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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: 19,424
    10-11-2014, 12:02 PM Go to last post
  1. Question Do the same minimum value requirements apply to chi-square for trend, as chi square?

    Hi, I'm doing a project about dilated kidneys, these can be arranged into mild, moderate and severe. There are 53 patients in total. I want to see...

    Started by nicole-v‎, 07-12-2015 11:05 AM
    chi square, chi square help what test, trend detection, trend test
    • Replies: 0
    • Views: 1,862
    07-12-2015, 11:05 AM Go to last post
  2. Finding degree of difference

    I am given two sets of data collected by two different people. The data in includes the variables area, production and productivity of coconut. Now,...

    Started by geek‎, 07-09-2015 02:16 AM
    degree of difference, statistical analysis
    • Replies: 2
    • Views: 1,539
    07-10-2015, 01:54 AM Go to last post
  3. What to do when survey participants answer all '4's?

    I reached out to members of my organization to rank how they felt the company was performing on various topics, about 35 questions in total. Several...

    Started by Jane M‎, 07-09-2015 10:14 AM
    • Replies: 8
    • Views: 1,717
    07-09-2015, 12:24 PM Go to last post
  4. What to do with unequal sample sizes?

    I am working on this time-effect project in which we pulled data at different time points from a big old data set. The issue is that all subjects...

    Started by skylandyu‎, 07-09-2015 11:47 AM
    friedman test, linear mixed model, repeated measure anova, unequal sample size
    • Replies: 2
    • Views: 2,013
    07-09-2015, 12:01 PM Go to last post
  5. Bracket Medians

    Hi Guys, I really need your help. I have to determined a Bracket Medians using a table having two columns: 1) number of knils, 2) percentage of...

    Started by Nunzia‎, 07-07-2015 03:11 PM
    • Replies: 0
    • Views: 1,288
    07-07-2015, 03:11 PM Go to last post
  6. Need help to combine two indeces

    Hi, I am currently writing my thesis on professionalized political Twitter profiles, and I have created two indeces to measure...

    Started by EirinK‎, 07-07-2015 05:11 AM
    • Replies: 0
    • Views: 1,448
    07-07-2015, 05:11 AM Go to last post
  7. Three parameter Weibull confidence intervals

    I am using the Weibull distribution for reliability, mainly related to material fatigue. For the two-parameter fitting, there are methods for...

    Started by arturo_20‎, 07-03-2015 09:45 AM
    • Replies: 0
    • Views: 1,373
    07-03-2015, 09:45 AM Go to last post
  8. Statistically compare 2 3D structures

    Gíday Statistics Forum Iím having a little bit of trouble with the statistical analysis segment of my honors thesis proposal and was hoping one of...

    Started by MattRNR‎, 07-03-2015 06:59 AM
    • Replies: 0
    • Views: 1,105
    07-03-2015, 06:59 AM Go to last post
  9. using an odds ratio to predict prevalence/incidence in different populations

    Say you have an odds ratio which represents the ratio of outcome given a particular exposure to the outcome given no particular exposure. How can you...

    Started by Rachel Sklar‎, 07-02-2015 12:32 AM
    odds-ratio
    • Replies: 1
    • Views: 1,068
    07-02-2015, 10:08 AM Go to last post
  10. 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, 06-30-2015 01:04 AM
    count data, negative binomial, panel data
    • Replies: 1
    • Views: 1,408
    07-02-2015, 09:18 AM Go to last post
  11. predictor 2 on the causal pathway between predictor 1 and outcome

    Hi: I'm putting together a model which has the purpose of predicting an outcome using a given set of predictor variables; i.e. the main purpose of...

    Started by sigmundo‎, 07-02-2015 03:48 AM
    causal pathway
    • Replies: 0
    • Views: 898
    07-02-2015, 03:48 AM Go to last post
  12. 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, 06-29-2015 03:36 PM
    • Replies: 0
    • Views: 936
    06-29-2015, 03:36 PM Go to last post
  13. 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: 1,032
    06-26-2015, 01:22 PM Go to last post
  14. 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: 1,444
    06-23-2015, 09:24 PM Go to last post
  15. 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: 1,616
    06-23-2015, 03:51 PM Go to last post
  16. 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 01:51 PM
    • Replies: 12
    • Views: 14,209
    06-23-2015, 12:52 PM Go to last post
  17. 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: 4,242
    06-22-2015, 05:04 PM Go to last post
  18. 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: 2,361
    06-22-2015, 07:27 AM Go to last post
  19. 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: 1,152
    06-22-2015, 06:44 AM Go to last post
  20. 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: 1,124
    06-22-2015, 02:27 AM Go to last post
  21. 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: 1,040
    06-20-2015, 10:02 AM Go to last post
  22. 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: 1,415
    06-19-2015, 04:10 PM Go to last post
  23. 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: 1,358
    06-19-2015, 03:54 PM Go to last post
  24. 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: 1,523
    06-19-2015, 07:06 AM Go to last post
  25. 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: 1,048
    06-19-2015, 03:54 AM Go to last post
  26. 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: 1,000
    06-18-2015, 01:40 PM Go to last post
  27. 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: 1,103
    06-18-2015, 11:21 AM Go to last post
  28. 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: 1,006
    06-17-2015, 10:58 AM Go to last post
  29. 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: 1,542
    06-17-2015, 10:49 AM Go to last post
  30. 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: 1,262
    06-13-2015, 09:32 AM Go to last post
  31. 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: 1,770
    06-12-2015, 10:21 AM Go to last post
  32. 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: 1,269
    06-12-2015, 02:44 AM Go to last post
  33. 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: 1,632
    06-11-2015, 03:07 PM Go to last post
  34. 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: 1,534
    06-11-2015, 09:07 AM Go to last post
  35. 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: 2,943
    06-11-2015, 02:42 AM Go to last post
  36. 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: 1,116
    06-10-2015, 05:34 AM Go to last post
  37. 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: 1,130
    06-10-2015, 01:43 AM Go to last post
  38. 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: 1,396
    06-08-2015, 08:10 PM Go to last post
  39. 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: 1,009
    06-08-2015, 05:20 PM Go to last post
  40. 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: 27
    • Views: 4,441
    06-05-2015, 05:18 AM Go to last post
  41. 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: 936
    06-04-2015, 10:35 AM Go to last post
  42. 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: 1,294
    06-03-2015, 07:33 AM Go to last post
  43. 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: 896
    06-03-2015, 03:12 AM Go to last post
  44. 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: 1,070
    06-02-2015, 01:30 AM Go to last post
  45. 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 05:51 PM
    • Replies: 1
    • Views: 4,305
    06-01-2015, 05:18 AM Go to last post
  46. 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: 1,623
    06-01-2015, 03:11 AM Go to last post
  47. 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: 1,358
    05-31-2015, 07:28 AM Go to last post
  48. 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: 3,856
    05-30-2015, 05:37 AM Go to last post
  49. 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: 1,238
    05-29-2015, 06:47 AM Go to last post
  50. 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: 1,065
    05-29-2015, 04:15 AM Go to last post
  51. 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: 2,104
    05-28-2015, 05:07 AM Go to last post
  52. 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: 1,126
    05-26-2015, 11:54 PM Go to last post
  53. 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: 1,205
    05-26-2015, 07:04 AM Go to last post
  54. Spearmanís rho & the uncountability of the Real Numbers

    Iím 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: 1,972
    05-25-2015, 04:40 PM Go to last post
  55. 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: 1,203
    05-23-2015, 04:11 AM Go to last post
  56. 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: 806
    05-23-2015, 03:47 AM Go to last post
  57. 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: 793
    05-22-2015, 09:13 AM Go to last post
  58. 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: 1,210
    05-22-2015, 05:47 AM Go to last post
  59. 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: 1,626
    05-21-2015, 09:05 PM Go to last post
  60. 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: 997
    05-21-2015, 02:21 PM Go to last post

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