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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: 18,682
    10-11-2014, 12:02 PM Go to last post
  1. Two Variables, Many Components :( Type 1 Error?

    Hey, Have spent ages trawling through the threads before I decide I would have to bother everyone with yet another question from a dissertation...

    Started by Elle_Belle‎, 03-28-2009 09:11 AM
    • Replies: 0
    • Views: 2,650
    03-28-2009, 09:11 AM Go to last post
  2. Question Calculating a P-value for a two-tailed One-Standard-Deviation chi-square Test

    How does one calculate a P-value for a two-tailed One-Standard-Deviation chi-square Test? Before we begin, I would like to say thank you for...

    Started by damienpf‎, 04-04-2009 12:32 PM
    • Replies: 0
    • Views: 12,163
    04-04-2009, 12:32 PM Go to last post
  3. Help: relationship between Regime type and war

    Hy guys, i have a question and it's really important. I have to study the relationship between regime type and intrastate war. the dataset from...

    Started by bavarois‎, 04-08-2009 10:21 AM
    • Replies: 0
    • Views: 2,475
    04-08-2009, 10:21 AM Go to last post
  4. Exclamation What kind of sample is this one?

    I am doing some research so I need an information about how to describe this sample: 1. respondents were drawn from internet providers which have...

    Started by lustforknowlg‎, 04-11-2009 08:28 AM
    • Replies: 0
    • Views: 2,292
    04-11-2009, 08:28 AM Go to last post
  5. statistical power of a General Linear Mixed Model with repeated measurements

    Hello, I would like to be able to calculate the statistical power of a General Linear Mixed Model. This model is applied on longitudinal data on...

    Started by alstublieft‎, 04-15-2009 07:37 AM
    • Replies: 0
    • Views: 3,753
    04-15-2009, 07:37 AM Go to last post
  6. Meta-analyses

    Hi following you, is there a minimum of paper / study / publication to write a meta-analyse ??? Do you know something to evaluate a meta-analyse...

    Started by viwel‎, 04-21-2009 09:15 AM
    • Replies: 0
    • Views: 2,095
    04-21-2009, 09:15 AM Go to last post
  7. Sampling Method? Too many schools to sample

    I am part of a research team looking at the outcomes of a homework help program and would like to make a few suggestions of how to generate data. ...

    Started by Zooi‎, 04-24-2009 11:07 AM
    • Replies: 0
    • Views: 2,182
    04-24-2009, 11:07 AM Go to last post
  8. Is the 2-independent group T test ok?

    I would like a suggestion on what analysis to run for my data, and whether a 2-independent sample T test is ok to do because my dependent variable is...

    Started by needinghelp‎, 04-25-2009 03:40 PM
    • Replies: 0
    • Views: 2,581
    04-25-2009, 03:40 PM Go to last post
  9. What statistic to use?

    I am reviewing the statistics we currently use at work to ensure that we are using the correct statistics. The scenario is: a. We produce...

    Started by elisayoung‎, 04-27-2009 07:19 PM
    • Replies: 1
    • Views: 3,417
    04-28-2009, 01:13 AM Go to last post
  10. Lightbulb Obtaining Residuals in Chi Square Goodness of Fit

    Another question re: goodness of fit testing, Is the procedure for obtaining standardized residuals the same ? The PhD student who leads the...

    Started by Fred‎, 04-27-2009 11:13 AM
    • Replies: 4
    • Views: 4,548
    04-28-2009, 11:01 AM Go to last post
  11. Current Commentary Study

    Hi what is it a Current commentary study ??? What does it mean ??? Regards

    Started by viwel‎, 04-28-2009 07:05 AM
    • Replies: 2
    • Views: 2,877
    04-30-2009, 07:52 AM Go to last post
  12. OLS assumptions after estimating robust standard errors

    Hello everybody, To counter problems with outliers and heteroscedasticity, I have computed an OLS with robust standard errors (using the "robust"...

    Started by andony‎, 04-29-2009 10:54 AM
    • Replies: 1
    • Views: 3,218
    05-01-2009, 12:43 AM Go to last post
  13. 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: 20,213
    05-03-2009, 07:26 AM Go to last post
  14. 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: 8,533
    05-03-2009, 06:41 PM Go to last post
  15. 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: 2,828
    05-06-2009, 05:20 PM Go to last post
  16. 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: 18,811
    05-08-2009, 03:43 AM Go to last post
  17. 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: 3,633
    05-08-2009, 05:11 AM Go to last post
  18. 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: 9,554
    05-08-2009, 06:17 AM Go to last post
  19. 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: 1,968
    05-09-2009, 08:46 AM Go to last post
  20. 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: 5,008
    05-09-2009, 07:40 PM Go to last post
  21. 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: 2,106
    05-10-2009, 02:42 PM Go to last post
  22. 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: 4,000
    05-10-2009, 09:12 PM Go to last post
  23. 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: 1,602
    05-11-2009, 04:14 PM Go to last post
  24. 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: 2,540
    05-12-2009, 08:03 AM Go to last post
  25. 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: 2,770
    05-12-2009, 08:55 PM Go to last post
  26. 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: 2,091
    05-12-2009, 09:41 PM Go to last post
  27. 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: 2,113
    05-19-2009, 07:34 AM Go to last post
  28. 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: 4,538
    05-19-2009, 11:19 AM Go to last post
  29. 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: 3,599
    05-20-2009, 09:13 AM Go to last post
  30. 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: 2,707
    05-20-2009, 06:42 PM Go to last post
  31. 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: 2,632
    05-22-2009, 09:00 AM Go to last post
  32. 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: 3,418
    05-22-2009, 10:05 AM Go to last post
  33. 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: 1,968
    05-24-2009, 03:05 PM Go to last post
  34. 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: 2,367
    05-27-2009, 08:45 AM Go to last post
  35. 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: 5,149
    05-27-2009, 04:34 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: 3,091
    05-27-2009, 08:39 PM Go to last post
  37. 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: 1,996
    05-30-2009, 09:33 PM Go to last post
  38. 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: 1,921
    06-02-2009, 01:02 PM Go to last post
  39. 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: 2,469
    06-05-2009, 04:38 AM Go to last post
  40. 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: 5,761
    06-05-2009, 12:15 PM Go to last post
  41. 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: 29,436
    06-15-2009, 08:05 PM Go to last post
  42. 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: 2,537
    06-15-2009, 08:07 PM Go to last post
  43. 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: 2,950
    06-16-2009, 04:57 AM Go to last post
  44. 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: 4,147
    06-17-2009, 04:18 PM Go to last post
  45. 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: 2,278
    06-17-2009, 10:15 PM Go to last post
  46. 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: 7,102
    06-19-2009, 03:17 AM Go to last post
  47. 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: 3,565
    06-22-2009, 10:41 AM Go to last post
  48. (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: 7,192
    06-22-2009, 07:50 PM Go to last post
  49. 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: 4,335
    06-23-2009, 12:01 AM Go to last post
  50. 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: 2,795
    06-23-2009, 07:12 PM Go to last post
  51. 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: 2,978
    06-24-2009, 01:24 AM Go to last post
  52. 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: 8,134
    06-24-2009, 02:32 PM Go to last post
  53. 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: 4,700
    07-06-2009, 02:46 PM Go to last post
  54. 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: 1,894
    07-13-2009, 05:21 AM Go to last post
  55. 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: 2,304
    07-13-2009, 12:20 PM Go to last post
  56. 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: 2,811
    07-13-2009, 07:20 PM Go to last post
  57. 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: 25,704
    07-14-2009, 06:33 AM Go to last post
  58. 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: 3,774
    07-15-2009, 01:01 AM Go to last post
  59. 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: 3,879
    07-17-2009, 02:40 PM Go to last post
  60. 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: 3,512
    07-19-2009, 09:33 PM Go to last post

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