1. 10-14-2010
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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: 7,482
    10-11-2014, 12:02 PM Go to last post
  1. Two mediators (serial mediation)

    Dear all, I am writing my master thesis and really need help with one issue. I am investigating the following serial mediation (so 2 mediators...

    Started by StatHanna‎, Yesterday 11:53 AM
    • Replies: 0
    • Views: 59
    Yesterday, 11:53 AM Go to last post
  2. Repeated measures with different cohorts

    Dear all, I have data from 3 different art groups (orchestra, dance, musical theatre) collected in 3 different times of measure. Data is...

    Started by Subcora‎, Yesterday 06:36 AM
    cohort, repeated measures
    • Replies: 0
    • Views: 58
    Yesterday, 06:36 AM Go to last post
  3. Applicability of Bayes to Contingency Tables (Chi-Squared)

    Is it possible to apply the Bayes factor to tests of/for independence/homogeneity (Chi-Square)? You can find a file below. The contingency table...

    Started by trulu‎, 10-05-2016 05:26 AM
    • Replies: 1
    • Views: 257
    10-25-2016, 08:18 AM Go to last post
  4. Relationship between actual and expected

    Hi, I am trying to illustrate relationship between expected and observed occurrences for my variable X. Outcomes for my variable vary between 0-5...

    Started by samot79‎, 10-24-2016 06:46 AM
    • Replies: 0
    • Views: 105
    10-24-2016, 06:46 AM Go to last post
  5. Assessing mediation with lagged predictors

    Hello dear forum members! I am seeking your comments/advises on the following question related to assessing mediation effects. Following the...

    Started by kiton‎, 10-21-2016 11:08 AM
    lagged effects, mediation analysis, methodology, sobel test
    • Replies: 1
    • Views: 151
    10-21-2016, 03:48 PM Go to last post
  6. Regression for multiple scores obtained from multiple subjects

    Hello, I have preference ratings (1-to-7 scale) for k=80 stimuli, obtained from N=30 subjects. I would like to do a multiple regression for these...

    Started by wildetudor‎, 10-21-2016 03:38 AM
    matlab, multiple regression, regression, repeated measures
    • Replies: 0
    • Views: 89
    10-21-2016, 03:38 AM Go to last post
  7. The effect of a single continuous IV on within subjects change

    Could someone please suggest the most appropriate method of analysis to examine the effect of a continuous IV on a within subject (repeated measures)...

    Started by vivienf‎, 10-20-2016 08:33 PM
    change, mixed anova, repeated measure, within-subjects
    • Replies: 0
    • Views: 62
    10-20-2016, 08:33 PM Go to last post
  8. trend or forecast

    I have done some research related to computer users and files generating pattern on PC. I collected data from PC where I have information when (date)...

    Started by explorer‎, 10-20-2016 06:37 AM
    data set, prediction model, trend detection
    • Replies: 0
    • Views: 102
    10-20-2016, 06:37 AM Go to last post
  9. Why "controlling for X" studies may be fatally flawed

    I came across this paper this week, which was quite an eye-opener for me, so I wanted to share. We are probably all familiar with "controlling for...

    Started by Junes‎, 10-19-2016 05:51 PM
    • Replies: 3
    • Views: 115
    10-19-2016, 06:45 PM Go to last post
  10. Paper Survey for (Statistical) Function Modelling

    Hi! I'm surveying some papers for different kinds of approaches for (statistical) function modelling. Suppose (x_1,...,x_n) is one of multiple...

    Started by VincentJYTsai‎, 10-19-2016 09:38 AM
    • Replies: 0
    • Views: 104
    10-19-2016, 09:38 AM Go to last post
  11. Please help, parametric or non-parametric test?

    I have a data set of 58 records containing students, gender, total sat score and sat score for each part. 40% of the records are Male, 60% female ...

    Started by kdsan‎, 10-16-2016 12:13 PM
    • Replies: 0
    • Views: 159
    10-16-2016, 12:13 PM Go to last post
  12. Need help- finding the right test

    Hello, I need to compare three indices that were measured at a few different sites, which means I can't use their actual values because they are...

    Started by Royan‎, 10-16-2016 02:45 AM
    • Replies: 0
    • Views: 126
    10-16-2016, 02:45 AM Go to last post
  13. Sample Size Calculation (HELP!)

    Hi all, I wish someone could help me out. I am trying to estimate the sample size for a national health survey. From the previous report,...

    Started by chummsy‎, 10-12-2016 08:29 PM
    • Replies: 1
    • Views: 175
    10-15-2016, 09:44 AM Go to last post
  14. Testing for difference between locations of two variables using longitude and latitud

    Hello, Hypothesis: there is a correlation between instances of violent conflict and mining concessions in the DRC. I have data sets of both...

    Started by jonathan.rothwell39‎, 10-11-2016 06:40 AM
    • Replies: 1
    • Views: 207
    10-11-2016, 08:08 AM Go to last post
  15. Unhappy How to merge two data sets with varying date intervals?

    I'm sure this problem isn't unique. I have two sets of data, both $ values and I want to add them together and plot them on a chart. The problem...

    Started by tomydom‎, 10-07-2016 01:12 AM
    bootstrap, data set, merged data
    • Replies: 3
    • Views: 270
    10-09-2016, 07:21 AM Go to last post
  16. Lightbulb test for compariing pre- post test on same anonymized participants

    I am conducting a research to study the change in business skills, and attitude towards self employment after a compulsory intervention program for...

    Started by Husssy‎, 10-03-2016 07:20 PM
    • Replies: 0
    • Views: 190
    10-03-2016, 07:20 PM Go to last post
  17. Variance Inflation Factor

    Hej, I am checking for multicollinearity. And I cant find on the web when having the outpur from R commander, on which I have to look to identify...

    Started by MasterStudent‎, 03-10-2016 07:03 AM
    • Replies: 10
    • Views: 881
    10-02-2016, 06:38 PM Go to last post
  18. 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: 203
    09-28-2016, 12:36 PM Go to last post
  19. 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: 186
    09-26-2016, 03:27 PM Go to last post
  20. 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: 142
    09-26-2016, 12:12 PM Go to last post
  21. 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: 230
    09-21-2016, 04:54 PM Go to last post
  22. 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: 192
    09-20-2016, 09:02 AM Go to last post
  23. 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: 327
    09-18-2016, 09:24 AM Go to last post
  24. 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: 272
    09-14-2016, 04:01 PM Go to last post
  25. 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: 169
    09-13-2016, 03:07 AM Go to last post
  26. 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: 223
    09-12-2016, 04:59 AM Go to last post
  27. 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: 125
    09-12-2016, 04:21 AM Go to last post
  28. 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: 231
    09-12-2016, 03:26 AM Go to last post
  29. 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: 194
    09-09-2016, 03:33 AM Go to last post
  30. 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: 291
    09-08-2016, 12:28 PM Go to last post
  31. 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: 163
    09-08-2016, 12:25 AM Go to last post
  32. [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: 185
    09-07-2016, 09:09 AM Go to last post
  33. 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: 763
    09-06-2016, 03:43 PM Go to last post
  34. 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: 431
    09-05-2016, 09:04 AM Go to last post
  35. 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: 252
    09-03-2016, 08:47 AM Go to last post
  36. 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: 146
    09-01-2016, 02:19 AM Go to last post
  37. 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: 130
    08-30-2016, 12:28 PM Go to last post
  38. 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: 118
    08-29-2016, 11:28 PM Go to last post
  39. 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: 252
    08-29-2016, 07:21 PM Go to last post
  40. 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: 240
    08-29-2016, 03:12 AM Go to last post
  41. 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: 249
    08-28-2016, 07:31 PM Go to last post
  42. 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: 594
    08-27-2016, 01:11 PM Go to last post
  43. 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: 235
    08-26-2016, 06:55 PM Go to last post
  44. 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: 220
    08-26-2016, 06:44 AM Go to last post
  45. 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: 216
    08-25-2016, 11:00 PM Go to last post
  46. 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: 168
    08-25-2016, 10:31 AM Go to last post
  47. 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: 285
    08-24-2016, 11:08 AM Go to last post
  48. 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: 159
    08-21-2016, 09:37 PM Go to last post
  49. 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: 133
    08-21-2016, 05:47 PM Go to last post
  50. 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: 246
    08-16-2016, 08:22 PM Go to last post
  51. 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: 190
    08-15-2016, 12:58 PM Go to last post
  52. 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: 195
    08-14-2016, 08:52 PM Go to last post
  53. 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: 282
    08-13-2016, 09:03 AM Go to last post
  54. 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: 500
    08-05-2016, 04:22 PM Go to last post
  55. 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: 371
    08-02-2016, 01:58 PM Go to last post
  56. 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: 707
    08-02-2016, 02:44 AM Go to last post
  57. 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: 330
    08-01-2016, 01:05 PM Go to last post
  58. 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: 224
    08-01-2016, 08:08 AM Go to last post
  59. 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: 250
    07-29-2016, 02:04 PM Go to last post
  60. 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: 247
    07-25-2016, 08:35 AM Go to last post

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