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Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

  1. Sticky Thread Sticky: Proof of the day

    In this thread we post one (or more if you can't wait) proof a day. I'll start by proving the that V=\sigma^2(X'X)^{-1} in the linear...

    Started by Englund‎, 01-18-2014 04:56 AM
    • Replies: 14
    • Views: 18,751
    10-11-2014, 12:02 PM Go to last post
  1. Panel Data - Pooled OLS vs Fixed Effects vs Random Effects

    Hi forummers, I am a finance PhD student and am currently undertaking some statistical analysis of bankruptcy risk. I have data on roughly 500...

    Started by g1362901‎, 03-26-2009 11:35 AM
    • Replies: 2
    • Views: 78,890
    03-09-2012, 01:54 PM Go to last post
  2. Lightbulb Sample size calculations for randomized controlled clinical trial

    Looking for a proper sample size formula for a randomized, double-blind, placebo-controlled clinical trial. There will be three arms for the trial (2...

    Started by jbw‎, 09-22-2010 08:04 PM
    • Replies: 2
    • Views: 10,281
    01-31-2012, 07:02 AM Go to last post
  3. Export and Import Model

    Hi I am doing a project examining bilateral trade between Canada and U.S. This model was the most recent in the literature and was advised by my...

    Started by solomon‎, 07-07-2011 01:16 PM
    • Replies: 2
    • Views: 2,054
    04-01-2012, 09:27 AM Go to last post
  4. Confidence interval for (Xbar-2*Ybar)

    Hi, Can any body help me to calculate confidence intervals for (Xbar-2*Ybar), where X and Y are two random variables. Is this as simple as (Xbar -...

    Started by ramakrishna‎, 06-13-2012 10:54 AM
    • Replies: 2
    • Views: 2,366
    06-13-2012, 11:06 AM Go to last post
  5. Sensitivity Analysis for Multivariable Problem

    Hello all, first off I hope this is in the right forum and thanks for reading. I am a practicing engineer and have run into a problem where I have...

    Started by Acorogia‎, 12-23-2011 06:39 PM
    • Replies: 2
    • Views: 1,802
    01-03-2012, 02:47 PM Go to last post
  6. Modeling residual variance in regression

    Hi all Consider an ordinary linear regression model. The residuals are assumed to be normally distributed on N(0,sigma). I believe it is possible...

    Started by longrob‎, 12-26-2011 08:33 AM
    • Replies: 2
    • Views: 3,098
    01-05-2012, 10:07 AM Go to last post
  7. Survey Analysis

    I have survey results that needs to be analyzed . Basically, survey contains 5 categories and each categorie has some questions. The subjects rated...

    Started by masarimk‎, 12-28-2011 11:28 AM
    • Replies: 2
    • Views: 1,561
    01-02-2012, 12:16 PM Go to last post
  8. Help with data!!!

    Hi, I am new to the forum and would massively appreciate some help with some research I am doing. I am looking at a series of students marks over...

    Started by Milly‎, 01-21-2012 02:49 PM
    • Replies: 2
    • Views: 1,413
    01-21-2012, 06:52 PM Go to last post
  9. Variables for INDEX - can I include variables with differents units of measurement?

    Hi All, please help with this question. I want to create an index to measure natural resources. Could you kindly advise whether I can include...

    Started by SylviaS‎, 01-23-2012 01:37 PM
    • Replies: 2
    • Views: 1,781
    01-24-2012, 12:31 PM Go to last post
  10. Wilcoxon rank sum test on Cross Validation Results

    Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

    Started by gajan‎, 01-30-2012 04:30 AM
    cross validation, wilcoxon rank sum test
    • Replies: 2
    • Views: 2,579
    01-31-2012, 03:33 AM Go to last post
  11. Bonferroni-Holm adjustment

    I have sort of a weird question. I am reading a journal article and basically the authors used a Kruskal-Wallis test to compare the median values of...

    Started by lancearmstrong1313‎, 01-30-2012 02:31 PM
    • Replies: 2
    • Views: 2,978
    01-31-2012, 01:18 PM Go to last post
  12. Help with interpreting chi-squared

    Hello everyone, I am new here, so I hope I'm posting my question in the right section! I'm having trouble interpreting the results of an old...

    Started by Millie‎, 02-01-2012 02:51 AM
    • Replies: 2
    • Views: 2,914
    02-04-2012, 12:46 AM Go to last post
  13. Comparing the mean of top and bottom quartiles

    Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

    Started by lolozgor‎, 02-08-2012 12:26 AM
    quartile, t-test
    • Replies: 2
    • Views: 3,923
    02-08-2012, 12:45 AM Go to last post
  14. Choice of analysis method and variable skew

    Hello, I'm a new poster here, so I apologise if this is not the right place. My problem is as follows: I am conducting research into fatigue and...

    Started by DrDogg‎, 02-13-2012 05:18 PM
    • Replies: 2
    • Views: 1,993
    02-14-2012, 02:30 PM Go to last post
  15. Mahalanobis Distance

    Hello, I have a question about working with Mahalanobis distance (MD). The materials I have on the matter say to enter the IVs for the analyses you...

    Started by parrot‎, 02-17-2012 12:27 PM
    • Replies: 2
    • Views: 2,002
    02-18-2012, 11:52 AM Go to last post
  16. Chi square contingency table error!

    From what I understand of chi square the rows and columns must be data that are categorical. My first question is whether Increase and decrease...

    Started by kenshi64‎, 02-26-2012 07:50 AM
    • Replies: 2
    • Views: 1,668
    02-26-2012, 08:52 AM Go to last post
  17. Analysing an unbalanced factorial design

    Hello, I have data from an unbalanced factorial design, and would like some suggestions to analyse them. It is supposed to be 3 x 2 factorial...

    Started by madegwu‎, 02-28-2012 02:17 AM
    • Replies: 2
    • Views: 4,296
    02-28-2012, 11:43 PM Go to last post
  18. Lightbulb Data transformation and kruskal-wallis

    Hi! It's the first time I'm posting in your forum! I'm using statistics in a university project about operations research, and I'm having some...

    Started by Rak3l‎, 02-28-2012 11:46 AM
    kruskal-wallis
    • Replies: 2
    • Views: 2,231
    02-28-2012, 12:00 PM Go to last post
  19. Correlation

    Hi! I'm currently working on a research..but I'm having problems with correlation. I want to correlate a test with 5 general scales to a test with...

    Started by mae‎, 03-02-2012 05:08 AM
    • Replies: 2
    • Views: 2,140
    03-02-2012, 11:52 AM Go to last post
  20. Correlation coefficient in two groups separately and the collapsed across groups

    Hi, I'm having trouble interpreting the results of a test of bivariate correlation. I am computing Pearson's r in a group of 400 as a whole,...

    Started by slipperyn‎, 03-03-2012 11:38 AM
    correlation
    • Replies: 2
    • Views: 2,130
    03-03-2012, 12:26 PM Go to last post
  21. Sampling problems

    Hi, I need to sample randomly my dataset for 1000 times. The sample need to be the 80%. I know how to do that, my problem is that not only I need...

    Started by Oritteropus‎, 03-07-2012 11:43 AM
    • Replies: 2
    • Views: 1,991
    03-07-2012, 07:05 PM Go to last post
  22. Issue with data analysis

    This has given me sleepless nights. Let's say I have a study where I want to look at the relationship between Grade Point Average and basket...

    Started by dummyvariables‎, 03-08-2012 04:18 PM
    • Replies: 2
    • Views: 2,279
    03-08-2012, 07:05 PM Go to last post
  23. Algebra of random variables?

    Hi Guys, I'm in the field now, so I'm not online much. However I do have a burning question. Does anyone have any book suggestions for me that...

    Started by TheEcologist‎, 03-12-2012 09:51 AM
    • Replies: 2
    • Views: 2,476
    03-12-2012, 11:33 AM Go to last post
  24. Correlation between two dependent variables on repeated measures

    Hello there! I am trying to see if there is covariation of two variables (anxiety and sleeping heart rate) over multiple days of testing the same...

    Started by Major‎, 03-10-2012 08:54 PM
    repeated measures
    • Replies: 2
    • Views: 10,162
    05-02-2012, 06:13 AM Go to last post
  25. Is MANOVA the most appropriate test?

    I'm interested in how microphone types affect the result of acoustic analysis measures. I'm looking for the most appropriate statistical test to...

    Started by Linguist_‎, 03-20-2012 11:40 PM
    • Replies: 2
    • Views: 1,999
    03-22-2012, 12:49 PM Go to last post
  26. Wilk s theorem and LR test

    Hello, I have first posted the following in the "Statistics help" section, but it might be that it is better to post it here. I have some...

    Started by Arkonis‎, 03-22-2012 11:19 AM
    • Replies: 2
    • Views: 3,658
    03-30-2012, 09:56 AM Go to last post
  27. Data collection???

    First off apologies if I should have just posted this in my other thread. I am working with some cycle hire data from the Barclays Bicycle Hire...

    Started by Wevans2303‎, 03-22-2012 07:04 PM
    • Replies: 2
    • Views: 1,484
    03-22-2012, 07:52 PM Go to last post
  28. Is Count/Expected Count in Chi Square a good descriptive measure?

    I want to simplify these outcomes. Can I simply divide the observed count / expected count to get a sort of 'odds ratio'? I am doing this with +3...

    Started by skoren‎, 03-28-2012 09:28 PM
    • Replies: 2
    • Views: 1,471
    03-29-2012, 01:27 PM Go to last post
  29. help with reproducibility and accuracy - influence on sample sze

    Statistics query resolved at TalkStats Statistics query resolved at TalkStats Statistics query resolved at TalkStats

    Started by capturgaby‎, 09-24-2012 07:18 AM
    • Replies: 2
    • Views: 1,228
    09-24-2012, 10:38 AM Go to last post
  30. Variance Of Expression

    Hi, maybe somebody can help me with finding variance of expression that shown in attached pdf file. Thanks, Michael

    Started by Michael123‎, 04-17-2012 09:07 AM
    • Replies: 2
    • Views: 1,906
    04-18-2012, 01:04 AM Go to last post
  31. T-test puzzlement

    I've been pondering on this for some time and I guess i'm confused because there are so many stats tests out there. Basically my aim is to figure...

    Started by nom‎, 04-19-2012 09:42 PM
    statistically significant, t-test
    • Replies: 2
    • Views: 1,657
    04-20-2012, 11:43 AM Go to last post
  32. Chi-square iinterpretation research project

    Hi Folks, For my uni research I'm doing a chi-square analysis. Basically what I'm comparing are 2 different medication groups. I'm comparing these...

    Started by marcel1‎, 04-26-2012 10:06 AM
    • Replies: 2
    • Views: 1,174
    05-07-2012, 04:15 PM Go to last post
  33. Optimal tests of hypothesis

    I have a question about the use of optimal tests of hypothesis in practice. Are they often used in research or in industry? I understand that UMP...

    Started by BrownianMan‎, 04-26-2012 10:49 PM
    • Replies: 2
    • Views: 2,180
    04-28-2012, 12:06 AM Go to last post
  34. Bayesian confuson

    Hi, I am trying to reconcile what I think are conflicting philosophies in my head about an experiment. The experiment is a hierarchical model...

    Started by Panopticon‎, 04-29-2012 10:02 PM
    • Replies: 2
    • Views: 1,587
    04-29-2012, 10:30 PM Go to last post
  35. presenting results of simple correlations and multiple regressions in the same paper

    I recently got comments back from a reviewer on a manuscript, criticizing my use of simple correlation and multiple regression analyses to study the...

    Started by l3a9k‎, 05-03-2012 12:31 PM
    • Replies: 2
    • Views: 3,131
    05-04-2012, 07:55 AM Go to last post
  36. detect mean and variance shifts

    from the plotted figure, how i can distinguish what i have to monitor mean or variance to detect a shift from the process

    Started by sihem‎, 05-06-2012 03:52 PM
    • Replies: 2
    • Views: 1,593
    05-06-2012, 04:25 PM Go to last post
  37. help in Real survey data analysis‏

    would you please guide me to analyze it? i will tell u overall view of the questionnaire and goals and hope to help me how to analyze it the...

    Started by kormbo2002‎, 05-19-2012 02:36 PM
    • Replies: 2
    • Views: 40,897
    05-19-2012, 03:47 PM Go to last post
  38. PLS-DA: Are latent variables comparative?

    Hello, first post on the forum - hopefully this is the correct place to do this. I've been working on developing an system for visualising the...

    Started by martinfitzp‎, 05-25-2012 05:30 AM
    • Replies: 2
    • Views: 3,454
    05-27-2012, 07:40 PM Go to last post
  39. how to interpret 2log(x)?

    I have coefficient B for 2 log(x) and was wondering how to interpret it. In this case B=1.9. Thank you for your help.

    Started by SylviaS‎, 05-26-2012 10:34 AM
    • Replies: 2
    • Views: 1,905
    05-26-2012, 11:44 AM Go to last post
  40. Plsr

    I know PLSR can deal with multiple dependent variables, how about if let say the 2 dependent variables are totally no relation at all, shall we do...

    Started by cheungr‎, 06-12-2012 11:11 AM
    • Replies: 2
    • Views: 1,515
    06-12-2012, 11:57 AM Go to last post
  41. Question Paired t-test VS Anova

    I'm reading an article which is comparing the effects of three variables. But the authors used several paired t-tests to measure two variables at a...

    Started by free_radicals‎, 06-22-2012 12:52 PM
    • Replies: 2
    • Views: 3,306
    06-22-2012, 06:37 PM Go to last post
  42. Rule Associations Help

    I apologize in advance if this is the wrong section. I'm trying to discover rule associations for a survey with over 140 attributes. All of the...

    Started by MattTC13‎, 07-05-2012 10:22 AM
    • Replies: 2
    • Views: 1,485
    07-05-2012, 10:49 AM Go to last post
  43. Technical name - Is this a 'multi-level model'?

    Hello. I am hoping that someone can tell me the technical name for the following type of analysis. I have a sense that it may be a 'multi-level'...

    Started by jesse‎, 07-27-2012 10:11 PM
    • Replies: 2
    • Views: 2,532
    07-28-2012, 01:15 AM Go to last post
  44. What model for small sample?

    Hi! I have 59 observations of farmers' annual net income (which is representative) and I want to see the effect of 15 independent variables, such...

    Started by Yives‎, 08-04-2012 12:32 PM
    • Replies: 2
    • Views: 1,937
    08-05-2012, 08:40 AM Go to last post
  45. Post Hoc

    If you have two groups for the I.V. (i.e. Men and Women) and one D.V. is it possible to run just a Post Hoc test? Isn't that the same as a T-test? ...

    Started by Shadow21‎, 08-08-2012 10:38 AM
    • Replies: 2
    • Views: 1,358
    08-09-2012, 10:17 PM Go to last post
  46. Help with interpreting simple chi-square!

    Hi everyone, I ran a simple experiment on whether blame for failures in relationships was seen to be internal or external, and these were the...

    Started by cassandra‎, 08-11-2012 05:54 AM
    • Replies: 2
    • Views: 2,553
    08-11-2012, 12:48 PM Go to last post
  47. Help with test interpretation

    Hi all I'm doing some research and have run a few kolmogorov- smirnov tests on my data. My question is whether the magnitude of the values have...

    Started by Shakste‎, 08-11-2012 03:46 PM
    • Replies: 2
    • Views: 1,693
    08-17-2012, 01:00 PM Go to last post
  48. Which test to use / Spearman's Rank Order correlation

    I am trying to find a relationship between two firm performance scores - how board diversity score (independent variable) affects companies' social...

    Started by jamai‎, 08-14-2012 05:56 AM
    • Replies: 2
    • Views: 3,639
    08-14-2012, 09:31 AM Go to last post
  49. Question Which tests? Clarification plz!

    Hi all! I’m currently doing some research and I’m a bit of a novice so wanted to check if I was on the right lines with the statistical tests I’m...

    Started by Pippy‎, 08-14-2012 07:58 AM
    • Replies: 2
    • Views: 1,928
    08-17-2012, 01:18 PM Go to last post
  50. Estimating parameters using a different method?

    Hi, I have a probability distribution which has two parameters \alpha and \beta I re-parametrized the distribution such that the new...

    Started by arun‎, 08-16-2012 02:01 AM
    • Replies: 2
    • Views: 1,115
    08-16-2012, 08:43 AM Go to last post
  51. Autocorrelation of panel data: need literature!

    I have (so-called) dynamical monte carlo model of a number of identical chains within simulation box And i've measured some data (like radius of...

    Started by icegood‎, 08-21-2012 06:13 AM
    • Replies: 2
    • Views: 1,858
    08-24-2012, 11:38 AM Go to last post
  52. Question Pearson's chi-test for more than 2x2

    So, I have one stat book (Discovering Statistics by Andy Field; great book) that discusses Pearson's chi-test and how it's only applicable to a 2x2...

    Started by Trolle‎, 08-22-2012 12:27 PM
    chi square, contingency table, pearson chi square, spss
    • Replies: 2
    • Views: 3,010
    08-23-2012, 04:30 AM Go to last post
  53. What test to use?

    I wonder if there are demographic variables (e.g., level of training, place of practice, age served) that determine knowledge on suicide. In my...

    Started by picaritos‎, 08-26-2012 05:22 PM
    • Replies: 2
    • Views: 1,824
    08-27-2012, 09:30 AM Go to last post
  54. Question Test for symmetry? [Please]

    (This was posted in a different sub-section of the forum, but has remained unanswered for over a month. I'm posting it here in the hopes of getting a...

    Started by Gandalf‎, 08-28-2012 12:18 AM
    distribution, non parametric, symmetry, test
    • Replies: 2
    • Views: 1,248
    09-30-2012, 11:35 PM Go to last post
  55. Which test for manipulation check?

    In my research, 6 different scenarios were randomly assigned to the participants. The scenarios consisted of 2, 4 of 6 items and if these items were...

    Started by km88‎, 08-30-2012 02:09 PM
    • Replies: 2
    • Views: 10,825
    08-31-2012, 02:25 AM Go to last post
  56. Bayesian model checking: a problem with Gelman's chi-squared test

    So, I foolishly tried to implement a test Gelman and his colleagues propose to determine whether observed data actually fits a model (Bayesian Data...

    Started by lostsoul‎, 09-09-2012 12:06 PM
    bayesian, gelman, model checking, test statistic
    • Replies: 2
    • Views: 2,671
    09-11-2012, 09:21 PM Go to last post
  57. [SOLVED] help with some sums and squares please? :)

    hey everyone! how are you all doing? so... thing. i'm having trouble following the algebraic steps on an article i'm reading. my math sumation...

    Started by spunky‎, 09-26-2012 05:19 PM
    • Replies: 2
    • Views: 2,910
    09-26-2012, 05:51 PM Go to last post
  58. Multiple comparisons problem

    Dear all, In my research I frequently work with multi-channel EEG data, which yield data that are often subject to the multiple-comparisons...

    Started by Metansu‎, 10-01-2012 06:52 AM
    • Replies: 2
    • Views: 1,499
    10-01-2012, 07:54 AM Go to last post
  59. Find Total Utility Consumed

    Hi, I have snapshots of electricity cosumption data. For eg. at 4:00 am, the consumption is 3000 kw at 4:15 am, the consumption is 15205 kw at...

    Started by suhana‎, 09-30-2012 11:01 PM
    energy consumed
    • Replies: 2
    • Views: 1,120
    09-30-2012, 11:23 PM Go to last post
  60. data analysis for likert scale

    i have a group of variables being measured on a likert scale from 1 to 5, the agreement or disagreement of these variables will help me know the...

    Started by akluima‎, 10-01-2012 04:30 AM
    • Replies: 2
    • Views: 1,678
    10-01-2012, 08:39 AM Go to last post

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