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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: 19,403
    10-11-2014, 12:02 PM Go to last post
  1. 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: 1,842
    07-06-2017, 07:07 PM Go to last post
  2. 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: 506
    06-30-2017, 08:03 AM Go to last post
  3. 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: 589
    06-29-2017, 07:16 PM Go to last post
  4. 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: 645
    06-28-2017, 07:43 PM Go to last post
  5. 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: 622
    06-26-2017, 06:01 PM Go to last post
  6. 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: 370
    06-26-2017, 05:11 AM Go to last post
  7. 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: 618
    06-21-2017, 10:59 AM Go to last post
  8. 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: 1,885
    06-14-2017, 11:30 AM Go to last post
  9. 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: 682
    06-12-2017, 12:46 PM Go to last post
  10. 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: 643
    06-06-2017, 03:15 PM Go to last post
  11. 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: 594
    06-06-2017, 11:31 AM Go to last post
  12. 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: 930
    06-05-2017, 10:42 AM Go to last post
  13. 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: 1,068
    06-04-2017, 11:29 AM Go to last post
  14. 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: 1,068
    06-01-2017, 07:12 PM Go to last post
  15. 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: 1,024
    06-01-2017, 06:50 PM Go to last post
  16. 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: 867
    05-30-2017, 12:47 PM Go to last post
  17. 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: 1,020
    05-29-2017, 09:00 AM Go to last post
  18. 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: 811
    05-27-2017, 08:18 AM Go to last post
  19. 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: 894
    05-27-2017, 05:09 AM Go to last post
  20. 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: 695
    05-27-2017, 05:01 AM Go to last post
  21. 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: 832
    05-24-2017, 09:47 PM Go to last post
  22. 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: 2,238
    05-22-2017, 08:47 PM Go to last post
  23. 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: 871
    05-22-2017, 07:57 AM Go to last post
  24. 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: 693
    05-17-2017, 12:09 PM Go to last post
  25. 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: 943
    05-15-2017, 10:52 AM Go to last post
  26. 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: 1,604
    05-15-2017, 09:33 AM Go to last post
  27. 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: 846
    05-11-2017, 06:20 PM Go to last post
  28. 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: 983
    05-11-2017, 05:25 PM Go to last post
  29. 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: 1,060
    05-11-2017, 07:16 AM Go to last post
  30. 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: 1,507
    05-10-2017, 05:58 AM Go to last post
  31. 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
    • Replies: 0
    • Views: 1,341
    05-09-2017, 04:52 AM Go to last post
  32. 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: 1,381
    05-08-2017, 07:40 AM Go to last post
  33. 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: 1,340
    05-07-2017, 05:41 PM Go to last post
  34. 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: 1,513
    05-01-2017, 06:47 PM Go to last post
  35. 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: 975
    04-28-2017, 12:11 PM Go to last post
  36. [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: 864
    04-27-2017, 01:26 PM Go to last post
  37. 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: 846
    04-27-2017, 10:47 AM Go to last post
  38. 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: 978
    04-24-2017, 11:22 AM Go to last post
  39. 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: 709
    04-24-2017, 09:08 AM Go to last post
  40. 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: 882
    04-23-2017, 01:34 PM Go to last post
  41. 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: 1,011
    04-22-2017, 06:02 AM Go to last post
  42. 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: 692
    04-22-2017, 02:48 AM Go to last post
  43. 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: 1,334
    04-16-2017, 09:17 PM Go to last post
  44. 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
    • Replies: 0
    • Views: 842
    04-15-2017, 08:20 AM Go to last post
  45. 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: 772
    04-14-2017, 10:48 AM Go to last post
  46. 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: 885
    04-14-2017, 10:33 AM Go to last post
  47. Dealing with censored dates as regressors

    I'm estimating a linear model, with one of the independent variables being a date of appearance. I consider the date to be a minimum date of...

    Started by nbi‎, 03-30-2017 07:30 AM
    censoring, regression, time-series
    • Replies: 2
    • Views: 1,001
    04-13-2017, 11:31 AM Go to last post
  48. [ANOVA - Repeated Measures] When to include subject as a random effect?

    I have an eye tracking study in which two groups of subjects (patient and control) are completing a face recognition task in which they learn a set...

    Started by ProfCorrow‎, 03-10-2017 12:26 PM
    random effect, repeated measures anova
    • Replies: 2
    • Views: 1,431
    04-11-2017, 12:00 PM Go to last post
  49. Regression Analysis

    I'm trying to better understand linear regression by the following questions. (1) Linear regression assumes: a. The relationship between X...

    Started by msoe414‎, 04-07-2017 04:49 AM
    statistics help
    • Replies: 5
    • Views: 1,766
    04-07-2017, 10:35 PM Go to last post
  50. How to best maximize sample size for a third order factor CFA

    Dear all, I have a sample size question that I'd like to consult your opinions on. In our lab, we gave a particular measure to roughly 450...

    Started by myautumn28‎, 04-07-2017 10:34 AM
    • Replies: 0
    • Views: 1,191
    04-07-2017, 10:34 AM Go to last post
  51. Advantages/disadvantages of computing composite score these ways

    Hi, I'd highly appreciate your recommendations for a research I'm doing. More specifically, I'd like to know the advantages, disadvantages, and...

    Started by StatTalker‎, 04-03-2017 08:05 AM
    • Replies: 2
    • Views: 1,312
    04-04-2017, 02:18 AM Go to last post
  52. comparing section in a scale using spss

    Hi everyone; hope you are doing well, I am actually conducting a research, and I am comparing between a pre and post scale. my problem is that...

    Started by rukia‎, 03-24-2017 07:54 AM
    • Replies: 4
    • Views: 1,635
    04-02-2017, 09:55 PM Go to last post
  53. how do we estimate regression parameters in survival analysis

    Dear All, I would like to ask how to estimate regression parameters(Beta) in Accelerated Failure Time Model? Does anybody knows any resources?...

    Started by masarimk‎, 03-25-2017 11:58 PM
    • Replies: 3
    • Views: 1,497
    04-02-2017, 10:43 AM Go to last post
  54. Is survey design statistically correct?

    I want to track improvements in how yoga class participants feel on various variables (e.g. energy level, sleep quality, pain felt, mental...

    Started by johnsif‎, 03-30-2017 02:47 AM
    • Replies: 8
    • Views: 1,549
    04-02-2017, 10:33 AM Go to last post
  55. Smile Which test to use?

    I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction...

    Started by sf27‎, 04-01-2017 03:26 AM
    • Replies: 0
    • Views: 1,345
    04-01-2017, 03:26 AM Go to last post
  56. Selecting of statistical test?

    I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction...

    Started by sf27‎, 04-01-2017 03:20 AM
    chi square, statistic test, t-test
    • Replies: 0
    • Views: 1,002
    04-01-2017, 03:20 AM Go to last post
  57. Meta-analysis - Can I investigate mediation effects for the effectiveness of training

    Hello everyone, I am currently working on my Master thesis on moderators and mediators for the effectiveness of cross-cultural training (CCT). I...

    Started by ChristinaK91‎, 03-25-2017 11:34 AM
    mediating effect, mediator, meta-analysis
    • Replies: 0
    • Views: 1,158
    03-25-2017, 11:34 AM Go to last post
  58. Factor analysis with multiple constructs

    Hi all, Have a question related to factor analysis and how to execute it. For instance, in a survey you measure 3 seperate constructs, and use 5...

    Started by cs_ut‎, 03-23-2017 09:28 AM
    • Replies: 2
    • Views: 1,359
    03-24-2017, 08:36 AM Go to last post
  59. 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: 1,642
    03-23-2017, 12:55 PM Go to last post
  60. Alternatives for Non-normality and Inequality of Variance?

    I've been working with a rather difficult data set for over a week with no real progress. I am trying to compare the effect of temperature (15, 20,...

    Started by nebulus‎, 03-17-2017 11:04 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,920
    03-22-2017, 07:22 AM Go to last post

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