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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: 18,758
    10-11-2014, 12:02 PM Go to last post
  1. Using measures with different Likert-type scaling

    I need some advice regarding methodology. I am creating a single questionnaire comprised of 4 different measures - all with likert-type scaling. ...

    Started by Nebulous13‎, 08-15-2010 01:08 PM
    • Replies: 3
    • Views: 5,156
    08-19-2010, 12:28 AM Go to last post
  2. Exclamation Suggest an Unbiased estimator for θ

    Prove that the maximum of the random sample of size 'n' from uniform distribution over is a biased but a consistent estimator of θ. Suggest a n...

    Started by amul28‎, 08-19-2010 12:59 AM
    • Replies: 3
    • Views: 91,699
    08-19-2010, 03:49 AM Go to last post
  3. Question Sample size calculation formulae

    Sample size calculation formulae Can someone please let me know where I can find a suitable 'Sample Size calculation Formula'? A standard...

    Started by sachitha‎, 08-21-2010 11:07 AM
    • Replies: 2
    • Views: 3,722
    08-21-2010, 11:38 AM Go to last post
  4. paired T-test or anova

    Dear all just a quick simple one this time. if i had two sets of runners (in a race) for example and these two groups were linked only by the fact...

    Started by yoma819‎, 08-22-2010 05:51 PM
    • Replies: 7
    • Views: 5,608
    08-23-2010, 10:53 PM Go to last post
  5. Interpret statistical data - Relative risk, power, and significance?

    "We estimated that a sample size of 1240 patients followed up for an average of 3 years would lead to detection of a 33% difference in the relative...

    Started by nana0709‎, 08-27-2010 08:14 AM
    • Replies: 4
    • Views: 6,290
    08-28-2010, 03:53 AM Go to last post
  6. Negative binomial regression / poisson regression

    Does anyone have experience with STATA? and more specifically how to conduct a negative binomial regression in stata? My problem is that i dont...

    Started by paul de boer‎, 08-27-2010 09:56 AM
    • Replies: 2
    • Views: 8,841
    08-28-2010, 04:24 AM Go to last post
  7. repeated measures MANOVA on mixed design

    Hi folks, I have data from a drug study that I am trying to perform statistical analysis on, and am not sure if my approach is correct. I was...

    Started by simhan4‎, 08-30-2010 03:24 PM
    • Replies: 0
    • Views: 7,073
    08-30-2010, 03:24 PM Go to last post
  8. Comparing means from SAME sample

    I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

    Started by HumanParticipantResearch‎, 09-01-2010 01:35 PM
    • Replies: 0
    • Views: 3,672
    09-01-2010, 01:35 PM Go to last post
  9. Combining outcome scores: standardising case and control data

    Hi tehre, I have 2 separate tasks that I ask a group of individuals to complete, half the group are given a drug after the baseline measure is...

    Started by JG28‎, 09-05-2010 08:02 PM
    • Replies: 0
    • Views: 3,867
    09-05-2010, 08:02 PM Go to last post
  10. Does anybody have a calculus example for Bartlett and Levene tests?

    Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

    Started by quantster‎, 09-01-2010 02:54 PM
    • Replies: 14
    • Views: 6,451
    09-07-2010, 05:59 AM Go to last post
  11. non-parametric 1-way anova, but samples not independent

    Hi, I'm in a quandary. Samples that I wish to analyse are ordinal and should be treated as a matched (dependent) since they were drawn from a...

    Started by DrCJones‎, 09-07-2010 01:51 AM
    • Replies: 1
    • Views: 4,284
    09-07-2010, 07:27 AM Go to last post
  12. Question Regarding Results from Matched Pair T-Test versus Tamhane's Test

    I have a group of data from a survey regarding attitudes. The data was collected pre and post intervention on a group of students. The data n is...

    Started by vbode‎, 09-06-2010 07:08 AM
    • Replies: 1
    • Views: 4,525
    09-07-2010, 10:44 AM Go to last post
  13. puzzling change in effect in multilevel linear regression; suppressor effect?

    In my analysis of educational achievement of second generation migrants, I modelled the effect of mother's and father's education in two ways, which...

    Started by Soporiferous‎, 09-02-2010 08:48 AM
    • Replies: 3
    • Views: 4,481
    09-09-2010, 05:56 AM Go to last post
  14. Finding the cov matrix of MLE using Hessian

    To properly calculate the covariance of an MLE you would need to find the inverse of the Fisher information matrix, evaluated at the MLE. And this...

    Started by paralleluniverse‎, 09-10-2010 11:02 AM
    • Replies: 1
    • Views: 7,559
    09-10-2010, 03:20 PM Go to last post
  15. When do we use...

    just out of curiosity.... where is Mathematical Statistics, if at all, do we use modern algebra (i.e Groups, Rings,....) ?

    Started by WeeG‎, 09-11-2010 09:23 AM
    • Replies: 3
    • Views: 2,361
    09-11-2010, 10:33 AM Go to last post
  16. Red face Confused regarding Principal Component Analysis

    Hi all, I have a scenario in which I was advised to use Principle Component Analysis but my knowledge of stats is fairly rudimentary so I am...

    Started by yayo1984‎, 09-13-2010 01:40 AM
    • Replies: 11
    • Views: 3,293
    09-13-2010, 08:34 PM Go to last post
  17. Markov Chain Monte Carlo method

    I am new to Markov chain Monte Carlo method. What's the difference between MCMC and normal Monte Carlo method, and what are the major applications of...

    Started by surfreta‎, 09-14-2010 02:12 PM
    • Replies: 0
    • Views: 2,180
    09-14-2010, 02:12 PM Go to last post
  18. Help!

    I am stuck in trying to figure out which methodology I should use. I am working with survey data that quantifies certain attributes about managers...

    Started by stats_rookie‎, 09-15-2010 04:30 AM
    • Replies: 0
    • Views: 1,633
    09-15-2010, 04:30 AM Go to last post
  19. public safety risks

    I think some US regulatory agencies are taking advantage of the public's "Zero Risk Bias" to oversell safety in order to profit, and I would like to...

    Started by Outlier‎, 09-16-2010 01:53 PM
    • Replies: 0
    • Views: 1,979
    09-16-2010, 01:53 PM Go to last post
  20. Comparison of time series

    Hi there, firstly I would like to say that I'm newbie here, so hi everyone, and please be patient if I do something wrong. And sorry for my level...

    Started by nofuj‎, 09-13-2010 01:35 AM
    • Replies: 2
    • Views: 9,364
    09-17-2010, 11:58 AM Go to last post
  21. question on statistical analysys

    Hi, I am a java developer and don't know much about statistics so please pardon me if I have posted in wrong forum or asking wrong question. I...

    Started by annbasso‎, 09-17-2010 01:43 PM
    • Replies: 0
    • Views: 1,780
    09-17-2010, 01:43 PM Go to last post
  22. Analysis with multiple unordered factors?

    Hi everyone, I hope some expert out there can point me in the right direction on this. I have a binomial outcome (A/B) and a number of...

    Started by hrj‎, 09-18-2010 03:50 PM
    • Replies: 0
    • Views: 2,072
    09-18-2010, 03:50 PM Go to last post
  23. How many random events to cover everything with 95% confidence?

    Ok so I have what I believe to be a rather easy question, which I even feel I should be able to solve myself, but I can't... I hope someone can help...

    Started by I_do‎, 09-15-2010 02:28 PM
    • Replies: 4
    • Views: 3,002
    09-22-2010, 03:14 AM Go to last post
  24. Spearman-Brown also for the effect of additional raters?

    To achieve higher reliability in a questionnaire, it is common to add more items to the questionnaire. If the new items are parallel to the previous...

    Started by Per‎, 07-26-2010 02:04 AM
    • Replies: 5
    • Views: 5,098
    09-23-2010, 04:14 AM Go to last post
  25. Working With Population Data

    Is there a way to determine if a difference is significant when using entire population data? For example if i see that the difference between test...

    Started by StevenK‎, 08-23-2010 06:14 PM
    • Replies: 9
    • Views: 7,104
    09-23-2010, 05:12 AM Go to last post
  26. Measuring the Association between Nominal variables

    I currently have a sizable dataset containing question-answer variables with multiple levels (4-8) that are unordered and a variable Id like to...

    Started by rcclark2‎, 09-23-2010 06:20 PM
    • Replies: 0
    • Views: 3,363
    09-23-2010, 06:20 PM Go to last post
  27. HLM Sample size and Equality of Groups

    Hi, I have 3 data points (Fall, Winter, Spring) regarding the oral reading fluency of 2 groups of children collected over a school year....

    Started by gracie3‎, 09-25-2010 07:31 PM
    • Replies: 0
    • Views: 3,253
    09-25-2010, 07:31 PM Go to last post
  28. Numeric algorithm to compute probability for Beta Binomial

    Dear all, I am trying to find a numeric method that can be handled at least by Excel to compute the probabilities of Beta Binomial distribution....

    Started by LLICZ‎, 09-24-2010 01:04 PM
    • Replies: 2
    • Views: 6,673
    09-26-2010, 03:48 PM Go to last post
  29. Confused: correlated groups Chi Square?

    Hi all, I have three groups: Group C is a subset of Group B which is in turn a subset of Group A. Members of Groups B and C were not randomly...

    Started by tandanus‎, 09-27-2010 06:12 PM
    • Replies: 0
    • Views: 2,553
    09-27-2010, 06:12 PM Go to last post
  30. Learning Statistics by myself

    I have a fair grasp of linear algebra and calculus at an undergraduate level and had a couple of questions about probability statistics and data...

    Started by philiprea‎, 09-28-2010 05:10 AM
    • Replies: 0
    • Views: 2,435
    09-28-2010, 05:10 AM Go to last post
  31. Thumbs down Analyzing statistics reports

    I am working on analyzing a report regarding ginger use in alleviating nausea/vomiting in pregnancy. I had my professor look over my report because...

    Started by jenclark242‎, 10-01-2010 03:01 PM
    • Replies: 0
    • Views: 2,012
    10-01-2010, 03:01 PM Go to last post
  32. Arrow My professor told me that a t-test wasn't the correct procedure to use in a report

    In my report it states: "the incidence of vomiting after treatment showed a 9% decrease in the control group, which was not significantly...

    Started by jenclark242‎, 10-01-2010 03:13 PM
    • Replies: 2
    • Views: 2,692
    10-02-2010, 01:34 PM Go to last post
  33. Z-test for different proportions: why are they all sig. different?

    Hi all, so I am wondering what about my data is making all of my Z-tests for different proportions sig. different (and it says actual conf. level...

    Started by MarilynCM‎, 10-03-2010 11:31 AM
    • Replies: 5
    • Views: 5,317
    10-03-2010, 06:56 PM Go to last post
  34. Post Meta-Analysis Procedure

    Hi all, I recently took upon the challenge of conducting a meta-analysis of studies in a particular domain and I am facing an obstacle on which...

    Started by yayo1984‎, 10-04-2010 05:01 PM
    • Replies: 0
    • Views: 3,992
    10-04-2010, 05:01 PM Go to last post
  35. Question Is it correct to use Pearson correlation for variables measured on a "Likert scale"?

    Hi All, I'm conducting a research testing the relationship of 2 variables which are measured on agreement scales. Is it correct to use Pearson...

    Started by sachitha‎, 10-04-2010 11:40 AM
    • Replies: 2
    • Views: 14,794
    10-04-2010, 06:41 PM Go to last post
  36. Summary variable for adversities

    Fellow members, I'm doing research currently on the effects of childhood adversities on development of the autonomic nervous system. I'm a little...

    Started by Link‎, 10-05-2010 11:55 PM
    • Replies: 8
    • Views: 5,811
    10-07-2010, 12:30 AM Go to last post
  37. Correlation Proof

    Hi guys, wondering if you could help me with a proof that I am trying to figure out. Here it is... Corr (A, B) = 0 and Corr (B, C) = 0. This...

    Started by statsq45‎, 09-25-2010 06:24 PM
    • Replies: 7
    • Views: 6,644
    10-07-2010, 03:34 PM Go to last post
  38. Red face Using likert scale data and nominal, ratio scale data for Partial Correlation

    Hi All, If Pearson correlation is used through Partial Correlation (on SPSS) for measuring variables measured on a Likert Scale, can we use...

    Started by sachitha‎, 10-04-2010 11:43 AM
    • Replies: 3
    • Views: 14,663
    10-07-2010, 08:03 PM Go to last post
  39. suitable statistical method

    Hi all, This is my first post here. I have a data (Subset-A) requiring statistical treatment. Descriptive statistics of the data: Size =...

    Started by asanjuan‎, 10-04-2010 04:37 AM
    • Replies: 4
    • Views: 2,539
    10-08-2010, 04:39 AM Go to last post
  40. Thumbs down Internal consistency reliability

    Hi there, I have a question about the internal consistency reliability. In a within-subject design, I created a 13-item of self-repeated 9-point...

    Started by C_SH_Yeh‎, 10-11-2010 07:52 AM
    • Replies: 0
    • Views: 2,970
    10-11-2010, 07:52 AM Go to last post
  41. Arrow Small sample size, correlation

    Ok, I am helping someone to run spss on his data,He just wants to know the results and not advice.But still I am hating my gut because his method...

    Started by SadieKhan‎, 10-11-2010 12:09 AM
    • Replies: 13
    • Views: 23,040
    10-11-2010, 02:31 PM Go to last post
  42. Uncertainty in Sample Dispersion

    I'm an astronomer and I have a statistics question that I'm not sure how to answer. I'll try to generalize the problem in a clear way. I have a...

    Started by Astrostatistics‎, 10-12-2010 05:40 PM
    • Replies: 1
    • Views: 3,369
    10-12-2010, 06:05 PM Go to last post
  43. Help correlating Likert scale data with demographic profile

    I'm not knowledgeable about statistics, so please excuse any mistakes in phrasing. Our professor is currently on leave, and I don't have anybody else...

    Started by violet‎, 10-12-2010 02:57 AM
    • Replies: 4
    • Views: 6,423
    10-12-2010, 10:20 PM Go to last post
  44. Weighting survey answers - different approaches

    Hej! I've quite recently changed job moving both to another country and from private to public sector. I have both before and currently worked as...

    Started by m66‎, 08-24-2010 05:09 PM
    • Replies: 1
    • Views: 3,482
    10-17-2010, 01:36 PM Go to last post
  45. Normal Extreme Values

    Mostly I have been answering questions, but today I am asking one: what is the distribution of the maximum of n draws from a normal distribution? ...

    Started by ichbin‎, 10-15-2010 05:49 PM
    • Replies: 2
    • Views: 2,850
    10-17-2010, 11:19 PM Go to last post
  46. Some feedback on Causal Inference Theory

    Hello fellow members, Background: I'm taking a causal inferences class this semester that is teaching me how to go beyond statistical models to...

    Started by Link‎, 10-19-2010 01:21 PM
    • Replies: 0
    • Views: 1,848
    10-19-2010, 01:21 PM Go to last post
  47. IQR and Standard Deviation

    Hello everyone, I'm trying to determine if there is a relationship that exists between IQR and Standard Deviation in all distributions, not just...

    Started by jgills‎, 10-20-2010 06:22 AM
    • Replies: 2
    • Views: 3,554
    10-20-2010, 04:28 PM Go to last post
  48. Special kind of latin square?

    I'm not sure if what I'm about to describe is used in statistics, but if so I'd like to know if it has a special name to distinguish it from other...

    Started by op1‎, 10-21-2010 04:19 AM
    • Replies: 1
    • Views: 2,207
    10-21-2010, 12:40 PM Go to last post
  49. type of study?

    In a poll of 20,000 randomly selected college seniors, it was determined that 95% of them have a cell phone. What is the type of this...

    Started by SadieKhan‎, 10-21-2010 08:41 AM
    • Replies: 7
    • Views: 2,281
    10-21-2010, 12:57 PM Go to last post
  50. Unhappy Requesting Jenks natural breaks algorithm for Statistica

    Hello forum, I am studying particle size distributions and have been advised to locate an R algorithm/routine to implement Jenks natural breaks...

    Started by Robertmacdonald‎, 10-05-2010 08:33 AM
    • Replies: 1
    • Views: 3,975
    10-21-2010, 04:52 PM Go to last post
  51. "Uninformative" priors paradox?

    Bayesians, puzzle me this: If you are trying to learn the $p$ parameter of a binomial distribution, the least informative prior is the uniform...

    Started by serapio‎, 10-16-2010 10:15 PM
    • Replies: 1
    • Views: 3,894
    10-21-2010, 10:55 PM Go to last post
  52. Calculating a sample size for a study

    Hi, I am trying to do a study on patients with a certain disease. I would like to retrospectively review their charts and check whether there were...

    Started by yr20045‎, 10-23-2010 02:34 PM
    • Replies: 3
    • Views: 2,858
    10-24-2010, 10:24 AM Go to last post
  53. Constructing Latin Squares?

    I've come across some blurbs online about how to create or arrange latin squares which are complete, or quasi-complete. However the examples...

    Started by op1‎, 10-24-2010 02:53 PM
    • Replies: 1
    • Views: 1,641
    10-25-2010, 06:54 PM Go to last post
  54. when Bootstrap Correlation coefficient (Pearson) con be used?

    Hi! Though I know the mechanics of the bootstrap methods, I am do not manage to find in literature a clear-cut explanation about when and in what...

    Started by gianmarco‎, 10-26-2010 06:19 AM
    • Replies: 0
    • Views: 4,104
    10-26-2010, 06:19 AM Go to last post
  55. Question Q-Q plot

    The Q-Q plot is more sensitive to deviances from normality in the tails of the distribution, whereas the normal probability plot is more sensitive to...

    Started by SadieKhan‎, 10-26-2010 07:21 AM
    • Replies: 1
    • Views: 5,194
    10-26-2010, 07:24 AM Go to last post
  56. how would you comment this frequency distribution?

    Hi! I would like to have some feedback on the attached frequency distribution histogram. It displays the bootstrap distribution of Spearman rs. ...

    Started by gianmarco‎, 10-27-2010 05:59 AM
    • Replies: 0
    • Views: 6,842
    10-27-2010, 05:59 AM Go to last post
  57. Assumed autocorrelation

    Hi all-- I apologize if this is an incredibly naive question, but I'm currently working with a signal and I need to find the "assumed lag-1...

    Started by beagle48‎, 10-27-2010 09:35 AM
    • Replies: 0
    • Views: 1,554
    10-27-2010, 09:35 AM Go to last post
    • Replies: 0
    • Views: 2,059
    10-31-2010, 10:29 AM Go to last post
  58. Variance estimation

    A simple question we have a random sample n=2 with X, Y drawn from a normal distribution N~(0, \sigma^2). Is V=\frac{X^2}{2}+\frac{Y^2}{2} a...

    Started by _joey‎, 10-31-2010 05:09 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 6,501
    11-01-2010, 06:42 AM Go to last post
  59. Exclamation what am i supposed to do?

    Let X_1,X_2,........,X_n ~ N(\mu,\sigma^2), both \mu and \sigma^2 unknown. Find the value of b which minimizes the MSE of the estimator...

    Started by Sambit‎, 11-02-2010 01:51 AM
    • Replies: 8
    • Views: 3,054
    11-02-2010, 11:22 AM Go to last post

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