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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: 18,756
    10-11-2014, 12:02 PM Go to last post
  1. cramers v and level of significance interpretation

    Hey guys :) I have been searching for hours in books, forums and on the internet but I can't find answers to my questions, so you are my last...

    Started by Anschi7591‎, 08-24-2013 11:00 AM
    • Replies: 1
    • Views: 5,524
    08-25-2013, 01:12 AM Go to last post
  2. how to determine the sample size needed for logit model

    how to determine the sample size needed for logit model? we are currently working on a thesis.

    Started by Anthny Garc‎, 08-02-2011 01:46 AM
    • Replies: 1
    • Views: 3,461
    08-03-2011, 12:12 AM Go to last post
  3. Event study on index

    Dear all, I'm conducting several event studies for my thesis. But I'm wondering if it's possible to conduct one on an index. I want to see if the...

    Started by anthonyphilippe‎, 08-01-2013 03:30 AM
    • Replies: 1
    • Views: 1,059
    08-01-2013, 03:43 AM Go to last post
  4. Question Help With The Preffered Package Type Assessment

    Hello there to everyone! I have the question concerning the underlying data analysis methodology. Here is the small introduction. There is a data...

    Started by antivanov‎, 11-12-2012 05:11 PM
    cluster analysis, data analysis, methodology, regession
    • Replies: 2
    • Views: 1,392
    11-15-2012, 12:45 PM Go to last post
  5. Estimation of suitable significance level for high numbers of experiments

    I am a scientist and work with high numbers of experiments. For example: I have tested 1000 different parameters between 2 groups. I found 10...

    Started by AntonS1988‎, 06-13-2016 11:37 AM
    binomial, experiment, false positive, high numbers, significance level
    • Replies: 0
    • Views: 1,054
    06-13-2016, 11:37 AM Go to last post
  6. Lightbulb can not figure out simple question, please help

    hi everyone! I have the following question: while running univariate GLM, I have encountered the situation when mean differences between groups...

    Started by Antouanetta‎, 07-04-2013 10:36 AM
    glm, pairwise comparison, significance, spss output, univariate
    • Replies: 1
    • Views: 995
    07-08-2013, 03:22 AM Go to last post
  7. Raw Data vs Frequency Distribution

    Hi, I am new here, please discuss this given below. Why an average computed from a frequency distribution is not exactly the same as...

    Started by Anum‎, 05-09-2015 07:44 AM
    • Replies: 6
    • Views: 5,921
    05-11-2015, 07:48 AM Go to last post
  8. 4 simultaneous non-independent measures should nested ANOVA work?

    Hi all, this is my first time posting here, but Im very stuck. I have to analyze data from an animal behavior experiment. I have 3 strains, with 20...

    Started by anvee‎, 08-14-2014 02:35 PM
    animal behavior, behavioral experiment, jmp, nested anova, preference
    • Replies: 0
    • Views: 2,680
    08-14-2014, 02:35 PM Go to last post
  9. grouing variable,likertscale firm,performance,multvariate analysis

    My research is aim to investigate the mechanisms through which IT influence sustainability of competitive advantage. The data is collected through...

    Started by Anwar Shamamseldinn‎, 12-11-2011 05:45 PM
    • Replies: 0
    • Views: 1,305
    12-11-2011, 05:45 PM Go to last post
  10. 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: 26,373
    08-18-2009, 12:00 AM Go to last post
  11. Please help with my statistical query

    So I am comparing 2 imaging techniques and correlating their results for calculating bone mineral density in the knees. One is called DEXA which is a...

    Started by apoorvprasad‎, 04-17-2013 06:55 AM
    • Replies: 2
    • Views: 1,206
    04-17-2013, 05:13 PM Go to last post
  12. 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: 2,550
    05-12-2009, 08:03 AM Go to last post
  13. On what statistical significance test should I use

    Hi everyone, First and foremost, my skills in statistics are quite basic so what I am about to ask may sound very stupid. That being said, here...

    Started by Applepip‎, 08-22-2011 06:22 PM
    • Replies: 7
    • Views: 2,265
    08-24-2011, 01:33 PM Go to last post
  14. AOV-How worried do I need to be about non-normal and unequal residuals

    I am working on a 3 by 8 factorial design with limited replication (5). I was handed this data set by someone who left my department and want to see...

    Started by arborkoeser‎, 11-02-2011 12:59 AM
    • Replies: 0
    • Views: 2,245
    11-02-2011, 12:59 AM Go to last post
  15. Goodness of Fit Applicability

    I'm Looking for some advice on comparing the results of two different sampling methods (sampling the same population) against each other. The two...

    Started by Archoplites‎, 02-13-2013 02:49 PM
    • Replies: 2
    • Views: 1,232
    02-13-2013, 05:09 PM Go to last post
  16. GARCH fitting to binary data / latent data

    Dear all I am trying to fit a simple ARCH(1)/GARCH(1,1) model to a set of binary data, i.e. I assume a latent GARCH process that is only observed...

    Started by ARDE‎, 05-30-2012 03:19 AM
    • Replies: 0
    • Views: 2,026
    05-30-2012, 03:19 AM Go to last post
  17. Gamma Poisson Mixture with finite Gamma

    Dear all I am working with a Gamma-Poisson mixture distribution where (and this is not usual) the support of the Gamma distribution (in fact, I am...

    Started by ARDE‎, 11-30-2012 06:49 AM
    gamma, mixture, poisson
    • Replies: 0
    • Views: 1,677
    11-30-2012, 06:49 AM Go to last post
  18. Nonparametric statistical significance test for largely skewed count data

    My research design looks as follows: an experimental game with 4 participants (human subjects), repeated for 20 rounds. During each round,...

    Started by ardelia‎, 07-04-2014 06:12 AM
    • Replies: 3
    • Views: 1,116
    07-04-2014, 08:03 AM Go to last post
  19. Low population hypothesis testing

    Hi, I'm doing statistics for a friend of mine. Problem with the data is that there are only 64 responses. Questionnaire was distributed to a...

    Started by aretai‎, 11-10-2010 07:45 AM
    • Replies: 4
    • Views: 3,549
    11-16-2010, 06:28 AM Go to last post
  20. Subspace clustering

    Hello, Could you recommed me book about subspace clustering?

    Started by Aretse‎, 03-12-2014 04:42 AM
    cluster analysis, data minig
    • Replies: 0
    • Views: 1,082
    03-12-2014, 04:42 AM Go to last post
  21. Need Help on Method Analysis

    Hi, i am currently doing a research for my project and it requires me to use statistical analysis to validate the data. I am not sure on which method...

    Started by arezeem‎, 06-01-2016 11:03 PM
    • Replies: 0
    • Views: 1,698
    06-01-2016, 11:03 PM Go to last post
  22. Moral Dilemma Scenarios - How to measure different options?

    In a survey sent to business school students I want to measure predictors of ethical behavioral intentions. I have several latent independent...

    Started by Argenfels‎, 08-31-2014 10:10 AM
    • Replies: 0
    • Views: 1,453
    08-31-2014, 10:10 AM Go to last post
  23. Friedman test...

    I really hope someone can help as I am a bit lost and my knowdledge in statistics is very basic. I have done an experiment in which I have...

    Started by ARI‎, 10-18-2011 10:12 AM
    • Replies: 0
    • Views: 1,546
    10-18-2011, 10:12 AM Go to last post
  24. Need help on SEM analysis using AMOS

    After defining my model when I run the analysis, it gives me a message that "The specified model is probably unidentified. In order to achieve...

    Started by arindam‎, 06-04-2012 05:13 AM
    • Replies: 1
    • Views: 13,429
    06-04-2012, 12:31 PM Go to last post
  25. Which statistical analysis technique to use in my research

    Hi Everyone, My research contains the following 1. Multiple independent input variables. 2. One dependent variable. 3. All the variables are...

    Started by arjuna‎, 04-12-2013 09:00 AM
    • Replies: 0
    • Views: 1,047
    04-12-2013, 09:00 AM Go to last post
  26. Appropriate Statistical Analysis

    Hello, I am getting ready to take comprehensive exams for my Master's Degree and have not had statistics in four years. I need some assistance in...

    Started by arkcomputers‎, 03-03-2009 01:47 PM
    • Replies: 4
    • Views: 4,038
    03-04-2009, 12:39 AM Go to last post
  27. correlation method for latent variable

    Hi! I have several dichtomous variable which are latent and normally distributed. When I calculate correlation with two of these variables I ought...

    Started by arkiaamu‎, 02-05-2014 03:10 AM
    • Replies: 0
    • Views: 832
    02-05-2014, 03:10 AM Go to last post
  28. Correlation of two dependent variables

    Hi all! I have a small data set which contains two tissue samples from ~20 patients. Each patient has contributed a tissue sample from left and...

    Started by arkiaamu‎, 05-09-2014 01:26 AM
    • Replies: 0
    • Views: 2,219
    05-09-2014, 01:26 AM Go to last post
  29. Wilk s theorem and LR test

    Hello, I have first posted the following in the "Statistics help" section, but it might be that it is better to post it here. I have some...

    Started by Arkonis‎, 03-22-2012 11:19 AM
    • Replies: 2
    • Views: 3,659
    03-30-2012, 09:56 AM Go to last post
  30. too large p-value

    Hi, I have a problem of interpretation of some results. The problem is the following: I have a model with 4 parameters I have N=55 data...

    Started by Arkonis‎, 11-29-2012 06:18 PM
    • Replies: 1
    • Views: 2,568
    12-01-2012, 07:57 AM Go to last post
  31. A bit rusty could someone give me a shove in the right Direction Please

    Hi guys , I'm a management PhD student. I did a module on SPSS 14 before having to take a year out. I'm now starting to write up a bit of my thesis...

    Started by arobbo‎, 08-25-2008 07:48 AM
    • Replies: 1
    • Views: 2,779
    08-25-2008, 11:05 AM Go to last post
  32. Mann-Whitney U Test for non random sample

    Hi I've got too groups Success and Failure I've got four sample populations in different industries that i've ranked by a measure of success. ...

    Started by arobbo‎, 01-19-2011 01:10 PM
    • Replies: 2
    • Views: 3,415
    01-20-2011, 03:31 AM Go to last post
  33. problem with calculating total score on SPSS

    Hi everyone, I am having a problem with calculating total scores for my measuring instruments on SPSS. If a case has a missing value on one item...

    Started by Arooba‎, 04-21-2015 04:49 AM
    • Replies: 1
    • Views: 1,998
    04-21-2015, 08:16 AM Go to last post
  34. Three parameter Weibull confidence intervals

    I am using the Weibull distribution for reliability, mainly related to material fatigue. For the two-parameter fitting, there are methods for...

    Started by arturo_20‎, 07-03-2015 09:45 AM
    • Replies: 0
    • Views: 1,314
    07-03-2015, 09:45 AM Go to last post
  35. Convergence in LLN and CLT help!

    Hi there, I am trying to figure out how convergence in law of large number and central limit theorem is affected by correlation in the random...

    Started by artzahar‎, 03-06-2015 04:29 AM
    central limit theore, law of large number, statistics
    • Replies: 1
    • Views: 1,259
    03-06-2015, 08:34 AM Go to last post
  36. Derivation of OLS residuals and asymptotic properties

    Hello, Im stuck with this questions. Its asking for the derivation of asymptotic properties of 1/n*(sum of ehat^3) where ehat is the residual of...

    Started by artzahar‎, 03-11-2015 07:45 PM
    • Replies: 0
    • Views: 1,014
    03-11-2015, 07:45 PM Go to last post
  37. Estimating parameters using a different method?

    Hi, I have a probability distribution which has two parameters \alpha and \beta I re-parametrized the distribution such that the new...

    Started by arun‎, 08-16-2012 02:01 AM
    • Replies: 2
    • Views: 1,115
    08-16-2012, 08:43 AM Go to last post
  38. Need a binary data with high intraclass correlation.

    Hi! for my research, in order to compare some new correlated binomial models, I need an empirical data where the binomial binary trials are highly...

    Started by arun‎, 08-20-2012 01:49 PM
    • Replies: 0
    • Views: 1,274
    08-20-2012, 01:49 PM Go to last post
  39. Comparing overdispersion distributions

    I am dealing with handling overdispersed count data(Poisson distributions fails to fit). I need to compare three different mixtures of Poisson...

    Started by arun‎, 09-14-2012 08:28 AM
    • Replies: 0
    • Views: 1,442
    09-14-2012, 08:28 AM Go to last post
  40. Generating Beta binomial random variables

    Hi, I am looking for the theoretical method/algorithms to generate beta-binomial random variables. I would like to kindly request you to suggest...

    Started by arun‎, 11-19-2012 10:17 AM
    beta binomial, generation
    • Replies: 0
    • Views: 1,197
    11-19-2012, 10:17 AM Go to last post
  41. Alternative to Pearson's Chi-Square Goodness of fit test, when expected counts < 5

    Hi there, In a part of my research, I am fitting probability distribution models for the count data(and binomial data) using Poisson, Binomial,...

    Started by arun‎, 03-29-2013 01:55 AM
    • Replies: 2
    • Views: 1,554
    04-21-2013, 08:08 AM Go to last post
  42. Is it possible to Reduce/Correct Bias through EM algorithm?

    I am dealing with few overdispersed count models and using mixed Poisson distributions to deal with overdispsered data. I've used MLE technique to...

    Started by arun‎, 04-05-2013 09:00 AM
    bias, estimation, expectation-maximization
    • Replies: 0
    • Views: 1,176
    04-05-2013, 09:00 AM Go to last post
  43. Experimental design: ANOVA? help!

    Hello, I have to analyze one paramater (lipid content) of seeds from 5 different cultivars. I am planning to do two independent analysis of the...

    Started by Arwen82‎, 02-26-2017 02:18 PM
    • Replies: 3
    • Views: 1,565
    03-05-2017, 09:09 AM Go to last post
  44. Okay to Sum Numerical Values of Categorical Variables?

    Hi. I have questions regarding categorical variables. Can you create a scaled variable out of several dichotomous variables? For example if I...

    Started by Aryianna‎, 01-08-2015 12:17 AM
    analysis, categorical, dichotomous, statistics
    • Replies: 0
    • Views: 1,347
    01-08-2015, 12:17 AM Go to last post
  45. Relative Risk calculation

    Hi bit of help would be much appreciated for what is probably a bit of a silly question. I am trying to calculate relative risks of an adverse...

    Started by asaleh‎, 09-29-2014 06:27 AM
    • Replies: 6
    • Views: 2,739
    10-06-2014, 04:41 PM Go to last post
  46. 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: 2,537
    10-08-2010, 04:39 AM Go to last post
  47. Checking conditional and mutual independence

    Hi, I am working on bayesian networks and i am encountering problem in calculation of conditional and mutual independence. My problem is I have...

    Started by Aseem‎, 06-04-2010 05:58 AM
    • Replies: 0
    • Views: 1,998
    06-04-2010, 05:58 AM Go to last post
  48. Calculating weighted mean & SD from multiple group data

    I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

    Started by asf‎, 11-19-2012 08:50 PM
    • Replies: 2
    • Views: 4,775
    11-21-2012, 07:47 PM Go to last post
  49. Multivariate Normality accepted at 5% significance level but rejected at 1% ??

    Hi, I am new to this forum. I am trying to test whether a set of variables in the data follow multivariate normal distribution. I found Mardia's...

    Started by ashutosh‎, 03-27-2013 02:15 PM
    multivariate normal, null hypothesis, p value, significance level
    • Replies: 1
    • Views: 2,860
    03-27-2013, 02:30 PM Go to last post
  50. Nonparametric methods

    If I have a sample with the size of the right and left arms of each of these people.So I have two dependent groups, since these are the same person,...

    Started by askazy‎, 12-12-2014 01:28 PM
    • Replies: 10
    • Views: 2,510
    12-16-2014, 06:30 AM Go to last post
  51. Why does n and N values change when weighing by percent?

    I am weighting my survey during data analysis to equalize two groups within one variable. In order to get these two groups equal I weight one value...

    Started by asmith77559‎, 08-15-2012 02:43 PM
    • Replies: 0
    • Views: 1,337
    08-15-2012, 02:43 PM Go to last post
  52. test whether 2 mean scores are significantly different

    I have two groups of participants; 1 group received treatment A and the other group received treatment B. I have the mean scores of the effectiveness...

    Started by Astero‎, 06-22-2011 09:28 AM
    psychology, spss, statistical test, statistics, statistics help
    • Replies: 9
    • Views: 9,937
    06-22-2011, 03:09 PM Go to last post
  53. Forest Plots - Please Help!!!!!

    How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

    Started by Astero‎, 06-22-2011 12:44 PM
    forest plots, statistics, statistics help
    • Replies: 3
    • Views: 8,820
    06-22-2011, 05:55 PM Go to last post
  54. 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
  55. Help w/survey results!

    I am hoping someone can help me figure out how to do the following: I am a member of my child's school's accountability committee, and as such we...

    Started by astro_girl‎, 04-07-2011 07:18 PM
    • Replies: 4
    • Views: 3,535
    04-08-2011, 04:05 PM Go to last post
  56. Post hoc test

    I want to run a post hoc test along with my MANOVA, but I don't know which post hoc test to run. I am looking at the difference in prey preference...

    Started by astuczka‎, 03-24-2010 07:32 PM
    • Replies: 1
    • Views: 3,032
    03-25-2010, 04:24 AM Go to last post
  57. Plot Characterization

    Hi all, I am plotting voltage errors (Y) vs positions (X) X values are always sequential and ordered ascending I am concerned primarily with...

    Started by asuwish4‎, 09-08-2014 10:22 AM
    analysis, characterization, linearity, plot
    • Replies: 0
    • Views: 1,431
    09-08-2014, 10:22 AM Go to last post
  58. Interactions in R and posthocs (lmer model)

    Hello there, here's a question about interactions. Let's just say you have the variables Diagnosis with two levels LI (language impaired) and N...

    Started by at474‎, 10-20-2009 02:18 PM
    • Replies: 1
    • Views: 6,243
    10-20-2009, 10:51 PM Go to last post
  59. Why does a model with an interaction has to include the interaction main effects?

    :wave: Hello fellow stats talkers, If we are only interested in an interaction, I was wondering why a model with a significant interaction also has...

    Started by at474‎, 10-22-2009 11:48 PM
    • Replies: 1
    • Views: 6,248
    11-11-2009, 08:52 AM Go to last post
  60. By-item random intercepts--to include or not to include?

    We're hoping someone can shed light on this one... :) In experiments involving human subjects, samples are taken from the population. The same can...

    Started by at474‎, 11-10-2009 10:14 AM
    • Replies: 1
    • Views: 2,928
    01-01-2010, 02:46 PM Go to last post

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