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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: 19,426
    10-11-2014, 12:02 PM Go to last post
  1. Time Series or GARCH? Can't decide..

    Hello, for a research thesis I want to compare returns of different asset classes with another. Think: stock indices, bond indices, a commodity...

    Started by Mastauser‎, 08-21-2016 04:47 AM
    • Replies: 3
    • Views: 1,904
    09-18-2016, 09:24 AM Go to last post
  2. Can I use gls if I don't need to use mixed models and var is not structured?

    I have a continuous variable that is related to a covariable linearly. I need to compare this relationship between months (24 months), but the...

    Started by mgow‎, 09-14-2016 08:17 AM
    generalised least squares, heteroscedasticity, independent observations, nlme
    • Replies: 5
    • Views: 1,927
    09-14-2016, 04:01 PM Go to last post
  3. Comparing two datasets in terms of anonymisation

    Hi guys, hope you are doing good! I have quite the conundrum; I'm trying to figure out different ways I can cross-examine two datasets (D1 and...

    Started by jbwettergreen‎, 09-13-2016 03:07 AM
    • Replies: 0
    • Views: 1,583
    09-13-2016, 03:07 AM Go to last post
  4. Monte Carlo Simulation , a simpler version

    Hi all, I have asked this question before, but it seems I was not asked it in an appropriate way, so I draw the following flowchart which I think...

    Started by mohsenhs82‎, 09-12-2016 03:21 AM
    • Replies: 2
    • Views: 1,860
    09-12-2016, 04:59 AM Go to last post
  5. Question Gage R&R results to usable data

    This is for my thesis & i'm stumped. Please help. A Gage R&R was done comparing two inspection tools to each other. These tools measure the section...

    Started by erica56458‎, 09-12-2016 03:58 AM
    gage r&r, precision, probability
    • Replies: 1
    • Views: 1,381
    09-12-2016, 04:21 AM Go to last post
  6. Monte Carlo for Weibull and Lognornam distributions in R

    I am involved in a project which needs statistic and computer science. I am more of a computer guy so I appreciate any statistical help. I am doing...

    Started by mohsenhs82‎, 09-11-2016 01:20 AM
    log-normal distribution, monte carlo, weibull distribution
    • Replies: 3
    • Views: 1,413
    09-12-2016, 03:26 AM Go to last post
  7. repeated cross sectional-partially changed study population

    I have a large dataset (n=11804) that includes data from a cross sectional study conducted in 2013, 2014 and 2015 in patients in nursing homes...so...

    Started by Viv92‎, 09-09-2016 03:33 AM
    analysis, drop outs, repeated cross sectional
    • Replies: 0
    • Views: 707
    09-09-2016, 03:33 AM Go to last post
  8. How to determine if two R2 values (rsquared) are significantly different

    Hi TalkStats :):):) I have fit two different functions (f1,f2) to some data. These functions have different forms (see below), in that they have...

    Started by mahdieh.godazgar‎, 09-07-2016 10:29 AM
    f statistic, f test, fit statistics, least squares regression, rsquare
    • Replies: 4
    • Views: 2,417
    09-08-2016, 12:28 PM Go to last post
  9. Exclamation Quasi-experiments and variable manipulation

    Hello, I am new here so forgive me if I seem amateur, After doing a lot of research and discussion with other students I have continued to find...

    Started by elle_‎, 09-08-2016 12:25 AM
    design of experiments, independ variable, manipulation, quasi-experimental, statisitcs
    • Replies: 0
    • Views: 1,466
    09-08-2016, 12:25 AM Go to last post
  10. [Finite population correction(FPC)] Did I discover FPC(nHr)?

    talkstats members are knowledgeable. Anybody knows there is any precursor already published FPC(H^n_r). The journals rejected my paper. Finite...

    Started by BenchPlayer‎, 09-07-2016 08:38 AM
    estimator, fpc
    • Replies: 3
    • Views: 2,249
    09-07-2016, 09:09 AM Go to last post
  11. Comparing two groups - best test to use?

    Hi all, I have two sets of data - hospital admission lengths (measured in whole hours) grouped in to 'younger patients' and 'older patients'....

    Started by AbnormallyDistributed‎, 08-29-2016 10:48 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,875
    09-06-2016, 03:43 PM Go to last post
  12. HELP - citation model in R

    Hello everyone. I need help with the citation model as explained in This article "Bibliometric tools applied to analytical articles: the example...

    Started by terstat‎, 08-18-2016 10:15 AM
    bibliometric, citation, model, r software, statistic
    • Replies: 3
    • Views: 1,961
    09-05-2016, 09:04 AM Go to last post
  13. Population estimation

    Hi, Just would like to ask for some of your valuable advice! I am working on the project which would like to use the small sample to estimate...

    Started by Ming‎, 09-02-2016 09:59 PM
    • Replies: 3
    • Views: 1,168
    09-03-2016, 08:47 AM Go to last post
  14. Bayesian analysis of logistic dependent variable, with between and within subjects in

    I have a dataset consisting of two groups of participants (25 participants in one group and 26 in the other), with each participating in two...

    Started by idif‎, 09-01-2016 02:19 AM
    bayesian analysis, hierarchical bayesian, jags
    • Replies: 0
    • Views: 769
    09-01-2016, 02:19 AM Go to last post
  15. comparing multiple means between multiple groups

    Hi Everyone, Pretty new to stats and want to make sure that I am running the right stats. I have means (measured in months) from multiple...

    Started by chiccaboom‎, 08-30-2016 12:28 PM
    statistical test
    • Replies: 0
    • Views: 826
    08-30-2016, 12:28 PM Go to last post
  16. Smile Calculate sample size?

    You are interested in studying the relationship between sodium consumption and the development of hypertension. 32% of Americans are hypertensive...

    Started by Jadan89‎, 08-29-2016 11:28 PM
    effective size, power alpha sample size, sample size
    • Replies: 0
    • Views: 1,071
    08-29-2016, 11:28 PM Go to last post
  17. Smile Probability equation X > number

    Long time lurker, first time poster! All help much appreciated! I have one equation being compared to a number: X = any positive real number ...

    Started by TheFermat‎, 08-19-2016 09:38 PM
    • Replies: 3
    • Views: 1,351
    08-29-2016, 07:21 PM Go to last post
  18. Zero vs missing data

    Hello I have a question regarding 0 (=zero) vs missing data. If I have an observation that have many variables but one of the variable is not...

    Started by Hedva‎, 08-28-2016 08:02 AM
    • Replies: 3
    • Views: 1,115
    08-29-2016, 03:12 AM Go to last post
  19. Smile What type of ANOVA test should I do?

    The same participants are exposed to two different screen sizes 27" (stimulus A) and screen size 9.7" (stimulus B). Independent var is "screen" with...

    Started by uxk8396‎, 08-27-2016 09:52 PM
    ancova, anova, descriptive statistics, multivariate analysis
    • Replies: 3
    • Views: 1,373
    08-28-2016, 07:31 PM Go to last post
  20. Stuggling with choosing the correct test.

    So I am analyzing data for a student outside of my department. They are looking to see the differences in exam scores between two different methods...

    Started by dvtolusso‎, 08-19-2016 02:26 PM
    • Replies: 9
    • Views: 2,043
    08-27-2016, 01:11 PM Go to last post
  21. Change over time

    Hi all, I am looking at patient activity for a disease and have patient numbers for 5 years (2009-2013). I have numbers for 4 different types: ...

    Started by Duggas03‎, 08-26-2016 06:03 AM
    patients, time trend
    • Replies: 2
    • Views: 847
    08-26-2016, 06:55 PM Go to last post
  22. split-split plot with continuous subplot variable

    Hello I am trying to analyze data from a split-split-plot design. The sub-plot is a continuous factor and since we suspect a non-linear...

    Started by szm‎, 08-23-2016 05:54 AM
    ancova, random effects, sas, split-plot
    • Replies: 1
    • Views: 988
    08-26-2016, 06:44 AM Go to last post
  23. chi-square test for nested models

    Consider 2 models A and B. A (5 free parameters) is nested within B (6 free parameters). Imagine that we do an experiment and acquire data from N =...

    Started by mathieu‎, 08-24-2016 03:26 PM
    chi-square test, nested models
    • Replies: 2
    • Views: 1,637
    08-25-2016, 11:00 PM Go to last post
  24. What tests and analysis for 50 year data collected on fashion trends

    So, it is said that whatever is in fashion once comes back someday or the other. We have collected data on 10 different garment types, each having 5...

    Started by sshresth12‎, 08-25-2016 02:38 AM
    cyclicality, research, time series analysis, trend detection
    • Replies: 1
    • Views: 771
    08-25-2016, 10:31 AM Go to last post
  25. How does one develop statistical models to compensate for weakness in public data?

    Hi everyone. I have an interview coming up and the role is data centric. I have a strong knowledge of data and management, however I have never...

    Started by Jaysin‎, 08-23-2016 05:28 PM
    • Replies: 7
    • Views: 1,186
    08-24-2016, 11:08 AM Go to last post
  26. noncentral t distribution

    Please help me prove that the pdf of a noncentral t distribution is a valid pdf. That is, to prove that the integral of the pdf of noncentral t...

    Started by katlego‎, 08-21-2016 09:37 PM
    • Replies: 0
    • Views: 995
    08-21-2016, 09:37 PM Go to last post
  27. Bhattacharyya metric as a chi-squared type statistic

    Hi all, I'm reading about the relation between the Bhattacharyya metric and the chi-squared metric:...

    Started by snufkin‎, 08-21-2016 05:47 PM
    • Replies: 0
    • Views: 821
    08-21-2016, 05:47 PM Go to last post
  28. Appropriate sample size for unusual "populations"

    There seems to be a lot of literature about determining sample size based on population, margin of error and confidence level. This seems difficult...

    Started by ahhk22‎, 08-15-2016 10:35 PM
    sample size determination
    • Replies: 2
    • Views: 945
    08-16-2016, 08:22 PM Go to last post
  29. Which statistical model to choose?

    Hey guys, I have a few hypotheses in a randomized control trial that I would like to test: 1) Effect of a treatment on several outcome...

    Started by floriisco‎, 08-15-2016 12:58 PM
    hyposteses testing, hypothesis testing, interaction effect
    • Replies: 0
    • Views: 909
    08-15-2016, 12:58 PM Go to last post
  30. HELP- Cumulative meta-analyses conceptual question!

    Hi, Based on the premise that cumulative meta-analysis is a "chronological combining of the experiments will show if there is a consistency in the...

    Started by croberto‎, 08-14-2016 05:27 PM
    • Replies: 1
    • Views: 1,381
    08-14-2016, 08:52 PM Go to last post
  31. Question Sig diff means - likert scale and multiple variables

    Hi, I have a dataset of 100 survey responses. The survey asked respondents how frequently they engaged in certain leadership behaviours. There...

    Started by evegrace‎, 08-12-2016 09:04 AM
    • Replies: 1
    • Views: 1,213
    08-13-2016, 09:03 AM Go to last post
  32. Name That Model!

    Keywords: OLS, WLS, GLM, GzLM, Heteroscedasticity , Assumptions, Residuals, Errors Hullo I have been working full time and studying part time...

    Started by dj_johnphillips‎, 08-04-2016 02:33 PM
    • Replies: 7
    • Views: 1,950
    08-05-2016, 04:22 PM Go to last post
  33. Box's Test after outlier Removal

    Hello everyone, I have searched the forum and couldn't find an answer, so I figured I would start a new thread. I am running a 1-way MANOVA for...

    Started by dvtolusso‎, 08-02-2016 01:58 PM
    • Replies: 0
    • Views: 1,341
    08-02-2016, 01:58 PM Go to last post
  34. Question Is it right to estimate the mean of scores obtained from Factor Analysis?

    Hi Everyone :) I appreciate any comment about this question: Does it make sense to use the score obtained from a factor analysis to estimate the...

    Started by IsaMolly‎, 07-24-2016 09:48 PM
    • Replies: 6
    • Views: 2,043
    08-02-2016, 02:44 AM Go to last post
  35. Measuring effect - urgent

    Hi Guys, For my thesis, I am researching the influence of colour (IV) on product attractiveness (DV). Respondents in my experiment choose one of 7...

    Started by Jeroennn‎, 08-01-2016 04:38 AM
    • Replies: 8
    • Views: 1,993
    08-01-2016, 01:05 PM Go to last post
  36. Reporting effect size/post hocs when not significant- rigorous alpha

    Hello, I have received my manuscript back from reviewers who have suggested that I report Cohen's d for differences found between three groups. ...

    Started by emofield‎, 07-31-2016 09:22 PM
    • Replies: 1
    • Views: 1,200
    08-01-2016, 08:08 AM Go to last post
  37. Question Testing for trend in a r*c table, in STATA which method should I use?

    I have searched for multiple websites, and only found the information regarding how to test the trend in a 2*k table, which was not the exact...

    Started by belindalimm‎, 07-29-2016 02:04 PM
    • Replies: 0
    • Views: 930
    07-29-2016, 02:04 PM Go to last post
  38. Studies Quality Assesment: interpreted univariate analysis, adjusted for confounding?

    Hello, I am conducting a systematic review on mostly cohort studies. One part of my quality assessment is of course; if the observational study...

    Started by FlorenziH‎, 07-25-2016 08:35 AM
    systematic review
    • Replies: 0
    • Views: 998
    07-25-2016, 08:35 AM Go to last post
  39. Good sources (books, articles, ....) on the history of Monte Carlo methods?

    I am finally entering the final step of my PhD. Chapter 1 of my dissertation has already been published, Chapter 2 has been submitted for publication...

    Started by spunky‎, 07-21-2016 02:54 PM
    monte carlo, multivariate
    • Replies: 4
    • Views: 2,634
    07-22-2016, 05:38 AM Go to last post
  40. Bivariate Contour Ellipse Area

    I have found a research paper, where there is need to calculate the area of a bivariate contour ellipse. I am familiar with drawing a confidence...

    Started by m1chael‎, 07-21-2016 07:25 AM
    • Replies: 0
    • Views: 3,812
    07-21-2016, 07:25 AM Go to last post
  41. Correct statistical test to compare multiple rates

    Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the...

    Started by CE479‎, 07-20-2016 03:38 PM
    compare risk multiple
    • Replies: 0
    • Views: 1,055
    07-20-2016, 03:38 PM Go to last post
  42. Unbalanced samples

    Hi! I want to compare between two sample, but they have non equivalent means between demographic parameters such as age and more. What do you...

    Started by Hadar‎, 07-18-2016 06:21 AM
    • Replies: 1
    • Views: 1,443
    07-18-2016, 08:12 AM Go to last post
  43. Estimating the number of cases (sample size)

    Hi there! I've a perhaps simple question: how can I estimate the number of measurements (cases) to obtain a accurate result? Here an example:...

    Started by unknown‎, 07-17-2016 08:10 AM
    • Replies: 6
    • Views: 1,464
    07-17-2016, 11:00 PM Go to last post
  44. 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: 840
    07-17-2016, 10:44 AM Go to last post
  45. Repeated measures - Within/Between explained

    Hey guys, I'm having troubles understanding my analysis. I have patients going through pulmonary functions test every 2 weeks in 5 different time...

    Started by XPeriment‎, 06-24-2016 12:24 AM
    • Replies: 3
    • Views: 1,696
    07-16-2016, 08:58 AM Go to last post
  46. Dealing with missing values in cluster analysis

    I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

    Started by fabiangmueller‎, 07-15-2016 05:04 PM
    • Replies: 5
    • Views: 1,284
    07-16-2016, 06:53 AM Go to last post
  47. Bonferroni correction (significance level and CI)

    Hi there, I need another advice. I'm dealing with the problem of multiple testing and I was planning to use Bonferroni correction. Because I...

    Started by Jeremiah‎, 07-14-2016 05:38 AM
    • Replies: 1
    • Views: 2,176
    07-14-2016, 07:53 AM Go to last post
  48. 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: 1,620
    07-14-2016, 01:13 AM Go to last post
  49. What happens after Content Analysis and Cohen's Kappa?

    Hi I have 2 raters for content analysis and have a satisfactory score for Cohen's Kappa (0.805). Can I use either raters' values for analysis or...

    Started by MazOz‎, 07-13-2016 10:23 PM
    cohen's kappa, content analysis
    • Replies: 1
    • Views: 812
    07-14-2016, 01:09 AM Go to last post
  50. Re: what is the best test

    Dear all, I am analysing the data set with two independent variables (syntax, position), two levels each, affecting children's performance on the...

    Started by Eva Edel‎, 07-09-2016 05:45 PM
    • Replies: 1
    • Views: 1,016
    07-14-2016, 01:08 AM Go to last post
  51. Discrete or Continuous Data and Effect Size

    Dear All, I have a paper with baseline (expressed as median and IQR) and change scores at 12 months (mean, 95%CI) regarding the number of days per...

    Started by Pedro's PhD‎, 07-12-2016 02:47 PM
    • Replies: 0
    • Views: 1,116
    07-12-2016, 02:47 PM Go to last post
  52. what is the best test

    Hello! I'm not the best at statistics. I understand the theory but I am still uncertain about choosing the appropriate test. I am doing a study...

    Started by Soso13‎, 07-09-2016 01:28 PM
    • Replies: 1
    • Views: 1,375
    07-09-2016, 04:38 PM Go to last post
  53. Influence of a person in repeat measurement (multilevel) or longitudinal data

    Hey, I have a dataset of 50 people with 4 responses over the year. Responses were a 5-point Likert scale collapsed into a binary variable (0,1)....

    Started by hlsmith‎, 07-07-2016 09:47 AM
    • Replies: 3
    • Views: 1,165
    07-08-2016, 11:23 AM Go to last post
  54. Model vs. test

    Hi, we just had an interesting discussion about the chi-squared test, that could be generalized. I think the core of the discussion was whether one...

    Started by rogojel‎, 07-03-2016 02:23 AM
    regression model, statistical test
    • Replies: 1
    • Views: 1,123
    07-07-2016, 09:32 AM Go to last post
  55. Identifying the right way to establish correlations between different topics

    I have multiple topics each with hundreds of questions and different students submitting responses to these questions. What is the best way to...

    Started by sasank‎, 07-02-2016 03:56 AM
    • Replies: 0
    • Views: 908
    07-02-2016, 03:56 AM Go to last post
  56. Poisson process

    Dear statisticians, I have a question that is of great importance for my master thesis in insurance science. I have obtained a dataset that...

    Started by kulstudent‎, 07-01-2016 06:51 AM
    • Replies: 2
    • Views: 1,053
    07-01-2016, 02:08 PM Go to last post
  57. Question Which interrater reliability test to chose and how to set up the data matrix?

    I have a question regarding which interrater reliability test I should use. The situation is as follows: 12 judges rated 20 profiles with 14...

    Started by Maartenth‎, 07-01-2016 04:24 AM
    interrater reliability
    • Replies: 0
    • Views: 585
    07-01-2016, 04:24 AM Go to last post
  58. Analyzing Likert Scale Data Using Statistical Tools

    Hi everyone, I'm doing an MBA dissertation on the topic "Impact of Customer Service Satisfaction on Business Performance". The hypothesis set is...

    Started by Sahar04‎, 06-24-2016 05:22 AM
    • Replies: 3
    • Views: 1,742
    06-29-2016, 01:50 AM Go to last post
  59. Gamma distribution

    Hi, If I have three independent variables that all follow the gamma distribution, what distribution will then sum of these variables follow? ...

    Started by samot79‎, 06-28-2016 02:56 AM
    gamma distribution
    • Replies: 0
    • Views: 1,007
    06-28-2016, 02:56 AM Go to last post
  60. Unhappy How i can analyse two questionnaires to find the Reliability Coefficient

    I am working on a project in which i am comparing Public and Private schools performance for that I have to compare the data on SPSS to find the...

    Started by hafsa‎, 06-26-2016 04:35 PM
    • Replies: 0
    • Views: 1,812
    06-26-2016, 04:35 PM Go to last post

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