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

Feb2313 09:25 AM
micromass

1 
31,724 
Given a simple random walk X_n started at 1, and stopped the first time it hits zero (so it could be something like...

May910 04:55 PM
palace

0 
1,217 
Hello all,
I am deparing me with a problem or a doubt about the calculation of probabilities in one matrix.
I...

Mar607 08:23 AM
Paixao

0 
1,095 
How to define relationship between two sets (mathematics)?
Please, let me make an assumption here.
Assumption : We...

Mar2311 12:25 PM
Stephen Tashi

1 
2,140 
I want to know what is the meaning of percentile.
what is the percentile : 23.79 means?
Please give me explanation...

Aug1911 12:26 PM
AudioFlux

1 
2,656 
is it true that:
\partial(A\cup B) = (\partial(A)\cap \mbox{int}(XB))\cup (\partial(B)\cap \mbox{int}(XA))
?...

Sep1105 10:47 AM
painfive

1 
3,984 
Let X1 and Y1 be two random variables. We have Cov(X1,Y1) = 0. Does this extend to any transformation X2 = g(X1) and...

May1313 10:14 AM
Stephen Tashi

2 
422 
I have two sets of deterministic numbers, collected in the two vectors: x= and y=. My (determinstic) theory says that...

Nov211 11:02 AM
Stephen Tashi

1 
944 
Let's say we have a cumulative distribution function (cdf) G and random numbers v1 and v2.
The definition of strict...

Nov911 06:23 PM
chiro

3 
1,554 
I have N random variables (x1,x2,...,xN) following a Dirichlet distribution with parameter vector (1,...,1). That is,...

Apr3013 04:37 AM
PAHV

0 
370 
Let x(1),...,x(N) all be independent uniformally distributed variables defined on (0,1), i.e. (x(1),...,x(N)) ...

May1013 01:55 AM
chiro

5 
651 
A Binomial distribution has a standard normal limiting distribution, i.e. (XE)/se(X) > N(0,1), where X is the sum of...

May2213 03:27 AM
PAHV

2 
578 
Hi,
I would like to solve this version of the unfair coin problem.
The coin has a probability p for head and 1p...

Aug1709 03:35 AM
pagheca

2 
2,506 
I know this might be really simple, but I get easily confused.
CASE 1.
I have a bag with eight marbles, one of...

Oct606 07:51 AM
Paddy

2 
1,304 
Hi everyone, very excited to be here and this my first post.
I have a question about data fitting by using least...

Aug511 03:52 PM
mathman

1 
1,451 
Hi,
Say F:A>A where A is a metric space and F is onto. I think it should be true that this implies that F is also...

Sep2709 09:08 PM
HallsofIvy

7 
3,220 
I am starting a project on signal detection theory (cognitive focus), and working with a winbugs expansion in matlab....

Jul114 10:00 AM
scinoob

1 
2,247 
I understand how using classical or bayesian statistical inference os often very helpful for solving information...

Jul214 07:10 PM
marcusl

1 
2,121 
Hi i am currently doing a project and I am taking as input a set of X and Y variables.
I have implemented linear...

May2709 12:40 PM
pablo26

2 
1,019 
This is the QQPlot of a data. What can be inferred from this plot ?
(Tested against Normal Distribution)
QQPLOT 1 :...

Sep2712 04:06 AM
paawansharmas

2 
734 
My doubt is that whether we can apply nonlinear smoothing to a almost linear data ( without one or 2 discontinuity)
...

Apr613 02:53 PM
ssd

4 
504 
Hi there!
I'm working on a random walkproblem my professor gave me.
Given a MC with the following properties:...

Oct1412 03:26 PM
Paalfaal

2 
704 
It'd be great if anyone can tell me how to work these kinds of function and induction problems. Don't worry, these are...

Sep3007 10:19 PM
p4nda

0 
2,176 
I need help on converting these to the correct logical notation form using only the propositional connectives and the...

Dec807 09:03 PM
KingOrdo

8 
3,487 
Suppose that f:\longrightarrow{\mathbb{R}} is a function such that f(.,y) is constant for almost all y, and f(.,y) is...

Jan1810 11:13 PM
p33rz

0 
704 
Hi, I've been trying for 3 hours to solve this proof using identities. I can't seem to get it.
Can i get a little...

Apr2411 03:52 AM
tinytim

9 
4,853 
Hi,
I'm in need of a book recommendation :smile: .
As a practicing physicist I get to use some statistics now and...

Jan1708 11:43 AM
EnumaElish

1 
3,285 
I've read (and I've been told in lectures) that each graph (let's just say a combinatorial graph) corresponds to a...

Aug1706 10:11 AM
AKG

10 
1,431 
Does the choice function let me choose exactly one element from a set? The set which I am choosing from must be the...

Oct406 02:43 PM
CRGreathouse

73 
6,334 
I have 6 years of data which has both a 3month and a 12month seasonality, it exhibits a trend and is very noisy.
...

Jul711 12:17 AM
Oxymoron

0 
694 
So here is the problem:
Now what seems logical to me is first choose 1 of the 10 nonperforming and then choose...

Jan911 10:58 PM
mXSCNT

3 
2,720 
Hey all,
I have an engineering background with a pretty terrible grounding in statistics and just about all maths...

Feb2411 12:12 PM
diggy

9 
2,969 
A set is not allowed to has itself as a member: X \notin X. But I wonder if this is allowed: \{X\} \in X.

Jan111 03:40 PM
JeremyHorne

5 
927 
hi
i have an exam after 1 week and while i was studying i found this simple problem
but i couldnt answer it as the...

Nov509 04:21 AM
HallsofIvy

1 
746 
Does the following make sense:
E(e^{X}) = 0 \Rightarrow X = \infty\quad a.s. ?
(Intuitively yes, but...

Jun1311 06:06 PM
micromass

1 
955 
Let M_t = \sum_{i=1}^\infty \frac{1}{i} (N_t^i  \lambda t) where \{ N^i \} is a sequence of iid Poisson processes...

Jun1411 09:11 PM
spamiam

1 
2,006 
Greetings,
I'm making a statistical calculator for game analysis, and have an interesting problem.
Here is a...

Feb2310 07:58 PM
zli034

3 
1,825 
Hello!
I have the following problem
My Physical System
I have a sensor which changes resistance on application...

Jun2509 05:31 AM
Oscar6330

0 
712 
i need a general form to solve Prob(a or b or c ... or z) that r not mutually exclusive.
i managed to derive it for...

Mar2210 02:17 PM
osaad

2 
2,031 
Hello:
I am referring to 'Table of Laplace Transforms' by Roberts&Kaufman. But I cannot seem to get a soln for the...

May608 05:39 AM
orstats

0 
1,866 
Hi,
i have problems differentiating these two terms. can anyone give some examples of these two terms? Thanks!

Aug1705 10:36 AM
EnumaElish

1 
5,442 