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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: 30,361
    09-30-2005, 09:44 AM Go to last post
  1. Stats homework help NYS

    New York Stock Exchange. Suppose that the percentage returns for a given year for all Stocks listed on the New York Stock Exchange follows a...

    Started by bonfar10‎, 10-22-2014 02:20 PM
    • Replies: 0
    • Views: 1,280
    10-22-2014, 02:20 PM Go to last post
  2. Proof for Pooling

    Hello all, I have a research question regarding pooling probability data. The application is population genetics. Assume we have a population of...

    Started by Bonhomme‎, 01-02-2008 03:09 PM
    • Replies: 0
    • Views: 2,404
    01-02-2008, 03:09 PM Go to last post
  3. Dirichlet distribution - moments (mean and variance)

    For a Dirichlet variable, I know the means and covariances, that is, E = \alpha_i/\alpha_0 Cov =\frac{ \alpha_i (\alpha_0 I -...

    Started by boot20‎, 10-28-2011 05:29 PM
    • Replies: 12
    • Views: 11,842
    02-14-2012, 10:56 AM Go to last post
  4. Is a subset of a normal distribution normal?

    An easy one for some of you guys here I suspect. Thanks to anyone who can help me with it. I have an application which adds a normally...

    Started by bordonbert‎, 10-27-2009 10:39 AM
    • Replies: 4
    • Views: 10,357
    10-29-2009, 03:54 AM Go to last post
  5. How to use Weibull statistics?

    My problem is the following. I have the results of mechanical (tensile) tests performed at different temperatures. I found that below certain...

    Started by BorisM‎, 09-06-2013 02:58 AM
    • Replies: 1
    • Views: 1,295
    09-06-2013, 10:29 AM Go to last post
  6. Homework Problem

    Hi, I am a beginner in statistics, and can't figure out this problem: "In a highly publicized murder trial it was estimated that 25 percent of the...

    Started by bornconfused‎, 03-27-2011 01:12 AM
    anomaly, one-proportion test
    • Replies: 3
    • Views: 4,772
    03-31-2011, 12:47 AM Go to last post
  7. Pub Probability Question

    Hi, We were discussing the following in the pub and its frustrating me because I can't figure out the answer (15 years on from a maths degree), I...

    Started by boro123‎, 06-14-2008 04:38 AM
    • Replies: 3
    • Views: 2,538
    06-17-2008, 11:42 AM Go to last post
  8. One problem - two approaches, two different answers

    A test is based upon the average of 5 results. Assuming only random errors in measurement, what is the probability the data is trended (sequential...

    Started by BoSachok‎, 03-20-2015 12:52 PM
    • Replies: 0
    • Views: 1,159
    03-20-2015, 12:52 PM Go to last post
  9. Joint probability distribution

    1. An instructor has given a short test consisting of two parts. For a randomly selected student, let X = the number of points earned on the rst part...

    Started by boydale1‎, 10-11-2009 05:05 PM
    • Replies: 1
    • Views: 10,850
    10-11-2009, 07:28 PM Go to last post
  10. Help me solve this probability question

    The owner of a petrol station wished to determine the proportion of customers who use a credit card to pay at the pump. He surveyed 200 customers and...

    Started by boys8goods‎, 07-06-2011 04:13 PM
    • Replies: 2
    • Views: 2,097
    07-06-2011, 04:32 PM Go to last post
  11. Game Entry Statistics

    I am trying to figure out the method of calculating the number of times that a certain game must be entered in order to advance to a specific level...

    Started by bpbenda‎, 08-02-2010 02:57 PM
    • Replies: 3
    • Views: 3,204
    08-09-2010, 01:54 AM Go to last post
  12. Probability Simulation Software Recommendation

    I am looking for software recommendations that will allow me to define a known multi-level game for the purposes of running simulations to determine...

    Started by bpbenda‎, 08-14-2010 08:10 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 9,017
    08-19-2010, 10:59 AM Go to last post
  13. Probability of a Time Game in Ruzzle

    I am not a statistic savant, but I am mathematically minded. My friend asked me today what I thought the odds were of a game of Ruzzle ending in a...

    Started by bpbenda‎, 06-17-2013 03:20 PM
    • Replies: 1
    • Views: 2,998
    06-17-2013, 03:25 PM Go to last post
  14. Group Probability Problem

    Hi, I'm having a difficult time figuring out an approach to a problem and could use some help -- if I have a team of 5 basketball players, each...

    Started by bprs0713‎, 12-18-2014 08:40 PM
    • Replies: 3
    • Views: 1,579
    12-19-2014, 01:31 PM Go to last post
  15. Post Probability for a CHi-square, normal, and binomial in Excel.

    Never mind...

    Started by Braam‎, 01-23-2016 07:29 AM
    • Replies: 0
    • Views: 1,089
    01-23-2016, 07:29 AM Go to last post
  16. Seeking help with a condition probability question

    Hello, I have measurements of 3 variables (1) Journey start time (2) Distance travelled (3) Journey Time. I am looking to work out the...

    Started by bradyj2‎, 06-22-2012 05:48 AM
    • Replies: 0
    • Views: 1,206
    06-22-2012, 05:48 AM Go to last post
  17. Markov chain transition probability matrix

    Hi there, I'm trying to understand markov chains and transition probability matrices. I have a recording of time (1, 2,, 3 second etc), velocity...

    Started by bradyj2‎, 08-16-2011 10:19 AM
    • Replies: 1
    • Views: 3,020
    08-16-2011, 12:00 PM Go to last post
  18. converting a frequency matrix to a transition probability matrix

    Hi there, I have speed and power in two columns. Each speed, power point is a referred to as a state. I've created a frequency matrix showing...

    Started by bradyj2‎, 09-09-2011 05:38 AM
    • Replies: 0
    • Views: 4,005
    09-09-2011, 05:38 AM Go to last post
  19. Combining 2 transitional probability matrices?

    Hello, How would you/or is it possible to combine two transitional probability matrices? Say for example I have 2 matrices that both measure...

    Started by bradyj2‎, 02-21-2012 11:37 AM
    • Replies: 7
    • Views: 2,125
    02-22-2012, 07:21 AM Go to last post
  20. States of a Transition probability matrix

    Hi there, I have a question about the states on a Markov chain that I was hoping some one might be able to explain to me. Say for instance...

    Started by bradyj2‎, 02-06-2012 11:48 AM
    • Replies: 0
    • Views: 3,293
    02-06-2012, 11:48 AM Go to last post
  21. States of a Markov Chain question?

    Hello all, I would be grateful if somebody could advise me or comment on a Markoc Chain question that I have. It is with regards to the state...

    Started by bradyj2‎, 02-21-2012 07:36 AM
    • Replies: 0
    • Views: 1,347
    02-21-2012, 07:36 AM Go to last post
  22. Transform random variables to uniforms using their CDF

    Hello, I researching the Joint Normal Transform methodology. I only have a basic statistics. How would you transform a random variable to its...

    Started by bradyj2‎, 04-02-2012 05:53 AM
    • Replies: 2
    • Views: 2,315
    12-11-2013, 07:09 PM Go to last post
  23. modelling departure time probability on consecutive days with copula function

    Hello, I have data of the departure and arrival time of cars from their home. These stochastic variables are modelled using a normal copula...

    Started by bradyj2‎, 05-17-2012 11:46 AM
    • Replies: 0
    • Views: 1,546
    05-17-2012, 11:46 AM Go to last post
  24. Using a copula function when one of the correlations is not significant

    Hello, I have 4 variables: 1. Departure Time from Home 2. Distance travelled during the day 3. The number of trips made during the day 4....

    Started by bradyj2‎, 06-04-2012 12:15 PM
    • Replies: 4
    • Views: 2,368
    06-05-2012, 04:07 AM Go to last post
  25. How to generate a certain number of random numbers from a gamma distribution that sum

    Hello, Would anybody be able to advise me or tell me how you could generate a certain number of random numbers from a gamma distribution that sum...

    Started by bradyj2‎, 06-21-2012 03:42 PM
    • Replies: 1
    • Views: 2,050
    06-21-2012, 05:57 PM Go to last post
  26. Conditional probability Question

    Hello, I'm trying to work out a conditional probability. I have two measurements of two variables (1) Start Time and (2) Distance. I've...

    Started by bradyj2‎, 06-22-2012 07:21 AM
    • Replies: 1
    • Views: 1,350
    06-22-2012, 10:31 AM Go to last post
  27. Determining the probability of an electric car charging station being available?

    Hi there, I'm just wondering if anybody would know of a way of determining the probability of an event. I trying to figure out how I could...

    Started by bradyj2‎, 06-27-2012 09:29 AM
    • Replies: 0
    • Views: 1,025
    06-27-2012, 09:29 AM Go to last post
  28. Stick breaking constriction probability

    Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

    Started by bradyj2‎, 07-24-2012 08:02 AM
    • Replies: 0
    • Views: 1,403
    07-24-2012, 08:02 AM Go to last post
  29. Conditional probability Question

    Hi Guys, Could I ask a question with regards to probability theory? I have recorded some journey distances for cars. Here is an example. The...

    Started by bradyj2‎, 07-24-2012 08:55 AM
    • Replies: 1
    • Views: 1,249
    07-26-2012, 01:35 PM Go to last post
  30. Question about a monte carlo simulation of car travel patterns

    Hi there, I have a question about probability, conditional expectations, copula functions and their use in a Monte carlo simulation. I'd...

    Started by bradyj2‎, 09-12-2012 08:13 AM
    • Replies: 0
    • Views: 1,228
    09-12-2012, 08:13 AM Go to last post
  31. Conditional probability question

    Hi there, I have the journey times of 2 journeys. Would somebody be able to show me by way of example how to calculate the conditional...

    Started by bradyj2‎, 09-18-2012 09:26 AM
    • Replies: 0
    • Views: 983
    09-18-2012, 09:26 AM Go to last post
  32. Bayesian probability question about Dirichlet prior distributions

    Hi there, I have a question about Bayesian probability. I have a list of the starting times of journeys. I binned the data into 15 minute...

    Started by bradyj2‎, 10-15-2012 12:03 PM
    • Replies: 2
    • Views: 1,704
    10-16-2012, 03:38 AM Go to last post
  33. continuous and discrete variables with a copula?

    Hi, I have 3 correlated variables that I wish to model with a copula function. 2 of the variables are continuous and 1 is discrete. My...

    Started by bradyj2‎, 11-02-2012 07:29 AM
    • Replies: 1
    • Views: 1,975
    11-02-2012, 10:29 PM Go to last post
  34. 1st order or 2nd order distribution

    Hi, I'm fitting a distribution to the starting times of the first car journey in the day. I have a sample of 3,000 journey starting times. I am...

    Started by bradyj2‎, 11-03-2012 08:55 AM
    • Replies: 0
    • Views: 2,087
    11-03-2012, 08:55 AM Go to last post
  35. Probability of journey times

    Hello, If you assume that the average speed of car will be 30km/hr when making a journey. A journey distance is 10 km. You therefore...

    Started by bradyj2‎, 11-16-2012 08:29 AM
    • Replies: 3
    • Views: 1,668
    11-16-2012, 11:17 AM Go to last post
  36. Q-Q plot equivalent for discrete variable?

    Hello, You can use a Q-Q plot to visually test if 2 continuous variables are from the same distribution and you get a straight line. Is there...

    Started by bradyj2‎, 12-04-2012 08:05 AM
    • Replies: 0
    • Views: 2,360
    12-04-2012, 08:05 AM Go to last post
  37. quantify difference between discrete distributions

    Hello, I am trying to quantify the difference between two discrete distributions. I have been reading online and there seems to be a few...

    Started by bradyj2‎, 02-14-2013 09:49 AM
    • Replies: 0
    • Views: 1,589
    02-14-2013, 09:49 AM Go to last post
  38. Probability of electric car recharging

    Hi, I'm reading a paper which calculates the probability of an electric car re-charging. Data has been recorded from a car. There are 2 types of...

    Started by bradyj2‎, 03-01-2013 06:16 AM
    • Replies: 4
    • Views: 1,159
    03-01-2013, 10:19 AM Go to last post
  39. two-sample Kolmogorov-Smirnov test

    Hello, Hello, I have recorded some discrete data with an unspecified distribution. I have generated some discrete data from a model. I'm...

    Started by bradyj2‎, 02-08-2013 08:54 AM
    • Replies: 0
    • Views: 795
    02-08-2013, 08:54 AM Go to last post
  40. simple probability question

    Hello, I have a simple probability question that I was hoping somebody could answer. If I know that the probability that a charging point is...

    Started by bradyj2‎, 04-02-2013 01:49 PM
    • Replies: 2
    • Views: 1,867
    04-04-2013, 01:33 PM Go to last post
  41. Simulating a probability, use a random number?

    Hello, I looking for some advice for a simulation. I know that when an electric car arrives at a destination there is a 70% chance that a...

    Started by bradyj2‎, 03-04-2013 04:29 PM
    • Replies: 3
    • Views: 1,139
    03-09-2013, 01:13 PM Go to last post
  42. variance of product

    hi, i try to prove this property. Verify that: Var=Var.Var +Var.E^2+ Var.E^2 X,Y are independent variables. i tried the definition of variance...

    Started by brad_sue‎, 01-27-2012 09:53 AM
    • Replies: 1
    • Views: 2,206
    01-27-2012, 10:17 AM Go to last post
  43. Probability and Efficiency

    I have a probability question I am looking for some help with. In the scenario I perform a task on an object. I will either succeed or fail....

    Started by braeden‎, 04-13-2016 10:31 AM
    • Replies: 0
    • Views: 1,191
    04-13-2016, 10:31 AM Go to last post
  44. Expected value

    I can't figure out how to set this up. The compilation of data is boggling my mind. Do i use the 0,1,2,3,4,5,6,7,8,9 to figure my probabilities? ...

    Started by brainfried78‎, 01-25-2017 12:10 AM
    • Replies: 4
    • Views: 4,351
    01-25-2017, 09:31 PM Go to last post
  45. Normal distribution? Probability? What?! Help, please! D:

    I'm doing a sample test for a Stats quiz I have on Tuesday and I've run into a question that I just cannot get. :confused: I'm sure the method to use...

    Started by BrandiMR‎, 02-25-2010 01:38 PM
    • Replies: 2
    • Views: 3,821
    02-25-2010, 04:36 PM Go to last post
  46. probability question

    This is probably going to seem so easy to most of you but I cannot remember how to do this problem. In one town 64% of adults have health...

    Started by brandy79‎, 06-17-2008 04:34 PM
    • Replies: 2
    • Views: 2,038
    06-18-2008, 12:07 AM Go to last post
  47. expectation problem

    10 balls are inserted (uniformly) into five jars ..each insertion is independent from the others. compute E(X1*X2) where X1 and X2 describes the...

    Started by bravehera1‎, 01-16-2012 04:32 PM
    expectation
    • Replies: 3
    • Views: 3,583
    01-21-2012, 08:58 AM Go to last post
  48. Smile Request: Exams(CS109)

    hi, im studying for an exam in Introduction for Probability to CS.. does anyone have past exams of CS109 from Stanford/ similiar courses at...

    Started by bravehera1‎, 02-14-2012 03:27 PM
    • Replies: 2
    • Views: 2,825
    02-14-2012, 07:09 PM Go to last post
  49. Distributions

    shuffle a deck of 52 cards turn over one top card until you reach the first ACE. find the E(X).

    Started by brazil09‎, 04-16-2009 02:57 PM
    • Replies: 1
    • Views: 2,295
    04-16-2009, 07:59 PM Go to last post
  50. Maximum probability in a grid

    Hi, this is my first post, so hello! My problem (and my question) is how can I either express the probabilities calculated below as the...

    Started by breakeven‎, 12-21-2015 06:04 AM
    • Replies: 0
    • Views: 2,044
    12-21-2015, 06:04 AM Go to last post
  51. Issues with Probability Mass Function

    Hello, could someone please provide guidance with this question? (a) Let X be the maximum value when two cards are randomly selected from a deck...

    Started by Breno Cavalheiro‎, 06-21-2011 01:03 AM
    • Replies: 3
    • Views: 4,521
    06-21-2011, 09:05 AM Go to last post
  52. Thumbs up Excel Simulation (Monte Carlo) help

    Hi all, I've been racking my non-statistical brain on my Excel simulation (monte carlo sim predicts profit). I have created the model and as I...

    Started by BrentCOS‎, 03-01-2016 07:39 PM
    excel, monte carlo, simulation
    • Replies: 3
    • Views: 2,217
    03-01-2016, 10:20 PM Go to last post
  53. bayesian

    I had a question about the bayesian estimator. My question comes directly from a wikipedia page on the subject. ...

    Started by bres6486‎, 01-08-2009 03:20 PM
    • Replies: 5
    • Views: 3,262
    01-16-2009, 12:52 AM Go to last post
  54. Card Pairs Problem with a Twist (TV Gameshow)

    Hi I'm working out a solution for a TV gameshow which leads me to a problem... I'd like to know the probability of finding a pair of cards in the...

    Started by Brian Factor‎, 05-03-2012 04:50 AM
    • Replies: 0
    • Views: 1,531
    05-03-2012, 04:50 AM Go to last post
  55. simple probability question

    So i just wrote a test and i answered this question as 50% tell me if i am right supposed 50% of all students in the world read newspaper. 5...

    Started by briankimmy‎, 02-06-2013 04:33 PM
    • Replies: 2
    • Views: 980
    02-06-2013, 07:59 PM Go to last post
  56. need help with a handful of question

    Hello.. I just found this site and I was wondering if you guys could help me. I've never been very good at stats and I've been working on questions...

    Started by BrianS‎, 01-25-2007 03:38 PM
    • Replies: 3
    • Views: 2,579
    01-28-2007, 11:48 AM Go to last post
  57. probaliblity question

    a producer of a fruit drink advertises it contains 10% real fruit juices. A sample of 75 bottles are analyzed and it's found that only 6.6% is real...

    Started by BrianS‎, 01-28-2007 12:22 PM
    • Replies: 1
    • Views: 2,263
    01-28-2007, 04:27 PM Go to last post
  58. Number serviceable at given time

    If I have 50 systems each operating 400 hours per year with an MTBF of 900 hours how do I calculate how many would be serviceable at one time?...

    Started by brif‎, 07-24-2014 07:46 AM
    • Replies: 12
    • Views: 2,574
    07-28-2014, 08:40 AM Go to last post
  59. Need help with this problem asap

    1. The average number of calls received by a switchboard in a 30-minute period is 15. What is the probability that between 10:00 and 10:30 the...

    Started by brigog‎, 03-30-2008 08:44 PM
    • Replies: 0
    • Views: 4,534
    03-30-2008, 08:44 PM Go to last post
  60. Really Easy Question

    This is a basic question about probabilities, specifically what kind of test to use. I think I am close to an answer, but I am not sure. The idea...

    Started by Brillow‎, 10-24-2007 12:24 AM
    • Replies: 0
    • Views: 2,828
    10-24-2007, 12:24 AM Go to last post

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