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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: 18,683
    10-11-2014, 12:02 PM Go to last post
  1. Exclamation Are scores significantly different to a neutral response? Please help...

    Hello I am working with a likert scale with response ranges from 1-5. A score of '3' indicates a neutral response. I want to calculate whether,...

    Started by gemma7‎, 10-05-2008 07:28 AM
    • Replies: 5
    • Views: 6,463
    10-06-2008, 07:40 PM Go to last post
  2. Are there any post hoc analyses for Chi Square data?

    Hi, I've got some Chi square results that I would like to analyze post hoc. Any ideas? I've got categorical data. Kind regards Brionny

    Started by Brionny‎, 03-08-2009 06:03 PM
    • Replies: 2
    • Views: 5,669
    03-10-2009, 04:57 PM Go to last post
  3. Are these dependent samples?

    Hello everyone, I have a dataset with 6,000 respondents. A regression analysis will be run on it. Then, I will break down the dataset into three...

    Started by Kabouterke‎, 05-29-2014 01:13 PM
    • Replies: 7
    • Views: 1,722
    06-05-2014, 06:46 AM Go to last post
  4. Are these group paired or unpaired?

    Iím a med student who hasnít had any form of math in the past 4 years, so bare with me. 90 % of words on this site dont mean anything to me, so it...

    Started by User‎, 06-26-2013 12:40 PM
    • Replies: 0
    • Views: 1,213
    06-26-2013, 12:40 PM Go to last post
  5. Question Are they misunderstanding ANOVAs here?

    Hi, Here's an extract from a paper I'm using in a systematic review: The mean GAD-7 score of the sample prior to the course was 10.98 (SD 5.17,...

    Started by fishfishfish3‎, 10-23-2014 11:56 AM
    anova, post hoc
    • Replies: 8
    • Views: 2,451
    10-24-2014, 11:22 AM Go to last post
  6. Are two distributions different? First dist.'s mean = 0 (none there, or low level)

    For the most part, when there are two distributions with continuous, positive means, it is straightforward to test if they are equal (t-test,...

    Started by massSpec‎, 01-24-2013 11:07 AM
    • Replies: 0
    • Views: 1,807
    01-24-2013, 11:07 AM Go to last post
  7. Article on logistic regression - don't understand logic of statement.

    The author Menard, has written a good deal on this topic and this is from a recent (2011) journal article. This makes sense. But I don't...

    Started by noetsi‎, 06-25-2013 01:54 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 3,500
    06-26-2013, 11:44 AM Go to last post
  8. As treated vs. per protocol?

    I have found articles saying the two are similar and cant make sense of it. Could anyone give me exact explanations of the two in lay terms and also...

    Started by Matt1147‎, 06-25-2013 03:21 PM
    • Replies: 2
    • Views: 3,957
    06-26-2013, 08:26 AM Go to last post
  9. Asking causal questions directly vs measuring variables in a survey

    Hi all, is it okay to ask causal questions like "Does A cause B?" directly as survey questions instead of asking question that measure A and B...

    Started by labrat‎, 09-18-2013 06:12 AM
    causal inference, experiment design, survey design
    • Replies: 4
    • Views: 2,183
    09-19-2013, 10:59 AM Go to last post
  10. 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: 2,649
    10-21-2016, 03:48 PM Go to last post
  11. Assessing quintile membership

    Hi, I'm conducting some research into income mobility. The simple model uses OLS to generate the elasticity of income with final earnings as the...

    Started by lmsava‎, 07-12-2011 03:44 PM
    • Replies: 0
    • Views: 1,520
    07-12-2011, 03:44 PM Go to last post
  12. Assistance in selecting an appropriate test (two groups, seven years, rating data)

    This is my very first post, and I have just about exhausted my understanding of Google, my textbooks, and existing forum searches. I am...

    Started by pcoraggi‎, 09-06-2015 04:17 PM
    • Replies: 1
    • Views: 1,725
    09-06-2015, 04:25 PM Go to last post
  13. Assistance with Comparing Two Months of Survey Data

    I'm probably making this harder than it is but I'll ask for opinions anyways. I'm trying to analyze two months of Yes/No survey data. Each month...

    Started by evo8cutie‎, 05-09-2011 08:46 PM
    • Replies: 1
    • Views: 1,952
    05-09-2011, 09:59 PM Go to last post
  14. Assistance with Statistical Methodology to address research problems

    Im looking for some help with a statistical method(s) that can support the research questions i am looking to answer. I am basically doing research...

    Started by blueshark12‎, 01-15-2013 03:24 PM
    methodology, parametric model, statistical research, utaut
    • Replies: 1
    • Views: 1,479
    01-15-2013, 04:08 PM Go to last post
  15. Question Association of demographic variables with the questionnaire,,27questions in likert sc

    hi, I am doing a research study to see the qualtiy of life of patients,so i am having a questionnaire which uses likeret scale to collect response...

    Started by Amit Barve‎, 12-08-2011 02:37 AM
    • Replies: 0
    • Views: 1,897
    12-08-2011, 02:37 AM Go to last post
  16. Assumed autocorrelation

    Hi all-- I apologize if this is an incredibly naive question, but I'm currently working with a signal and I need to find the "assumed lag-1...

    Started by beagle48‎, 10-27-2010 09:35 AM
    • Replies: 0
    • Views: 1,540
    10-27-2010, 09:35 AM Go to last post
  17. Assumption of variables for Factor Analysis

    Hi, In wikipedia page of Factor Analysis it states:Suppose we have a set of p observable random variables. Does it mean that we can use this method...

    Started by Fred_a‎, 01-13-2013 01:05 PM
    factor analysis, random variables
    • Replies: 2
    • Views: 1,389
    01-13-2013, 03:04 PM Go to last post
  18. Assumptions for an ARIMA(p, d, q) model (Box-Jenkins)

    I have a data set which is stationary but the histogram looks like a logaritmic distribution. Is this a problem? Is normality an assumption to use...

    Started by Fred_a‎, 02-18-2013 12:01 PM
    • Replies: 1
    • Views: 6,110
    02-18-2013, 12:52 PM Go to last post
  19. Assumptions for mix design anova with covariates

    Hello I Would like to nake a mix design (I HAVE TWO GROUPS -SICK AND HEALTHY), AND I made a cognitive measure of long / short exposure stimulus. ...

    Started by talgef‎, 12-26-2015 07:03 AM
    • Replies: 11
    • Views: 2,482
    01-01-2016, 01:36 PM Go to last post
  20. Poll Poll: Assumptions independent variables when just want to control/adjust for - less strict?

    Is it true that when one just want to control for/adjust for in linear og logistic regression models, the variables one wants to control for/adjust...

    Started by kristian‎, 03-02-2014 01:58 AM
    adjustment, confounders, control for, linear regression, logistic regression
    • Replies: 9
    • Views: 2,343
    03-08-2014, 05:48 AM Go to last post
  21. Assumptions of statistic models

    I was watching (https://www.youtube.com/watch?v=8SGif63VW6E) and he said a statement that made me think: 8SGif63VW6E#t=134 I asked for...

    Started by trinker‎, 11-07-2014 05:20 PM
    • Replies: 1
    • Views: 2,880
    11-07-2014, 06:34 PM Go to last post
  22. Question At Wits End

    Hi, I am doing a research report as a requirement for the course I am doing. Professor provided us with data and it's up to us to establish a...

    Started by statnewbie‎, 04-22-2011 11:45 PM
    • Replies: 2
    • Views: 2,080
    04-23-2011, 01:28 AM Go to last post
  23. Question attributes of individuals in discrete choice tasks

    Hello stat talkers, :wave: I'm currently working on a marketing (discrete choice) project concerning brand choice and I stumbled upon some questions...

    Started by alex.wendland‎, 11-16-2009 05:08 AM
    • Replies: 3
    • Views: 3,413
    11-23-2009, 04:23 AM Go to last post
  24. attrition: comparing *surviving* sample to original

    Hi, I have a question about attrition analyses in longitudinal databases. I know that I can compare the subjects who dropped out...

    Started by foreverpostdoc‎, 11-15-2006 11:45 AM
    • Replies: 4
    • Views: 2,996
    11-19-2006, 03:33 PM Go to last post
  25. Audit sample methodology question ... what do you call this?

    Hi there, This may be a method question rather than a stats one, but I'm hoping someone can help. Here's the situation in brief: I work in...

    Started by AndyB‎, 06-08-2011 02:22 AM
    • Replies: 0
    • Views: 2,104
    06-08-2011, 02:22 AM Go to last post
  26. Augment a sample to improve goodness-of-fit

    Hi all, Lets say I have a sample from a normal (or any other) distribution, and the goodness-of-fit is reasonable. It is possible to improve this...

    Started by alextb‎, 06-24-2013 05:05 AM
    • Replies: 0
    • Views: 1,422
    06-24-2013, 05:05 AM Go to last post
  27. Autocorrelated measurements with autocorrelated errors, covariance term

    Dear all interested stats people, I encountered the following situation for error propagation of a time series. 1.) Given a time series...

    Started by FrostR‎, 08-11-2012 07:43 AM
    • Replies: 0
    • Views: 1,494
    08-11-2012, 07:43 AM Go to last post
  28. Autocorrelation of panel data: need literature!

    I have (so-called) dynamical monte carlo model of a number of identical chains within simulation box And i've measured some data (like radius of...

    Started by icegood‎, 08-21-2012 06:13 AM
    • Replies: 2
    • Views: 1,841
    08-24-2012, 11:38 AM Go to last post
  29. Average effect size between factors and within an experimental condition

    Dear all, I am interested in an average effect size between heart rate and anxiety. Anxiety is separated in 2 factors (F1 and F2), and I would...

    Started by Stabilo‎, 10-16-2017 06:18 AM
    correlated correlations, effect size, meta analysis
    • Replies: 0
    • Views: 71
    10-16-2017, 06:18 AM Go to last post
  30. Average height of population

    I am trying to figure out how many samples to take from known population to be accurate within 95%. For example to find average height and...

    Started by mike121‎, 04-28-2016 08:56 PM
    • Replies: 0
    • Views: 782
    04-28-2016, 08:56 PM Go to last post
  31. Average minute rating can be modeled by poisson?

    Dear All, Here is my question with an example. I am trying to understand the tv channel rating data. The data measures the tv watchers...

    Started by masarimk‎, 11-28-2012 11:13 AM
    • Replies: 6
    • Views: 1,168
    11-28-2012, 11:57 AM Go to last post
  32. Average Replicates before Conducting an ANOVA?

    If there are multiple replicates of a trial condition, should they be averaged before conducting an ANOVA? For example, I am looking to measure...

    Started by sudds779‎, 04-02-2013 06:46 PM
    • Replies: 3
    • Views: 2,156
    04-03-2013, 12:49 PM Go to last post
  33. Averages of sales analysis

    Hi! I've conducted an experiment in a supermarket with music in which I had 3 situations: 1. No music 2. Soft music 3. Loud music I...

    Started by wytrych‎, 09-13-2013 03:15 PM
    anova, average, sales
    • Replies: 0
    • Views: 1,132
    09-13-2013, 03:15 PM Go to last post
  34. Balance in covariates in randomized trials

    Hi, I am new to this forum and have a question regarding randomized controlled trials (RCT). How can you mathematically/statistically derive that...

    Started by tompa‎, 11-05-2016 09:51 AM
    • Replies: 0
    • Views: 2,805
    11-05-2016, 09:51 AM Go to last post
  35. Balancing data

    A couple of classification (lets stick to only two groups for simplicity) models are performing better if we balance the data when there are few...

    Started by Englund‎, 05-01-2014 02:32 PM
    • Replies: 3
    • Views: 1,078
    05-02-2014, 01:18 PM Go to last post
  36. Bang and Tsiatis - t-test after?

    I have a treatment group and a control group (as a result of a matched cohort). I am comparing 12 month costs for a program but since not everyone...

    Started by lancearmstrong1313‎, 01-23-2015 01:24 PM
    • Replies: 2
    • Views: 1,369
    01-26-2015, 06:30 AM Go to last post
  37. Basic ANOVA question

    We had individuals fill out a survey where they assign importance to five categories. So for example: if given $1000 to distribute among five...

    Started by singerjr‎, 11-18-2014 09:05 AM
    • Replies: 6
    • Views: 2,198
    11-18-2014, 05:22 PM Go to last post
  38. Question basic hypothesis testing

    am new to the forum, and would appreciate some help. i'm studying the relationship between worker performance (x) and pay (y) i'm trying to...

    Started by rcreat‎, 03-17-2013 11:43 AM
    • Replies: 2
    • Views: 1,426
    03-17-2013, 01:49 PM Go to last post
  39. basic question about variance of categorical data

    So I have some data regarding items people have selected, and the people are separated into groups. I'm interested in whether or not one group has...

    Started by 80past2‎, 02-06-2012 03:31 PM
    • Replies: 1
    • Views: 2,176
    02-10-2012, 06:33 PM Go to last post
  40. Basic question on Spearman's correlation coefficient

    Hey guys, If I understand correctly, when calculating Spearman's correlation coefficient you just rank your variables, and then calculate...

    Started by Hombre‎, 02-24-2014 11:05 AM
    • Replies: 5
    • Views: 1,280
    02-24-2014, 01:37 PM Go to last post
  41. Basic Statistics Question

    I have a distribution and the numbers are spread around all over the place. For one sample of data it looks like left skewed and for other right...

    Started by sak‎, 10-08-2012 07:56 PM
    • Replies: 2
    • Views: 2,373
    10-08-2012, 08:29 PM Go to last post
  42. Basic stats research question

    Say that I have two collections of data. The first is a background collection, where I gather two sets of features f1_b: N1xd1, and f2_b: N1xd2. ...

    Started by ml_researcher‎, 09-04-2014 01:10 PM
    background probability
    • Replies: 0
    • Views: 1,366
    09-04-2014, 01:10 PM Go to last post
  43. Lightbulb Bayes Factors using BIC statistic (model selection)

    Hi, I need to compare four different models (logistic regression), model selection is performed using bayes factors using the BIC statisic. ...

    Started by Sophiie‎, 08-30-2013 02:32 PM
    bayesian, bic, logistic regression, model selection
    • Replies: 0
    • Views: 2,943
    08-30-2013, 02:32 PM Go to last post
  44. Bayes statistics - sensitivity to priors

    Hi, I came across a statement in a review of a research field, where they were determining an unknown parameter using Bayesian statistics. The...

    Started by rogojel‎, 06-19-2014 06:51 AM
    bayes, prior probabilities, sensitivity
    • Replies: 5
    • Views: 2,153
    06-22-2014, 01:53 AM Go to last post
  45. 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: 1,223
    03-11-2017, 10:46 AM Go to last post
  46. 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: 709
    09-01-2016, 02:19 AM Go to last post
  47. Bayesian approach to comparing parameters of two distributions

    This is my first post here, and I'm hoping that someone can help me with a stats problem. I don't have much formal training, but I'll do my best to...

    Started by zipp83‎, 05-09-2012 02:27 AM
    • Replies: 4
    • Views: 2,971
    05-09-2012, 02:20 PM Go to last post
  48. Bayesian confuson

    Hi, I am trying to reconcile what I think are conflicting philosophies in my head about an experiment. The experiment is a hierarchical model...

    Started by Panopticon‎, 04-29-2012 10:02 PM
    • Replies: 2
    • Views: 1,578
    04-29-2012, 10:30 PM Go to last post
  49. Bayesian inference with unequal sampling

    I have a "two-column" data set, with a multi-class categorical variable A, and two-class variable B. It is assumed that each observation is...

    Started by NaiveBayesian‎, 08-07-2015 08:15 AM
    bayesian, bayesian inference, sample size, sampling
    • Replies: 0
    • Views: 989
    08-07-2015, 08:15 AM Go to last post
  50. Bayesian inference, MAP and sampling (Gibbs)

    Hi all I'm applying bayes inference to a GMM, based on some data set. I'm using Gibbs sampling to get the "samples" from the posteriors (the mean's...

    Started by avima‎, 04-12-2011 11:53 AM
    • Replies: 6
    • Views: 4,923
    04-17-2011, 09:30 PM Go to last post
  51. Bayesian Logistic Regression

    I have the following logistic regression problem I am trying to solve using bayesian approach. " We consider a logistic regression setting where...

    Started by vioravis‎, 10-13-2008 03:09 PM
    • Replies: 0
    • Views: 3,138
    10-13-2008, 03:09 PM Go to last post
  52. Bayesian MCMC Fitting lognorm mixture model w/constraint on population mean

    I am trying to find a reference and/or guidance for fitting a mixture model to a population of data within an MCMC framwork where the global mean is...

    Started by mike-g2‎, 09-02-2015 12:37 PM
    bayesian, constrained, log-normal, mcmc, mixture-model
    • Replies: 0
    • Views: 1,195
    09-02-2015, 12:37 PM Go to last post
  53. Bayesian Me

    We had a (prior) hypothesis that these two binary groups were 30% different. So two categorical variables that are binary. We have the data and they...

    Started by hlsmith‎, 06-19-2015 03:54 PM
    • Replies: 0
    • Views: 1,247
    06-19-2015, 03:54 PM Go to last post
  54. Bayesian model - Prior - Sensitivity Analysis

    Hi, I'm looking for pointers(articles, papers etc) on sensitivity analysis on prior distributions in bayesian models. Could someone point me to...

    Started by panbalag‎, 01-23-2011 06:33 PM
    • Replies: 0
    • Views: 2,836
    01-23-2011, 06:33 PM Go to last post
  55. Bayesian model checking: a problem with Gelman's chi-squared test

    So, I foolishly tried to implement a test Gelman and his colleagues propose to determine whether observed data actually fits a model (Bayesian Data...

    Started by lostsoul‎, 09-09-2012 12:06 PM
    bayesian, gelman, model checking, test statistic
    • Replies: 2
    • Views: 2,652
    09-11-2012, 09:21 PM Go to last post
  56. Bayesian Modeling Question


    Started by bayesianman‎, 02-07-2013 10:55 PM
    • Replies: 3
    • Views: 1,381
    02-07-2013, 11:44 PM Go to last post
  57. Question Bayesian parameter estimation via MCMC?

    Hi folks. I have the following question. I have a model M containing 20 adjustable parameters k = {k_j}. I also have 40-50 measured...

    Started by witziger_Fuchs‎, 12-15-2015 08:49 AM
    • Replies: 2
    • Views: 1,735
    12-26-2015, 02:34 AM Go to last post
  58. Bayesian point hypothesis testing for contigency table

    Hi everyone, I've been using bayesian hypothesis testing to compare a 2x2 table using the example that can be found on this book:...

    Started by micdhack‎, 03-29-2012 10:09 AM
    • Replies: 1
    • Views: 1,465
    03-31-2012, 08:34 AM Go to last post
  59. Bayesian Statistics

    Hello I need an example, as simple as possible to Bayesian analysis. I was thinking about a simple proportion problem, perhaps with a credibility...

    Started by NN_STAT‎, 07-09-2012 03:59 AM
    • Replies: 3
    • Views: 2,067
    08-25-2012, 07:14 PM Go to last post
  60. Bayesian t-test

    Hello I tried looking for a simple explanation with an example of how to perform a procedure that will be equivalent to the t-test using Bayesian...

    Started by NN_STAT‎, 05-08-2012 02:07 AM
    • Replies: 4
    • Views: 4,155
    05-11-2012, 06:11 AM Go to last post

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