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Set Theory, Logic, Probability, Statistics

- Fundamentals: Set theory, logic and proofs. Probability and statistics
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Jan16-12 Greg Bernhardt
Please post any and all homework or other textbook-style problems in one of the Homework & Coursework Questions...
Feb23-13 09:25 AM
micromass
1 32,009
I'm browsing around waiting for my books to arrive, and I came across this (PDF) site that says \forall x P(x)...
May11-11 01:47 PM
xxxx0xxxx
6 9,287
I've been given the question: In a photographic process, the developing time of prints may be looked upon as a...
May10-11 06:19 PM
mathman
1 1,417
I have a question. Let's say I wanted to estimate the median income of all adults in my church. So I randomly select...
May10-11 06:02 PM
zli034
1 1,012
Hi, Suppose that an n-dimensional vector \mathbf{z}=\begin{pmatrix}z_1&z_2&\cdots & z_n\end{pmatrix}^T is...
May10-11 09:54 AM
S_David
8 5,144
Consider the Uniform distribution (continuous) U(-1,1) which has p.d.f. f(x) = 1/2 for -1 < x < 1 and 0 otherwise. ...
May9-11 10:16 PM
bpet
2 1,863
Give an example to show that if not assuming independence of X1, X2, ..., Xn it is possible to show that Var(1/n * sum...
May9-11 03:22 PM
squenshl
2 760
Hi all, http://www.physicsforums.com/attachment.php?attachmentid=35247&stc=1&d=1304691641 In this question, I...
May9-11 10:53 AM
Stephen Tashi
2 695
Wrong thread.
May8-11 10:27 PM
squenshl
0 444
Hi, i have a couple of problems that im not sure about (i get the wrong answer for particular cases because the...
May8-11 08:27 PM
bpet
28 6,856
In how many ways can obtain polynomial from http://im3.gulfup.com/2011-05-05/1304543619801.gif notes that c any...
May8-11 02:49 PM
matiasmorant
1 711
Hi everyone! I really need your help if you are good in time series. I have a problem on moving average...
May7-11 11:49 PM
Stephen Tashi
1 831
I am trying to compare two groups (for statistical significance), a control and a treatment group across more than one...
May7-11 07:49 PM
Stephen Tashi
1 2,832
Hey guys, this is just a problem I have been playing around with in my spare time, but it occurs to me that someone...
May7-11 07:36 PM
awkward
9 5,351
Trying to prepare for an exam... 4) Let f : A -> B be any function from the set A to the set B. How is the...
May7-11 05:54 PM
SW VandeCarr
4 970
Should Say Intervals.. I'm tired... I am probably going wrong somewhere but I am running into problems with...
May7-11 11:16 AM
SW VandeCarr
4 1,312
Hi all, I am now doing revision for one of the statistics module. I am having some difficulty to proove the...
May6-11 09:13 AM
ghostyc
4 4,646
sorry, i am new here and did not read the regulations.
May6-11 04:51 AM
yasharea
0 1,483
I'm used to the notation f : X --> Y for a map, where X and Y are sets. I recently came across this notation for a map...
May6-11 01:43 AM
Rasalhague
2 1,442
I have a Markov chain with an absorbing state and wish to calculate the expected time to absorption. If A is the...
May6-11 01:16 AM
bpet
0 1,028
correct me if I'm wrong, but the set of Natural numbers and the set of all positive even numbers have the same number...
May5-11 08:50 PM
SW VandeCarr
1 966
Let's define S as a 'normal' set if \neg(S \in S). Now let's look at the set of all normal sets N. If N is normal,...
May5-11 08:31 PM
eczeno
10 3,834
HI guys, i am actually a student in a engineer school in finance from France and i have some difficulties to...
May5-11 02:52 PM
kelyos
0 830
I'm writing a program that generates every possible valid Mastermind code. That itself is easy. There are 6 colors...
May5-11 02:24 PM
Hurkyl
4 988
Greetings, Maybe I'm getting a little bit confused, but I'm looking for resources which explain how to update...
May5-11 11:26 AM
SW VandeCarr
3 1,438
I have a dataset in R. What I want to do is simulate a variable that holds the same distribution. How do I do this?
May4-11 08:50 PM
dslowik
8 2,874
Now, I'm interested in all sorts of math, but currently I'm really liking statistics. However, I don't have any...
May4-11 01:31 PM
micromass
3 2,026
Hello! Hope someone can help me, I already tried some solutions, but couldn't come to a final conclusion. I need...
May4-11 10:07 AM
Stephen Tashi
9 1,694
In my lecture notes on confidence intervals the lecturer wrote this: I don't understand the notation of that...
May2-11 12:43 PM
Stephen Tashi
4 1,904
Hi, I am trying to estimate variance for negative Binomial distribution using maximum likelihood estimation and...
May2-11 06:40 AM
QuendeltonPG
2 1,527
I'm trying to calculate the inverse CDF of wrapped Cauchy distribution using Mathematica but it gets me nowhere....
May2-11 12:41 AM
bpet
1 1,471
I'm currently having trouble trying to explain a coin toss and it's probability to a friend. The question is A...
May1-11 05:39 PM
jeebs
3 1,253
Hi guys, I have a question re: random numbers and probability. If I have a random number generator that generates a...
May1-11 04:10 PM
M-quest
2 1,369
I keep reading explanations that say things like "the mean is normally approximated" but I don't know what that means....
May1-11 10:31 AM
Stephen Tashi
3 1,314
Suppose we have two hypotheses H1 and H2. We also have a potential conclusion C. We know all prior probabilities...
May1-11 10:16 AM
Stephen Tashi
1 707
Hi all: I'm looking for how to perform MANOCOVA in R packages. Only found MANOVA. Any idear? zli034
Apr30-11 09:08 AM
zli034
0 480
Let's say I have a big, 50-sided die, with values ranging from 1-50. I want to find the exact standard deviation of...
Apr29-11 06:17 PM
mathman
5 5,353
For multivariate normal distributions, Isserlis' theorem gives us moments in terms of cross-correlations, e.g., ...
Apr29-11 01:58 PM
marcusl
1 1,348
Let X be geometric parameter p. (b) Compute the Cramer-Rao lower bound for the variance (MSE) of an unbiased...
Apr29-11 01:15 PM
lildrea88
0 1,568
Every so often I return to the idea of structures as used in logic & clean up my ideas about them, here is my latest...
Apr28-11 08:35 AM
sponsoredwalk
7 1,547
Hey guys, So i'm having trouble telling what the integration bounds should be when calculation the marginal PDF of...
Apr28-11 12:23 AM
Stephen Tashi
1 1,394

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