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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: 13,446
    10-11-2014, 12:02 PM Go to last post
  1. 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: 321
    05-22-2017, 08:47 PM Go to last post
  2. 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: 92
    05-22-2017, 07:57 AM Go to last post
  3. 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: 186
    05-17-2017, 12:09 PM Go to last post
  4. 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: 150
    05-15-2017, 10:52 AM Go to last post
  5. 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: 365
    05-15-2017, 09:33 AM Go to last post
  6. 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: 2
    • Views: 162
    05-15-2017, 02:10 AM Go to last post
  7. 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: 91
    05-11-2017, 06:20 PM Go to last post
  8. 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: 161
    05-11-2017, 05:25 PM Go to last post
  9. 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: 96
    05-11-2017, 07:16 AM Go to last post
  10. 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: 98
    05-10-2017, 05:58 AM Go to last post
  11. 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: 180
    05-09-2017, 04:52 AM Go to last post
  12. 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: 193
    05-08-2017, 07:40 AM Go to last post
  13. 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: 126
    05-07-2017, 05:41 PM Go to last post
  14. 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: 432
    05-01-2017, 06:47 PM Go to last post
  15. 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: 261
    04-28-2017, 12:11 PM Go to last post
  16. [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: 187
    04-27-2017, 01:26 PM Go to last post
  17. 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: 155
    04-27-2017, 10:47 AM Go to last post
  18. 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: 209
    04-24-2017, 11:22 AM Go to last post
  19. 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: 141
    04-24-2017, 09:08 AM Go to last post
  20. 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: 148
    04-23-2017, 01:34 PM Go to last post
  21. 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: 207
    04-22-2017, 06:02 AM Go to last post
  22. 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: 220
    04-22-2017, 02:48 AM Go to last post
  23. 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: 380
    04-16-2017, 09:17 PM Go to last post
  24. 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: 208
    04-15-2017, 08:20 AM Go to last post
  25. 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: 248
    04-14-2017, 10:48 AM Go to last post
  26. 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: 181
    04-14-2017, 10:33 AM Go to last post
  27. 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: 275
    04-13-2017, 11:31 AM Go to last post
  28. [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: 531
    04-11-2017, 12:00 PM Go to last post
  29. 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: 483
    04-07-2017, 10:35 PM Go to last post
  30. 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: 228
    04-07-2017, 10:34 AM Go to last post
  31. 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: 393
    04-04-2017, 02:18 AM Go to last post
  32. 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: 478
    04-02-2017, 09:55 PM Go to last post
  33. 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: 529
    04-02-2017, 10:43 AM Go to last post
  34. 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: 438
    04-02-2017, 10:33 AM Go to last post
  35. 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: 264
    04-01-2017, 03:26 AM Go to last post
  36. 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: 153
    04-01-2017, 03:20 AM Go to last post
  37. 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: 384
    03-25-2017, 11:34 AM Go to last post
  38. 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: 358
    03-24-2017, 08:36 AM Go to last post
  39. 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: 546
    03-23-2017, 12:55 PM Go to last post
  40. 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: 1,115
    03-22-2017, 07:22 AM Go to last post
  41. How to combine correlated vector-valued estimates

    I'd like to combine several vector-valued estimates of a physical quantity in order to obtain a better estimate with less uncertainty. As in the...

    Started by WhiteHaired‎, 03-21-2017 05:50 AM
    combine estimates, correlated estimates, uncertainty propagation, vector-valued estimates, weighted mean
    • Replies: 1
    • Views: 349
    03-21-2017, 03:03 PM Go to last post
  42. Interpreting CFA Output

    I have recently been performing confirmatory factor analysis to assess model fit for an established measure, the measure has previously been...

    Started by RPortman7‎, 03-20-2017 07:33 AM
    cfa, dataanalysis
    • Replies: 0
    • Views: 346
    03-20-2017, 07:33 AM Go to last post
  43. Data Collection

    I am an education major and am lost in my research class! I have the research question of, "How does classical music playing in the background...

    Started by GradStudent17‎, 03-15-2017 06:53 AM
    • Replies: 1
    • Views: 482
    03-15-2017, 07:28 AM Go to last post
  44. 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: 471
    03-13-2017, 04:52 PM Go to last post
  45. clasiffy - weka

    can I use cfs setset evaluator /greedy stepwise for correlated? Which attributes seem to be most linked to the class attribute? how do understand...

    Started by raju1‎, 03-12-2017 04:33 PM
    • Replies: 0
    • Views: 283
    03-12-2017, 04:33 PM Go to last post
  46. Bayesian analog to Generalized Estimating Equations?

    GEE2 (second order generalized estimating equations, see Prentice and Zhao 1991 Biometrics) can be used to model the mean and covariance of a...

    Started by jaron003‎, 03-10-2017 04:00 PM
    • Replies: 1
    • Views: 483
    03-11-2017, 10:46 AM Go to last post
  47. 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: 387
    03-10-2017, 06:38 PM Go to last post
  48. How to compare R2 across three independent samples?

    Is it possible to compare an R2 value across three independent samples? I am familiar with the Fisher r to z test, but this is only for correlation...

    Started by newbie8888‎, 03-07-2017 01:00 PM
    anova, regression
    • Replies: 0
    • Views: 571
    03-07-2017, 01:00 PM Go to last post
  49. statistical inference in materials science

    Hi all, I'm currently doing a quick study into a material where grain size could potentially affect a desired property Y, but I'm uncertain about...

    Started by dhvd90‎, 03-07-2017 12:17 PM
    • Replies: 0
    • Views: 384
    03-07-2017, 12:17 PM Go to last post
  50. 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: 726
    03-05-2017, 09:09 AM Go to last post
  51. Difference between two independent proportions

    Hello, I am not a statistician, however, for my latest small research, I would like to test whether there is a difference between two independent...

    Started by Zuzanah‎, 11-07-2016 07:10 AM
    chi-square, proportion test, z-test
    • Replies: 4
    • Views: 2,119
    03-03-2017, 01:48 PM Go to last post
  52. Analysing Limited Data

    Help! For my thesis I involuntary have a small dataset due to a limited population. I was thinking about analysing this data with the statistical...

    Started by IngevanderBorg‎, 03-03-2017 06:52 AM
    anova, bayesian analysis, nonparametric, small data set
    • Replies: 0
    • Views: 406
    03-03-2017, 06:52 AM Go to last post
  53. 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: 768
    03-03-2017, 01:37 AM Go to last post
  54. Finding my control group PSM, Matching or regression model and correct for confounder

    Hey there, First off I'm hoping I'm posting this in the right place. I'm doing research where there is a patient group of n=9 that underwent...

    Started by Longo‎, 03-01-2017 01:43 PM
    confounders, control group, help needed, matching, regression model
    • Replies: 3
    • Views: 651
    03-02-2017, 09:41 PM Go to last post
  55. Correcting alpha for multiple anovas

    Hi! I have 7 different properties, all independent, that are being mesured. Each property has a control and three disease groups. All independent....

    Started by Szkeptik‎, 02-25-2017 03:30 PM
    • Replies: 1
    • Views: 684
    03-02-2017, 01:38 PM Go to last post
  56. Statistic test for comparing time budget?

    Hi all I am a beginner in statistics and I have the following difficulty. I video-recorded some animals in two populations and I calculated...

    Started by Christinec‎, 03-02-2017 03:44 AM
    • Replies: 1
    • Views: 659
    03-02-2017, 11:20 AM Go to last post
  57. ANOVA or t-test?

    I want to test 2 different treatments (diets), repeating each treatment 3 times on 25 individuals independent samples. After each repetition, four...

    Started by marloncalispa‎, 02-20-2017 12:23 PM
    anova, t-test
    • Replies: 2
    • Views: 860
    03-01-2017, 12:20 PM Go to last post
  58. Select two variables with values closest to 50 among 5 variables

    I have a problem regarding the analysis of a big dataset, that I can't seem to tackle by myself! Help would be really appreciated: This is the...

    Started by tastea‎, 03-01-2017 09:41 AM
    • Replies: 0
    • Views: 398
    03-01-2017, 09:41 AM Go to last post
  59. Dealing with unknown dependencies between variables

    Hi! I have a system where I'm studying 3 different diseases, however they share some pathological similarities. There is no data on them being...

    Started by Szkeptik‎, 02-26-2017 08:31 AM
    • Replies: 2
    • Views: 986
    02-26-2017, 10:51 PM Go to last post
  60. Exclamation Need help selecting appropriate test

    I'm currently trying to select the appropriate significance test and test of association and would really appreciate some help. My independent...

    Started by geosfranklin‎, 02-26-2017 02:38 PM
    chi sq test, ordinal and categorical
    • Replies: 0
    • Views: 536
    02-26-2017, 02:38 PM Go to last post

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