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Nishant1

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tT
发表于 2011-7-13 15:14 | 只看该作者

covariance of 2 return data

like, example, returns, someone
So I know how to do the covariance of 2 return data when each return is given a probability, but I haven't seen an example when the returns are for sure like in a yearly return...


year ..... asset a ..... asset b
1 .............10%............12%
2 ............. 8%............-2%
3 ..............3% ............ 5%


can someone show my the calcs for this? Thanks!

 

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Jolyn

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2#
发表于 2011-7-13 15:14 | 只看该作者
(Ra - MUa)(Rb - MUb) for years 1, 2 and 3. divide by n-1 = 3-1 = 2 since this is a sample

Ra is 10, 8, 3 the returns. Rb is asset b returns

MUa is average of a, MUb is average of b

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soddy1979

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3#
发表于 2011-7-13 15:14 | 只看该作者
Use BAII

2nd data - load it in
2nd stat - should have all the basics you need for cov.

just be careful re: pop or sample. There are threads on this going back 2 years or so. Should be around.

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chetan86

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4#
发表于 2011-7-13 15:14 | 只看该作者
june2009 Wrote:
-------------------------------------------------------
> Use BAII
>
> 2nd data - load it in
> 2nd stat - should have all the basics you need for
> cov.
>
> just be careful re: pop or sample. There are
> threads on this going back 2 years or so. Should
> be around.


so what's the symbol for covariance on the calc?

because all I need is the average to get the covariance and it would be faster to just calculate the average instead off all that...

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Mechanic

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5#
发表于 2011-7-13 15:14 | 只看该作者
so what's the symbol for correlation in the calculator?

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pogo

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6#
发表于 2011-7-13 15:15 | 只看该作者
Where can we find the "p" symbol? Have spent the last 10 minutes trying to flipping find it.

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cchang

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7#
发表于 2011-7-13 15:15 | 只看该作者
Just download the manual for Texas BA II Plus. It shows you the steps. You have to put the calculator in linear regression mode. Then enter your data, and the calculator gives you the correlation coefficient (this is the "r" value under the "STAT" sheet).

Once you have "r" you can plug-n-chug the covariance formula (see jun2009's post above).

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JPSem

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8#
发表于 2011-7-13 15:15 | 只看该作者
Did anyone do it on their calculator? Do you get covariance as 6.99?
(Correlation .277?)

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rkapoor

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9#
发表于 2011-7-13 15:15 | 只看该作者
I can confirm that the correlation is 0.277 on my calculator. However, I think someone (with a lot of extra time) needs to do it the manual way and confirm the answer. The original post is almost a year old, so I don't think the OP is going to confirm what the answer is.

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