In that condition the correlation was zero.

We call this Mission Zero.

So, their fortunes add up to zero.

I'd suppose that it's zero or practically zero.

Zero price means zero weight in the GDP statistics.

The correlation between IQ scores and grades is about .50.

Of course, a good hedge lasts only as long as such correlations persist.

So that's the first reason zero tolerance policies and the way they're lived out.

There was a very nice correlation between love of Lego and the amount of Legos people built.

And this is perhaps the most important facet we have found Mission Zero to be incredibly good for business.

But this correlation goes missing when one looks at the dimension of time rather than space.

The zero duty rate will be in place until the end of 2014, and the possibility of its extension, as well as an extension of the subsidy list, are being worked out.

Finally, the widely assumed correlation between monetary policy and currency values does not stand up to empirical examination.

That has been the story for the last 20 years in Japan, owing to persistent deflation and near zero interest rates on many assets.

So the relationship is liable to go wrong at the worst possible time when a hedge would be most useful, the asset you were relying on becomes a risk.

Investment strategies such as this must be entered into with caution simply assuming that a past correlation will persist is never a good idea. But currency values are driven by macroeconomic developments, and therefore FX does offer natural hedging opportunities in liquid and transparent markets.

True, with only 16 countries rich enough to be included in the survey, the correlation isn't perfect.

The positive correlation between income and democracy that one sees across countries could be due to reverse causation democracy is more likely to persist as a country grows richer.

I did not have a magic algorithm relating economic factors to voting intentions though I do think that there is some correlation between net disposable income and how people normally vote.

The zero bound on short_term rates does represent an important constraint on what monetary stabilization can achieve, but it is a more modest barrier than deflation pessimists insist.

In fact, the Fed has been under increasing scrutiny since 2008, when near zero nominal interest rates drove it to become the first central bank to adopt QE.

Wrong.

Those with large amounts of reserves know that holding dollars is a bad deal no or low return and a high risk of inflation or currency depreciation, either of which would diminish their holdings real value.

So like in tennis, usually it's win lose it always adds up to zero zero sum. But if you're playing doubles, the person on your side of the net, they're in the same boat as you, so you're playing a non zero sum game with them.

But, from 1911 to 2010 in the US, the correlation between annual real growth of prices for homes and farmland was only 5 , and the latest data on farm prices have not shown anything like the decline in home prices.

When you hold a checking or current account in your bank at a zero interest rate as most people do in advanced economies the real return is negative (the nominal zero return minus inflation) a year from now, your cash balances buy you less goods than they do today.

But this is almost certainly wrong, even though it seems to be confirmed by the tight correlation between oil and equity markets, which have fallen to their lowest levels since 2009 not only in China, but also in Europe and most emerging economies.