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I have a Ph.D. with a minor in mathematics and a major in statistics.


2d
revised Is $dx\,dy$ really a multiplication of $dx$ and $dy$?
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2d
revised How do mathematicians know what is known?
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2d
comment Does $x^2+x+1 \equiv 0 \pmod {997}$ have solutions? Why or why not?
The number $-3$ does have two square roots mod $997$ namely $\pm308$. And $-308\equiv609$. ${}\qquad{}$
2d
answered Does $x^2+x+1 \equiv 0 \pmod {997}$ have solutions? Why or why not?
2d
revised Dirac delta function under integral
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2d
comment Ordered logistic regression with likert scales
This question might fare better on stats.stackexchange.com.
2d
revised Maximum absolute column sum of the matrix norm inequality
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Jul
28
comment Sufficient statistic
@Anoldmaninthesea. I've added a bit more. I shall return$\,\ldots$ ${}\qquad{}$
Jul
28
revised Sufficient statistic
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Jul
28
revised A series involving inverses of harmonic numbers
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Jul
28
comment Minimum number of samples to take so that proportion of smokers in sample is within a certain threshold?
@sonicboom : "Eupraxis1981" has pointed out that $1.96$ was dropped at one point in the argument. I've added it.
Jul
28
comment Minimum number of samples to take so that proportion of smokers in sample is within a certain threshold?
Thank you, @Eupraxis1981. I forgot $1.96$ at that point; now I've added it.
Jul
28
revised Minimum number of samples to take so that proportion of smokers in sample is within a certain threshold?
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Jul
28
revised $\operatorname{Aut}(S_4)$ is isomorphic to $S_4$
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Jul
28
answered Minimum number of samples to take so that proportion of smokers in sample is within a certain threshold?
Jul
28
comment Minimum number of samples to take so that proportion of smokers in sample is within a certain threshold?
You should be calling it the size of the sample rather than the number of samples.
Jul
28
revised Multivariate distribution
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Jul
28
revised Find modulus of $z$ given modulus of $(z-3w)/(3-z\overline{w})$
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Jul
28
revised Find modulus of $z$ given modulus of $(z-3w)/(3-z\overline{w})$
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Jul
28
comment Find modulus of $z$ given modulus of $(z-3w)/(3-z\overline{w})$
Knowing a little bit about the geometry of linear fractional transformations can get you the answer. See my answer below.