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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: 18,696
    10-11-2014, 12:02 PM Go to last post
  1. Census & tests for significance?

    I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

    Started by pbakker‎, 11-12-2010 09:35 AM
    • Replies: 6
    • Views: 6,100
    11-12-2010, 02:09 PM Go to last post
  2. ranking and meta-analysis

    Hi everybody, I have a problem regarding some statistical evaluations. I want to conduct a meta-analysis of several papers. The goal of the...

    Started by Leosw1981‎, 11-10-2010 11:39 AM
    • Replies: 2
    • Views: 5,689
    11-11-2010, 03:02 AM Go to last post
  3. Inter rater reliability

    I'm hoping someone might be able to help me figure out how best to analyse the data I have. For my research, subjects each create 3 small image...

    Started by willpy‎, 11-10-2010 11:45 AM
    • Replies: 0
    • Views: 3,550
    11-10-2010, 11:45 AM Go to last post
  4. Can you combine survey responses for a Confidence Interval

    Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

    Started by lincoln5‎, 11-06-2010 01:31 PM
    • Replies: 2
    • Views: 2,533
    11-10-2010, 11:04 AM Go to last post
  5. Volume of confidence intervals for Multinomial distributions

    Hi, I'd like to know the formula for calculating the volume of the confidence (rectangular) region for the multinomial distribution. I've already...

    Started by cyb3r.dani‎, 11-09-2010 09:50 AM
    • Replies: 0
    • Views: 3,369
    11-09-2010, 09:50 AM Go to last post
  6. Need help with large data set. Nested/factorial??

    I'm working with my field data and trying to understand the best way to analyze it. I have: 6 Sites 2 tide-pools per site Each pool has at...

    Started by aesopclimber‎, 11-08-2010 04:06 AM
    • Replies: 2
    • Views: 2,572
    11-08-2010, 07:51 PM Go to last post
  7. Question about ANOVA alternatives for non-normally distributed data

    I am trying to analyze data from an experiment where participants take two reading tests, to compare the effectiveness of two different dictionaries...

    Started by KanjiTester‎, 11-08-2010 08:58 AM
    • Replies: 0
    • Views: 5,667
    11-08-2010, 08:58 AM Go to last post
  8. Help with choice of nonparametric?

    Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

    Started by Confused_Claire‎, 11-06-2010 08:33 AM
    • Replies: 2
    • Views: 2,503
    11-07-2010, 02:57 AM Go to last post
  9. confidence interval GREGG estimator

    i have estimated different proportions based on a sample survey. The estimation is done with the GREGG estimator(because of problem with nonrespone)....

    Started by martinf‎, 11-05-2010 09:01 AM
    • Replies: 0
    • Views: 1,635
    11-05-2010, 09:01 AM Go to last post
  10. Correlation help needed!

    Hello, I am having trouble crunching some data and was wondering if someone could please walk me through it. I believe the correct test to use is...

    Started by Jessie14‎, 11-03-2010 10:52 PM
    • Replies: 1
    • Views: 2,387
    11-04-2010, 04:26 PM Go to last post
  11. Right Sample Size

    I am new to this blog and I am trying to learn statistics applied in Market Research. I have the following question: Suppose there is a population...

    Started by bsaikrishna‎, 11-03-2010 10:46 AM
    • Replies: 5
    • Views: 5,186
    11-04-2010, 12:12 PM Go to last post
  12. Arrow transformation response and predictors

    How to find the proper transformation of the response or predictors ? Is it simply to identify from the diagmostic plot ? Usually I apply...

    Started by purple‎, 11-03-2010 01:48 PM
    • Replies: 1
    • Views: 3,560
    11-03-2010, 03:08 PM Go to last post
  13. Linear estimator of mean

    Problem is solved! :)

    Started by _joey‎, 11-03-2010 05:19 AM
    • Replies: 0
    • Views: 1,850
    11-03-2010, 05:19 AM Go to last post
  14. 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: 3,043
    11-02-2010, 11:22 AM Go to last post
  15. 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: 6,459
    11-01-2010, 06:42 AM Go to last post
    • Replies: 0
    • Views: 2,044
    10-31-2010, 10:29 AM Go to last post
  16. 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: 1,542
    10-27-2010, 09:35 AM Go to last post
  17. 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: 6,812
    10-27-2010, 05:59 AM Go to last post
  18. 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: 5,175
    10-26-2010, 07:24 AM Go to last post
  19. 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: 4,069
    10-26-2010, 06:19 AM Go to last post
  20. 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: 1,637
    10-25-2010, 06:54 PM Go to last post
  21. 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: 2,837
    10-24-2010, 10:24 AM Go to last post
  22. "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: 3,871
    10-21-2010, 10:55 PM Go to last post
  23. 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: 3,953
    10-21-2010, 04:52 PM Go to last post
  24. 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: 2,267
    10-21-2010, 12:57 PM Go to last post
  25. 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: 2,196
    10-21-2010, 12:40 PM Go to last post
  26. 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: 3,546
    10-20-2010, 04:28 PM Go to last post
  27. 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: 1,843
    10-19-2010, 01:21 PM Go to last post
  28. 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: 2,832
    10-17-2010, 11:19 PM Go to last post
  29. 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: 3,463
    10-17-2010, 01:36 PM Go to last post
  30. 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: 6,396
    10-12-2010, 10:20 PM Go to last post
  31. 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: 3,352
    10-12-2010, 06:05 PM Go to last post
  32. 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: 22,967
    10-11-2010, 02:31 PM Go to last post
  33. 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: 2,959
    10-11-2010, 07:52 AM Go to last post
  34. 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: 2,525
    10-08-2010, 04:39 AM Go to last post
  35. 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: 14,588
    10-07-2010, 08:03 PM Go to last post
  36. 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: 6,622
    10-07-2010, 03:34 PM Go to last post
  37. 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: 5,762
    10-07-2010, 12:30 AM Go to last post
  38. 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: 14,700
    10-04-2010, 06:41 PM Go to last post
  39. 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: 3,954
    10-04-2010, 05:01 PM Go to last post
  40. 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: 5,296
    10-03-2010, 06:56 PM Go to last post
  41. 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: 2,675
    10-02-2010, 01:34 PM Go to last post
  42. 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: 1,992
    10-01-2010, 03:01 PM Go to last post
  43. 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: 2,425
    09-28-2010, 05:10 AM Go to last post
  44. 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: 2,542
    09-27-2010, 06:12 PM Go to last post
  45. 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: 6,652
    09-26-2010, 03:48 PM Go to last post
  46. 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: 3,230
    09-25-2010, 07:31 PM Go to last post
  47. 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: 3,335
    09-23-2010, 06:20 PM Go to last post
  48. 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: 7,075
    09-23-2010, 05:12 AM Go to last post
  49. 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: 5,066
    09-23-2010, 04:14 AM Go to last post
  50. 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: 2,984
    09-22-2010, 03:14 AM Go to last post
  51. 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: 2,055
    09-18-2010, 03:50 PM Go to last post
  52. 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: 1,775
    09-17-2010, 01:43 PM Go to last post
  53. 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: 9,338
    09-17-2010, 11:58 AM Go to last post
  54. 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: 1,972
    09-16-2010, 01:53 PM Go to last post
  55. 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: 1,624
    09-15-2010, 04:30 AM Go to last post
  56. 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: 2,172
    09-14-2010, 02:12 PM Go to last post
  57. 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: 3,281
    09-13-2010, 08:34 PM Go to last post
  58. 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: 2,347
    09-11-2010, 10:33 AM Go to last post
  59. 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: 7,531
    09-10-2010, 03:20 PM Go to last post

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