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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: 18,785
    10-11-2014, 12:02 PM Go to last post
  1. 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: 2,936
    01-01-2010, 02:46 PM Go to last post
  2. What specific type of GLM to use?

    I'm trying to figure out what type of distribution (Poisson or binomial) to use to measure differences in proportions using logistic glm. Basically I...

    Started by atamalu‎, 03-12-2017 06:25 PM
    • Replies: 2
    • Views: 1,392
    03-13-2017, 04:52 PM Go to last post
  3. Which test to use please?

    Hello, I am relatively new to Stats and am have troubles deciding which test to use. I am testing the risky shift phenomenon. Participants were...

    Started by AthenaAnkou‎, 03-19-2013 08:35 AM
    • Replies: 2
    • Views: 2,916
    03-19-2013, 12:48 PM Go to last post
  4. Statistical justification for Cochrans Q please

    Please may someone tell me the proper way to write a statistical justification for a Cochrans Q .. By any chance is it the same a t-test? ...

    Started by AthenaAnkou‎, 12-29-2013 12:50 PM
    • Replies: 4
    • Views: 1,451
    12-29-2013, 06:57 PM Go to last post
  5. Wilcoxon (SL) Regression - Confidence Intervals on Parameter Estimators?

    Does anyone know of a method to create confidence intervals on the SLR parameter estimates of a Wilcoxon Regression model?

    Started by Athenaeum‎, 05-24-2017 09:28 PM
    confidence, interval, regression, wilcoxon
    • Replies: 1
    • Views: 747
    05-24-2017, 09:47 PM Go to last post
  6. Question VAR model definition

    Edit: Question Answered. Instead, could you please tell me how can I delete a topic once I post it, if that's possible. Cheers Greetings, I have...

    Started by Athinagoras‎, 04-18-2014 09:56 AM
    autoregressive, var, vector
    • Replies: 0
    • Views: 1,229
    04-18-2014, 09:56 AM Go to last post
  7. Comparison of two treatments (paired and unpaired)

    Hi all! I'm working on my Master thesis and need to make sure I'm not doing it wrong. My research: Are answers to questions a and b...

    Started by atisketatasket‎, 07-19-2014 03:02 AM
    comparison, distribution, sample, survey, treatments
    • Replies: 0
    • Views: 1,089
    07-19-2014, 03:02 AM Go to last post
  8. S-shapec urve goodness of fit

    hi, I'm looking for a statistical test to prove (statistically) that the cumulative curve is S-shape When I try to look for answer I get 2...

    Started by atlasm‎, 12-07-2016 01:44 AM
    data, s-shape, test of significance
    • Replies: 0
    • Views: 2,702
    12-07-2016, 01:44 AM Go to last post
  9. Comparing 3D points/surfaces statistically.

    Hello. I'm performing two-at-a-time analysis on simulation data, plotting the output metric (Z axis) for each combination of two parameters (X,Y...

    Started by atreide‎, 08-18-2013 02:31 PM
    • Replies: 3
    • Views: 2,376
    08-20-2013, 04:56 AM Go to last post
  10. relating continuous data to discrete data.

    Im not a statistician, but a mathematician assigned to solve problems of engineering applications. However, recently Ive come across some problems...

    Started by August‎, 09-12-2012 12:23 PM
    • Replies: 0
    • Views: 1,667
    09-12-2012, 12:23 PM Go to last post
  11. Post hoc analysis: how to determine if sample size was sufficient and level of power

    Having difficulty downloading statistical sample/power calculators and have no allocated stats help. Need to find out the following: 1. ...

    Started by Aussnorway‎, 10-26-2012 05:06 AM
    • Replies: 0
    • Views: 1,806
    10-26-2012, 05:06 AM Go to last post
  12. Estimating likelihood of normal distribution mean shift after N samples

    First off, sorry if this post is in the wrong place. Please feel free to point me to the right place to post. The scenario is as follows: I have...

    Started by aut0pilot101‎, 06-11-2013 10:12 PM
    • Replies: 6
    • Views: 2,470
    06-12-2013, 10:39 AM Go to last post
  13. True mean and the Central Limit Theorem

    I've learned some pretty remarkable things about the Central Limit Theorem and the so-called Sampling Distribution of the Sample Mean. But there's...

    Started by aut0pilot101‎, 06-15-2013 03:56 PM
    • Replies: 3
    • Views: 1,324
    06-15-2013, 04:21 PM Go to last post
  14. Two-step PPS stratified sample: how to choose additional respondents?

    Hello, I find nothing in the literature on how to deal with this, so here goes. We have a relatively complex sample, and we need to acquire...

    Started by autarkie‎, 03-11-2011 03:46 AM
    • Replies: 0
    • Views: 4,329
    03-11-2011, 03:46 AM Go to last post
  15. Help!SEM fitting index all failed,tho reliability and validity test passed.Reason?!

    Dear all brilliant members, I am a new analyzing thesis data. Im conducting a survey about people's behavior intention, but i came into a serious...

    Started by autumnwu‎, 08-17-2011 07:17 AM
    • Replies: 0
    • Views: 1,610
    08-17-2011, 07:17 AM Go to last post
  16. Lightbulb Help about kappa coefficient?

    Is it acceptable using kappa coefficient for examining intra-rater agreement? or which statistical measurement do you prefer to use for...

    Started by avatar_avatar‎, 05-05-2013 05:02 PM
    • Replies: 0
    • Views: 940
    05-05-2013, 05:02 PM Go to last post
  17. Trying to compose a single probability value from sampling an "online" source

    Hi, First at all, the presentations: I have recently found this forum surfing the web, and it seems very very interesting and helpfully for an...

    Started by aviloria‎, 10-23-2012 02:18 PM
    • Replies: 1
    • Views: 1,282
    10-24-2012, 06:33 AM Go to last post
  18. Bayesian inference, MAP and sampling (Gibbs)

    Hi all I'm applying bayes inference to a GMM, based on some data set. I'm using Gibbs sampling to get the "samples" from the posteriors (the mean's...

    Started by avima‎, 04-12-2011 11:53 AM
    • Replies: 6
    • Views: 4,960
    04-17-2011, 09:30 PM Go to last post
  19. Red face Cramer's V

    Hi all, Just have a question about Cramer's V. I'm doing some analysis on education levels of partners; male partners vs. female partners. In the...

    Started by AvMac‎, 05-20-2015 08:58 PM
    cramer's v
    • Replies: 2
    • Views: 1,542
    05-21-2015, 09:05 PM Go to last post
  20. Incorporating correlation between parameters using variation-covariance matrix

    Hi all, My colleagues and I are working on a project (i.e., health economics model) where we have fitted parametric curves (using Weibull,...

    Started by awchua‎, 07-07-2014 03:40 PM
    correlation, kaplan-meier, parametric curve fit, survival, variation-covariance
    • Replies: 0
    • Views: 1,335
    07-07-2014, 03:40 PM Go to last post
  21. Lightbulb What type of analysis??

    The purpose of my experiment was to study how ultraviolet radiation effects the quality of eggs. My explanatory variables are: 1) The distance at...

    Started by ayo jay jo‎, 03-29-2011 10:53 AM
    • Replies: 1
    • Views: 2,081
    03-29-2011, 07:11 PM Go to last post
  22. statistical significance and number of experiments required

    Hi all I have a n*3 matrix. I add guassian noise with mean 0 and SD 1 to this matrix ... My hypothesis is that this noise does not change a...

    Started by azar373‎, 07-14-2011 11:43 AM
    • Replies: 3
    • Views: 2,321
    07-14-2011, 01:04 PM Go to last post
  23. Meta-analysis for Pre vs Post (Which SD to use)

    Hello everyone, I have extracted data from longitudinal studies that have collected data on pre and post time points. All studies have same time...

    Started by azizfar‎, 10-16-2017 12:54 AM
    estimating sd, meta-analysis, pre vs post, sd pooled
    • Replies: 3
    • Views: 184
    10-16-2017, 07:58 AM Go to last post
  24. Statistics of Rating

    In a website, albums are ranked based on users' input. Each user selects some albums to rate, giving each album a whole number between 1 and 10. I...

    Started by azsantosk‎, 10-02-2013 08:59 AM
    rankings, ratings
    • Replies: 0
    • Views: 1,408
    10-02-2013, 08:59 AM Go to last post
  25. reverse causality and endogeneity problems

    Hi all, I am trying to analyse the effect of the sex of a CEO (female vs male) on a performance measure of two types of firms (Conglomerate and...

    Started by a_dabch‎, 03-15-2017 04:25 PM
    • Replies: 1
    • Views: 1,442
    03-23-2017, 12:55 PM Go to last post
  26. Cool Is AR(1)-ARCH(1) covariance stationary?

    I'm becoming confused by this. Say I have the following model: I know that an AR(1) is covariance stationary if |\phi|<1. I also know...

    Started by A_Jo‎, 11-13-2015 10:11 PM
    arch, arma, covariance, stationary, time series
    • Replies: 1
    • Views: 1,918
    11-14-2015, 07:29 PM Go to last post
  27. Likert scale - questionnaire administered twice - longitudinal study

    Hi, I am running a longitudinal study which lasted for few months during which all participants used a specific communicaiton device. I conducted...

    Started by A_n_y_a‎, 04-21-2011 03:18 PM
    administered twice, likert scale, longitudinal study, questionnaire
    • Replies: 1
    • Views: 3,045
    04-22-2011, 06:34 PM Go to last post
  28. Is there any effect if i change the column value in Minitab Taguchi DOE design??

    Hello all, I am trying to design Design of Experiment using Minitab statistical software using Taguchi approach. I have 3 level and four factors....

    Started by b.borad‎, 08-30-2013 11:57 AM
    minitab, taguchi
    • Replies: 0
    • Views: 930
    08-30-2013, 11:57 AM Go to last post
  29. Hypothesis Testing question. Is it Null or Alternative? More details.

    Hello. I'm new here and its going to be my first thread(excluding my introduction thread). I hope I'm posting this thread on the right section. ...

    Started by b8erxwt‎, 10-01-2011 12:57 PM
    • Replies: 1
    • Views: 3,062
    10-03-2011, 04:39 PM Go to last post
  30. 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: 20,324
    05-03-2009, 07:26 AM Go to last post
  31. question about 3 variables

    Good evening good people, I hope to get some help and good advice from you. The problem is follow: 1. I have one big questionnaire with...

    Started by badibad‎, 02-25-2013 02:18 PM
    • Replies: 0
    • Views: 1,676
    02-25-2013, 02:18 PM Go to last post
  32. Post Am I applying this Chi-squared test correctly?

    Hi everyone! I am a history grad student and I am trying to use some statistics in one of my papers. I am working with a certain (ancient) text...

    Started by badslacker‎, 06-15-2013 08:26 PM
    • Replies: 4
    • Views: 1,793
    06-16-2013, 08:53 PM Go to last post
  33. Principal Components Analysis

    Hello everybody, I have 15 time series consisting of returns on classic asset class investment (Stocks, Bonds, etc.) and some more advanced...

    Started by Bagira‎, 08-22-2014 08:45 AM
    • Replies: 0
    • Views: 1,068
    08-22-2014, 08:45 AM Go to last post
  34. Analysis of Categorical Data

    Hello friends, I'am doing intermediate statistics for second year and I'am having some issues with this chapter. My professor told...

    Started by Bajic‎, 03-06-2011 04:44 PM
    • Replies: 0
    • Views: 3,247
    03-06-2011, 04:44 PM Go to last post
  35. Goodness of fit test for categorical data with non-negative real numbersca

    An experiment that I conduct has 5 outcomes: A, B, C and D. I conduct 12 trials for this experiment. I observe, for example: Outcome : Frequency...

    Started by bakwas‎, 06-30-2016 09:48 AM
    categorical data, chi-square test, fishers exact, goodness-of-fit, model comparison
    • Replies: 2
    • Views: 1,518
    07-14-2016, 01:13 AM Go to last post
  36. 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: 25,781
    07-14-2009, 06:33 AM Go to last post
  37. Various Statistical Methods and their Functioning

    Hey everyone! I had a few questions regarding certain statistical methods I am researching. I've found a peer-reviewed journal article dealing...

    Started by Bananas‎, 10-28-2015 02:35 PM
    • Replies: 6
    • Views: 1,676
    11-09-2015, 06:36 PM Go to last post
  38. Anova with data reduction? (Experimental design)

    Hi, this is my first post, I hope to do nothing wrong like posting in the wrong area.:pag It happens that I did an experiment where I have a...

    Started by Bardock‎, 03-01-2017 08:59 AM
    anova observations, data, data analysis, reduction os data
    • Replies: 4
    • Views: 2,041
    03-03-2017, 01:37 AM Go to last post
  39. Age-Matching Groups Who Differ on Age

    I have two groups of children, A and B. Group A is the treatment group and has an age range of 5-7 years old. Group B is the control group and has an...

    Started by Barnzilla‎, 10-31-2008 01:40 PM
    • Replies: 4
    • Views: 5,846
    11-06-2008, 02:17 PM Go to last post
  40. Composite Scores - Approaches to Missing Data

    I have some data from an assessment form that has 25 items, all on a 5-point scale. What I'm looking at is the sum of these items. For a few...

    Started by Barnzilla‎, 11-20-2008 10:49 AM
    • Replies: 6
    • Views: 6,626
    12-12-2008, 09:43 AM Go to last post
  41. Comparing Improvement Between Groups - Best Approach?

    Perhaps this is an easy issue, but I wanted to throw it out anyway. I'm working on a dataset where there are two groups, both having pre- and...

    Started by Barnzilla‎, 11-28-2008 09:58 AM
    • Replies: 3
    • Views: 4,069
    01-14-2009, 10:27 PM Go to last post
  42. Help understanding separate- and joint- factor analyses in CFA and ESEM

    Folks, I am reading an article that tested 2 models--one with an hypothesized separate-factor relationship between five pairs of personality...

    Started by barrygrant‎, 02-02-2017 01:24 PM
    cfa, esem, factor analysis
    • Replies: 2
    • Views: 2,130
    02-03-2017, 10:43 AM Go to last post
  43. Bayesian updating or...?

    Hi There, I'm new to this forum and also not an experienced statistician but I have a question. In my research I'm facing a problem that...

    Started by Bas van Dijk‎, 04-18-2012 10:18 AM
    • Replies: 0
    • Views: 1,283
    04-18-2012, 10:18 AM Go to last post
  44. Anova?

    Hi I have a question regarding statistical tests. Assume that I have to run a program 5 times (5 iterations) and each time it gives me some...

    Started by Basemah‎, 03-10-2017 06:38 PM
    • Replies: 0
    • Views: 1,089
    03-10-2017, 06:38 PM Go to last post
  45. Multiple Measures (Different Variables) from Same Subjects

    Hi all! This is my first post. I hope someone can offer advice! I have a student with a seemingly simple analytical problem but I cannot...

    Started by bashinsk‎, 07-17-2016 10:25 AM
    • Replies: 2
    • Views: 783
    07-17-2016, 10:44 AM Go to last post
  46. Mass significance information criterion

    In search for the best linear regression model with 10 potential predictors I calculated the Schwarz Bayesian Criterion (SBC) for every possible...

    Started by Bassler‎, 03-13-2012 04:25 AM
    false positives, information criterion, mass significance, regression analysis
    • Replies: 0
    • Views: 50,219
    03-13-2012, 04:25 AM Go to last post
  47. Research using Fisher's Exact Test

    I'm writing a paper based on published, stats data. I'm looking for a real research example of where Fisher's exact test is used on an extremely low...

    Started by bassnectar‎, 04-23-2012 09:10 PM
    • Replies: 0
    • Views: 2,329
    04-23-2012, 09:10 PM Go to last post
  48. Comparing two overlapping samples in a tracking study

    I have a quick query about measures of sample accuracy in a tracking study with an overlapping (common) sample, and couldn't see anything here...

    Started by batfastard‎, 05-14-2012 01:19 AM
    comparing two samples
    • Replies: 0
    • Views: 1,378
    05-14-2012, 01:19 AM Go to last post
  49. bounded pareto distribution

    please any one can help me about the inversion method that is used to form a bounded pareto I can't understand the inversion method that is used in...

    Started by batooool‎, 12-17-2014 09:49 AM
    • Replies: 1
    • Views: 2,138
    12-20-2014, 04:25 PM Go to last post
  50. rxc contingency table: comparison between cells?

    Hello.I'm a dental student. I'm studying about how restorative methods are going to affect fracture pattern(fra.(fp)) of teeth. As a result I have a...

    Started by batosan‎, 06-24-2010 06:58 AM
    • Replies: 7
    • Views: 5,752
    06-26-2010, 04:52 AM Go to last post
  51. How to calculate sample size with low event frequency

    How do I calculate the sample size with a really low event frequency. I have a population of 2^32 with an unknown distribution. But a event...

    Started by battler‎, 11-17-2012 06:45 AM
    • Replies: 1
    • Views: 1,885
    11-17-2012, 01:40 PM Go to last post
  52. 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: 2,500
    04-08-2009, 10:21 AM Go to last post
  53. Bayesian: Defining priors from *same* data set you're modeling

    I believe that it is inappropriate to define prior distributions based on the same data you will be analyzing with those priors. In other words, the...

    Started by BayesianGirl‎, 09-22-2011 02:12 PM
    bayes, bayesian, bayesian inference, prior
    • Replies: 1
    • Views: 2,535
    09-22-2011, 07:47 PM Go to last post
  54. Bayesian Modeling Question

    :rolleyes:

    Started by bayesianman‎, 02-07-2013 10:55 PM
    • Replies: 3
    • Views: 1,412
    02-07-2013, 11:44 PM Go to last post
  55. population normally distributed, sample not, parametric test allowesd?

    Hi guys, Imagine I know that my variable of interest (say blood glucose) is normally distributed in the population. But I have a small sample and...

    Started by BBD‎, 12-08-2010 09:19 AM
    • Replies: 8
    • Views: 18,234
    02-19-2011, 07:26 PM Go to last post
  56. determening normality in repeated measures ANOVA

    Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

    Started by BBD‎, 01-29-2011 01:47 AM
    • Replies: 6
    • Views: 19,600
    07-19-2011, 05:11 AM Go to last post
  57. linear mixed model in SPSS - how?

    Hi guys, Imagine a nonrandomized trial with 2 groups (control and treatment) and two time points (pre and post). An ANOVA of change seems superior...

    Started by BBD‎, 02-02-2011 11:58 AM
    • Replies: 2
    • Views: 18,845
    02-25-2011, 02:56 PM Go to last post
  58. Red face Which test to use and Bonferroni - Helping a Beginner

    Hello all, I am looking for some help with the statistical analysis part of my masters project. The course is a practical one with very little by...

    Started by bbk‎, 03-11-2014 03:23 PM
    • Replies: 2
    • Views: 2,116
    03-11-2014, 05:11 PM Go to last post
  59. Customer problems vs R&D efficiency -> Statistic needed

    Hi guys, I have one case for which I need to find out how to prepare some statistic but to be honest I do not now how to approach the issues. ...

    Started by bciepluch‎, 11-23-2012 07:59 AM
    • Replies: 1
    • Views: 1,039
    11-24-2012, 07:55 AM Go to last post
  60. Multivariate Analysis assistance needed

    I have conducted a survey on online privacy sensitivity. Part of the survey used a previously-proven instrument to generate a Privacy Sensitivity...

    Started by bclifford‎, 10-14-2008 02:19 PM
    • Replies: 4
    • Views: 3,463
    10-14-2008, 07:42 PM Go to last post

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