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Forum: Probability

Probability course and homework discussion. Probability distributions. Probability theory, stochastic processes

  1. Arrow Sticky Thread Sticky: We only provide homework help to those who show effort

    Welcome to Talk Stats Forum. In order to keep homework help effective and efficient, we request all members to abide by these guidelines: 1)...

    Started by quark‎, 09-30-2005 09:44 AM
    • Replies: 0
    • Views: 30,323
    09-30-2005, 09:44 AM Go to last post
  1. Transition matrix to compact set of rules?

    Hello. Could you please point me to some methods of extracting a compact set of rules that describe a Markov chain, given that chain's (often very...

    Started by arataj‎, 02-17-2013 02:32 AM
    • Replies: 2
    • Views: 1,262
    02-17-2013, 07:16 AM Go to last post
  2. Negative Binomial Distribution

    Hi, Regards

    Started by aravindavvaru‎, 10-12-2014 08:54 AM
    binomial, geometric distributions
    • Replies: 0
    • Views: 1,580
    10-12-2014, 08:54 AM Go to last post
  3. Given Joint Density Function

    f(x) { x(1+3y^2)/4 0<x<2, 0<y<1 0 otherwise 1. Find g(x), h(y) 2. Find f(x|y) 3.Evaluate P(1/4<x<1/2 | Y=1/3) in getting g(x) is this...

    Started by ARCHCOS‎, 03-09-2011 04:29 PM
    • Replies: 5
    • Views: 4,670
    03-10-2011, 04:10 PM Go to last post
  4. Joint Probability Distribution

    Joint Probability Distribution for Random Variable X and Y? Three cards are drawn without replacement from 12 face cards (Jacks, Queens, and Kings)...

    Started by ARCHCOS‎, 03-09-2011 02:26 PM
    • Replies: 3
    • Views: 5,838
    03-10-2011, 04:56 AM Go to last post
  5. Joint density function question

    let X and Y be a continuous random variables having joint density function of f(x,y)=c(x^2 + y^2), 0<=x<=1, 0<=y<=1 1) Determine the constant c.

    Started by ARCHCOS‎, 03-09-2011 02:34 PM
    • Replies: 10
    • Views: 4,000
    03-09-2011, 04:52 PM Go to last post
  6. [Discrete Probability Function] P(X²=1)= P(X=1) U P(X=-1)?

    I would like to know if this following form of interpretation is correct: ========================== Suppose I have a discrete probability...

    Started by Ardêncio‎, 04-18-2017 08:47 AM
    • Replies: 1
    • Views: 1,068
    04-18-2017, 09:18 AM Go to last post
  7. Choice probability

    I need to calculate the binary choice probabilty of 2 alternatives i and j- Each of the alternative is charectarised with a part of measurable and...

    Started by Arefe‎, 08-29-2011 03:56 PM
    choice probability
    • Replies: 1
    • Views: 2,431
    08-31-2011, 11:59 AM Go to last post
  8. E(X) and Var(X) of pgf

    Hi everybody, I have the following question that I have to answer. The pgf of a non-negative, integer-valued random variable X is given by ...

    Started by arguabsysi‎, 05-22-2008 01:18 AM
    • Replies: 1
    • Views: 3,156
    05-22-2008, 05:22 AM Go to last post
  9. Unhappy Probability and Moment Generating Functions

    Hello, I am terrible when it comes to probability and moment generating functions. I missed 2 lectures this week and I am now completely lost on...

    Started by arguabsysi‎, 05-22-2008 05:16 AM
    • Replies: 5
    • Views: 3,619
    05-22-2008, 02:43 PM Go to last post
  10. Question Probability Marbles!!

    There are 5 red marbles and 195 blue marbles. Marbles are drawn randomly with replacement. What is the smallest number of draws, (d) for which...

    Started by ari142‎, 04-28-2011 05:18 PM
    • Replies: 4
    • Views: 2,784
    04-29-2011, 03:17 PM Go to last post
  11. Expected Value - Help PLEASE!!!

    How do you find E(1/X)? X is distributed binomially with probability p and n+1 terms: X~Binom(n+1, p). So E(X) = p(n+1), but how do I find E(1/X)?...

    Started by Aria1‎, 11-02-2012 03:57 AM
    expected value
    • Replies: 6
    • Views: 1,741
    11-02-2012, 02:21 PM Go to last post
  12. My professor and I disagree on a test's answer. would love to get a second opinion.

    The question is as follows: " In a certain country: 10% of the families have no children 20% of the families have 1 child 30% of the families...

    Started by arielk‎, 02-17-2013 08:07 AM
    random sample, random variable, tests
    • Replies: 10
    • Views: 1,891
    02-25-2013, 01:01 PM Go to last post
  13. NEED HELP with Rayleigh distribution evercise!!

    Hi all!! I have some doubts in this exercise. A RV X, has a rayleigh distribution if pdf takes the form fx(x) = x/theta (exp(-x^2/2theta)) where...

    Started by arimya‎, 11-21-2013 09:34 AM
    • Replies: 0
    • Views: 1,928
    11-21-2013, 09:34 AM Go to last post
  14. Is the Poisson probability distribution correctly applied to this problem?

    THE PROBLEM The transport company XYZ owns delivery trucks traveling back and forth along 1,000 miles of roads within a state, subdivided into 10...

    Started by Ariovistus‎, 01-07-2016 03:12 AM
    • Replies: 0
    • Views: 923
    01-07-2016, 03:12 AM Go to last post
  15. The famous cereal box prizes puzzle

    One version says that a cereal company puts four different prizes one in each of all their boxes. The prizes are evenly distributed. How many...

    Started by arkane‎, 10-01-2010 02:33 AM
    • Replies: 0
    • Views: 4,454
    10-01-2010, 02:33 AM Go to last post
  16. probability poisson distributed

    hi can somebody help me with this question please.

    Started by arkeed178‎, 08-29-2014 06:52 AM
    • Replies: 5
    • Views: 2,160
    09-01-2014, 10:25 AM Go to last post
  17. Matching sets on Dice

    For those of you who know dice, I have this question: You roll multiple dice (with the same number of sides), what are the chances of getting...

    Started by ArmoredThirteen‎, 01-08-2011 05:43 PM
    dice
    • Replies: 6
    • Views: 5,080
    01-25-2011, 01:05 AM Go to last post
  18. second order stochastic dominance for convex functions

    Hi, To gain better understanding of second-order stochastic dominance I am trying to replicate some basic proofs. The proof of `standard' SSD...

    Started by Arnoud‎, 08-22-2014 04:59 AM
    • Replies: 1
    • Views: 2,030
    08-22-2014, 12:25 PM Go to last post
  19. Question Finding the max and min P-value from an F-tets

    There is a following task in my econometrics HW: 1) I have 25 values of the {X} random value. First I find the variation, then the estimation for...

    Started by Artemy Piskarev‎, 09-28-2011 03:54 AM
    • Replies: 7
    • Views: 8,961
    09-30-2011, 07:28 AM Go to last post
  20. help!

    Suppose a population has a mean of 90 and a standard deviation of 28. If a random sample of size 49 is drawn from the population, the probability of...

    Started by arthurshaw‎, 04-09-2013 09:59 PM
    • Replies: 2
    • Views: 2,163
    04-11-2013, 04:02 PM Go to last post
  21. Question Probability with Poker Hands, Please Help!

    Hi everyone, I joined the forum just to ask this question about one issue I'm having with probability. Your help is much appreciated. I already...

    Started by artife‎, 11-01-2016 09:21 PM
    • Replies: 0
    • Views: 2,416
    11-01-2016, 09:21 PM Go to last post
  22. My article on runs testing random bit sequences

    The article is here: http://home.ptd.net/~artnpeg For smaller values of the mean, the Poisson Distribution with cumulative sums is used. For larger...

    Started by ArtK‎, 09-04-2014 05:12 AM
    • Replies: 0
    • Views: 1,245
    09-04-2014, 05:12 AM Go to last post
  23. Brain Teaser

    It's here:http://www.braingle.com/palm/teaser.php?id=29228&comm=1 I thought that surely the answer must be 0.5 until I considered writing a test...

    Started by ArtK‎, 09-06-2014 08:47 AM
    • Replies: 11
    • Views: 3,258
    09-08-2014, 11:43 PM Go to last post
  24. bizarre distributions

    Perhaps some expert here can shine some light on the strange results I've been experiencing lately. I wanted to explore the idea of creating a...

    Started by ArtK‎, 10-28-2014 08:59 AM
    • Replies: 0
    • Views: 1,270
    10-28-2014, 08:59 AM Go to last post
  25. My web pages on finding probabilites of runs

    I now have several pages up on the topic. The starting page is: http://home.ptd.net/~artnpeg/RUNS.html I cover derivations of algorithms, js and...

    Started by ArtK‎, 03-30-2015 07:48 AM
    • Replies: 0
    • Views: 1,273
    03-30-2015, 07:48 AM Go to last post
  26. My program TARGETS

    I used a Monte Carlo method of finding probabilities of collisions between a randomly tossed circular block and non-overlapping randomly placed...

    Started by ArtK‎, 06-03-2015 02:42 PM
    • Replies: 0
    • Views: 809
    06-03-2015, 02:42 PM Go to last post
  27. Expected time until absorption in a Markov chain with two absorbing states

    Dear all In my discrete time Markov chain (figure attached as attachment) two absorbing states namely "Isolate" and "Reset". The processes start...

    Started by arun227‎, 04-16-2012 01:45 AM
    • Replies: 1
    • Views: 2,012
    04-16-2012, 03:12 AM Go to last post
  28. Unhappy Probability Question..urgent

    Can somebody help me by solving the below mentioned proble? A survey reports that 62% of callers to a help desk complain about the service if...

    Started by arun_899‎, 08-27-2010 05:08 AM
    • Replies: 5
    • Views: 3,509
    08-27-2010, 10:00 AM Go to last post
  29. finding probabilty

    Consider a country in which 100, 000 people vote in an election. There are only two candidates on the ballot; a Democratic candidate (denoted D) and...

    Started by arun_jj‎, 10-01-2013 11:34 PM
    probabilty
    • Replies: 3
    • Views: 1,857
    10-02-2013, 12:46 AM Go to last post
  30. Express similarity measure in terms of probability

    Hi, I have an image called 'source.png'. And a set (lets call it set-1) of images called 'target-i.png' (where i:1-10). I need to find which of...

    Started by aryabhatta‎, 04-15-2016 05:58 PM
    • Replies: 0
    • Views: 1,342
    04-15-2016, 05:58 PM Go to last post
  31. Necessary to check normality of definitively non-normal data sets?

    hi, i'm working with data sets that are not normally distrubuted, and do not respond with normality to transformations (log, sqrt, z-score). they...

    Started by as123‎, 10-08-2009 12:33 PM
    • Replies: 0
    • Views: 2,334
    10-08-2009, 12:33 PM Go to last post
  32. formula of parabola

    Hi what is formula of parabola? thanks

    Started by asangari‎, 11-07-2011 11:16 AM
    • Replies: 1
    • Views: 2,536
    11-07-2011, 11:19 AM Go to last post
  33. maximum of parabola

    Hi who determine maximum of parabola? thanks

    Started by asangari‎, 11-07-2011 11:20 AM
    • Replies: 5
    • Views: 3,449
    11-07-2011, 12:14 PM Go to last post
  34. maximum of function?

    Hi who determine maximum of function? thanks

    Started by asangari‎, 11-07-2011 11:22 AM
    • Replies: 1
    • Views: 2,534
    11-07-2011, 11:36 AM Go to last post
  35. Density of data

    Hi What is the Density of data? I like understand this concept with data example? thanks

    Started by asangari‎, 01-09-2012 04:23 PM
    • Replies: 3
    • Views: 2,579
    01-09-2012, 08:57 PM Go to last post
  36. Question Mixed Poisson Distribution Help

    Question: The number of accidents follows a Poisson distribution with mean 12. Each accident generates 1, 2 or 3 claimants with probabilities...

    Started by Asano‎, 02-25-2015 11:56 AM
    actuarial, homework help, probability, statistics
    • Replies: 1
    • Views: 1,166
    02-25-2015, 02:12 PM Go to last post
  37. Question Poisson Distribution with two different expected value

    Question: Suppose there are number of accidents at location A and location B each day with Poisson Distribution with rate 0.001 and the number of...

    Started by Asano‎, 02-25-2015 12:03 PM
    mixed distribution, poisson distribution, probability, statistics
    • Replies: 2
    • Views: 1,493
    02-26-2015, 07:38 AM Go to last post
  38. Normal Approximation to the Binomial Distribution

    Hello everyone. So, I was trying to solve some exercises on the normal distribution and the approximation of Normal to Binomial but I just can't...

    Started by asantos‎, 04-05-2015 04:30 PM
    • Replies: 0
    • Views: 1,405
    04-05-2015, 04:30 PM Go to last post
  39. calculation of distance using Kullback–Leibler divergence

    Hi, Basically I'm from biology back ground. So it may be a basic question for you. I have two plots for example plot1: X - axis values: ...

    Started by asd123‎, 03-03-2011 05:39 AM
    • Replies: 2
    • Views: 121,587
    03-03-2011, 09:39 AM Go to last post
  40. Comparing Gaussian curves

    Hi, I have two points A(30.333,100) and B(30.333151665,80) I need to draw Gaussian for each point separately and need to check their overlap...

    Started by asd123‎, 03-04-2011 04:28 AM
    • Replies: 7
    • Views: 9,158
    08-31-2011, 05:35 PM Go to last post
  41. Probability Help

    I'm having some trouble trying to figure this out: James is going to write an exam Suppose that if he hadn't passed in previous attempts, each...

    Started by asdfman‎, 10-17-2013 08:00 PM
    • Replies: 3
    • Views: 2,137
    10-18-2013, 01:16 AM Go to last post
  42. Conditional distribution

    Let X be a random variable. Given: -P(X = 1) = 1/2 -P(X = 2) = 1/2 -The conditional distribution of Y given X is an exponential with rate X. ...

    Started by asdfman‎, 12-05-2013 05:14 AM
    • Replies: 1
    • Views: 1,108
    12-05-2013, 06:14 AM Go to last post
  43. Is this 2 sided or a 1 sided test

    Hello everyone! I am new to Hyposthesis Testing. Suppose my H_0 ( Null Hypothesis ) is : mu =1 I understand that H_1 : mu >1 or H_1 mu<1 are...

    Started by ashim‎, 11-01-2008 10:27 PM
    • Replies: 2
    • Views: 4,045
    11-01-2008, 11:44 PM Go to last post
  44. goodness of fit , 1 sided or 2 sided?

    Hello everyone, I am reading about " accuracy " of the Chi squared test. Now we have the following : - P( X=i ) = 1/6 for all i = 1(1)n ...

    Started by ashim‎, 11-02-2008 10:14 AM
    • Replies: 1
    • Views: 3,476
    11-02-2008, 11:24 AM Go to last post
  45. Gamma Difference Distribution

    What is the distribution of the difference of two gamma distributions with same scale parameter, and shape parameter of the first one is k(1+e), e ->...

    Started by ashish1789hota‎, 09-19-2011 09:19 AM
    gamma distribution
    • Replies: 1
    • Views: 4,470
    09-19-2011, 10:43 AM Go to last post
  46. Triangular distribution

    Hi all, I have a quick question and I hope you can address that. if I have two uniformly distributed variables x~ and y~ what would be the...

    Started by ashraf‎, 08-08-2015 01:08 AM
    • Replies: 1
    • Views: 1,183
    08-08-2015, 02:41 AM Go to last post
  47. autoregressive

    hi folks, i am using 2nd order autoregressive for prediction. my equation is y(t)=b1 + b2*y(t-1) + b3*y(t-2). i found the coefficients b1,...

    Started by ashraf_leaf‎, 08-12-2008 10:37 AM
    • Replies: 3
    • Views: 1,901
    08-13-2008, 11:14 AM Go to last post
  48. conditional probability and trial of experiments

    Consider a medical test for a disease, D. The test mostly gives the right answer, but not always. Say its false-negative rate is 1% and its...

    Started by asif‎, 05-14-2013 05:09 AM
    conditional probabilities, false negative, false positives, trial
    • Replies: 2
    • Views: 1,403
    05-15-2013, 07:43 AM Go to last post
  49. Hypergeometric Distribution

    For part (b), the solution is from the textbook solution from the book. k = 1, so why did they set it up like that? Look at the image to see what I...

    Started by asilvester635‎, 02-21-2016 03:14 PM
    • Replies: 2
    • Views: 1,235
    02-22-2016, 02:13 AM Go to last post
  50. probability density function

    I am having difficulty resolving the two exercises below 1)Consider the function Find the E(X). I now is a Poisson(y), but i don't know how to...

    Started by askazy‎, 09-28-2014 04:00 PM
    • Replies: 0
    • Views: 1,263
    09-28-2014, 04:00 PM Go to last post
  51. Distribution

    Hello, I having doubts on this issue 1) If X~Gamma(a,B) and Y~Beta(γ,B-γ), respectively with B>= 0 and γ>= 0, such that γ <= B. Which...

    Started by askazy‎, 11-21-2014 09:11 AM
    • Replies: 10
    • Views: 2,155
    11-22-2014, 04:56 PM Go to last post
  52. Convergence

    If Z_n = \frac{1}{n}*\sum_{i=1}^nX_i^2 where X_i=N(\mu,\sigma^2) 1) Show that Z_n \rightarrow^p \mu^2+\sigma^2(convergence in probability) I...

    Started by askazy‎, 12-03-2014 04:50 PM
    • Replies: 12
    • Views: 2,214
    12-06-2014, 10:46 AM Go to last post
  53. Convergence in probability

    If Z_n=\frac{1}{n}\sum_{i=1}^nX_i^2 and W_n=\frac{1}{n}\sum_{i=1}^n(X_i-\bar{X})^2 Show that V_n=Z_n - W_n \rightarrow^p \mu^2 What I think:...

    Started by askazy‎, 12-05-2014 11:21 AM
    • Replies: 6
    • Views: 1,198
    12-05-2014, 04:09 PM Go to last post
  54. Strong Law of Large Numbers

    If X_n is a sequence of random variables and Cov(X_i,X_j)=0 for all i,j and Var(X_j)\leq c for all j. Show that X_n satisfies the strong law of large...

    Started by askazy‎, 12-05-2014 07:13 PM
    • Replies: 2
    • Views: 1,575
    12-06-2014, 10:46 AM Go to last post
  55. Markov Inequality

    If X_1,X_2,X_3...X_{20} are independent random variables with common distribution Poisson(1). Find with markov inequality a upper limit for...

    Started by askazy‎, 12-06-2014 03:00 PM
    • Replies: 6
    • Views: 1,464
    12-06-2014, 04:58 PM Go to last post
  56. Central Limit Theorem

    If X is a Gamma(n,1). For which values of n we have P(|\frac{X}{n}-1|>0.01)<0.1 If n=n_0 is the first value of n that satisfies the above equation,...

    Started by askazy‎, 12-06-2014 10:55 AM
    • Replies: 3
    • Views: 1,799
    12-08-2014, 06:25 AM Go to last post
  57. Convergence in Distribution

    If X_n is a sequence of random variables independent and X_n is Binomial(n,p) with 0<p<1 and either T_n=\frac{X_n}{n} for all n 1) Show that...

    Started by askazy‎, 12-06-2014 05:50 PM
    • Replies: 3
    • Views: 1,175
    12-07-2014, 11:08 AM Go to last post
  58. Conditional density, bivariate normal

    Let Z=X+Y where X \sim N(\mu,\sigma^2) and Y \sim N(0,1) are independent. What is the conditional density of X given Z, f_{X|Z}(x|z)? I already...

    Started by askazy‎, 06-09-2015 09:26 PM
    bivariate normal, conditional density
    • Replies: 3
    • Views: 1,363
    06-10-2015, 05:51 AM Go to last post
  59. Book for stochastic processes

    I need a good reference to learn these topics 1. Markov Chains in discrete time. 1.1. Classification of states, recurrence notions of...

    Started by askazy‎, 07-07-2015 05:58 PM
    • Replies: 4
    • Views: 1,571
    07-22-2015, 01:23 PM Go to last post
  60. Question Continuous joint entropy with fully dependent variable

    Consider a variable X with a continuous uniform distribution in the interval and a variable Y that is fully dependent on X, i.e., p(Y=y |...

    Started by ASML‎, 04-11-2015 04:59 PM
    dependence, entropy, joint distribution
    • Replies: 0
    • Views: 1,258
    04-11-2015, 04:59 PM Go to last post

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