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#151 Re: Help Me ! » linear algebra » 2010-09-05 18:56:05
The answer is Cp(x), whose x is what you just found.
#152 Re: Help Me ! » Availability... » 2010-09-05 18:51:27
Simply divide out the effeciency ratio f=Pi/pi and list them from large to small.
Then you can find the maximum.
#153 Re: Help Me ! » provement » 2010-09-05 18:47:40
Can't believe I was so smart!
Now it is a little difficult to understand my own words!
#154 Help Me ! » Why does an Linear Congruential Generator work? » 2010-09-05 18:45:36
- George,Y
- Replies: 2
suppose you have a pair of number a and b, whose largest common factor is 1.
And you multiply a by natural numbers then divide the result by b and get remainders. It must be b times until you get the same remainder when each the non negative numbers smaller than b appears once.
e.g
7 5
7*1=7 7|5=1...2
7*2=14 14|5=3...4
7*3=21 21|5=4...1
7*4=28 28|5=5...3
7*5=35 ...0
Apparently this theorem shall be proven by contradiction
But does anyone remember what this theorem is called? 
#155 Re: Help Me ! » Explain why 0.3 = 0.30 = 0.300 etc. » 2010-09-05 18:36:27
Actually, they are a little bit different.
The 0.30000 may not exist whilst 0.3 could in the real world when the entity can be divided into no more but 10 parts.
#156 Re: This is Cool » Inverse of square matrix » 2010-07-26 18:27:05
sorry for the typo Cramer mistaken as Crammer
Here is what the determinants are created for
#157 Re: Help Me ! » system of nonlinear equation » 2010-07-25 15:09:09
I am curious how you transfered the answer from Mathematica to this post, bobbym.
Did you type it?
#158 Re: Help Me ! » probability integral » 2010-07-25 15:06:27
Brilliant, bobbym.
I forgot how to use direct substition - time to pick calculus up.
#159 Re: This is Cool » Inverse of square matrix » 2010-07-25 14:58:51
Determinant is created to solve equations using the Crammer's Rule.
So you need to be familiar with properties of such a determinant first,
then can you go ahead to understand how it works in solving a group of linear equations via Crammer's Rule
It is really a smart mathematic invention!
So far!
#160 Re: Help Me ! » probability integral » 2010-07-25 01:35:21
How da you do it
#161 Re: Dark Discussions at Cafe Infinity » Why is quiz part often harder than content in a maths textbook? » 2010-07-25 01:33:57
#162 Re: Dark Discussions at Cafe Infinity » Why is quiz part often harder than content in a maths textbook? » 2010-07-25 00:40:08
George Casella's
Statistical Inference
I guess it is too hard for my self study
#163 Re: Help Me ! » Probability Series » 2010-07-25 00:34:00
Yes, thank you, bobbym
#164 Help Me ! » Probability Series » 2010-07-24 23:39:22
- George,Y
- Replies: 2
suppose a distribution is defined on the range of nonnegative integers
prove
whereas
#165 Dark Discussions at Cafe Infinity » Why is quiz part often harder than content in a maths textbook? » 2010-07-24 21:28:42
- George,Y
- Replies: 3
I find many problems very very tough to do in Casella's probability textbook, which reveals knowledge not covered in his content.
It seems a convention that maths teachers leave the hardest part in problems.
Unfortunately I am not a guy relying on answer manuals.
Geeeeeeeeeeeeeeeeee!
#166 Re: Dark Discussions at Cafe Infinity » Stock market prediction » 2010-07-24 21:23:36
Hi jk
I am working on it
Still, I need to build probability knowledge, time series, wavelet analysis from scrach.
Quant is a tough job.
#167 Re: Help Me ! » Probability Question » 2010-07-24 15:20:58
is it a pure empirical result?
#168 Re: Help Me ! » Probability Question » 2010-07-24 13:43:33
what is the general formula for the probability under n numbers though?
#169 Help Me ! » probability integral » 2010-07-24 13:37:51
- George,Y
- Replies: 7
could you please solve
#170 Re: Help Me ! » exponential integral » 2010-07-21 18:50:20
wait, it is still not solvable for the p part...
#171 Re: Help Me ! » exponential integral » 2010-07-21 18:48:26
if you can manipulate the integral into the form
then it is solvable
parameter h is not important
you need to get
(-a,b,-c) = (-a,m+n,-c)
and
(-a,m) = p(-d,f); (b/2,-c) = q(-d,f)
#172 Re: Help Me ! » Tough Exponential Integral » 2010-07-21 18:34:36
anyone? 
#173 Help Me ! » Tough Exponential Integral » 2010-07-21 18:33:12
- George,Y
- Replies: 1
So tough that the textbook omits its derivation
MGF of a log-normal distribution
#174 Re: Help Me ! » Probability Question » 2010-07-21 18:27:41
Do you come from New Jersey, jerseygirl?
#175 Dark Discussions at Cafe Infinity » electronic book devices » 2010-07-10 02:58:51
- George,Y
- Replies: 3
Hi all
I want to buy an electronic book device that can download many ebooks that I bought from internet. Initially kindle seemed a good choice, but its bookstore is open to US people only. In order to have downloading access, I have to fake an US ip in Amazon.com, provided I have a BoA debit card already.
I am looking for an alternative that shares ebook collections almost as large as that of Amazon, but more accessible. Still I like the e-ink eye protection feature. Could you recommend me one?
Thanks
