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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: 30,334
    09-30-2005, 09:44 AM Go to last post
  1. Comparison of variability of synthetic and real data

    Hello, I'm trying to compare a real dataset with a random (synthetic) distribution to determine whether a pattern I see in the data is real or the...

    Started by Dafrst‎, 02-05-2014 03:36 PM
    bootstrap, random sampling, variability
    • Replies: 0
    • Views: 1,261
    02-05-2014, 03:36 PM Go to last post
  2. comparison with normal distribution truncated

    Hello, I would to know how to calculate the probability that X > Y when Y is greater than a given value p (X and Y are random variable following...

    Started by pascal34‎, 06-03-2014 10:49 AM
    gaussian distribution
    • Replies: 7
    • Views: 1,847
    06-04-2014, 06:53 AM Go to last post
  3. Competition scoring problem

    Not a homework question; a real scenario that I think should be determinable but I don't know how to... x number of people will enter a poker...

    Started by GRM‎, 08-22-2010 02:15 PM
    • Replies: 0
    • Views: 2,093
    08-22-2010, 02:15 PM Go to last post
  4. Complements, Unions, and Intersections

    Help!:shakehead In a market research survey participants were asked if they put ketchup directly on their fries or along side. 26% of men said...

    Started by tmwawa‎, 01-28-2007 12:09 PM
    • Replies: 4
    • Views: 4,211
    01-28-2007, 01:57 PM Go to last post
  5. Complex probability relating to NYC taxi cabs

    There are 13,000 taxi cabs in New York City. Let's say I have taken 600 rides (each one in a random cab). What are the chances that I have...

    Started by mattcaps‎, 06-04-2013 09:57 PM
    • Replies: 5
    • Views: 2,326
    12-30-2013, 10:21 AM Go to last post
  6. Complex question of combinatorial probability

    I would like to know if an equation exists or can be defined for computing the probability of drawing (at random from a population of elements) all...

    Started by Pwestcitt‎, 12-23-2012 04:17 AM
    • Replies: 5
    • Views: 1,620
    12-25-2012, 05:32 AM Go to last post
  7. Complicated Probability

    Q1. Suppose that four regular 6-sided dice are flipped. 1.What is the probability of a "three-of-a-kind" that is, three of the dice show the same...

    Started by mesha‎, 11-23-2011 12:08 AM
    • Replies: 1
    • Views: 1,819
    11-23-2011, 01:53 AM Go to last post
  8. Complicated STATs problem

    Say I have five variables A, B, C, D and E that range anywhere from -11 to 11. Given that A,B,C and D occur before E and there is correlation,...

    Started by senthil196‎, 11-13-2008 12:58 PM
    • Replies: 0
    • Views: 2,702
    11-13-2008, 12:58 PM Go to last post
  9. Question Compound Distribution Hyper-Parameters

    Hi, If a compound distribution is made up of a gamma dist with parameters (a,b), and b is gamma-distributed so that its parameters are (c,d), such...

    Started by Snow64‎, 04-17-2016 06:42 PM
    distribution function, likelihhod function., optimization
    • Replies: 1
    • Views: 1,340
    04-18-2016, 01:57 AM Go to last post
  10. Compound Probability

    Hey guys, i am having a bit of trouble with this basic probability question which shows that i do not understand the basics at all. The question...

    Started by daandrew‎, 04-18-2015 11:39 AM
    baseball, compound probability, probability
    • Replies: 4
    • Views: 1,431
    04-26-2015, 10:01 AM Go to last post
  11. compromise between efficiency and accuracy

    Hi! Not sure I post in the right place, but maybe you can help, and some probabilities can be introduced in discussion for the following problem:...

    Started by sorin‎, 08-06-2015 10:36 AM
    random sample
    • Replies: 0
    • Views: 965
    08-06-2015, 10:36 AM Go to last post
  12. Compuite P{X < Y} conditioned on the value of Y; intuition behind it.

    Dear people, I have a question concerning the following steps to compute P{X < Y}. The steps shown are the following: P{X < Y} = \int P(X <...

    Started by Mkkl‎, 10-27-2013 04:26 AM
    • Replies: 1
    • Views: 1,442
    10-27-2013, 07:54 AM Go to last post
  13. Computer game log normally distributed

    I'm playing a computer game and I want to boost the high score. I assume that attempts are independent (say, you do not improve by playing), and in...

    Started by endlessend25‎, 11-29-2016 03:45 PM
    independence, log, self-study
    • Replies: 0
    • Views: 2,251
    11-29-2016, 03:45 PM Go to last post
  14. Computing a difficult expectation of a Gaussian r.v.

    I'd really appreciate any ideas that anyone could offer. Let X be a non-standard Gaussian random variable with mean a, variance b. Compute the...

    Started by sven svenson‎, 01-28-2011 03:18 PM
    • Replies: 2
    • Views: 2,942
    02-04-2011, 04:15 PM Go to last post
  15. Computing MLE estimate

    So I have so i'm stuck at taking the log :mad: can somoene help me ?

    Started by studentbelg‎, 12-01-2014 03:33 PM
    • Replies: 5
    • Views: 2,196
    01-06-2015, 01:17 PM Go to last post
  16. Computing pobabilities for any normal probability Dist.

    Greetings all, I am a math challenged individual in the middle of a stats class and (you've heard it before) seriously struggling with story...

    Started by 1Moretime‎, 10-14-2012 11:23 AM
    • Replies: 2
    • Views: 4,730
    10-14-2012, 03:23 PM Go to last post
  17. Computing probability

    fX(x)= (3/8)*x*x 0<x<2 fY(y)= 1/x x<y<2x P(1<y<3) Now how do i do this ? Do i have...

    Started by studentbelg‎, 08-28-2014 11:47 AM
    • Replies: 1
    • Views: 1,360
    08-29-2014, 03:47 AM Go to last post
  18. Computing probability density function

    If I know the probability distribution of two variables, say x and y, i.e. I know that P(x) and P(y) are both gaussian, how would I compute the P(R)...

    Started by bass_mouth‎, 06-28-2012 04:49 PM
    • Replies: 4
    • Views: 1,742
    07-01-2012, 11:17 PM Go to last post
  19. condi prob question, stuck

    if f(x,y)=3 from 0<x<1, 0<y<x. whats the conditional densiity function for fy(y|x<0.3)? i try to use bayer theorm and marginal density, but...

    Started by pzhao‎, 11-13-2013 08:13 PM
    • Replies: 1
    • Views: 1,367
    11-14-2013, 01:00 AM Go to last post
  20. condition expectation and variance

    Let X, Y be independent exponential random variables with means 1 and 2 respectively. Let Z = 1, if X < Y Z = 0, otherwise Find E(X|Z) and...

    Started by allrighty128‎, 01-25-2008 11:10 PM
    • Replies: 0
    • Views: 2,666
    01-25-2008, 11:10 PM Go to last post
  21. conditional binomial is a poisson distribution

    Hi, I'm fighting with this problem for a while. There is something important I'm missing So the problem goes like this X~Poisson(lambda) and Y|X=k...

    Started by exuberant‎, 12-24-2010 09:28 AM
    • Replies: 13
    • Views: 22,230
    10-21-2015, 04:01 PM Go to last post
  22. Question Conditional covariance

    X_i\sim Ber(\frac{1}{4}) and Y_i\sim Ber(\frac{3}{4}). Find Cov(\sum_{i=1}^{N} X_i,\sum_{i=1}^{N} Y_i) where P(N=k)=\frac{1}{2^k} for k=1,2,3,.... ...

    Started by Sambit‎, 05-13-2011 09:45 AM
    • Replies: 5
    • Views: 8,196
    05-15-2011, 10:09 AM Go to last post
  23. 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: 1,366
    06-10-2015, 05:51 AM Go to last post
  24. 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: 1,110
    12-05-2013, 06:14 AM Go to last post
  25. Conditional Distribution Expectation of E[Y^2]

    I understand that with the Conditional Distribution Expectation of E, it's E(E). How about E? Is the correct formula E(E)?

    Started by StatStudent3‎, 11-18-2010 11:34 PM
    • Replies: 1
    • Views: 4,165
    11-18-2010, 11:38 PM Go to last post
  26. Conditional distribution of 3 multivariate normal distribution vairables

    what is the conditional distribution of variable a, given that u know b and c, if a,b,c obey multivariate normal density?

    Started by statman1‎, 07-31-2016 02:54 AM
    • Replies: 3
    • Views: 1,600
    07-31-2016, 12:20 PM Go to last post
  27. Conditional distribution of transformed variables

    Hi, I'll appreciate if someone can help me figure out the following problem: Let \Theta,E_1,E_2 be all real-valued random variables. E_1 and E_2...

    Started by statbo‎, 12-11-2010 05:57 PM
    • Replies: 1
    • Views: 2,931
    12-25-2010, 02:04 PM Go to last post
  28. Conditional Distribution over the unit Disk

    Suppose the Random Variables U and V are uniform (-1,1). How can I show that their conditional distribution, given U^2+V^2 <1 , is ...

    Started by JohnK‎, 01-13-2014 08:37 AM
    • Replies: 2
    • Views: 1,555
    01-14-2014, 09:28 AM Go to last post
  29. Conditional ev,big problem with definition

    I jus dont seem to understand this concept "conditional e.v." I do know the definitions: joint density f_X,Y , conditional density of X given Y=y,...

    Started by corneel‎, 08-27-2010 09:38 PM
    • Replies: 3
    • Views: 3,107
    08-28-2010, 12:26 PM Go to last post
  30. Conditional expectation

    Good afternoon, I have to calculate the expected value of a logistic distribution given that the values are above a given constant (lets say 0). So...

    Started by bizan‎, 06-12-2012 08:06 AM
    conditional expectation, expected value, logistic
    • Replies: 1
    • Views: 3,975
    06-14-2012, 04:58 PM Go to last post
  31. Conditional Expectation

    I will keep it simple... Suppose the Joint PMF is: 1/2 x = -4, y = 1 1/2 x = 6, y = 7 I have already computed several actual values for...

    Started by simplemts‎, 10-13-2012 06:10 PM
    • Replies: 1
    • Views: 1,307
    10-14-2012, 12:04 PM Go to last post
  32. conditional expectation and variance

    Hi there, Suppose X~Exp(lam). We have a sample from X of size n. Knowing that the data follow the exponential diastribution, we fit the...

    Started by leo nidas‎, 02-09-2009 12:12 PM
    • Replies: 4
    • Views: 4,679
    02-09-2009, 01:54 PM Go to last post
  33. conditional expectation behaviour

    Hi, I had an exam the other day and I had to prove if some function was a martingale or not. I donīt remember it accurately, but I do remember I got...

    Started by stoch.Prozesse‎, 03-02-2009 09:45 AM
    • Replies: 0
    • Views: 2,578
    03-02-2009, 09:45 AM Go to last post
  34. conditional expectation given sum

    Hello, I need your help. Suppose: X\sim N(0,\sigma^2_x), Y\sim N(0,\sigma^2_y) , X, Y are independent, and c\in R. I need to find an...

    Started by dan25‎, 07-28-2016 03:58 PM
    • Replies: 0
    • Views: 2,250
    07-28-2016, 03:58 PM Go to last post
  35. Conditional Expectation Problem

    Hi all I need to solve the following problem: If E(X|Y)=Y and E(Y|X)=X, prove that X=Y almost surely. Seems like I'll need to use the...

    Started by symmetry‎, 03-25-2011 10:18 PM
    • Replies: 5
    • Views: 4,753
    03-26-2011, 12:36 PM Go to last post
  36. Conditional Expectation problem

    Consider n multinomial trials, where each trial independently results in outcome i with probability p_i,\sum_{i=1}^{k}p_{i}=1. With X_i equal to the...

    Started by downthesun01‎, 08-04-2011 03:53 AM
    • Replies: 2
    • Views: 3,405
    08-08-2011, 03:09 AM Go to last post
  37. Conditional Expectation Problem

    Hi everyone, I have the following problem to solve and I would appreciate if someone could give me a hint on how to tackle it. Thank you in...

    Started by M4rkov‎, 12-22-2011 07:07 AM
    • Replies: 3
    • Views: 1,903
    12-22-2011, 01:55 PM Go to last post
  38. Conditional expectation question

    Hey, I would really appreciate your help with the following question: X and Y each has a uniform distribution on and the two are independent....

    Started by busstud123‎, 03-01-2010 12:10 PM
    • Replies: 8
    • Views: 5,416
    03-06-2010, 02:46 AM Go to last post
  39. Conditional Expectation question

    My final is on Mon, and I got this HW problem wrong from last week, and I still don't understand why. An item is selected randomly from a...

    Started by StatStudent3‎, 12-09-2010 10:23 PM
    • Replies: 6
    • Views: 6,334
    12-21-2010, 07:11 AM Go to last post
  40. Smile Conditional expectation, normal distributions

    I'm having some trouble with the following problem: Problem: Let X and Y be independent N(0,1) random variables. Determine E(X|X>Y) My...

    Started by saubersbox‎, 06-27-2013 02:18 PM
    • Replies: 4
    • Views: 7,902
    06-27-2013, 05:38 PM Go to last post
  41. Conditional expectation, three exponential distributed r.v.

    First post... Let A, B and C be independent exponential distributed random variables with parameters lambda_A, lambda_B and lambda_C,...

    Started by Ego7894612‎, 08-27-2010 04:08 PM
    • Replies: 2
    • Views: 2,575
    08-27-2010, 07:20 PM Go to last post
  42. Conditional Expected Value

    Given: x = N(0,1) y = N(0,1) z = N(0,1) *x,y, and z are statistically independent That is, x, y, and z are all normally distributed with mean 0...

    Started by shmiv04‎, 03-29-2009 09:20 PM
    • Replies: 3
    • Views: 3,617
    03-30-2009, 01:09 AM Go to last post
  43. Conditional expected value

    I have two possibilities; X1 and X2. The question is: If you know that X1 gives you 0 then what does X2 give you? I set up a table: X2: 2 0 ...

    Started by mandarine‎, 09-25-2009 02:26 PM
    • Replies: 3
    • Views: 2,495
    09-26-2009, 05:58 AM Go to last post
  44. conditional expected value #2

    I have two possibilities; X1 and X2. I set up a table: X2: 2: 0: -2 : X1: 0 : 0.1 0.2 0.1 -2: 0.0 0.3 0.3 Then I found: Px1(0)...

    Started by mandarine‎, 09-26-2009 05:54 AM
    • Replies: 4
    • Views: 2,973
    09-27-2009, 10:57 AM Go to last post
  45. Exclamation conditional independence

    hello, I would like to ask the following: I have 3 random variables X , Y and Z. If I know that X is independent of Y given Z then does this...

    Started by michinerd‎, 10-29-2014 12:38 PM
    conditional, conditional independence, independance, probability
    • Replies: 3
    • Views: 1,494
    10-29-2014, 02:57 PM Go to last post
  46. Question Conditional Mean & Variance

    I always get into trouble when dealing problems of conditional distribution:( please help :wave: Let Y be the number of heads obtained by tossing...

    Started by TYW‎, 12-05-2011 07:00 AM
    • Replies: 8
    • Views: 3,429
    12-06-2011, 11:15 AM Go to last post
  47. conditional mean of a lognormal variable

    Hi, does anyone know whether there exists a code or program to calculate the conditional mean of a lognormal variable, e.g. E? Thanks, tarama

    Started by tarama‎, 06-06-2006 11:03 AM
    • Replies: 0
    • Views: 3,150
    06-06-2006, 11:03 AM Go to last post
  48. Conditional Monthly Risk Calibration for a trading model

    Hi, I have a trading system with a portfolio of assets (long and shorts) with daily market returns. I want to overlay a risk management to my...

    Started by system2016‎, 10-13-2016 12:13 PM
    probability, risk calibration, trading system
    • Replies: 0
    • Views: 2,102
    10-13-2016, 12:13 PM Go to last post
  49. Conditional multivariate

    Strangely, I am not sure about something very simple... I know that by definition, P(X1 | X2,X3) = P(X1,X2,X3) / P(X2,X3) But is this also...

    Started by omrit‎, 02-15-2011 05:09 AM
    • Replies: 1
    • Views: 3,232
    02-15-2011, 10:18 AM Go to last post
  50. conditional normal distribution

    Hi all First of all, I am new here but I am not new to statistics. But I need your help:cool: I do have a multivariate normal distribution:...

    Started by jstar‎, 10-22-2007 04:23 AM
    • Replies: 1
    • Views: 3,128
    10-22-2007, 08:38 AM Go to last post
  51. conditional normal distribution

    dear all, i have the following question that i don't get my head around. suppose x1 and x2 are jointly normally distributed. i am interested in...

    Started by michael27‎, 01-26-2012 02:38 PM
    • Replies: 1
    • Views: 3,971
    02-19-2012, 04:51 PM Go to last post
  52. Conditional normal implying independence

    So reading a book someone comment that e \lvert x \sim N(0,1) hence e is independent of x. Why is this the case? Trying to prove this to myself...

    Started by JesperHP‎, 01-03-2015 12:59 PM
    • Replies: 1
    • Views: 1,680
    01-06-2015, 05:19 AM Go to last post
  53. Conditional Proabability - Please Help!!!

    Hello, let X, Y, Z be 3 random variables. how to express the conditional probability P in terms of P and P?

    Started by vladisland‎, 06-15-2009 09:26 AM
    • Replies: 0
    • Views: 2,294
    06-15-2009, 09:26 AM Go to last post
  54. Conditional prob question - Is my answer correct

    I wondered if someone could confirm my workings... In a certain sports club, 32 % of members play football, 31 % of members play baseball, and 23...

    Started by Dojo‎, 10-28-2011 11:48 AM
    • Replies: 0
    • Views: 1,674
    10-28-2011, 11:48 AM Go to last post
  55. conditional probabilities

    P(A)= 0.3 P(B)= 0.5 find P(A union B) if: a) P(B|A)= 0.25 b) A is a subset of B i just need hints to solving these two, not looking for the...

    Started by subopolois‎, 02-04-2009 11:30 PM
    • Replies: 2
    • Views: 2,058
    02-06-2009, 04:12 PM Go to last post
  56. Conditional Probability

    To reduce theft, the ABCD Company screens all its employees with a lie detector test that is known to be correct 90 percent of the time (for both...

    Started by quark‎, 10-30-2005 11:59 PM
    • Replies: 0
    • Views: 7,528
    10-30-2005, 11:59 PM Go to last post
  57. Conditional Probability

    Hey I'm sorry this problem is kind of long, but I really cannot figure it out. The advantage of your experimental blood test is that 95% of the...

    Started by johndoe‎, 01-27-2006 06:13 PM
    • Replies: 2
    • Views: 3,712
    01-30-2006, 08:35 PM Go to last post
  58. Conditional Probability

    I am having a very hard time with this one problem, I did a search on the site but came up empty so I'm sorry if this is a repost. Last semester,...

    Started by Spiff321‎, 10-19-2008 03:30 PM
    • Replies: 2
    • Views: 2,367
    10-19-2008, 04:49 PM Go to last post
  59. Conditional Probability

    Let A and B be events such that P(A)=0.2, P(B)=0.3, and P(A|B)=0.1. What is P(A|B^c)? (i.e. what is B complement?) Answer is 0.243, but I have no...

    Started by the_chemist‎, 01-06-2011 04:54 PM
    conditional, probability
    • Replies: 1
    • Views: 2,406
    01-06-2011, 05:08 PM Go to last post
  60. Conditional Probability

    In order to be qualified for a job, a candidate need to pass 3 exams. If a candidate fail an exam, he can't take the next one. A random candidate...

    Started by Yankel‎, 11-26-2011 04:06 PM
    • Replies: 8
    • Views: 3,090
    12-06-2011, 08:13 PM Go to last post

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