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Forum: Statistics

Statistics course and homework discussion. Elementary statistics.

  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: 66,617
    09-30-2005, 09:44 AM Go to last post
  2. Sticky Thread Sticky: Forum Guidelines: Smart posting behavior pays off

    Welcome to talkstats.com, the place for statistics help. This is a guideline for people who want to ask a question on this forum and value a...

    Started by TheEcologist‎, 11-27-2010 12:13 PM
    • Replies: 1
    • Views: 196,558
    07-16-2014, 11:01 AM Go to last post
  1. Confidence level vs Confidence Interval

    I am getting really confused on the confidence level/confidence interval distinction. Most examples I see on the net pair off a 95% confidence...

    Started by aferim‎, 09-11-2013 04:53 PM
    • Replies: 9
    • Views: 4,459
    09-12-2013, 12:59 PM Go to last post
  2. Confidence interval from st. error when the mean must be positive

    Hello all, (Statistical newbie here - learning some basic concepts) Some background (you can probably skip to the 'important bit', but just in...

    Started by aferraro‎, 10-23-2012 10:21 AM
    • Replies: 6
    • Views: 1,718
    10-29-2012, 04:59 PM Go to last post
  3. Next step after my MANOVA

    Hi everyone, sorry if this is a stupid question! I am doing a study into the effects of sleep deprivation on risk taking. I have one independent...

    Started by Affinity‎, 07-18-2008 01:33 PM
    • Replies: 0
    • Views: 3,356
    07-18-2008, 01:33 PM Go to last post
  4. Question need help: ordinal data used as predictor for linear multiple regression analysis??

    Part of my thesis tries to investigate the extent to which students "test Score" on the topic of electrical circuits in physic can be predicted from...

    Started by afful‎, 05-12-2013 06:08 PM
    tony
    • Replies: 2
    • Views: 1,162
    05-12-2013, 11:35 PM Go to last post
  5. Independence of three normal distributions

    Hi everyone, I'm analyzing some data from a fishing gear experiment. The gear diverts some fish away from the net, so the response variable here...

    Started by AFH‎, 10-18-2012 12:26 PM
    • Replies: 6
    • Views: 1,569
    10-22-2012, 05:25 PM Go to last post
  6. estimate a and b parameters.

    I watched all of brandons foltz vids on his statistics playlist but for the life of me im stunned and i think due to the technical language barrier...

    Started by Aflred‎, 09-08-2013 05:30 AM
    • Replies: 5
    • Views: 1,869
    09-09-2013, 11:57 AM Go to last post
  7. Problem- fluctuating negative control

    Hi, I have what sounds to me like a simple question that I just want to hear some opinions on. I'm trying to quantify changes in gene expression...

    Started by afolkl‎, 05-24-2007 09:13 AM
    • Replies: 0
    • Views: 1,687
    05-24-2007, 09:13 AM Go to last post
  8. Question on state space model

    Hello, I am currently analyzing a paper on the evolution on the Union's and the Confederation's currency price in gold during the Civil War. The...

    Started by afranck‎, 05-12-2014 11:15 AM
    • Replies: 0
    • Views: 847
    05-12-2014, 11:15 AM Go to last post
  9. t (median) test for difference in means (medians)

    I would like to ask if anyone can help in showing me how to perform the statistical test for the following scenario: There are four groups of data...

    Started by afsf‎, 01-25-2010 03:01 AM
    • Replies: 0
    • Views: 3,770
    01-25-2010, 03:01 AM Go to last post
  10. Lightbulb (bio)equivalence tests: acceptable difference

    As you may know, (bio)equivalence tests are tests that are able to show equivalence between two compared groups, other than the more common tests...

    Started by Afterburn‎, 04-26-2007 07:40 AM
    • Replies: 0
    • Views: 3,472
    04-26-2007, 07:40 AM Go to last post
  11. Question Required sample size for Tolerance Intervals

    What would be the minimum required sample size in order to construct a relevant Tolerance Interval? Are there any guidances out there that specify...

    Started by Afterburn‎, 03-16-2011 10:57 AM
    • Replies: 0
    • Views: 4,197
    03-16-2011, 10:57 AM Go to last post
  12. Statistics/Probability Question

    I'm going over a study guide that I have for a test on Thursday and I'm having issues finding the answer to a "neither" question and I wanted to see...

    Started by aftyc1239‎, 02-13-2009 03:47 PM
    • Replies: 1
    • Views: 13,306
    02-14-2009, 11:42 PM Go to last post
  13. normal distribution

    Hello!! Thanks!

    Started by af_231‎, 04-04-2011 08:48 PM
    • Replies: 3
    • Views: 2,409
    04-06-2011, 11:04 AM Go to last post
  14. Generation Time Series by Stochastic Model

    Hello Everybody!!! I have to generate 2000 time series by the following stochastic model: X(t)=50+0.8x(t-1)+e(t) X(0)=0 Initial Value e(t)=Normal...

    Started by af_231‎, 10-19-2011 12:42 AM
    • Replies: 7
    • Views: 2,421
    10-19-2011, 07:52 AM Go to last post
  15. Unstable Fixed Points and Stable Fixed Points

    Hello everybody! I am studying Chaotic Dynamics Theory, and I'm a little confused with stability analysis. In order to determine the stability...

    Started by af_231‎, 10-20-2011 08:31 PM
    • Replies: 0
    • Views: 2,390
    10-20-2011, 08:31 PM Go to last post
  16. Correlation Dimension

    Hello everybody!! Again I'm here asking your help .... I'm looking for the procedure for the estimation of correlation dimension (chaos theory). ...

    Started by af_231‎, 10-31-2011 05:05 AM
    • Replies: 0
    • Views: 1,435
    10-31-2011, 05:05 AM Go to last post
  17. Correlation Integral

    Hello everybody!! I'm here asking your help!!.... Can somebody explain me the correlation integral. I have tried to compute correlation dimension...

    Started by af_231‎, 11-09-2011 12:41 AM
    • Replies: 0
    • Views: 1,860
    11-09-2011, 12:41 AM Go to last post
  18. Parameters of Probability Density Functions

    Hello! As part of a Probabilistic Distribution Study, I selected a number of distribution to fit the data and I already estimated their...

    Started by af_231‎, 11-10-2011 07:58 AM
    • Replies: 6
    • Views: 2,833
    11-10-2011, 10:06 AM Go to last post
  19. Data independent and identically distributed... How to prove it?

    Hello everybody! I am running a frequency analysis of flood and wind speed, for which the data are assumed to be independent and identically...

    Started by af_231‎, 11-18-2011 02:11 AM
    • Replies: 3
    • Views: 8,853
    11-18-2011, 11:26 AM Go to last post
  20. Recommendation on Statistical Software

    Hello everybody! Today I am asking your recommendation on statistical software. As part of a project I have to fit many distributions in order to...

    Started by af_231‎, 12-07-2011 04:55 AM
    • Replies: 0
    • Views: 1,515
    12-07-2011, 04:55 AM Go to last post
  21. Someone who can help me with EasyFit (Statistical Software)

    Hello! As part of a project I am fitting many probability density distributions .... I am doing all it on excel (making each equation), but I am...

    Started by af_231‎, 12-08-2011 03:01 AM
    • Replies: 1
    • Views: 2,197
    12-08-2011, 04:02 AM Go to last post
  22. How to choose the best distribution among various distributions if.....?

    How to choose the best distribution among various distributions if all meet the goodness of fit test (Kolmogorov Smirnov, Anderson Darling and...

    Started by af_231‎, 12-15-2011 12:23 AM
    • Replies: 4
    • Views: 2,529
    12-16-2011, 05:36 AM Go to last post
  23. P-Value

    Hello everybody!! I feel sorry because my question is quite elemental.... but I've read about it and I don't understand well. I fitted my data to...

    Started by af_231‎, 01-03-2012 02:14 AM
    • Replies: 3
    • Views: 3,015
    01-09-2012, 05:21 PM Go to last post
  24. LogPearson 3 Parameters calculation

    Hello! I am trying to calculate LogPearson 3 Distribution, to do that I am following the book Flood and Frequency Analysis by A. Ramachandra Rao.......

    Started by af_231‎, 01-03-2012 02:59 AM
    • Replies: 2
    • Views: 1,726
    01-03-2012, 04:32 AM Go to last post
  25. Latin Hypercube Sampling and Importance Sampling

    Hello... I need help on Latin Hypercube Sampling and Importance Sampling. I don't know if this one is the correct forum to ask about it, but maybe...

    Started by af_231‎, 01-12-2012 01:10 AM
    • Replies: 3
    • Views: 3,138
    01-12-2012, 06:54 AM Go to last post
  26. Risk Analysis or Uncertainty Analysis Methods

    Hello there! I have been studying risk analysis methods and uncertainty analysis methods, but I am not sure if MEAN VALUE FIRST-ORDER SECOND MOMENT...

    Started by af_231‎, 01-24-2012 08:37 AM
    • Replies: 0
    • Views: 1,645
    01-24-2012, 08:37 AM Go to last post
  27. Sampling Method and Uncertainty Analysis

    Hello everyone! As part of a project, I have to run a uncertainty analysis: uncertainty factors (random variables) are reproduced by a proposed...

    Started by af_231‎, 01-18-2012 05:27 AM
    • Replies: 0
    • Views: 1,376
    01-18-2012, 05:27 AM Go to last post
  28. Sampling Methods

    Hello everybody! Can you recommend me any program or excel add-in to reproduce uncertainty factors by sampling methods: latin hypercupe sampling,...

    Started by af_231‎, 01-17-2012 08:02 PM
    • Replies: 3
    • Views: 2,032
    01-18-2012, 11:25 AM Go to last post
  29. Monte Carlo Sampling...I would appreciate your help!

    Hello! Sorry, I am new in the statistic area, so I have many doubts... I am trying to understand Monte Carlo Sampling Method. Although this...

    Started by af_231‎, 01-31-2012 12:10 AM
    • Replies: 0
    • Views: 1,340
    01-31-2012, 12:10 AM Go to last post
  30. Need help from someone who knows about importance sampling.

    Hello! My question is about Importance Sampling. I am trying to apply a complex sampling method, which combine two sampling techniques. To do this,...

    Started by af_231‎, 01-31-2012 08:21 AM
    • Replies: 1
    • Views: 2,339
    01-31-2012, 08:14 PM Go to last post
  31. Desperately need help ..... Importance Sampling

    Sorry for posting the question again, but I have made several questions about sampling methods but haven't received suggestions or ideas, and I...

    Started by af_231‎, 02-01-2012 12:34 AM
    • Replies: 0
    • Views: 1,204
    02-01-2012, 12:34 AM Go to last post
  32. Sampling Methods and Risk Analysis!

    Hello, maybe someone can help me answering some questions about sampling methods and analysis of risk. Question 1) Is this correct?: The basic...

    Started by af_231‎, 02-05-2012 08:43 PM
    • Replies: 0
    • Views: 1,378
    02-05-2012, 08:43 PM Go to last post
  33. Rayleigh and Extreme Value Distribution Type II (Fretech Distribution)

    Hello! I am looking for the equations to quantile estimation by Rayleigh, Extreme Value Type II Distributions (Frechet Distribution) and Weilbull...

    Started by af_231‎, 02-17-2012 04:30 AM
    • Replies: 3
    • Views: 2,327
    02-17-2012, 11:58 PM Go to last post
  34. Which statistical technique should i use?

    Hello everyone! I would like to hear your advice about this: I am trying to get an operation rule of dam spillway outflow during flood period. As...

    Started by af_231‎, 03-06-2012 06:12 AM
    • Replies: 0
    • Views: 1,282
    03-06-2012, 06:12 AM Go to last post
  35. Latin Hypercube - Monte Carlo Sampling ~ VBA CODE

    Hello! Having no experience with writing VBA code, I seek your assistance. I am looking an example of VBA (or any other programming software) CODE...

    Started by af_231‎, 03-07-2012 08:27 AM
    • Replies: 0
    • Views: 3,393
    03-07-2012, 08:27 AM Go to last post
  36. Advice to improve Monte Carlo Simulation (Uncertainty Analysis)

    Hello! Can anyone suggest me any method or technique to improve Monte Carlo Simulation (Sampling Method) on Uncertainty Analysis? Thanks! ~~

    Started by af_231‎, 03-13-2012 11:38 PM
    • Replies: 2
    • Views: 1,609
    03-14-2012, 04:20 AM Go to last post
  37. Multivariate regression equation

    Hello everybody! Maybe someone can help me with this: I read in a notebook a statistical process, in which one of this steps says: Decide a...

    Started by af_231‎, 03-20-2012 04:30 AM
    • Replies: 1
    • Views: 1,861
    03-20-2012, 09:19 AM Go to last post
  38. How many times must be divided the CDF vertical axis in Latin Hypercube Sampling?

    Hello! Please can someone help me with this? I am quite confused on how many times must be divided the CDF vertical axis in Latin Hypercube...

    Started by af_231‎, 03-22-2012 01:52 AM
    • Replies: 0
    • Views: 1,249
    03-22-2012, 01:52 AM Go to last post
  39. Frequency Factor K for the Log Pearson 3 distribution

    Hello! I know some expressions for calculating K directly from Cs, such as: - Using table (maybe the best way, but require a manual process) -...

    Started by af_231‎, 03-23-2012 02:35 AM
    • Replies: 0
    • Views: 4,047
    03-23-2012, 02:35 AM Go to last post
  40. Monte Carlo Simulation - Distributions - Inverse CDF Method

    I am doing a Monte Carlo Simulation for to types of time series data, each of them fit a different distribution (Gumbel Max and LogPearson Type III)....

    Started by af_231‎, 03-26-2012 10:31 PM
    • Replies: 0
    • Views: 3,340
    03-26-2012, 10:31 PM Go to last post
  41. How can I calculate the probability in Section A of the attached image??

    Hello all! Please help me with this: I want to calculate the Probability in Section A .... Please see attached image. Assuming that Z (data...

    Started by af_231‎, 03-29-2012 06:26 AM
    • Replies: 1
    • Views: 2,657
    03-29-2012, 09:45 AM Go to last post
  42. Comparing Monte Carlo Sampling and Latin Hypercube Sampling

    Hello everybody! Can someone help me with this?...:confused: I ran a risk model one time using Monte Carlo Sampling, and other time using Latin...

    Started by af_231‎, 04-12-2012 06:09 AM
    • Replies: 2
    • Views: 2,083
    04-12-2012, 10:09 AM Go to last post
  43. Post Statistical test for comparing percentage not mean

    Hi, I am wondering what test should I use to compare two percentage value from two different observations. Let's say I have a damage of crop 15%...

    Started by Ag-Bob‎, 07-13-2017 05:52 PM
    percentage, significance test, statistical tests
    • Replies: 2
    • Views: 860
    07-14-2017, 09:19 AM Go to last post
  44. comparing percentages

    I appologize for posting this topic again, I wasn't able to apply previous answers to previous posts to my problem. My problem is this: I'm...

    Started by agabo‎, 11-23-2009 12:37 PM
    • Replies: 5
    • Views: 6,813
    05-28-2011, 08:03 PM Go to last post
  45. How do you find equally likely possibilities?

    I have attached a homework problem to this post. It asks what the probability is that all 4 watches of a selection are inaccurate when the...

    Started by againanew‎, 05-14-2014 11:09 AM
    • Replies: 0
    • Views: 986
    05-14-2014, 11:09 AM Go to last post
  46. Determining which statistical test to use and how to figure out sample size

    Hello, I'm looking to collect data for the organization that I work for (a senior retirement community management company) and draw correlations...

    Started by agalvan‎, 11-05-2012 05:32 PM
    • Replies: 0
    • Views: 3,122
    11-05-2012, 05:32 PM Go to last post
  47. Help with Stats Assignment

    I posted this in the Psych Stats area, but thought it might be better here ... any help or advice is greatly appreciated I came across this forum...

    Started by Agape000‎, 04-06-2013 10:17 PM
    • Replies: 0
    • Views: 876
    04-06-2013, 10:17 PM Go to last post
  48. (SEM) Structural Modeling: identifying problems

    Hello, I've received a homework at my UNI to resolve untill my exam (which is friday). It's about SEM. It is in form of a forum post and we need to...

    Started by agata90‎, 02-02-2015 02:12 PM
    • Replies: 2
    • Views: 1,726
    02-02-2015, 04:43 PM Go to last post
  49. Which test should I use for two unequal groups ?

    Hi all! I have data that include 20 samples divided into 2 groups (category A and category B). The groups are independent, none of the value in...

    Started by AgataM‎, 12-11-2016 11:03 AM
    mann-whitney test, normal distribution, student t-test, welch's t-test
    • Replies: 11
    • Views: 3,295
    12-11-2016, 04:37 PM Go to last post
  50. Logistic regression - intepretation of results

    Hi all, I have binary data for which 70% involve 1 (yes) and 30% involve 0 (no). I've done logistic regression in MedCalc. Results below: ...

    Started by AgataM‎, 03-02-2017 02:51 PM
    logistic regression
    • Replies: 5
    • Views: 1,678
    03-02-2017, 05:08 PM Go to last post
  51. Solution for Non-normally distributed data

    hello there, I am doing some statistical analysis on medical sample data. I need to need to find variables which influences the length of stay in...

    Started by Agate‎, 11-29-2013 06:32 PM
    non-normal distribution, normal distribution, regression assumption, sas, sas enterprose guide
    • Replies: 2
    • Views: 1,208
    11-30-2013, 06:33 AM Go to last post
  52. Post Problem: How many people should be interviewed by manager?

    Guys sadly I almost have no experience in statistics, but I need to solve this problem today for my job application and I'm kinda lost. I would...

    Started by agenkin‎, 06-12-2014 09:39 AM
    • Replies: 5
    • Views: 2,824
    06-13-2014, 07:58 AM Go to last post
  53. Exclamation Help need on hypothesis testing

    Hi All, This is my first post in this forum. So please excuse me if it is posted in wrong place or does not adhere to forum standard. I would soon...

    Started by AgentA‎, 07-12-2013 05:35 AM
    • Replies: 3
    • Views: 1,613
    07-12-2013, 08:18 AM Go to last post
  54. Examining The Relationship Between Two Series

    Hi Everyone First time post so please bear with me. I have two time series stretching several years of daily prices of two commodities, say gold...

    Started by agentred‎, 02-20-2009 03:48 PM
    • Replies: 0
    • Views: 2,137
    02-20-2009, 03:48 PM Go to last post
  55. Accounting for covariate in a mixed-model anova?

    Dear all, I'm doing a study on changes in hydrogen in patients undergoing surgery. I have 2 groups of patients, and have taken 3 blood samples for...

    Started by agentshimmi‎, 05-01-2012 04:05 PM
    • Replies: 0
    • Views: 1,366
    05-01-2012, 04:05 PM Go to last post
  56. standard normal distribution/ PLEASE HELP

    I have this question: Men are eligible for this club if they are 74in tall. what percentage of men are eligible to join the club. also the mean of...

    Started by agirl‎, 12-19-2006 09:21 PM
    • Replies: 2
    • Views: 4,892
    12-20-2006, 04:28 PM Go to last post
  57. Exclamation Cronbachs Alpha- Quick question, urgent help needed

    Hi guys, hope you are all doing fine. I have an exam on monday and need to know how to calculate Cronbach's alpha. I know that you have to use...

    Started by AGK‎, 07-15-2017 11:55 AM
    alpha, cronbach, formula
    • Replies: 1
    • Views: 1,014
    07-15-2017, 02:22 PM Go to last post
  58. Average Hours

    We have the following data and we need to find average hours it takes to complete one item in CNC Item Quantity HOurs Applied Dept A 1 ...

    Started by agovindasamy‎, 06-08-2007 11:33 AM
    • Replies: 3
    • Views: 3,170
    06-14-2007, 10:51 AM Go to last post
  59. Question on sample var/se and DoF

    When you are calculating a sample's variance or standard error, you use (Sum(X - Xbar)^2)/(n-1), and the square root for SE. n-1 is the degree of...

    Started by agp‎, 12-26-2012 10:41 PM
    • Replies: 4
    • Views: 2,013
    12-27-2012, 09:23 AM Go to last post
  60. What test to use?

    Let's say you are testing the affect of two things, A and B, on study subjects. One group of subjects is assigned to A, and the other is assigned to...

    Started by agp‎, 01-03-2013 01:35 PM
    • Replies: 12
    • Views: 2,360
    01-04-2013, 04:00 PM Go to last post

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