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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: 16,234
    10-11-2014, 12:02 PM Go to last post
  1. Random Sampling - Missing Something Easy and I know it

    Hello everyone, I was asked to look over some data that came across my desk and I was stumped as to why it came out the way that it did. So the...

    Started by txsnowman‎, 07-24-2017 04:25 PM
    • Replies: 12
    • Views: 284
    Yesterday, 11:21 AM Go to last post
  2. How to show frequency data in analysis using Spearman's Rank?

    Hello, I am interested in finding out if there is any correlation between the the values that people ascribe to certain green spaces and the land...

    Started by Nemui‎, 07-23-2017 02:18 AM
    correlation analysis, frequency data, spearman's rank
    • Replies: 0
    • Views: 156
    07-23-2017, 02:18 AM Go to last post
  3. ITIL Remedy Help Desk Incident Data - Statistical Analysis for research

    Hello, My first thread on the board. It is my hope that I am posting this to the right thread I was wondering if you could help me with a...

    Started by hayaag‎, 07-14-2017 05:19 PM
    • Replies: 11
    • Views: 457
    07-20-2017, 09:46 AM Go to last post
  4. Can sensitivity be calculated in non-binary variables?

    Hi everyone, Is there any analogous measure of sensitivity and specificity for non-binary variables? For example, if I want to study the...

    Started by AJLRB‎, 07-19-2017 03:17 AM
    • Replies: 2
    • Views: 150
    07-20-2017, 05:27 AM Go to last post
  5. Weighted values from correlation coefficients

    I've been pressed to find a similar existing example of what I'm trying to do, but maybe i'm not phrasing it incorrectly. Essentially, I want to...

    Started by booptop‎, 07-19-2017 01:35 PM
    correlation coefficient, formula, weighted
    • Replies: 0
    • Views: 102
    07-19-2017, 01:35 PM Go to last post
  6. Analysis for different data scales

    Hello everyone. I have a question that how can I perform regression/correlation or hypotheses testing on a data which has different response...

    Started by emmasood‎, 07-19-2017 09:17 AM
    • Replies: 0
    • Views: 102
    07-19-2017, 09:17 AM Go to last post
  7. Missing value imputation on a non-normal distribution - EM vs Regression? Or else?

    Hi, Bit green when it comes to some of these methods, so please be gentle... but I'll try to provide as much info and concisely as possible. Any...

    Started by itsmrjack‎, 07-17-2017 11:12 AM
    expectation-maximization, missing data, non normal distribution, regression, spss
    • Replies: 1
    • Views: 130
    07-18-2017, 07:39 AM Go to last post
  8. [Statistica - Nested Anova] How to do a two-way nested anova?

    Hi, I'm trying to do a two-way nested anova in Statistica, but the results do not seen to be a two way model. In my study I need to compare if the...

    Started by Maria Costa‎, 07-14-2017 11:45 AM
    anova, anova ecology biology, anova statistica glm, neste anova, statistica
    • Replies: 0
    • Views: 122
    07-14-2017, 11:45 AM Go to last post
  9. Modelling continuous measurements

    In the attachment from a set of notes, a brief description of how we describe a continuous measurement is described. I have a few basic questions...

    Started by Jickro‎, 07-13-2017 04:20 PM
    • Replies: 0
    • Views: 131
    07-13-2017, 04:20 PM Go to last post
  10. Post HELP! Is using cross section semi series data correct?

    Hello all! It is so nice to know that there is such a forum to discuss statistical matters. Allow me to introduce myself. My Name is Yohanes...

    Started by Yohanes115‎, 07-06-2017 03:55 AM
    • Replies: 3
    • Views: 364
    07-11-2017, 01:58 PM Go to last post
  11. Question How to report t-test, CIs, cohen's d etc of log-transformed data

    I am wondering what is best/normal practice for reporting the results of an independent t-test of log-transformed data? For context, I am...

    Started by cxds‎, 07-08-2017 07:57 AM
    back transformation, cohen's d, log transformation, reporting, t-test two-sample
    • Replies: 0
    • Views: 134
    07-08-2017, 07:57 AM Go to last post
  12. Repeated Measures Anova for individuals?

    Hey everyone - I have a data set of 50ish subjects measured weekly for 24 weeks on several physical performance variables. I'd like to evaluate if...

    Started by LCs&c‎, 07-08-2017 06:19 AM
    • Replies: 0
    • Views: 185
    07-08-2017, 06:19 AM Go to last post
  13. Sample size calculation

    I have a normal distribution: log(xi/yi) ~N (0, c^2/yi). I need to work on the posterior distribution of c^2. I know c^2 follows a gamma...

    Started by drala54@yahoo.com‎, 06-29-2017 02:35 PM
    gamma distribution, sample size calculation
    • Replies: 1
    • Views: 187
    07-07-2017, 12:19 PM Go to last post
  14. Does covariate must be observed variable?

    In my study, I found significant interactions between treatment and order of sessions. Can I put the order variable as covariate in order to control...

    Started by PsychologyS‎, 07-03-2017 04:34 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 801
    07-06-2017, 07:07 PM Go to last post
  15. Which test should I use in an experimental study with a questionnaire?

    Hi all, I Need some help with my first experimental study. I would like to test the influence of different variables (x1, x2...) on an individual's...

    Started by yarela‎, 06-29-2017 11:53 PM
    • Replies: 1
    • Views: 303
    06-30-2017, 08:03 AM Go to last post
  16. Explanation of the Log likelihood criterion

    Hello all, I'm a counseling doctoral student working on dissertation with a mixed methods approach (though qual dominant) Part of my...

    Started by JD89‎, 06-28-2017 07:13 PM
    • Replies: 2
    • Views: 215
    06-29-2017, 07:16 PM Go to last post
  17. Repeated Measure for data with unequal group variance -- Friedman test

    I have a small, but untidy, dataset. I think I should use non-parametric tests, but I want to check my understanding since I have not often used...

    Started by JeffP‎, 06-28-2017 07:43 PM
    • Replies: 0
    • Views: 148
    06-28-2017, 07:43 PM Go to last post
  18. Comparing an ecological subsample to population

    I have 2 batches of tree species and abundance data collected for a city. The difference between them is the sampling strategy - one was random...

    Started by andyspeak‎, 06-23-2017 08:22 AM
    braycurtis, ecology, population, sampling
    • Replies: 1
    • Views: 282
    06-26-2017, 06:01 PM Go to last post
  19. comparing test results obtained on the basis of different sample sizes

    I have variables a1 and a2 with 57 observations each, and variables b1 and b2 with 29 observations each. I compare a1 with a2 by means of a...

    Started by Wilbert‎, 06-26-2017 05:11 AM
    effect size, sample sizes, t-test
    • Replies: 0
    • Views: 177
    06-26-2017, 05:11 AM Go to last post
  20. Best Stat Question Ever?

    Got this off Twitter (@galka_max) and found it interesting: If you choose an answer to this question at random, what is the chance you will get it...

    Started by The Game‎, 06-20-2017 09:42 PM
    • Replies: 7
    • Views: 422
    06-21-2017, 10:00 PM Go to last post
  21. Best tool to analyse data

    Hi, I have 20 years of data about calibration reports of various clients which primarily shows three-variables. COMPANY A YEAR 2001 1.)...

    Started by fahm‎, 06-21-2017 05:16 AM
    • Replies: 1
    • Views: 205
    06-21-2017, 10:59 AM Go to last post
  22. Sample Size Calc for Right Skewed Data

    I have a request from a person for a sample size calculation. When I requested information about the potential study data they provided two means and...

    Started by hlsmith‎, 06-09-2017 10:44 PM
    power, simulation
    • Replies: 14
    • Views: 842
    06-14-2017, 11:30 AM Go to last post
  23. Ridge Regression estimator

    Hi! I'm learning about the different penalized regression methods and I thought I'd stick with Ridge Regression because an analytical expression...

    Started by jamesmartinn‎, 06-12-2017 12:46 PM
    • Replies: 0
    • Views: 301
    06-12-2017, 12:46 PM Go to last post
  24. HMLR and ANOVAs instead of structural equation modelling

    Hi,* I have two studies within my thesis; The first is cross-sectional, and tests a theoretical framework of leadership - it explores the...

    Started by EmmaL‎, 06-06-2017 03:15 PM
    • Replies: 0
    • Views: 378
    06-06-2017, 03:15 PM Go to last post
  25. Question regarding methodology for Master dissertation

    Hey guys, I am a MSc Master student and am just about to write my final dissertation. Unfortunately I am a little bit unconfident with the...

    Started by CarinaSusan‎, 06-06-2017 11:31 AM
    • Replies: 0
    • Views: 214
    06-06-2017, 11:31 AM Go to last post
  26. repeated measures with covariates

    Hello, I have 2 group (sick/healthy), N=30 for each. the other variable is within- two measures time (short/ long). I want to add covariates. 1....

    Started by talgef‎, 06-05-2017 10:42 AM
    • Replies: 0
    • Views: 309
    06-05-2017, 10:42 AM Go to last post
  27. Need help figuring out which test to use!

    Hi there! I have a data file with the following information: pre-intervention depression score (t1), post-intervention depression score (t2),...

    Started by polubski‎, 06-04-2017 08:44 AM
    • Replies: 1
    • Views: 359
    06-04-2017, 11:29 AM Go to last post
  28. Within Subjects Analyses Advice

    Hi all, New user & first time poster. I'm finalizing my dissertation and am searching for similar examples as my project or some way to justify...

    Started by psychphd‎, 06-01-2017 07:12 PM
    repeated measures, repeated measures anova, within subjects
    • Replies: 0
    • Views: 431
    06-01-2017, 07:12 PM Go to last post
  29. Understanding and Calculating Credible Intervals

    Hi, I am having trouble understanding and calculating credible intervals. My goal is to understand confidence intervals vs. credible intervals. ...

    Started by bmac1‎, 05-14-2017 03:18 AM
    • Replies: 3
    • Views: 475
    06-01-2017, 06:50 PM Go to last post
  30. Post Probability from sample size

    I am working on taking a methodology class and when working on past exams I stumbled over this question. I used n=(z^2∗Var)/error^2 to obtain the...

    Started by brage‎, 05-30-2017 12:47 PM
    • Replies: 0
    • Views: 355
    05-30-2017, 12:47 PM Go to last post
  31. need help interpreting this Pearson R Correlation data

    Hi, I have a question and would welcome advice. I have conducted a pearson R stats test in SPSS and found that there is no relationship between...

    Started by returnofirv‎, 05-29-2017 06:44 AM
    • Replies: 4
    • Views: 409
    05-29-2017, 09:00 AM Go to last post
  32. How to develop a health coverage plan for a particular disease?

    Currently, there is no government health coverage for cancer in our country and the prevalence of this disease is increasing rapidly. So I have...

    Started by Blain Waan‎, 05-27-2017 08:18 AM
    health economist, life assurance, references
    • Replies: 0
    • Views: 351
    05-27-2017, 08:18 AM Go to last post
  33. Repeated measures, cross-sectional data check

    Hey folks, Netherlands here, struggeling with my masterthesis. I conducted an repeated measures experiment with four groups and two trials. The...

    Started by dinnuk‎, 05-27-2017 05:09 AM
    • Replies: 0
    • Views: 235
    05-27-2017, 05:09 AM Go to last post
  34. Repeated measures, cross-sectional data check

    Hey folks, Netherlands here, struggeling with my masterthesis. I conducted an repeated measures experiment with four groups and two trials. The...

    Started by dinnuk‎, 05-27-2017 05:01 AM
    • Replies: 0
    • Views: 218
    05-27-2017, 05:01 AM Go to last post
  35. 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: 383
    05-24-2017, 09:47 PM Go to last post
  36. Can I use fishers exact test in this situation?

    You can see in the below table that I have multiple cells that have expected counts <5 and cells with counts equal to zero + zero expected counts. As...

    Started by slamer2000‎, 05-15-2017 01:20 AM
    dichotomous, fishers exact, ordinal and categorical
    • Replies: 9
    • Views: 872
    05-22-2017, 08:47 PM Go to last post
  37. Linear Regression Master Thesis

    Dear all, I have a question regarding the regression method I need to apply to my research. This is only an extra method I have to apply in order...

    Started by sj13‎, 05-22-2017 07:57 AM
    • Replies: 0
    • Views: 363
    05-22-2017, 07:57 AM Go to last post
  38. Hypothesis Test for Unequal Variance When Populations are not Normally Distributed

    Hello, I have a situation where I would like to test the hypothesis that the variance of population one is great than the variance of population...

    Started by MikGZ‎, 05-17-2017 12:09 PM
    hypotheses testing, variance testing
    • Replies: 0
    • Views: 400
    05-17-2017, 12:09 PM Go to last post
  39. Question Research methodlogy

    Hi, I conducted experiments as part of a research which assumed a hypothesis regarding the behavior of participants using a system. I collected...

    Started by sandiskuser‎, 05-14-2017 12:59 PM
    • Replies: 1
    • Views: 431
    05-15-2017, 10:52 AM Go to last post
  40. Statistical method to rank Likert-items

    Dear Readers, Currently, I am conducting a study to investigate the need for assistance with a certain process. I used a survey including...

    Started by MvZ‎, 05-08-2017 04:14 AM
    likert, likert scale, preference, rank order data analysis, ranking
    • Replies: 10
    • Views: 846
    05-15-2017, 09:33 AM Go to last post
  41. Unbalanced designs in PERMANOVA and Resampling Methods

    Dear all, I am a new member and I have to say I am not sure if this is the right section for my question (I am working in ecology). I am...

    Started by Yser‎, 05-11-2017 06:29 AM
    bootstrap, monte carlo, permanova, unequal sample sizes
    • Replies: 1
    • Views: 304
    05-11-2017, 06:20 PM Go to last post
  42. Time required in a retrospective study

    Hello I'm describing the dispatches of a drug from a hospital pharmacy and I have the data of each one of them Between a period of two years....

    Started by veron‎, 05-10-2017 07:01 PM
    • Replies: 2
    • Views: 428
    05-11-2017, 05:25 PM Go to last post
  43. Unbalanced designs in PERMANOVA and Resampling Methods

    Dear all, I am a new member here, working mainly in Ecology. I hope this is the right section to ask my question. I am dealing with unbalanced...

    Started by Yser‎, 05-11-2017 07:16 AM
    bootstrap, permanova, unequal sample size
    • Replies: 0
    • Views: 381
    05-11-2017, 07:16 AM Go to last post
  44. meta-analysis vs. random effect combined analysis

    I have data from 200 similar studies, all measuring the same effect of a continuous independent variable on the same continuous response. I say...

    Started by szm‎, 05-10-2017 05:58 AM
    degrees of freedom, meta-analysis, mixed model, random effect, sample size
    • Replies: 0
    • Views: 364
    05-10-2017, 05:58 AM Go to last post
  45. stat questions on multicollinearity

    I'm working through some practice on regression analysis and wanted to confirm. My attempt is below. Thanks (1) The correlation between two...

    Started by shane414‎, 05-09-2017 04:52 AM
    statistics
    • Replies: 0
    • Views: 466
    05-09-2017, 04:52 AM Go to last post
  46. Which tests to use in these examples? Wilcoxon etc.

    I'm pretty clueless, but would appreciate any help very much. I have: Group 1: went from nothing, to receiving surgery 1, and then later on...

    Started by LasseNordenhem‎, 05-08-2017 06:05 AM
    mann whitney, non parametric tests, wilcoxon
    • Replies: 4
    • Views: 478
    05-08-2017, 07:40 AM Go to last post
  47. Does frequency distribution matter when using nominal/ordinal data?

    I want to do relationship analysis between different variables from questionnaire results that I've just collected and I've recently learned that you...

    Started by slamer2000‎, 05-07-2017 01:17 PM
    frequency distribution, nominal data, normal distribution, ordinal data
    • Replies: 1
    • Views: 443
    05-07-2017, 05:41 PM Go to last post
  48. Repeated atypical measures..help needed

    Hey all, thanks again for the great group and assistance. I have a research of 30 patients (one sample) which performed cognitive tests in the...

    Started by XPeriment‎, 04-28-2017 11:52 AM
    • Replies: 3
    • Views: 791
    05-01-2017, 06:47 PM Go to last post
  49. How to analyze change in performance

    Greetings, I have a task that two groups of participants completed at Time 1 and Time 2. I was planning to conduct a repeated measures ANOVA,...

    Started by Luxor‎, 04-28-2017 09:17 AM
    • Replies: 2
    • Views: 536
    04-28-2017, 12:11 PM Go to last post
  50. [R] Estimation of the emprical distribution

    Hi all, I was wondering if there's an R package online that automatically estimates the best distribution of my empirical data and gives the...

    Started by maaarten9‎, 04-27-2017 10:43 AM
    distribution, package
    • Replies: 2
    • Views: 435
    04-27-2017, 01:26 PM Go to last post
  51. Can i use the results from a PCA if the matrix is 'not positive definite'

    Hi, I have a 'not positive definite' correlation matrix having done a principal component analysis (PCA) on SPSS. The data i have used is from a...

    Started by shaunx‎, 04-27-2017 03:11 AM
    correlation matrix, factor analysis, pca, pca analysis, spss
    • Replies: 1
    • Views: 406
    04-27-2017, 10:47 AM Go to last post
  52. Can you use correlation for percentages?

    I have two variables: the number of employees who work from home in the firm and the number of independent contractors in the firm - and I have this...

    Started by sas‎, 04-24-2017 11:22 AM
    correlation, correlation analysis
    • Replies: 0
    • Views: 431
    04-24-2017, 11:22 AM Go to last post
  53. Question help needed urgently for my dissertation what analysis method do i use

    hi i urgently need some help to do results section of my dissertation as it due soon by early may what analysis do i use and how do i interpret...

    Started by psychelp‎, 04-24-2017 09:08 AM
    please help me on this
    • Replies: 0
    • Views: 338
    04-24-2017, 09:08 AM Go to last post
  54. Hotelling's T2 test and chi2 distributions

    For the 1-2 weeks I've been trying to decompose the T2 statistic into two independent chi2-distributed statistics, but have had no success. I'm...

    Started by MikeC‎, 04-23-2017 01:34 PM
    • Replies: 0
    • Views: 407
    04-23-2017, 01:34 PM Go to last post
  55. how it comes Exact sig = 1

    hello, please help me to intrepret the Mann whitney output figuring in the picture bellow.And especially if the (exact sig = 1) is coorect ? ...

    Started by ilyes‎, 04-22-2017 06:02 AM
    • Replies: 0
    • Views: 454
    04-22-2017, 06:02 AM Go to last post
  56. SPSS Correlation of single variable and independent variables

    Hello, I am working in spss 23 and I'm stuck. I have data for which I am attempting to determine if certain color of a personality (there are 4...

    Started by kellytwilliams‎, 04-21-2017 11:01 AM
    correlation analysis, spss 23
    • Replies: 3
    • Views: 410
    04-22-2017, 02:48 AM Go to last post
  57. Statistical report

    Hi, I am a first-year business student that is taking a stats class. I have a report assignment with the requirement of an executive survey and...

    Started by Sam1218‎, 04-16-2017 09:17 PM
    descriptive statistics, executive summary, graphical representation, inferential statistics, statistical report
    • Replies: 0
    • Views: 708
    04-16-2017, 09:17 PM Go to last post
  58. Can I use an independent t-test to test for significant differences over time?

    I have a 50 year time series (2012-2062), and I would like to test to see whether sig. differences exist between two groups of data subjected to...

    Started by Miz123‎, 04-15-2017 08:20 AM
    t-test
    • Replies: 0
    • Views: 393
    04-15-2017, 08:20 AM Go to last post
  59. GOF measures

    When we validate a statistical model, should we only consider the traditional Goodness-Of-Fit measures? Are there other ways in which the model...

    Started by shane414‎, 04-14-2017 03:09 AM
    • Replies: 1
    • Views: 461
    04-14-2017, 10:48 AM Go to last post
  60. GOF Analysis/Discussion

    What actions constitute an analysis of goodness-of-fit for a regression model? What are the typical graphical displays used in this analysis of...

    Started by shane414‎, 04-14-2017 02:54 AM
    regression analysis
    • Replies: 1
    • Views: 389
    04-14-2017, 10:33 AM Go to last post

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