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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
1 32,762
Imagine points in a plane with a uniform density. To use a simple model, consider just a finite region such as the...
Jul28-14 09:55 PM
2 220
Hi everybody, I apologize if this question is too basic but I did 1 hour of solid Google searching and couldn't find...
Jul28-14 04:07 PM
2 225
I have 3 fair dices. The probability of 2 of them lying in the same number without the 3rd doing so is given by...
Jul28-14 09:38 AM
9 616
Prove Russel's paradox by contradiction and what does it tell us about sets? I tried doing it like this and I am not...
Jul27-14 10:52 AM
Stephen Tashi
5 933
From what I understand, and please correct me if I'm wrong: An "Argument" in sentential logic is a set of...
Jul27-14 03:07 AM
7 3,217
I've been figuring out the use of the nonparametric bootstrap and if I understand correctly, this is the procedure: ...
Jul25-14 10:31 AM
Stephen Tashi
3 872
I thought I understood all the theory quite well and sat down to begin coding until I realized that calculating a...
Jul25-14 08:36 AM
4 570
Suppose I have around 20 exposures that potentially affect an outcome and I want to see which exposures have bigger...
Jul24-14 09:14 PM
3 511
Three statements: 1) I will take a shower if the water is warm. 2) I will take a shower unless the water is cold....
Jul22-14 04:04 PM
14 1,195
I ran a multinomial logistic regression on some likart data (1-5 survey response questions). For some background, the...
Jul21-14 03:58 PM
2 818
Hello, From an offset zener diode breakdown circuit, I have collected a set of bytes from an ADC. The values...
Jul20-14 06:06 PM
8 1,088
The name in the title is probably not what it's called but it so similar that I chose it anyways. This is a problem...
Jul20-14 04:50 PM
14 3,769
Suppose we have a class equivalence relation ~ on a proper class C. Can we form the class of equivalence classes C/~?...
Jul19-14 09:21 PM
10 1,792
hi pf! so i am going to take the skewness and kurtosis of a sample. however, if i already have a pdf, is there...
Jul18-14 07:07 AM
Simon Bridge
4 1,370
I am reading Introduction to Set Theory (Jech & Hrbacek) and in one of the exercises we're asked to prove that the...
Jul18-14 01:05 AM
8 1,269
So, today we were studying the introduction of probability. For me it is fairly simple (for now). My question is...
Jul15-14 09:45 PM
4 1,925
I am trying to derive the Probability distribution of Geometric Brownian motion, and I don't know how to find the...
Jul15-14 01:56 PM
Greg Bernhardt
1 2,060
Okay, so I guess my first question is if the main utility of the normal distribution ##f(x)## is to provide a...
Jul14-14 04:01 AM
2 2,343
Consider a one-dimensional random walk on the integer lattice, starting at 0. The next step is decided to be +1 or -1...
Jul14-14 03:26 AM
4 2,477
So I take <z10, +> this to be the group Z10 = {0,1,2,3,4,5,6,7,8,9} Mod 10 group of additive integers and I...
Jul12-14 07:08 PM
5 2,402
I've been thinking about the Central Limit Theorem and by my understanding it states that the sum of randomly...
Jul11-14 01:12 AM
4 1,872
I'd like some help understanding a proof, from Properties are introduced, which a...
Jul9-14 01:22 PM
5 3,359
Hey! I'm working with some regression related stuff at the moment and i'd need some help with multiple variable...
Jul7-14 07:42 AM
4 3,353
I am studying an article which involves stochastic variables
Jul6-14 04:30 PM
1 1,995
I understand how using classical or bayesian statistical inference os often very helpful for solving information...
Jul2-14 07:10 PM
1 2,512
I have a set of scored items with the scores in the interval . Roughly speaking the distribution of scores is about...
Jul2-14 08:46 AM
2 2,870
i am a complete nooby in statistics, therefore the question i am about to ask may sound very unprofessional warning :)...
Jul1-14 10:15 PM
Greg Bernhardt
1 2,481
I am starting a project on signal detection theory (cognitive focus), and working with a winbugs expansion in matlab....
Jul1-14 10:00 AM
1 2,690
When you have a graph like this one here: Of course...
Jul1-14 08:45 AM
Greg Bernhardt
1 2,406
Hello again pf! i was wondering if any of you could help me with the intuition for the following structure...
Jul1-14 08:45 AM
Greg Bernhardt
1 2,597
I think the first thing that is confusing me is the terminology. There are too many similar terms (e.g. probability...
Jun30-14 09:00 PM
16 3,101
I try to understand the following equation but I can not. I have basic knowledge about Bayes rule and joint...
Jun30-14 03:59 PM
1 2,316
Dear Fellows, If we fit our data to a quadratic equation then What is meant by standard error for linear and...
Jun29-14 10:19 AM
Stephen Tashi
3 2,656
Of the 32 teams that qualify for the world cup (8 groups with 4 teams each), what percentage would a roster of 16...
Jun27-14 04:05 PM
2 2,436
I was watching yesterday my county(Greece) in international cup,and I thought something about probabillities. Lets...
Jun26-14 04:08 PM
6 2,646
I'm a salesman and I have a list of 100 addresses all equidistant from each other and from where I'm standing right...
Jun26-14 11:24 AM
6 2,583
I really need some help here, will appreciate any effort. I calculated time series of tidal stresses. It turned out...
Jun25-14 10:50 PM
Stephen Tashi
2 2,385
Hi, I would like to score an item. The item has around 10 parameter. Each parameter is depics how it reacts to...
Jun25-14 09:23 PM
2 2,336
How far could you see, on average, from a planet that was surrounded with infinite number of identical stars like the...
Jun25-14 09:52 AM
55 14,077
I have a psychological testing instrument that produces an ordinal measure (0, 1, 2, 3, 4, 5). I want to change this...
Jun25-14 06:49 AM
Simon Bridge
7 2,336

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