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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: 3,103
    10-11-2014, 12:02 PM Go to last post
  1. Addressing omitted variable bias in count panel model

    Hello dear forum members, My study aims to address the question about physician ratings: Do they have an impact on the business value (as proxied...

    Started by kiton‎, Today 01:04 AM
    count data, negative binomial, panel data
    • Replies: 0
    • Views: 54
    Today, 01:04 AM Go to last post
  2. Computing ICCs

    Hi everyone, Have run into a problem that has me absolutely stumped and would appreciate some assistance. I'm attempting to compute the ICC from...

    Started by jnian‎, Yesterday 03:36 PM
    • Replies: 0
    • Views: 69
    Yesterday, 03:36 PM Go to last post
  3. chi-square test of independence sig but all post-hoc not--how to report?

    I am conducting chi-square tests of independence and for any that are significant I am conducting Bonferroni adjusted post-hoc tests. I have a couple...

    Started by m.hawkins‎, 06-26-2015 01:19 PM
    chi-square, post-hoc, reporting results
    • Replies: 1
    • Views: 121
    06-26-2015, 01:22 PM Go to last post
  4. help with fit and normal distribution

    I have a set of data comparing age to a value. I was looking for help on assessing fit. I was also looking for the ability to analyze the normative...

    Started by mdnelson‎, 06-23-2015 09:24 PM
    • Replies: 0
    • Views: 212
    06-23-2015, 09:24 PM Go to last post
  5. help with Normality test?

    Hi all! this is probably a simple question; however, my statistics skills got a bit rusty and I cannot find an appropriate solution on the...

    Started by nicola‎, 06-16-2015 05:04 PM
    normality test
    • Replies: 11
    • Views: 320
    06-23-2015, 03:51 PM Go to last post
  6. General vs Generalized Linear Models

    While defending my thesis yesterday, this difference was pointed out. Surprised that there was actually a difference I wasn't aware of, I've looked...

    Started by Link‎, 03-09-2011 12:51 PM
    • Replies: 12
    • Views: 8,343
    06-23-2015, 12:52 PM Go to last post
  7. what is the difference between latent class analysis and factor analysis?

    I read some papers and most of them used EFA/SEM, and one paper used LCA (latent class analysis). So, when do you need to use LCA but not FA? It...

    Started by fengyuwuzu‎, 06-22-2015 02:49 PM
    • Replies: 2
    • Views: 128
    06-22-2015, 05:04 PM Go to last post
  8. Factor Analysis or Something Else

    Hey guys, So I was a little uncertain about where to best post this, so I apologize if this is in the wrong place, but I had a statistical...

    Started by jm65701‎, 06-19-2015 11:10 PM
    • Replies: 4
    • Views: 220
    06-22-2015, 07:27 AM Go to last post
  9. quality control project material

    I seriously need project materials on qualiy control topics..........hammedy70@gmail.com please

    Started by shamack‎, 06-22-2015 06:44 AM
    • Replies: 0
    • Views: 63
    06-22-2015, 06:44 AM Go to last post
  10. Interrater reliability

    I have recently posted a question but I might have made it too complicated to gain any response. I try to simplify my question and hopefully I can...

    Started by urielbrian‎, 06-22-2015 02:27 AM
    • Replies: 0
    • Views: 91
    06-22-2015, 02:27 AM Go to last post
  11. Exclamation Help needed to check statistics in thesis

    I would really need someone to check my stats work for my thesis, as I am not entirely sure about what procedures I carried out. Quick overview of...

    Started by fran93‎, 06-20-2015 10:02 AM
    anova, experiment, likert items, statistics, t-test
    • Replies: 0
    • Views: 160
    06-20-2015, 10:02 AM Go to last post
  12. Exploratory Factor Analysis with Ordinal Data

    Hi folks, I am in the midst of absorbing as much information on exploratory factor analysis as I can. I studied this method once before but not to...

    Started by DRMORRIS‎, 06-18-2015 03:35 PM
    • Replies: 2
    • Views: 143
    06-19-2015, 04:10 PM Go to last post
  13. 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: 99
    06-19-2015, 03:54 PM Go to last post
  14. Can we have a Logit that punishes some missclassifications more harhsly than others ?

    Suppose I wish to estimate a logit model to predict Large losses when trading stocks, well I might say y_t = 1 if that trade was a large loss. But...

    Started by thedreamshaper‎, 06-19-2015 04:38 AM
    logit
    • Replies: 4
    • Views: 155
    06-19-2015, 07:06 AM Go to last post
  15. Calculate Market Share (Lender Reputation)

    Hi All, I urgently need for help regarding a research I am currently doing. I have a panel data set of syndicated loan transactions...

    Started by Tomas1990‎, 06-19-2015 03:54 AM
    • Replies: 0
    • Views: 55
    06-19-2015, 03:54 AM Go to last post
  16. Need your help on my research study!

    Hi everyone! I am am currently having a qualitative study and have finished conducting interviews with participants. Despite qualitative in nature,...

    Started by urielbrian‎, 06-18-2015 01:40 PM
    • Replies: 0
    • Views: 57
    06-18-2015, 01:40 PM Go to last post
  17. GIS data questions

    Hi All, I have to get some GIS data for a project I am working on but I honestly have no idea where to start. What I need is as follows: 1. I...

    Started by Lazar‎, 06-17-2015 08:09 PM
    gis
    • Replies: 5
    • Views: 205
    06-18-2015, 11:21 AM Go to last post
  18. Graphical Method of Testing Cox Regression Model Fit

    Hi all, Since my last post you'll be happy to know i have successfully built a couple of what appear to be reasonable proportional hazard models...

    Started by Cope_LA2‎, 06-17-2015 10:58 AM
    • Replies: 0
    • Views: 78
    06-17-2015, 10:58 AM Go to last post
  19. Predictive model for Turnover - Correlation or Survival Analysis

    Question 1 - I a working on developing a model to predict employee turnover. The variables that I have are age, tenure, job satisfaction, role...

    Started by srivabs‎, 06-17-2015 01:57 AM
    correlation, prediction model, survival analysis
    • Replies: 4
    • Views: 156
    06-17-2015, 10:49 AM Go to last post
  20. HLM Graphics

    Hi Guys, i am working with hlm 7 and a 3-level-Model. I analyse if Extraversion is a Moderator between Event Leader/employe (for example positive...

    Started by gl4diator‎, 06-13-2015 09:32 AM
    • Replies: 0
    • Views: 212
    06-13-2015, 09:32 AM Go to last post
  21. Sample size in equivalence trial?

    Hey all, For my thesis I need to calculate the sample size for an equivalence trial with four groups (the score on four equivalent forms in order...

    Started by merisslian‎, 06-12-2015 06:10 AM
    anova, equivalence, equivalence trial, sample size
    • Replies: 3
    • Views: 177
    06-12-2015, 10:21 AM Go to last post
  22. Talking Suitable Model

    Hi all, I wonder if anyone could help me, i'm looking for an idea or two :) I work in the financial sector and we are looking into ways of...

    Started by Cope_LA2‎, 06-11-2015 09:46 AM
    finance, logistic, model, problem
    • Replies: 2
    • Views: 130
    06-12-2015, 02:44 AM Go to last post
  23. How to address the problem of "censorship" in star ratings?

    Hello dear forum members, I am conducting a study exploring the relationship between online review-based ratings (min 1, max 5) and doctors'...

    Started by kiton‎, 06-11-2015 10:30 AM
    • Replies: 2
    • Views: 160
    06-11-2015, 03:07 PM Go to last post
  24. Logistic or OLS Regression?

    I am new to statistics and learning a bit about regression and logistic "regression." The dependent variable for my data set is whether a sports...

    Started by WC4J‎, 06-10-2015 11:36 AM
    • Replies: 3
    • Views: 147
    06-11-2015, 09:07 AM Go to last post
  25. beating the rules at discrete sampling

    hi, I am looking at the question of how to sample rare occurances, like a rare defect in a manufacturing line. If I use the standard sample size...

    Started by rogojel‎, 06-10-2015 01:32 PM
    discrete data, proportions sample size
    • Replies: 4
    • Views: 182
    06-11-2015, 02:42 AM Go to last post
  26. Interaction effects in Fixed Effect Models

    Dear all, I am currently writing my Master thesis and in addition to finding a relationship, I examine whether the relationship between X and Y...

    Started by MarkieMark‎, 06-10-2015 02:23 AM
    fixed effect model, interaction effect
    • Replies: 1
    • Views: 104
    06-10-2015, 05:34 AM Go to last post
  27. Issue in Interpreting SPSS output of GLM repeated measures

    I have a data set with repeated measures for each individual. That is there a re two groups, treatment and control. And each individual is measured...

    Started by Clarkson‎, 06-10-2015 01:43 AM
    glm-anova, repeated measures, spss
    • Replies: 0
    • Views: 75
    06-10-2015, 01:43 AM Go to last post
  28. Statistics For Recruitment

    Hi, I'm new here so sorry if I'm posting in the wrong section. I'm trying to figure out the best way to use statistics to estimate potential in...

    Started by PT95‎, 06-08-2015 08:10 PM
    • Replies: 0
    • Views: 198
    06-08-2015, 08:10 PM Go to last post
  29. Question Test of Facebook Advertising data

    Dear board members, I have conducted a field experiment using Facebook ads. Now that the experiment has nearly come to its end, I have started to...

    Started by NNo‎, 06-08-2015 05:20 PM
    • Replies: 0
    • Views: 161
    06-08-2015, 05:20 PM Go to last post
  30. Why does anyone bother to post questions here?

    A very large number have no answers. What's the point?

    Started by hcc‎, 06-02-2015 11:52 PM
    2 Pages
    1 2
    • Replies: 28
    • Views: 952
    06-05-2015, 05:18 AM Go to last post
  31. Does autocorrelation in data affect (simple) correlation measures?

    Hello everyone, I have a question concerning autocorrelation in data affecting correlation coefficients. I have a time series of stock returns...

    Started by samf‎, 06-04-2015 10:35 AM
    • Replies: 0
    • Views: 128
    06-04-2015, 10:35 AM Go to last post
  32. Help on which test to choose for paired samples?

    Hi there - I'm hoping to elicit help on which test to choose - Mann-Whitney vs Wilcoxin (signed rank or rank-sum)? I have paired water samples...

    Started by dougherl‎, 06-02-2015 08:31 PM
    • Replies: 2
    • Views: 175
    06-03-2015, 07:33 AM Go to last post
  33. Research Project Pseudoreplication Problem

    Hello, I posted a few weeks ago but some new problems have come up and I could really use some advice! I am joining in on a research project in...

    Started by nikhil‎, 06-02-2015 06:24 PM
    • Replies: 1
    • Views: 174
    06-03-2015, 03:12 AM Go to last post
  34. Interpreting pairwise comparisons for significance when you have 3 groups

    Dear posters, I am currently trying to interpret results from three different groups in my study. There is essentially a control group and two...

    Started by kramonda‎, 06-01-2015 02:26 AM
    comparison, pairwise, post hoc test, significance
    • Replies: 2
    • Views: 213
    06-02-2015, 01:30 AM Go to last post
  35. Repeated measures analysis for Non-parametric data

    Hi everyone, I have a dataset that looks something like this: Patient.....Group.............Score_day1......Score_day2.....Score_day3...

    Started by anchms09‎, 01-26-2011 04:51 PM
    • Replies: 1
    • Views: 2,305
    06-01-2015, 05:18 AM Go to last post
  36. Large differences in Pearson vs Spearman

    Dear all, My name is Mark and I am currently writing my thesis for a Master in Economics. I examine whether year to year changes in certain...

    Started by MarkieMark‎, 06-01-2015 02:30 AM
    • Replies: 4
    • Views: 161
    06-01-2015, 03:11 AM Go to last post
  37. F statistic values more than 1000 (sample like 2000 and 5000 )

    I am studying the water parameters from three different groups. I performed ANOVA and found for few parameters F value was way high to report. I...

    Started by mnvanil‎, 05-30-2015 06:01 AM
    anova assumption, anova observations, f statistics
    • Replies: 1
    • Views: 260
    05-31-2015, 07:28 AM Go to last post
  38. Multivariate analysis - help

    Hi, I'm looking at place of death in a group of people, I have information on where they died, what they died of, their ethnicity, the area of...

    Started by tje257‎, 05-28-2010 05:02 AM
    • Replies: 4
    • Views: 1,599
    05-30-2015, 05:37 AM Go to last post
  39. Question Is regrouping allowed here (ANOVA)?

    Dear community We measured the relative area of a protein (area protein/area tissue) in different compartments (ROI.name) of a tissue piece (see...

    Started by Koen2704‎, 05-29-2015 04:15 AM
    • Replies: 1
    • Views: 177
    05-29-2015, 06:47 AM Go to last post
  40. Correction for multiple testing or not?

    Hi all. I hope you can help me out! I have performed two microarray analyses: 1. Effect of knockdown of gene A on global gene expression levels...

    Started by tuur‎, 05-29-2015 04:15 AM
    • Replies: 0
    • Views: 124
    05-29-2015, 04:15 AM Go to last post
  41. Monte-Carlo simulation of repeated-measures ANOVA

    Hello, I want to conduct a Monte-Carlo simulation of a repeated-measures ANOVA. The random numbers used for the simulation need to have specified...

    Started by Kes‎, 05-28-2015 05:07 AM
    anova, monte carlo, repeated measures
    • Replies: 0
    • Views: 180
    05-28-2015, 05:07 AM Go to last post
  42. Is ANOVA biased compared to ANCOVA?

    Can we consider ANOVA is biased compared to ANOCOVA despite that the normality is still maintained in ANOVA?

    Started by isaacadel‎, 05-23-2015 10:26 AM
    • Replies: 1
    • Views: 287
    05-26-2015, 11:54 PM Go to last post
  43. 2 or 3 way ANOVA?

    Hi I'm not sure whether to use a 2 or 3 way ANOVA. My project I'm working on is focussing on one antibiotic and seeing how toxic it is at...

    Started by alanie‎, 05-25-2015 09:33 AM
    anova
    • Replies: 1
    • Views: 257
    05-26-2015, 07:04 AM Go to last post
  44. Spearman’s rho & the uncountability of the Real Numbers

    I’m working on the write-up to transform my comprehensive exam on the Spearman rank correlation into a publishable article and would like to gather...

    Started by spunky‎, 05-25-2015 04:40 PM
    • Replies: 0
    • Views: 239
    05-25-2015, 04:40 PM Go to last post
  45. Business location statistics.

    I'm interested in researching business statistics and possible factors involved which will determine a good business location. For example, If I am...

    Started by britishchick‎, 05-23-2015 04:11 AM
    • Replies: 0
    • Views: 166
    05-23-2015, 04:11 AM Go to last post
  46. How to calculate significant differences in correlation using stata/spss

    Hello, This is probably a fairly simple question but I don't know to handle it properly. I have monthly data of 2 categories. Each category...

    Started by daydreamer‎, 05-22-2015 11:53 AM
    • Replies: 1
    • Views: 197
    05-23-2015, 03:47 AM Go to last post
  47. Question Mixed model with time-varying covariate - are correlations between covariates bad?

    Hi everyone, I have a question regarding the correlation between predictors in a model, and whether I should worry about it in my specific case....

    Started by Lara333‎, 05-22-2015 09:13 AM
    mixed, repeated-measures, time-varying covariate
    • Replies: 0
    • Views: 155
    05-22-2015, 09:13 AM Go to last post
  48. Can I use Partial Eta Squared for t-tests?

    Hi, I am currently trying to decide which effect size is the most appropriate for my results. I have conducted a repeated measures ANOVA, there...

    Started by heather88‎, 05-22-2015 05:47 AM
    effect size., partial eta squared, t-tests
    • Replies: 0
    • Views: 139
    05-22-2015, 05:47 AM Go to last post
  49. Red face Cramer's V

    Hi all, Just have a question about Cramer's V. I'm doing some analysis on education levels of partners; male partners vs. female partners. In the...

    Started by AvMac‎, 05-20-2015 08:58 PM
    cramer's v
    • Replies: 2
    • Views: 219
    05-21-2015, 09:05 PM Go to last post
  50. Question regarding which ANOVA to use

    I am working on a research project involving heavy metal accumulation in mussels. I am examining both spatial and temporal trends at 3 different...

    Started by nikhil‎, 05-21-2015 01:22 PM
    • Replies: 1
    • Views: 178
    05-21-2015, 02:21 PM Go to last post
  51. small sample size

    hi everybody. i need your help urgently... in my resource i need to measure a distribution for a Certain metal property (microscopic property)....

    Started by adam2649‎, 05-19-2015 01:02 AM
    • Replies: 0
    • Views: 207
    05-19-2015, 01:02 AM Go to last post
  52. geometric argument for constraints on r_xz given r_xy and r_yz

    Today a labmate asked the following question: if we have three random variables x, y, z, and we know the correlations r_{xy} and r_{yz}, what...

    Started by Jake‎, 09-17-2013 01:17 AM
    • Replies: 5
    • Views: 1,355
    05-18-2015, 04:16 PM Go to last post
  53. PCA use

    Hi everybody, Is PCA used to see whether a set of designed items to measure something actually do it? It's a big panic for me. Thank you very much

    Started by nouses‎, 05-18-2015 09:21 AM
    • Replies: 2
    • Views: 197
    05-18-2015, 12:27 PM Go to last post
  54. Research Problem (Hypothesis and Data Analysis)

    I am conducting a research on the influence of school administrators on teachers’ retention. I have collected data on this with likert-scaled (5...

    Started by Toninet‎, 05-16-2015 07:10 AM
    data analysis, hypothesis, research problem
    • Replies: 0
    • Views: 243
    05-16-2015, 07:10 AM Go to last post
  55. Terminology for comparing reference questions to answers after a policy change

    Hi, I´m conducting a questionnaire in order to examine the behavior of drivers of electric vehicles when providing information, such as parking...

    Started by fader‎, 05-16-2015 05:35 AM
    • Replies: 0
    • Views: 158
    05-16-2015, 05:35 AM Go to last post
  56. Three group intervention, confused about study design and analysis

    Please refer to updated post.

    Started by professorzoom‎, 05-14-2015 05:27 PM
    • Replies: 0
    • Views: 183
    05-14-2015, 05:27 PM Go to last post
  57. question regarding Non Parametric Test

    Hi all, I want to test the relation between dependent varaiable and other independent variables, my sample is Companies registered in the...

    Started by kormbo2002‎, 05-12-2015 02:11 PM
    choose test
    • Replies: 1
    • Views: 248
    05-14-2015, 02:22 AM Go to last post
  58. Raw Data vs Frequency Distribution

    Hi, I am new here, please discuss this given below. “Why an average computed from a frequency distribution is not exactly the same as...

    Started by Anum‎, 05-09-2015 07:44 AM
    • Replies: 6
    • Views: 2,286
    05-11-2015, 07:48 AM Go to last post
  59. Question Regarding Research Design

    If I have a dataset with 100 unspecified cases and I know from a previous chart review that the likelihood is that 10% of these are indeed cases how...

    Started by cmcm855‎, 05-10-2015 07:28 PM
    • Replies: 2
    • Views: 203
    05-10-2015, 10:47 PM Go to last post
  60. Composite Hypothesis Testing Problem

    Hello guys, So I have this problem I am trying to solve and its

    Started by glorean‎, 05-10-2015 04:48 PM
    inference, statistics
    • Replies: 0
    • Views: 181
    05-10-2015, 04:48 PM Go to last post

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