network profile
| bio | website | victorandree.se |
|---|---|---|
| location | Sweden | |
| age | 23 | |
| visits | member for | 1 year, 6 months |
| seen | Jan 15 '12 at 23:39 | |
| stats | profile views | 22 |
Swedish freelance web developer, economics student and PR rookie. Big believer in the semantic web and emerging web technologies. Experience with mainly Python, PHP, Javascript and Objective C.
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Sep 1 |
awarded | Autobiographer |
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Jan 15 |
accepted | Relationship between two random, normally distributed variables |
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Jan 15 |
comment |
Relationship between two random, normally distributed variables I'm not discounting the possibility that my book is wrong; it has an awful lot of errors... If you stand by your latest answer? |
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Jan 15 |
comment |
Relationship between two random, normally distributed variables Well, I'm starting to feel stupid here. We've been taught to consider $$D = aX + bY$$ which in this case should be $$D = -X + 0.7Y$$, but then I still get $$2ab\rho\sigma\sigma = 2 \cdot 0.7 \cdot -1 \cdot 0.8 \cdot 6 \cdot 7$$ which is negative? |
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Jan 15 |
comment |
Relationship between two random, normally distributed variables Hm. The formula I have is $$D = aX + bY$$ and I used a = -1, b = 0.7. Then (from my book), $$\sigma^2_D = a^2\sigma^2_X + b^2\sigma^2_Y + 2ab\rho\sigma_X\sigma_Y$$ |
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Jan 15 |
comment |
Relationship between two random, normally distributed variables I see... but I don't see why. The formula I have to find the variance of D does not use squares. It's just $$a^2\sigma^2 + b^2\sigma^2 + 2abCorr(X, Y)\sigma\sigma$$ (I'm being sloppy with the subscripts here, but yeah). |
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Jan 15 |
asked | Relationship between two random, normally distributed variables |
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Nov 6 |
comment |
Creating pairs of homo-, bi- and heterosexual boys and girls I initially misinterpreted "if there are d bisexuals" to mean "exactly d". Thanks for the answer, it works smashingly! |
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Nov 5 |
awarded | Scholar |
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Nov 5 |
accepted | Creating pairs of homo-, bi- and heterosexual boys and girls |
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Nov 4 |
awarded | Supporter |
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Nov 4 |
awarded | Editor |
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Nov 4 |
revised |
Creating pairs of homo-, bi- and heterosexual boys and girls added 4 characters in body |
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Nov 4 |
awarded | Student |
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Nov 4 |
comment |
Creating pairs of homo-, bi- and heterosexual boys and girls @Phira: The man should, however, also like to marry her (i.e. he should not be homosexual). |
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Nov 4 |
comment |
Creating pairs of homo-, bi- and heterosexual boys and girls @Phira: Indeed she would be! I'm kind of unfamiliar with this whole area of mathematics, but I'll have a look at the Wiki page :) |
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Nov 4 |
asked | Creating pairs of homo-, bi- and heterosexual boys and girls |
