one tiny question for clever maths people Watch

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me!
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is the symbol for standard deviation lower case sigma, and is the symbol for spearman's correlation coefficient rho?

Thanks in advance
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Meeps
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(Original post by me!)
is the symbol for standard deviation lower case sigma, and is the symbol for spearman's correlation coefficient rho?

Thanks in advance
yep sort off.

rho represents both product moment and spearmans rank as the estimated correlation of the population at a certain significance level.

with sigma your spot on!
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(Original post by Meeps)
yep sort off.

rho represents both product moment and spearmans rank as the estimated correlation of the population at a certain significance level.

with sigma your spot on!
thanks

I might just use the r subsript thing >>>s for spearmans
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(Original post by me!)
is the symbol for standard deviation lower case sigma, and is the symbol for spearman's correlation coefficient rho?

Thanks in advance
Sigma on its own regardless of whether it is lower or upper case is the standard deviation. Variance is S.d squared.
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(Original post by Bhaal85)
Sigma on its own regardless of whether it is lower or upper case is the standard deviation. Variance is S.d squared.
I don't suppose you would know how to work out PMC? I've got this formula for spearman's rank, and I've worked that out...
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Bhaal85
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(Original post by me!)
I don't suppose you would know how to work out PMC? I've got this formula for spearman's rank, and I've worked that out...
Product moment correlation coeffiecent?
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(Original post by Bhaal85)
Product moment correlation coeffiecent?
yep... is spearmans rank and spearmans rho the same thing?
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yep... is spearmans rank and spearmans rho the same thing?
I have done Spearmans ranks correlation coefficient but not rho, what is that?

Would you like me to explain how to do PMCC?
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(Original post by Bhaal85)
I have done Spearmans ranks correlation coefficient but not rho, what is that?

Would you like me to explain how to do PMCC?
Jsut curious, but why on earth are they allowing you to do PMCC, as it is A-level stats?
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(Original post by Bhaal85)
Jsut curious, but why on earth are they allowing you to do PMCC, as it is A-level stats?
it's GCSE... yeasssss I would be very greatfull if you could explain it

I think spearmans rank and spearmans rho is the same thing but i'm not sure...

EDIT: I meant I'm doing GCSE stats, not that PMCC was GCSE
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it's GCSE... yeasssss I would be very greatfull if you could explain it

I think spearmans rank and spearmans rho is the same thing but i'm not sure...
Well I only got 90/100 in Statistics 1 at A-level. I'll try my best.

PMCC = Sxy / (Sxx * Syy) where:

Sxy = SigmaXY - 1/N(SigmaX*SigmaY)
Sxx = SigmaX^2 - N(X mean squared)
Syy = SigmaY^2 - N(Y mean Squared)
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(Original post by Bhaal85)
Well I only got 90/100 in Statistics 1 at A-level. I'll try my best.

PMCC = Sxy / (Sxx * Syy) where:

Sxy = SigmaXY - 1/N(SigmaX*SigmaY)
Sxx = SigmaX^2 - N(X mean squared)
Syy = SigmaY^2 - N(Y mean Squared)
You will basically set out five collums, with the headings 'X', 'Y', 'X^2', 'Y^2', AND 'X*Y'. You would then enter the appropriate values. 'N' would represent the number of pairs of data.

E.g

(2,3), (4,5), (2,0)

In the above case 'N' would be three.

After entering the data in the appropriate collumns. You would then calculate the total for each column, hence the Sigma. So the the total of the 'X' column would be called SigmaX, the total of the column 'Y' would be SigmaY, the total of the column 'X*Y' would be called SigmaXY, etc.
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http://www.mathsnet.net

Great site for more info.
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Thanks Bhaal, it looked kind of complicated but I think I actually understand it :eek:
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Thanks Bhaal, it looked kind of complicated but I think I actually understand it :eek:
Your Welcome.
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I got another question if anyone would like to help me... Has variance got something to do with the least squares regression line thing?
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