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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: 18,671
    10-11-2014, 12:02 PM Go to last post
  1. Test statistic concerning mean comparison of UNKOWN sample distributions?

    Hello, all. I'm far from a statistics expert, so excuse me for any inaccuracy that I might say. I'm trying to compare two sample distributions...

    Started by moudatsos‎, 09-29-2008 08:31 AM
    • Replies: 3
    • Views: 6,023
    10-14-2011, 09:03 AM Go to last post
  2. Categorical vs Ordinal data analysis

    I have a question regarding some data analysis I am conducting. I'm trying to find significance and degree/direction of association between two...

    Started by MiltonF‎, 09-14-2010 10:15 PM
    • Replies: 3
    • Views: 10,689
    04-22-2012, 12:41 PM Go to last post
  3. eviews question

    Hello everybody, I need fto find evieuws somewhere on the web but i can't find it. Doesn anyone know where i can download for no charge? Thx for...

    Started by freddysurgery‎, 12-28-2010 01:20 PM
    • Replies: 3
    • Views: 5,562
    09-28-2011, 06:34 AM Go to last post
  4. Poll Poll: do my model considered fit in AMOS?

    Dear all members, I m hereby new members and currently conducting research on organization behavior areas. I need help from all of you. I am very...

    Started by harianto‎, 02-28-2011 02:13 AM
    • Replies: 3
    • Views: 13,269
    08-20-2011, 01:22 AM Go to last post
  5. Two sample tests

    Hello, I am looking for differences in continuous variables between two groups: Healthy people and ill people. I have a sample of around 20 ill...

    Started by WeeG‎, 07-23-2011 07:37 AM
    • Replies: 3
    • Views: 1,846
    07-24-2011, 02:48 PM Go to last post
  6. Group theoretic approach to ANOVA

    Hello, I have been following the works of Diaconis, Viana and van de Ven and have a query about the approach taken in van de Ven's dissertation...

    Started by Ravi Kulkarni‎, 07-27-2011 03:10 AM
    • Replies: 3
    • Views: 1,699
    07-28-2011, 03:05 AM Go to last post
  7. Minimum Sample Size for a Survey

    Hi guys, Here's a question I've been struggling with over the past week. My employer would like to perform a survey to gauge public opinion on a...

    Started by gstab‎, 08-11-2011 01:52 PM
    sample size, survey research design
    • Replies: 3
    • Views: 2,651
    08-11-2011, 02:21 PM Go to last post
  8. Smile DF and fishers vs. pearson's

    Hallo everyone I'm having a mental block today, and having trouble getting my df value. So, here's a summary of my data to help: 32...

    Started by drewmac‎, 08-28-2011 07:38 PM
    binomial, chi, degrees of freedom, fisher, pearson
    • Replies: 3
    • Views: 2,558
    08-29-2011, 12:04 PM Go to last post
  9. Normality Assumption

    Say there is 100 observations, but these observations are equally broken into 2 genders and 5 cities. When creating a qq plot or just checking...

    Started by shanehall.m‎, 08-31-2011 09:00 AM
    assumptions, normality, quality
    • Replies: 3
    • Views: 2,414
    09-01-2011, 01:39 PM Go to last post
  10. Fisher's exact test

    I have always learned that if you have a contingency table that violates the chi square assumption of more than 20% of cells having expected count...

    Started by shanehall.m‎, 08-31-2011 09:46 AM
    categorical data, chi square, exact test, post hoc test
    • Replies: 3
    • Views: 8,880
    09-01-2011, 02:02 PM Go to last post
  11. homogenity of variance

    I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

    Started by fromsydney‎, 09-21-2011 09:08 PM
    • Replies: 3
    • Views: 4,282
    09-22-2011, 02:58 PM Go to last post
  12. Comparing activity budgets, before and after

    Hi all, I am a beginner, so I hope my question is not too stupid. I want to compare activity budgets of animals before and after an event. I...

    Started by Johanna_MonkeyStats‎, 09-08-2011 12:48 PM
    • Replies: 3
    • Views: 3,262
    02-08-2012, 03:05 PM Go to last post
  13. Which data types & correlation method?

    Dear all, I'm a new graduate student and not yet proficient at statistics in research. Please help me confirm/correct the following questions. ...

    Started by nini‎, 09-27-2011 10:13 PM
    correlation method, data type, significance test
    • Replies: 3
    • Views: 12,059
    09-28-2011, 11:17 AM Go to last post
  14. Factorial ANOVA

    I am reading a paper looking at the effect of interventions (an aerobic exercise regime group, a stretching exercise regime group, plus a contol...

    Started by static‎, 10-10-2011 10:46 PM
    • Replies: 3
    • Views: 6,045
    10-12-2011, 02:49 AM Go to last post
  15. Minimum sample size for calculation of guttamns lower bounds?

    Hi there, I am in the process of assessing the internal consistency of two tests, test A & B. Both tests are measuring the same thing so I am...

    Started by BOAZ‎, 10-11-2011 06:31 AM
    conbach's alpha, guttman's lower bounds, internal consistency, reliability, split half
    • Replies: 3
    • Views: 4,598
    10-11-2011, 07:37 PM Go to last post
  16. Discrete distribution with var larger than mean

    Hi, everyone. Is there any statistical distribution (other than binomial) with its variance larger than its mean? Preferably, a distribution which...

    Started by tsukiko‎, 10-29-2011 10:13 PM
    • Replies: 3
    • Views: 7,494
    10-30-2011, 12:41 AM Go to last post
  17. Cool Please help! T-test results & interpretation

    Hi, please help me with this simple question that no one at my uni seems to be able to answer! I have 3 groups (n=20) where I'm looking to...

    Started by Joelle‎, 11-06-2011 07:07 AM
    anova, t-test
    • Replies: 3
    • Views: 3,294
    11-08-2011, 09:11 PM Go to last post
  18. need urgent help

    need help Hi, I have found some difficulty in solving this exercise. HINT: Use the fact that T/σ^2~chi-squared (n-1) and the moments of the...

    Started by JUSTICE‎, 11-11-2011 04:05 AM
    • Replies: 3
    • Views: 1,909
    11-11-2011, 11:47 AM Go to last post
  19. Using a valid researh tool with missing data

    Hi guys, During my M.A thesis i've developed a research tool to measure Urabnic gentrification. The tool is build of 10 items - all of them are...

    Started by Bitbels‎, 11-14-2011 09:22 AM
    • Replies: 3
    • Views: 1,880
    11-14-2011, 11:29 PM Go to last post
  20. NOOB questions about Mancova, Ancova and multiple regression

    I'm a beginning grad student and having a tough time understanding how test results determine if there is reliability and validity. In the study...

    Started by julieo00‎, 12-01-2011 03:34 AM
    • Replies: 3
    • Views: 3,582
    12-02-2011, 09:58 AM Go to last post
  21. Statistical analysis for Rubric Based Research

    There are 26 participants who have participated in my research. Each participant treated with a lab module (Hands on Robotics Session). Now each...

    Started by jnrntr‎, 06-14-2012 11:06 PM
    chi square, hypothesis testing
    • Replies: 3
    • Views: 2,963
    06-17-2012, 08:48 PM Go to last post
  22. statistical methods for detecting the end of event

    could someone help me to propose to me different methods of detecting the end of an event example sequential test of wald have you other methods to...

    Started by sihem‎, 12-12-2011 03:22 PM
    • Replies: 3
    • Views: 1,813
    12-13-2011, 07:51 PM Go to last post
  23. Std. residuals Chi Square test

    Hi all, I am doing some research for a uni project but Im not particularly knowledgeable when it comes to statistics :). Basically, I have two...

    Started by fred_1‎, 12-23-2011 02:28 PM
    • Replies: 3
    • Views: 6,752
    12-24-2011, 03:10 AM Go to last post
  24. Need help on normalizing data

    I have very limited knowledge on statistics, but I need to approach the following question, can any expert here show how to approach it? I have 2...

    Started by danyu‎, 12-15-2011 03:33 PM
    • Replies: 3
    • Views: 5,143
    12-15-2011, 04:17 PM Go to last post
  25. Limiting distribution of score variable

    Prove that \frac{1}{\sqrt{n}}\left (\sum_{i=1}^{n} \frac{\partial l(X_{i};\theta )}{\partial \theta } \right...

    Started by BrownianMan‎, 12-18-2011 02:10 PM
    • Replies: 3
    • Views: 1,611
    12-18-2011, 08:00 PM Go to last post
  26. Interpreting independent t-test result!

    Alright , i had posted a t-test with nonsensical results earlier. There was some installation problem with SPSS and i computed again after installing...

    Started by kathmustdie‎, 12-28-2011 10:27 PM
    • Replies: 3
    • Views: 4,016
    12-29-2011, 11:10 AM Go to last post
  27. Kernel Density Estimation (KDE)

    I feel unsure as to what is the minimum number of genuine (real life) data points needed to applied the procedure and estimate the curve. Any...

    Started by dzericak‎, 01-03-2012 09:42 AM
    • Replies: 3
    • Views: 2,651
    01-03-2012, 07:08 PM Go to last post
  28. Non-normality revisited

    We had a debate on whether normality is required for OLS regression a while back. I ran across this in a book on regression. One of the authors (Ali...

    Started by noetsi‎, 01-11-2012 12:01 PM
    • Replies: 3
    • Views: 1,861
    01-17-2012, 08:46 AM Go to last post
  29. likelihood in two parameters

    Hi guys, i'm new here! I'm an italian student. i would like to begin with a very stupid question :) i'm reading a paper on the likelihood ratio...

    Started by gravity_rainbow‎, 01-18-2012 05:27 PM
    • Replies: 3
    • Views: 1,818
    01-18-2012, 05:44 PM Go to last post
  30. In dire need of help!

    I took Stats 1 3.5 years ago and somehow the college forgot to mention i needed stats 2 to graduate and am now in it. I AM SO LOST and I have a...

    Started by JeremiahC‎, 01-26-2012 09:40 PM
    • Replies: 3
    • Views: 4,885
    01-27-2012, 05:01 AM Go to last post
  31. Statistical testing with very small sample

    Hi all, I have a problem which wasn't covered by any of my econometrics classes. I am going to run an economic experiment. Unfortunately, I just...

    Started by TimoV‎, 01-29-2012 06:26 AM
    • Replies: 3
    • Views: 2,587
    01-30-2012, 03:21 PM Go to last post
  32. Confidence interval and P-value

    Hello Guys thanks for your help in advance I am working on a research paper. I have large set of data (50,000) which allow me to use normal...

    Started by zqkal‎, 02-06-2012 02:32 PM
    • Replies: 3
    • Views: 2,301
    02-08-2012, 11:48 AM Go to last post
  33. Comparing pretest and posttest measures of intervention group with control

    Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

    Started by Jannez‎, 02-14-2012 05:27 AM
    • Replies: 3
    • Views: 4,358
    02-27-2012, 12:05 PM Go to last post
  34. Comparing responses on 5-point scale

    Hi All, I have administered a 5-point scale on my participants which they answered on 10 value items- can I assume this is interval data? I have...

    Started by JB89‎, 04-04-2012 01:32 PM
    • Replies: 3
    • Views: 2,418
    04-05-2012, 03:26 AM Go to last post
  35. How to test this kind statistical hypothesis ?

    Hey. How can I test H_{0} \: : \;\;\; \frac{\mu_{1} + \mu_{3}}{2}=\mu_{2}?

    Started by pajacek‎, 04-15-2012 04:48 AM
    • Replies: 3
    • Views: 1,864
    04-15-2012, 09:59 AM Go to last post
  36. Estimating a pdf from binomial trials - point me in the right direction?

    Hi, I'm afraid I'm not an expert in statistics, but I have a particular problem I'm interested in solving. I'm pretty sure this area already has a...

    Started by Stereotomy‎, 04-23-2012 08:24 PM
    bernoulli, binomial, estimation, inference, parameterless
    • Replies: 3
    • Views: 1,457
    04-27-2012, 12:34 PM Go to last post
  37. Exclamation Problem with allocating data

    Hello, Im currently writing my bachelor thesis in statistical finance and i have run into a small problem. I want to evaluate forcasts from my...

    Started by oswi3605‎, 04-25-2012 05:15 AM
    data, financial, garch, rsoftware, stock
    • Replies: 3
    • Views: 1,849
    05-07-2012, 03:11 AM Go to last post
  38. What is the point of providing p-values for baseline characterisitics?

    I just have a general question about what the point is of have baseline characteristics and then presenting p-values for these. Is the p-value...

    Started by chiccaboom‎, 05-01-2012 11:19 PM
    • Replies: 3
    • Views: 8,262
    05-29-2012, 02:13 PM Go to last post
  39. Boxplot

    Hi All, Can someone please help me to clearly explain this box plot in the attached file ? Thanks in advance

    Started by Sisi‎, 05-07-2012 04:01 AM
    • Replies: 3
    • Views: 1,424
    05-09-2012, 03:33 PM Go to last post
  40. Binary logistic regression with no significant predictors

    Hi everyone, I have a question for logistic regression but i guess it applies to all kinds of regression analysis. I have a model with many...

    Started by micdhack‎, 05-11-2012 06:16 AM
    • Replies: 3
    • Views: 11,110
    05-19-2012, 06:43 AM Go to last post
  41. Chi square test for ordinal variables

    Hey all, I have a question regarding the chi-square statistics. I have a total sample size of more than 4,000 and I have 2 groups (2 different...

    Started by proefkonijn‎, 06-02-2012 01:39 PM
    • Replies: 3
    • Views: 4,000
    06-03-2012, 04:38 AM Go to last post
  42. Red face Appropriate form of ANOVA when blocking

    Hi, I'm new to this forum (and relatively new to statistics) and have a question :) I have a text book that outlines the following experiment: ...

    Started by hrj21‎, 06-06-2012 07:08 AM
    • Replies: 3
    • Views: 1,640
    06-21-2012, 03:51 AM Go to last post
  43. How robust is ANOVA's F-statistic?

    Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

    Started by bimodal‎, 06-29-2012 12:28 PM
    • Replies: 3
    • Views: 3,194
    06-29-2012, 01:48 PM Go to last post
  44. Bayesian Statistics

    Hello I need an example, as simple as possible to Bayesian analysis. I was thinking about a simple proportion problem, perhaps with a credibility...

    Started by NN_STAT‎, 07-09-2012 03:59 AM
    • Replies: 3
    • Views: 2,066
    08-25-2012, 07:14 PM Go to last post
  45. Doubts analyzing Likert scales

    Hi all, I thought about analyzing results from Likert scale using Kruskal-Wallis, but the more I read about it, the more confused I get. People...

    Started by mprksc‎, 07-10-2012 01:41 PM
    • Replies: 3
    • Views: 4,511
    07-12-2012, 09:01 PM Go to last post
  46. Distribution of estimator (exponential distribution; truncated at both ends)

    Good day forum, I've been struggling with for a while and would like to hear some thoughts on this one. I've got an exponential distribution,...

    Started by chippy‎, 07-13-2012 07:42 AM
    • Replies: 3
    • Views: 1,678
    11-05-2012, 01:57 PM Go to last post
  47. breaking data into training and testing (hold-out) sets

    Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare the predictive...

    Started by hollywas‎, 07-21-2012 01:30 PM
    • Replies: 3
    • Views: 2,718
    07-21-2012, 04:47 PM Go to last post
  48. Citation needed for removing 3 Stdev outliers

    Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

    Started by civiloscar‎, 07-30-2012 02:21 PM
    citation, outliers, standard deviation
    • Replies: 3
    • Views: 2,690
    07-30-2012, 04:51 PM Go to last post
  49. Sampling sizes and significance

    Hi all, I got a question hoping someone can help me out. I use this site to calculate my sample sizes http://www.raosoft.com/samplesize.html ...

    Started by skip‎, 08-09-2012 11:00 PM
    • Replies: 3
    • Views: 1,980
    08-10-2012, 08:59 AM Go to last post
  50. Comparison of 20 serum chemistry analytes of reptile blood at time 0 and time 1 hour

    Dear All, I am having troubles in analyzing results of one study: I want to evaluate the effect of time (1 hour) on 20 analytes (e.g. pH, BUN,...

    Started by nicoladiggi‎, 08-30-2012 12:42 PM
    • Replies: 3
    • Views: 1,679
    08-30-2012, 06:09 PM Go to last post
  51. MANOVA vs multiple ANOVAs

    Hello, I have 3 variables that have been measured on 4 occasions and a sample size of 16. I was considering a repeated measures MANOVA to...

    Started by Laf‎, 08-22-2012 05:45 PM
    repeated measures anova, repeated measures manova
    • Replies: 3
    • Views: 2,381
    08-24-2012, 01:41 AM Go to last post
  52. Question Want to be researcher- needs help

    Hello all! I am currently designing my first research project and am confused on what to do after I have my data. I have a basic understanding of...

    Started by musicmancgs‎, 09-05-2012 10:45 AM
    design, research, spss, test
    • Replies: 3
    • Views: 1,952
    09-05-2012, 02:08 PM Go to last post
  53. Smile kappa intra observer error test on ordinal

    hi, sorry if this is all wrong ive never done stats or posted on this forum. im writing my masters dissertation in bioarchaeology and have a...

    Started by elwen_3‎, 09-10-2012 01:04 PM
    • Replies: 3
    • Views: 4,361
    09-11-2012, 12:23 PM Go to last post
  54. Question To combine or not to combine standard deviations?

    Hi, I'm testing the effect of 115 Chinese herbs on bacterial biofilms. I have been carrying out my experiment in microtiter plates and...

    Started by Hemmi‎, 10-11-2012 01:23 AM
    means, standard deviation
    • Replies: 3
    • Views: 1,983
    10-14-2012, 12:15 AM Go to last post
  55. Methods help: How to find significant differences between groups with ordinal data?

    In examining how students performed at the detail level of an assignment, I have received data that is essentially in the form of a checklist....

    Started by hrh2101‎, 10-20-2012 10:39 PM
    • Replies: 3
    • Views: 2,619
    10-26-2012, 11:32 AM Go to last post
  56. Frequency data analysis - repeated measures, between groups

    Hi, I am using SPSS and testing frequency data before and after a treatment, plus follow-up. The variable I am looking at is frequency of symptoms...

    Started by Alice‎, 10-28-2012 08:35 PM
    • Replies: 3
    • Views: 1,474
    11-01-2012, 06:17 PM Go to last post
  57. Survey Design

    Dear All, I would like to design a big survey. The population is around 70 million which is the whole country. The purpose of the design is to ask...

    Started by masarimk‎, 10-18-2012 02:52 AM
    survey design
    • Replies: 3
    • Views: 1,726
    10-22-2012, 01:18 AM Go to last post
  58. How many subsamples from large sample should I draw?

    Hi, I am working on an analysis where I compare 2 different samples, one Dutch and one US sample. The US sample is bigger than the Dutch sample...

    Started by Delforterie‎, 12-11-2012 09:17 AM
    • Replies: 3
    • Views: 1,627
    12-14-2012, 05:24 AM Go to last post
  59. Please help, what analysis to choose?

    Hi, We are doing a customer satisfaction analysis of our school canteen. We have made a factor analysis and made the factor scores. Now we...

    Started by lassekk‎, 11-29-2012 03:06 PM
    • Replies: 3
    • Views: 1,394
    11-29-2012, 03:39 PM Go to last post
  60. Minimum # of ____ in SPORTS

    Hello all, I am working on something that does not actually involve sports but my situation is exactly like something often used in sports...

    Started by lancearmstrong1313‎, 12-17-2012 11:55 AM
    • Replies: 3
    • Views: 2,063
    12-18-2012, 07:59 AM Go to last post

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