May Not Be Signal to Buy

Boe allows output of oil, measured in barrels, and gas, measured by its volume, to be added together to form one figure and measures production volumes rather than values. (Further explanation about boe can be found here).

FORBES: Oil Extraction in The Amazon Rainforest: HRT Expects Daily Production Of 50,000 Barrels Of Oil in The Solim?es Basin by 2014

Denis is a man of deep faith, and he understands that in the end, our policies and our programs are measured in the concrete differences that they make in the lives of our fellow human beings and in the values that we advance as Americans.

WHITEHOUSE: Remarks by the President at a Personnel Announcement