Today [12]

Arc · 14 Oct 2013

Borg 386 said:

Today & tomorrow we have Fall Break. Two days of relaxing....or in my case, hitting the online math homework problems to get them done. Most of which have formulas like this:

Simple correlation coefficient .... large to look, easiest to compute within bivariate/multivariate analysis :)

Tonight it was a fun night. Crackers, fireworks, music, DJ, dance .....

Arc · 14 Oct 2013

x BlueRobot said:

Borg 386 said:

Today & tomorrow we have Fall Break. Two days of relaxing....or in my case, hitting the online math homework problems to get them done. Most of which have formulas like this:

Doesn't the E symbol mean sum of?

That is the summation notation, Capital Sigma.
In the same equation, there is a part that is also denoted by sigma, but small sigma, which means standard deviation. This part of the denominator is read as "Sigma X" or SD of X ....

And the other part is as Sigma Y, SD of Y.

mitchell65 · 14 Oct 2013

Arc said:

That is the summation notation, Capital Sigma.
In the same equation, there is a part that is also denoted by sigma, but small sigma, which means standard deviation. This part of the denominator is read as "Sigma X" or SD of X ....

And the other part is as Sigma Y, SD of Y.

Just couldn't agree with you more Arc

kado897 · 14 Oct 2013

andrew129260 · 14 Oct 2013

Arc said:

x BlueRobot said:

Borg 386 said:

Today & tomorrow we have Fall Break. Two days of relaxing....or in my case, hitting the online math homework problems to get them done. Most of which have formulas like this:

Doesn't the E symbol mean sum of?

That is the summation notation, Capital Sigma.
In the same equation, there is a part that is also denoted by sigma, but small sigma, which means standard deviation. This part of the denominator is read as "Sigma X" or SD of X ....

And the other part is as Sigma Y, SD of Y.

My head hurts........

Barman58 · 14 Oct 2013

andrew129260 said:

Arc said:

x BlueRobot said:

Doesn't the E symbol mean sum of?

That is the summation notation, Capital Sigma.
In the same equation, there is a part that is also denoted by sigma, but small sigma, which means standard deviation. This part of the denominator is read as "Sigma X" or SD of X ....

And the other part is as Sigma Y, SD of Y.

My head hurts........

x BlueRobot · 14 Oct 2013

Arc said:

x BlueRobot said:

Borg 386 said:

Today & tomorrow we have Fall Break. Two days of relaxing....or in my case, hitting the online math homework problems to get them done. Most of which have formulas like this:

Doesn't the E symbol mean sum of?

That is the summation notation, Capital Sigma.
In the same equation, there is a part that is also denoted by sigma, but small sigma, which means standard deviation. This part of the denominator is read as "Sigma X" or SD of X ....

And the other part is as Sigma Y, SD of Y.

The Capital-sigma notation doesn't actually seem difficult to understand, well at least, the Wiki article gave a example which I could understand :)

Today [12]-86f29dd472e9c009dc324ec6c161d367.png

Where, i represents the index of summation; ai is an indexed variable representing each successive term in the series; m is the lower bound of summation, and n is the upper bound of summation. The "i = m" under the summation symbol means that the index i starts out equal to m. The index, i, is incremented by 1 for each successive term, stopping when i = n

Today [12]-1a693bfe9a392b08ed135a9e4117d3b9.png

A Guy · 14 Oct 2013

I was going to guess hieroglyphics

A Guy

LADYPINKtomato1 · 14 Oct 2013

I almost said ... GREEK, or would it have been GEEK ???.. lol

DocBrown · 14 Oct 2013

We may need to call in an expert