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In statistics, **dependence** is any statistical relationship between two random variables or two sets of data. **Correlation** refers to any of a broad class of statistical relationships involving dependence, though it most in common usage often refers to the extent to which two variables have a linear relationship with each other.
Familiar examples of dependent phenomena include the correlation between the physical statures of parents and their offspring, and the correlation between the demand for a product and its price.

Correlations are useful because they can indicate a predictive relationship that can be exploited in practice. For example, an electrical utility may produce less power on a mild day based on the correlation between electricity demand and weather. In this example there is a causal relationship, because extreme weather causes people to use more electricity for heating or cooling; however, statistical dependence is not sufficient to demonstrate the presence of such a causal relationship (i.e., correlation does not imply causation).

This page contains text from Wikipedia, the Free Encyclopedia -
https://wn.com/Correlation_and_dependence

**Correlation** is a measure of relationship between two mathematical variables or measured data values, which includes the Pearson correlation coefficient as a special case.

**Correlation** may also refer to:

This page contains text from Wikipedia, the Free Encyclopedia -
https://wn.com/Correlation_(disambiguation)

In projective geometry, a **correlation** is a transformation of a *d*-dimensional projective space that transforms objects of dimension *k* into objects of dimension *d* − *k* − 1, preserving incidence. Correlations are also called **reciprocities** or **reciprocal transformations**.

For example, in the real projective plane points and lines are dual to each other. As expressed by Coxeter,

Given a line *m* and *P* a point not on *m*, an elementary correlation is obtained as follows: for every *Q* on *m* form the line *PQ*. The inverse correlation starts with the pencil on *P*: for any line *q* in this pencil take the point *m* ∩ *q*. The composition of two correlations that share the same pencil is a perspectivity.

In a 3-dimensional projective space a correlation maps a point to a plane. As stated in one textbook:

Three-dimensional correlations also transform lines into lines, so they may be considered to be collineations of the two spaces.

This page contains text from Wikipedia, the Free Encyclopedia -
https://wn.com/Correlation_(projective_geometry)

In statistics, **dependence** is any statistical relationship between two random variables or two sets of data. **Correlation** refers to any of a broad class of statistical relationships involving dependence, though it most in common usage often refers to the extent to which two variables have a linear relationship with each other.
Familiar examples of dependent phenomena include the correlation between the physical statures of parents and their offspring, and the correlation between the demand for a product and its price.

Correlations are useful because they can indicate a predictive relationship that can be exploited in practice. For example, an electrical utility may produce less power on a mild day based on the correlation between electricity demand and weather. In this example there is a causal relationship, because extreme weather causes people to use more electricity for heating or cooling; however, statistical dependence is not sufficient to demonstrate the presence of such a causal relationship (i.e., correlation does not imply causation).

This page contains text from Wikipedia, the Free Encyclopedia -
https://wn.com/Correlation_and_dependence

Nvidia Stock Prices **Correlate** With Forward Financials. Nvidia’s shares have been **historically** related to the standard financial metrics, such as revenue, earnings, gross margin, and free cash flow ... As Nvidia has grown significantly in the last few years, it is not surprising to see the strong **correlation** between the stock price and the forward financials....

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And four, positive economic growth and equity market performance especially in United States, both of which have **historically** been positively **correlated** to overall deal activity ... It's been a really key element of our **historical** success and it's fundamental to the future of the firm ... Look as I said, the liquidity has been a big part of the hang up **historically**, while it's less of an issue today....

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Institutional investors are now recognized as essential players in the global financial system ... It’s obvious that they are not simply pools of capital and collections of talent ... Most institutions used **historical** estimates of returns, **correlation** and volatility, plugged in relevant constraints and generated a frontier of portfolio options that theoretically matched their risk and return objectives ... That’s costly ... .......

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We can see that this **correlation** has been frequent **historically**, that is when bond yields go up, utility stocks go down. ... In theory, the **correlation** makes some sense ... Despite the **historical** **correlation**, we strongly believe that this is painting with too broad of a brush ... US interest rates, while low **historically**, are still comparably higher than many other countries especially those in Europe....

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Instead of traveling to the field trip, this field trip traveled — or, more accurately, sailed — to them ... “The whole theme of the day is for the kids to form a hypothesis of if they think the river is healthy or not,” said Suzi Bloom, director of education for Rivers of Steel ... Using living and nonliving indicators of water quality, students analyze and **correlate** their results against benchmarks and **historical** records ... .......

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FARGO — Did you notice the heavy crop of seeds on the region's trees this summer and fall? Elm seeds fell by the millions this summer at our home in Fargo. People around the region shared photographs of buckets filled with acorns and walnuts as trees produced bumper crops of seeds and nuts ... Is this true, or is it an old wives' tale? ... There is no **historical** **correlation** between a heavy seed set in trees and a bad winter ... ....

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PM's tend to be more inversely **correlated** to Currency ... Land values **historically** have **correlated** well with rates of inflation ... Valuations have tended to be high in an **historical** basis, and the low cost of capital has spurred significant expansion throughout the industry ... A Broad Commodity Based Index has shown to **correlate** well with Inflation over time ... We can also confirm that this ETN does look to **correlate** well with Inflation rates....

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China's economy expanded at its slowest pace for nine years in the third quarter, fuelling concerns about the key driver of global growth ... - 'China sneezes' - ... "While the US markets have been somewhat insulated from China equity market meltdowns this year, that strong **historical** **correlation** that 'when China sneezes the rest of the world catches the flu' is starting to take hold," said Stephen Innes, head of Asia-Pacific trade at OANDA....

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QUESTION. Mr. Armstrong; You mentioned that the environment was the primary cause of the Greek Dark age between the Heroic and Hellenistic periods ... Thank you ... MG. ANSWER ... There is a lack of contemporary **historical** explanation documenting this period. However, **correlating** it with the weather, it appears that we are dealing with a Climate Change where the Earth entered into a very cold period and crops failed forcing a migration south....

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South Dakota and Nebraska are on pace for record corn and soybean production, but the challenge lies in getting it out of the field ... Department of Agriculture (USDA) meteorologist Brad Rippey ... "**Historically**, it has meant warmer-than-average temperatures in the North Central states. It’s not well **correlated** to the precipitation for most of our region, but some areas do tend to be a little bit drier during an El Nino winter." ... The Oct ... 1....

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Both direct and inverse **correlations** seem to have been thrown out of gear and operating in a manner contrary to **historical** patterns; for example, given the heightened sense of geopolitical environment currently prevailing, the demand for gold should have been at an all-time high, but the exact reverse has happened....

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“**Historically**, the **correlation** between the S&P 500 and Bitcoin has been insignificant. Although **correlation** values between the two asset classes has ticked up this year versus **historical** averages, with the current **correlation** hovering around .11, we believe this to be an insignificant value and don’t believe the two markets to be related....

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WorldNews.com | 23 Oct 2018

Russia Today | 23 Oct 2018

Russia Today | 23 Oct 2018

The Guardian | 23 Oct 2018

Tampa Bay Times | 23 Oct 2018

WorldNews.com | 23 Oct 2018

WorldNews.com | 23 Oct 2018

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