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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 03:56 AM
    • Replies: 14
    • Views: 7,216
    10-11-2014, 12:02 PM Go to last post
  1. Machine Learning Out Predicting ESPN?

    The Amos model over takes ESPN's FPI? Check it out and Week 4 picks http://trevorbischoff.com/amos-2016-nfl-predictor/

    Started by LeeBalto‎, 09-28-2016 12:36 PM
    • Replies: 0
    • Views: 107
    09-28-2016, 12:36 PM Go to last post
  2. Heckman regression models

    I am using a 2step heckman regression model and I want to evaluate that probit looks okay and that the model converges and that there are no "red"...

    Started by micdhack‎, 09-26-2016 11:37 AM
    • Replies: 2
    • Views: 125
    09-26-2016, 03:27 PM Go to last post
  3. Testing if the volatility of single stocks and/or indices have risen in the past.

    Hey Guys, I'm an economics and business student from Basel(Switzerland), and I'm currently writing my bachelor thesis in "Corporate Financial...

    Started by RazorLazor‎, 09-26-2016 12:12 PM
    • Replies: 0
    • Views: 79
    09-26-2016, 12:12 PM Go to last post
  4. Comparing Proportions with difference numbers of events

    So, I'm interested in examining prey preference of a predator and one of the metrics I am interested in rejection rates for attack. I have 1 hour...

    Started by nebulus‎, 09-21-2016 04:54 PM
    • Replies: 0
    • Views: 162
    09-21-2016, 04:54 PM Go to last post
  5. Comparing the output of JAGS to conjugate analysis - normal with unknown mean and var

    Dear Bayesians. I'm starting my way in the Bayesian world, and I'm trying to build a simple model for estimating the mean and variance of a normal...

    Started by idif‎, 09-20-2016 09:02 AM
    bayesian, conjugate, jags, mcmc
    • Replies: 0
    • Views: 143
    09-20-2016, 09:02 AM Go to last post
  6. 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: 272
    09-18-2016, 09:24 AM Go to last post
  7. 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: 197
    09-14-2016, 04:01 PM Go to last post
  8. 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: 123
    09-13-2016, 03:07 AM Go to last post
  9. 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: 165
    09-12-2016, 04:59 AM Go to last post
  10. 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: 85
    09-12-2016, 04:21 AM Go to last post
  11. 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: 178
    09-12-2016, 03:26 AM Go to last post
  12. 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: 154
    09-09-2016, 03:33 AM Go to last post
  13. 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: 232
    09-08-2016, 12:28 PM Go to last post
  14. 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: 124
    09-08-2016, 12:25 AM Go to last post
  15. [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: 124
    09-07-2016, 09:09 AM Go to last post
  16. 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: 652
    09-06-2016, 03:43 PM Go to last post
  17. 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: 379
    09-05-2016, 09:04 AM Go to last post
  18. 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: 197
    09-03-2016, 08:47 AM Go to last post
  19. 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: 113
    09-01-2016, 02:19 AM Go to last post
  20. 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: 99
    08-30-2016, 12:28 PM Go to last post
  21. 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: 91
    08-29-2016, 11:28 PM Go to last post
  22. 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: 212
    08-29-2016, 07:21 PM Go to last post
  23. 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: 208
    08-29-2016, 03:12 AM Go to last post
  24. 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: 201
    08-28-2016, 07:31 PM Go to last post
  25. 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: 523
    08-27-2016, 01:11 PM Go to last post
  26. 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: 192
    08-26-2016, 06:55 PM Go to last post
  27. 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: 180
    08-26-2016, 06:44 AM Go to last post
  28. 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: 169
    08-25-2016, 11:00 PM Go to last post
  29. 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: 132
    08-25-2016, 10:31 AM Go to last post
  30. 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: 238
    08-24-2016, 11:08 AM Go to last post
  31. 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: 133
    08-21-2016, 09:37 PM Go to last post
  32. 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: 106
    08-21-2016, 05:47 PM Go to last post
  33. 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: 213
    08-16-2016, 08:22 PM Go to last post
  34. 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: 156
    08-15-2016, 12:58 PM Go to last post
  35. 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: 154
    08-14-2016, 08:52 PM Go to last post
  36. 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: 234
    08-13-2016, 09:03 AM Go to last post
  37. 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: 438
    08-05-2016, 04:22 PM Go to last post
  38. 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: 321
    08-02-2016, 01:58 PM Go to last post
  39. 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: 602
    08-02-2016, 02:44 AM Go to last post
  40. 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: 253
    08-01-2016, 01:05 PM Go to last post
  41. 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: 181
    08-01-2016, 08:08 AM Go to last post
  42. 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: 200
    07-29-2016, 02:04 PM Go to last post
  43. 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: 213
    07-25-2016, 08:35 AM Go to last post
  44. 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: 372
    07-22-2016, 05:38 AM Go to last post
  45. 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: 255
    07-21-2016, 07:25 AM Go to last post
  46. 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: 187
    07-20-2016, 03:38 PM Go to last post
  47. 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: 240
    07-18-2016, 08:12 AM Go to last post
  48. 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: 290
    07-17-2016, 11:00 PM Go to last post
  49. 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: 161
    07-17-2016, 10:44 AM Go to last post
  50. 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: 357
    07-16-2016, 08:58 AM Go to last post
  51. 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: 314
    07-16-2016, 06:53 AM Go to last post
  52. 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: 266
    07-14-2016, 07:53 AM Go to last post
  53. 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: 343
    07-14-2016, 01:13 AM Go to last post
  54. 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: 180
    07-14-2016, 01:09 AM Go to last post
  55. 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: 217
    07-14-2016, 01:08 AM Go to last post
  56. 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: 193
    07-12-2016, 02:47 PM Go to last post
  57. 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: 305
    07-09-2016, 04:38 PM Go to last post
  58. 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: 337
    07-08-2016, 11:23 AM Go to last post
  59. 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: 320
    07-07-2016, 09:32 AM Go to last post
  60. 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: 219
    07-02-2016, 03:56 AM Go to last post

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