Hi,

Mathematically no such measure exists. Correlations are a measure (if you will) of relation between two variables ONLY. Measuring the three correlations separately is the typical approach. You could run PCA (principle component analysis) on your correlation matrix to understand their linear relationship somewhat more.

If you are in interested in understanding and modelling the relationship between more than two variables OR are interested in other modelling techniques that measure the relationship between two variables then I suggest that you research the topic known as "Copulas". This will also introduce you to the next step of random variable relationships and their lovely complexities.

Mathematically Copulas can be a substantial step so only tread there if mathematically able and willing to learn.

Cheers,

> On Monday, May 17, 2010 7:21 AM Eileen wrote:

> Hi.

>

> I was wondering if it was possible to work out the correlation between three

> sets of variables in excel, and not just two.

>

> The data looks like this (example values):

>

> 15,283,741,924 22,891,175,671 182,489,383

> 12,450,453,827 25,604,121,237 458,039,634

> 25,017,912,202 10,105,478,615 408,312,030

> 15,608,597,275 27,352,700,295 71,393,406

> 6,293,126,663 33,730,623,537 699,182,754

> 15,665,042,562 25,952,123,256 76,238,591

> 11,565,224,759 30,426,279,924 44,724,721

> 8,716,353,737 33,395,986,265 135,495,541

> 11,234,337,068 23,463,987,625 1,163,192,672

> 16,285,868,769 21,238,873,761 1,777,205,148

> 10,406,955,459 31,623,688,840 71,934,583

> 5,827,079,717 38,907,282,319 964,824,980

> 11,626,458,649 21,043,475,527 35,381,302

> 4,081,044,992 41,239,034,015 835,902,380

>

> I have used the correl function to work out the two variable correlation

> between columns A/B, A/C and B/C. Now I'd like to see the three variable

> correlation between columns A/B/C.

>

> Is this possible?

>

> Thanks in advance for your help.