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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: 18,620
    10-11-2014, 12:02 PM Go to last post
  1. What N to record for regression table?

    Is it the outcome variable (dependent variable) N that I report in a regression table?

    Started by godfather‎, 08-20-2009 07:08 PM
    • Replies: 0
    • Views: 1,904
    08-20-2009, 07:08 PM Go to last post
  2. Question on omega squared...please help!

    I have just obtained the output for a one way repeated measures ANOVA and have read that it is useful to report the size of the effect using omega...

    Started by nogoodatstats‎, 08-20-2009 03:28 PM
    • Replies: 0
    • Views: 5,710
    08-20-2009, 03:28 PM Go to last post
  3. Violation of sphericity...

    If you seem to be violating the assumption of sphericity when undertaking several separate one way repeated-measures ANOVAs and therefore have to...

    Started by nogoodatstats‎, 08-20-2009 03:26 PM
    • Replies: 0
    • Views: 3,778
    08-20-2009, 03:26 PM Go to last post
  4. bounds of beta distributions

    I'd like to estimate the lower and upper bounds of a general beta distribution, using 5 and 95 percentiles. I already know how to estimate the mean...

    Started by cem48105‎, 08-20-2009 11:20 AM
    • Replies: 0
    • Views: 2,136
    08-20-2009, 11:20 AM Go to last post
  5. Multiple Comparison Correction - Help needed !

    I know the concept that one should have statistical correction if multiple comparison are made between means. Such as the well-known bonferroni...

    Started by doctor‎, 11-02-2008 11:04 AM
    • Replies: 1
    • Views: 4,012
    08-20-2009, 09:42 AM Go to last post
  6. Fisher information matrix

    Hello everybody, I read here that the Fisher information matrix was the inverse of covariance matrix. How can I show that ? My definition of...

    Started by Pingouinche‎, 08-20-2009 09:01 AM
    • Replies: 0
    • Views: 4,203
    08-20-2009, 09:01 AM Go to last post
  7. comparing means\unequal(small) size group

    Hi, I am about to use student t test to compare the mean of two independent groups. The first group sample size is 4 and another one is 24. Can I...

    Started by apahliani‎, 08-16-2009 03:51 PM
    • Replies: 4
    • Views: 26,261
    08-18-2009, 12:00 AM Go to last post
  8. Research Question

    Hey Everyone hopefully you can help me. My last hope ;-). For a Stat's and Research Exam (on Monday) I need to answer the following questions: Draw...

    Started by jonnymax‎, 08-14-2009 05:28 AM
    • Replies: 0
    • Views: 2,429
    08-14-2009, 05:28 AM Go to last post
  9. Gumbel Copula

    Does anybody have some code or a paper to show how to simulate n dimensional Gumbel copula ?

    Started by kfcnhl‎, 08-12-2009 02:55 PM
    • Replies: 0
    • Views: 2,375
    08-12-2009, 02:55 PM Go to last post
  10. I have no idea where to start!!

    I need to analyse data for research--- There are 3 outcomes (1,2,3) and two companies (a,b) with 3 departments each (a1,a2,a3 and 1b,2b,3b). I...

    Started by donkey1702‎, 07-30-2009 12:08 AM
    • Replies: 2
    • Views: 2,415
    08-05-2009, 05:36 PM Go to last post
  11. return series

    why does taking a log make a return series continous? ln(r(t)/r(t-1))

    Started by kfcnhl‎, 07-28-2009 08:22 AM
    • Replies: 0
    • Views: 1,816
    07-28-2009, 08:22 AM Go to last post
  12. Question How to compute significance here? (And why?)

    Hello, method test_set_size correct accuracy A 898 188 0.209 A+ 898 210 0.234 A++ ...

    Started by marcC‎, 07-28-2009 06:02 AM
    • Replies: 0
    • Views: 3,230
    07-28-2009, 06:02 AM Go to last post
  13. Within Subjects OXO and confounds

    Greetings! I'm helping a friend in the medical field with his research and I have an I/O Psych background - meaning lots of regression and...

    Started by IOPsy‎, 06-11-2009 11:57 AM
    • Replies: 1
    • Views: 3,487
    07-19-2009, 09:33 PM Go to last post
  14. Question F-value and Post-hoc tests conflict

    What does it mean when you obtain a significant F-value for an ANOVA but when you perform the post-hoc test no pairwise comparisons are significant?...

    Started by mathgeek10‎, 07-17-2009 02:40 PM
    • Replies: 0
    • Views: 3,869
    07-17-2009, 02:40 PM Go to last post
  15. Using Linear slope estimate as independent variable in regression analysis

    Hi all, I am doing an analysis of longitudinal growth data and would like to compare my methods to other studies but am having trouble finding...

    Started by rrsterling‎, 07-15-2009 01:01 AM
    • Replies: 0
    • Views: 3,754
    07-15-2009, 01:01 AM Go to last post
  16. Bonferroni Correction Factor !!!

    Hello, What exactly Bonferroni correction factor means? Why we calculate it in our study? Thanks, Bala

    Started by Bala‎, 09-26-2008 02:44 AM
    • Replies: 9
    • Views: 25,671
    07-14-2009, 06:33 AM Go to last post
  17. Comparing likelihood ratios:please help!!!

    Hi to all. I desperately need a method to compare positive and negative likelihood ratios of a diagnostic test within two strata (e.g. likelihood...

    Started by George76‎, 07-13-2009 07:20 PM
    • Replies: 0
    • Views: 2,807
    07-13-2009, 07:20 PM Go to last post
  18. Powerrankings for Football

    This is my 1st post and decided to register. Just wanted to say there is a lot of smart people running around here and i love reading the articles....

    Started by saints51‎, 07-13-2009 12:20 PM
    • Replies: 0
    • Views: 2,280
    07-13-2009, 12:20 PM Go to last post
  19. Dissertation statistics

    Hi, I am currently writing my dissertation on long term effects of CEO successions, ie. are there any statistically significant effects on measures...

    Started by estho‎, 07-13-2009 05:21 AM
    • Replies: 0
    • Views: 1,890
    07-13-2009, 05:21 AM Go to last post
  20. Repeated Measures with a baseline Covariate

    I am in the final stages (i.e., manuscript is due on July 21) of my dissertation and I am stuck on what seemed to be a minor stats issue. This issue...

    Started by jennifer.r.daniels‎, 07-06-2009 02:46 PM
    • Replies: 0
    • Views: 4,692
    07-06-2009, 02:46 PM Go to last post
  21. confidence interval for combined data

    Hi everyone, I'm new here, so forgive me if I don't get something quite right. I have a question for how best to do a confidence analysis of a set...

    Started by Trey‎, 06-22-2009 12:57 PM
    • Replies: 5
    • Views: 8,110
    06-24-2009, 02:32 PM Go to last post
  22. two probability levels in regression tables

    I was wondering if is is common practice to identify betas that are significant at either the .05 and .001 level. e.g., If I decide to set my p level...

    Started by godfather‎, 06-24-2009 01:14 AM
    • Replies: 1
    • Views: 2,962
    06-24-2009, 01:24 AM Go to last post
  23. MDS with confusion matrix

    Hi, I want to run a MDS from some data of close set identification. Therefore, I have a 12X12 confusion matrix and I need to transform it to a...

    Started by zozo‎, 06-23-2009 07:12 PM
    • Replies: 0
    • Views: 2,787
    06-23-2009, 07:12 PM Go to last post
  24. sample size - power calculations

    Hi, would be great if anybody could help me on this. I want to estimate the impact of an independent variable x (lets say a social program) on the...

    Started by flo2222‎, 06-05-2009 10:12 AM
    • Replies: 1
    • Views: 4,321
    06-23-2009, 12:01 AM Go to last post
  25. (non-)parametric test dilemma

    I want to compare means of 6 variables and to do correlation analysis. I did Kolmogorov-Smirnov test and it showed that 3 of them are normally...

    Started by rmil‎, 06-17-2009 10:45 AM
    • Replies: 7
    • Views: 7,175
    06-22-2009, 07:50 PM Go to last post
  26. choosing basic test: logistic regression or multiple chi square?

    -------------------------------------------------------------------------------- Hi, I'm new to statistics and am working on a project for...

    Started by Chris Webber‎, 06-22-2009 10:41 AM
    • Replies: 0
    • Views: 3,553
    06-22-2009, 10:41 AM Go to last post
  27. generate overdispersed poisson data

    Hi there, Can anyone tell me how to produce overdispersed poisson data? An algorithm or something? I find it difficult. Thanx in advance for...

    Started by leo nidas‎, 06-17-2009 08:53 AM
    • Replies: 5
    • Views: 7,078
    06-19-2009, 03:17 AM Go to last post
  28. Help - problem

    Hi I have a variable VA and want to know if there are significant differences in this variable between group A and group B. N = 93 samples...

    Started by bluecat‎, 06-16-2009 11:47 AM
    • Replies: 1
    • Views: 2,275
    06-17-2009, 10:15 PM Go to last post
  29. Suppressor

    Hi, I am attempting to conduct a regression analysis in a study examining patient and caregiver variables and their impact on formal care...

    Started by Roisin0103‎, 04-03-2009 09:44 AM
    • Replies: 2
    • Views: 4,122
    06-17-2009, 04:18 PM Go to last post
  30. Absolute or relative changes?

    I would like to compare the changes in salt excretion caused by a saline infusion in a group of patients studied under high sodium and low sodium...

    Started by Carolina‎, 06-16-2009 04:57 AM
    • Replies: 0
    • Views: 2,940
    06-16-2009, 04:57 AM Go to last post
  31. A basic question. Pls help...

    Hi, When discussing the large sample theory, the professor in my econometrics course said sth that I found hard to grasp. He said something...

    Started by promaccat‎, 06-07-2009 01:21 PM
    • Replies: 1
    • Views: 2,533
    06-15-2009, 08:07 PM Go to last post
  32. Pairwise comparisons

    If anyone has ANY idea at all i would be most appreciative My lab report includes pairwise comparisons, I have the SPSS output before me but I...

    Started by ne883‎, 06-03-2009 07:52 PM
    • Replies: 2
    • Views: 29,378
    06-15-2009, 08:05 PM Go to last post
  33. ANOVA weighted means?

    Hi Chaps, I am trying to run a comparison between two groups - patients and staff - ratings of the quality of life on a ward. Simple enough,...

    Started by piblet‎, 06-05-2009 08:37 AM
    • Replies: 3
    • Views: 5,741
    06-05-2009, 12:15 PM Go to last post
  34. Neural Networks

    Hi, I am really interested to explore the use of neural network analysis to create a model that predicts my variable. I would like to know if...

    Started by lpmelo‎, 06-05-2009 04:38 AM
    • Replies: 0
    • Views: 2,448
    06-05-2009, 04:38 AM Go to last post
  35. Predicting Order of NHL draft

    Hi, I'm a huge a NHL fan and I thought it would be interesting to figure out the probability of a particular player being picked at a particular...

    Started by MadCanuck‎, 06-02-2009 01:02 PM
    • Replies: 0
    • Views: 1,916
    06-02-2009, 01:02 PM Go to last post
  36. school project

    Hello, I am doing a project for school and am in need of some advice. I want to do something to do with the gubernatorial primary election in NJ...

    Started by givesyouwings‎, 05-30-2009 09:33 PM
    • Replies: 0
    • Views: 1,994
    05-30-2009, 09:33 PM Go to last post

    Within the firm I work for the question exists whether there are common characteristics within (between) more or less 900 cases/dossiers which we...

    Started by dennishoogeboom‎, 05-18-2009 05:05 AM
    • Replies: 4
    • Views: 3,084
    05-27-2009, 08:39 PM Go to last post
  38. How to generate right censored data

    Hi all, I want to generate some data from a given distribution, let say exponential distribution. But I do not now how. Any help would be...

    Started by amin.hassanzadeh‎, 05-27-2009 04:18 PM
    • Replies: 1
    • Views: 5,137
    05-27-2009, 04:34 PM Go to last post
  39. Red face Non profit Intern needs your help to save the world!!

    Hi there, Two (hopefully) simple questions. I've taken Statistics in school however I am an intern at a very small non profit and I just want to...

    Started by stefan_p‎, 05-27-2009 08:45 AM
    • Replies: 0
    • Views: 2,360
    05-27-2009, 08:45 AM Go to last post
  40. Smile what test to do?

    Hi Would be grateful for a little guidance. I have a set of data with a mix of continous and categorical data I am trying to see if there is...

    Started by daran‎, 05-23-2009 02:51 AM
    • Replies: 1
    • Views: 1,964
    05-24-2009, 03:05 PM Go to last post
  41. Question repeated measures t-test question - Help!

    Hi, I have measured various parameters (for example heart rate) in two groups (control and treated) over a time course of 45 minutes, taking...

    Started by Nibbler‎, 05-22-2009 04:21 AM
    • Replies: 1
    • Views: 3,414
    05-22-2009, 10:05 AM Go to last post
  42. Question what test to use?

    I have a data set consiting of 50 vegetation plots. I have five possible categories for vegetation cover. Each category can range form 0 to 100% with...

    Started by pajo‎, 05-21-2009 08:49 PM
    • Replies: 2
    • Views: 2,617
    05-22-2009, 09:00 AM Go to last post
  43. Uncertainty

    Hi there, If I take measurements every minute for a whole hour, and I know the uncertainty of a single measurement, is it possible to calculate...

    Started by amarshall17‎, 05-19-2009 08:24 PM
    • Replies: 1
    • Views: 2,704
    05-20-2009, 06:42 PM Go to last post
  44. Sample size...

    have found numerous on-line calculators and have read through some forum postings but am now more confused than ever. I have been asked to...

    Started by mysterymouse‎, 05-19-2009 11:43 PM
    • Replies: 1
    • Views: 3,585
    05-20-2009, 09:13 AM Go to last post
  45. low coefficient alpha

    Hello, I have a question about coefficient alpha. How does having a low alpha effect your statistical tests if you are running say an ANOVA or a...

    Started by psychologygirl‎, 05-19-2009 11:19 AM
    • Replies: 0
    • Views: 4,513
    05-19-2009, 11:19 AM Go to last post
  46. Need help on sampling

    I am very new to statistics so forgive my ignorance...I just need some help to get pointed in the right direction. I need to take some baseline...

    Started by cosmit‎, 05-19-2009 07:34 AM
    • Replies: 0
    • Views: 2,111
    05-19-2009, 07:34 AM Go to last post
  47. grouping doubt

    Hi , I am new to base sas trying to learn on my own , I have a doubt , I have a data set which contains the information about the firms , they...

    Started by singhakshay1710‎, 05-12-2009 09:41 PM
    • Replies: 0
    • Views: 2,084
    05-12-2009, 09:41 PM Go to last post
  48. Can't find a convenient test for this huge dataset :-(

    Hi everyone, I have some trouble choosing the right test for the following study: I have a group of parents and a lot of ordinal measures. I...

    Started by Abdel‎, 05-12-2009 08:55 PM
    • Replies: 0
    • Views: 2,760
    05-12-2009, 08:55 PM Go to last post
  49. Cut-off

    I am reading an article where 5 has been set as a cut-off score. No > or >= symbols are given, and I don't know whether a score of 5 would identify...

    Started by apple‎, 05-12-2009 08:03 AM
    • Replies: 0
    • Views: 2,538
    05-12-2009, 08:03 AM Go to last post
  50. Need a meaningful way to describe heavily-skewed numbers for 50 states

    Hi there, I apologize if this is an insultingly stupid question, but I managed to enroll in a political research class that involved very little...

    Started by dunnsidhe‎, 05-11-2009 04:14 PM
    • Replies: 0
    • Views: 1,597
    05-11-2009, 04:14 PM Go to last post
  51. ANOVA v t-test

    My understanding is that the t-test is a special case of a oneway ANOVA. I am confused by highly discrepant results when comparing the means of 2...

    Started by rob c‎, 05-10-2009 07:00 PM
    • Replies: 2
    • Views: 3,972
    05-10-2009, 09:12 PM Go to last post
  52. Multivariate Gaussian Distributions

    I am interested in understanding Multivariate Gaussian Distributions. I am a (young) Computer Scientist looking to implement the EM algorithm for...

    Started by xnull‎, 05-10-2009 02:42 PM
    • Replies: 0
    • Views: 2,104
    05-10-2009, 02:42 PM Go to last post
  53. gender differences

    Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

    Started by 12345678‎, 04-10-2009 01:08 AM
    • Replies: 6
    • Views: 4,996
    05-09-2009, 07:40 PM Go to last post
  54. Smoothing algorithm for times series and slope measurement

    Hi, I'm doing an experiment that gathers one data point approximately each second. I have plotted all the datapoints on a graph. The graph has...

    Started by nickmath‎, 05-09-2009 08:46 AM
    • Replies: 0
    • Views: 1,964
    05-09-2009, 08:46 AM Go to last post
  55. Question Perception of non-parametric techniques as inferior?

    Hi guys, I've recently worked on a project supervised by a lecturer in the school of psychology at my university. She's been looking over the...

    Started by CowboyBear‎, 05-07-2009 02:55 AM
    • Replies: 3
    • Views: 9,542
    05-08-2009, 06:17 AM Go to last post
  56. which correlation for a PCA?

    I have data that has both discreet and continuous variables and, that are highly variable, not entirely independent of each other and some aren't...

    Started by madhatter‎, 05-08-2009 05:11 AM
    • Replies: 0
    • Views: 3,617
    05-08-2009, 05:11 AM Go to last post
  57. Is there a minimum number of subjects required for a t-test?

    Hi everyone, I am carrying out a piece of research on the effects of heel pain on the way we walk. I have two groups, 8 in the heel pain group...

    Started by philmyfeet‎, 05-06-2009 04:39 PM
    • Replies: 2
    • Views: 18,762
    05-08-2009, 03:43 AM Go to last post
  58. comparing two charts

    Hi, i am new in forum and i am an amateur in Statistics. I have two data sets of the same thing and i want to compare them. For example i have 20...

    Started by stathi02‎, 05-06-2009 11:12 AM
    • Replies: 3
    • Views: 2,816
    05-06-2009, 05:20 PM Go to last post
  59. t-tests or mann-whitney??

    Hello, I have a n=12 sample (and a matched-sample of 12)... I was planning on using t-tests, but now reconsidering it. Would it be correct to use...

    Started by zxcvbnm‎, 03-28-2009 02:16 PM
    • Replies: 2
    • Views: 8,498
    05-03-2009, 06:41 PM Go to last post
  60. logistic regression : intercept is NOT significative

    Hi everybody I have performed a logistic regression with a stepwise selection. But, at the end, the parameter estimate of intercept is NOT...

    Started by babaorumi‎, 02-28-2009 03:21 PM
    • Replies: 5
    • Views: 20,174
    05-03-2009, 07:26 AM Go to last post

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