
Please post any and all homework or other textbookstyle problems in one of the Homework & Coursework Questions...

Feb2313 09:25 AM
micromass

1 
32,583 
Let's pretend I have a bag of 40 marbles. 19 marbles are red, 21 marbles are blue. If I randomly pick 5 marbles out of...

Y 08:50 PM
HallsofIvy

7 
212 
The differential form of a stochastic variable can be expressed as $$dx=a(x)dt+b(x)dw(t)$$, here w(t) presents the...

Y 08:12 PM
chern

0 
84 
Imagine a million different names are in a hat, yours among them. Some number N of names will be drawn, decided by...

Y 08:11 PM
Ken G

18 
352 
Hi,
I have never quite worked this type of probability question out, so would like some help please.
Imagine...

Y 02:35 PM
Matterwave

4 
217 
Ok. I don't understand sets within sets. No one has been able to explain it to me simply.
So you can have sets...

Y 01:54 PM
caveman1917

8 
172 
I remember someone telling me that it's impossible to create a program that determines whether a given program runs...

Aug2914 08:11 AM
Jamin2112

6 
215 
Hi,
I'm hoping to clear up a few uncertainties in my mind about proving that the identity element and inverses of...

Aug2814 09:22 PM
"Don't panic!"

6 
129 
I have an application where I need to pick a probability distribution (x_{1},\ldots,x_{n}) at random and uniformly...

Aug2814 03:05 PM
stlukits

4 
208 
I am interested to know, possibly in nontechnical lay terms, which axioms are really needed to prove the Goodstein's...

Aug2814 08:03 AM
jedishrfu

3 
183 
P > Q
P Q P>Q
T T T
T F F
F T T
F F T
I understand the condition "P is sufficient for Q". But I'm...

Aug2714 01:12 PM
Stephen Tashi

1 
145 
Hi can someone please clarify info regarding the application and validity of the Dickey Fuller test.
If I perform...

Aug2714 01:00 PM
EmmaSaunders1

0 
107 
I am trying to implement what's called the "second spectrum". Basically, you do this:
1. Take a time series of...

Aug2714 11:57 AM
Stephen Tashi

3 
173 
I'm a starting amateur mathematician. I'm studying Gödel's incompleteness theorem and have a couple of rookie...

Aug2714 07:43 AM
felipecoirolo

2 
181 
I find this problem pretty interesting and I'd like to know more about it and what topic of math it comes from.
...

Aug2514 09:28 PM
FactChecker

2 
140 
The following problem is from "Probability and Statistics in Engineering  Hines, Montgomery"
A potential customer...

Aug2514 08:50 AM
Ken G

2 
111 
Undecidability of Q
Below is a proof of one of the key steps in Godel's first incompleteness theorem. It appears to...

Aug2314 11:45 PM
andrewkirk

0 
46 
Hi all, I was going over the poll
http://www.physicsforums.com/showthread.php?t=766275, and I was wondering how one...

Aug2314 04:02 PM
FactChecker

3 
184 
I'm reading about the exponential family of distributions. In my book, I have the expression
f(x\theta) =...

Aug2114 11:09 AM
Greg Bernhardt

1 
189 
I am attempting to calculate the even distribution of units sale across a predefined range with a final average value...

Aug2114 10:16 AM
Aston08

1 
139 
I have a function
$$F$$
I am trying to find the error correlation between the function at one point and another....

Aug2114 07:03 AM
Hepth

7 
243 
Are the Real numbers R a subset of the complex numbers C?

Aug2014 07:37 PM
jostpuur

29 
949 
Forgive my ignorance; I'm a programmer and relatively mathminded, but I haven't taken statistics since high school.
...

Aug1914 02:23 AM
Sheppie

8 
437 
I have been out of unversity statistics and biometry for a few years do date. I am working in a clical research...

Aug1614 09:11 AM
Stephen Tashi

1 
211 
does anyone know sample codes with explanation on computing Geographically Weighted Regression using MATLAB?I am a...

Aug1514 07:14 PM
Greg Bernhardt

1 
284 
I am trying to delete this thread but I am not sure how to  sorry

Aug1314 09:59 PM
jedishrfu

4 
230 
Hi all,
I Dont understand a principle from beardon, Algebra and Geometery chapter 2 real numbers...
Please...

Aug1314 12:04 PM
statdad

12 
307 
I have a group of dogs (3 brown male, 2 brown female, 4 white male, 4 white female, 5 black male, 4 black female)...

Aug1314 07:07 AM
haruspex

5 
205 
"In multivariate probability distribution higherorder cumulants contain information of decreasing significance,...

Aug1114 10:52 AM
statdad

4 
321 
Hi all,
Firstly, hope I'm posting in the right place!
I'm working with a company that works with air filters....

Aug1014 01:16 AM
haruspex

3 
282 
Consider two independent random events A and B. Is the event A/B independent from event B?
My real problem stems...

Aug1014 01:02 AM
haruspex

20 
2,126 
Hi there, I have a bit of a confusing question, but I'll try to be as clear as I can in asking it.
I have a set...

Aug1014 12:56 AM
haruspex

7 
2,054 
If you take two arbitrary numbers from a set N  lets say N stands for the natural numbers  and add them together,...

Aug914 10:53 AM
HallsofIvy

23 
603 
Mathematicians have long held that infinite integers do NOT exist, but here is a very simple argument that shows that...

Aug814 02:45 PM
phinds

13 
480 
Dear All,
I am a starter to machine learning and i am currently confused about the following problem:
what is...

Aug814 09:26 AM
Stephen Tashi

10 
337 
Just refreshing my understanding of measurable cardinals, the first step (more questions may follow, but one step at a...

Aug314 04:17 PM
mathman

2 
298 
I have some data from gas emission samples, part of the data was sampled in a region with a characteristic A and...

Aug314 12:40 PM
FactChecker

25 
682 
Hello! :)
I' have a problem...
I fitted experimental data with a second order exponential theoretical curve: ...

Aug214 03:27 PM
mfb

7 
277 
Boolean Algebra is a well known field of study in mathematical logic. In Boolean Algebra (BA), a statement can be...

Aug214 01:10 PM
adrianmitrea

21 
1,022 
So, I'm having a pretty lazy day and decided to do some thinking. And, while this usually turns out to be a splendid...

Aug214 11:50 AM
Hornbein

13 
377 
I have a list of scores between 0 and 1 generated by an information retrieval system  1 being very relevant and 0...

Aug214 02:56 AM
Stephen Tashi

4 
243 