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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: 3,618
    10-11-2014, 12:02 PM Go to last post
  1. Applying parametric tests on non-parametric data

    Hi all, I'm doing a research and I have some concerns, and I'd appreciate your kind assistance on them. Basically, I'm designing an instrument...

    Started by vjyofudp‎, Today 10:11 AM
    • Replies: 1
    • Views: 67
    Today, 01:21 PM Go to last post
  2. Inaccuracy of Non-Parametric Bootstrap for great sample sizes in Excel-VBA

    My aim is to evaluate the performance of parametric and non-parametric Bootstrap under specific circumstances; and particularly their ability to...

    Started by Paris‎, Yesterday 05:15 PM
    bootstrap, bootstrapping, confidence intervals, non parametric, non-parametric bootstrap
    • Replies: 0
    • Views: 72
    Yesterday, 05:15 PM Go to last post
  3. Event study analysis significance tests

    Dear all This is my first post in the forum. I'm sorry if this question already came up, I used the search function but did not find anything. I...

    Started by fossle‎, 08-28-2015 04:14 AM
    • Replies: 0
    • Views: 127
    08-28-2015, 04:14 AM Go to last post
  4. How to analyse a set of data without normality and homoscedasticity?

    Hello, I'm a postgraduate student in Biology. From some time on, I wanted to publish a paper regarding the affectance of temperature to the shell...

    Started by Alaris‎, 08-28-2015 02:08 AM
    • Replies: 0
    • Views: 98
    08-28-2015, 02:08 AM Go to last post
  5. Differences in differences analysis( 2 vs 1 data values)

    Hello I am carrying out a differences in differences analysis for the effects of a treaty agreement on GDP of countries who entered the treaty(...

    Started by stat&data‎, 08-27-2015 03:02 PM
    • Replies: 0
    • Views: 96
    08-27-2015, 03:02 PM Go to last post
  6. How to compare the slopes of two graphs or trend lines

    Hi I have 2 variables which trend over time ( by year). One variable is the mutation rate and the other is drug use. There are 333 samples each...

    Started by vanhas‎, 08-27-2015 08:03 AM
    • Replies: 1
    • Views: 114
    08-27-2015, 11:02 AM Go to last post
  7. Comparing categorical and numerical results simultaneously

    Hi all, This question is in regards to options for analysing a dataset. I have a dataset where we have 23 video clips that have been treated using...

    Started by Sicyopterus‎, 08-27-2015 12:17 AM
    ecology, statistical analysis, statistical design
    • Replies: 0
    • Views: 106
    08-27-2015, 12:17 AM Go to last post
  8. Statistical tests for the analysis of acoustic parameters of one speaker

    Hello! I would like to address the question regarding the statistics. I am analyzing the relation between the narrow focus and fundamental...

    Started by draganvarajic‎, 08-26-2015 05:38 AM
    • Replies: 0
    • Views: 116
    08-26-2015, 05:38 AM Go to last post
  9. comparing models

    This might be a "101" question but hey, The Ecologist" encouraged me to ask questions , lots and lots of stupid questions. So when I have two...

    Started by bugman‎, 08-21-2015 12:14 AM
    • Replies: 6
    • Views: 295
    08-22-2015, 12:32 AM Go to last post
  10. RCT with several follow-up measures. How to counterbalance the dependent variable?

    Hi everyone, I am new here so I hope I post this in the right Sub! Please let me know if there is a better Sub for it- I appreciate your help!! :)...

    Started by Hanni_Berlin‎, 08-20-2015 07:22 AM
    • Replies: 0
    • Views: 135
    08-20-2015, 07:22 AM Go to last post
  11. Statistical Analysis for Master's Thesis

    Hello Everyone, So this is my first forum post ever :) probably because I just couldn't figure out solution by myself this time. Thank you in...

    Started by may_survey‎, 08-14-2015 06:24 PM
    multinomial, thesis
    • Replies: 6
    • Views: 450
    08-18-2015, 06:34 PM Go to last post
  12. cross-tabs or non-parametric independent sample t-test

    I have conducted a survey to determine if there is a significant difference in the number farmers and non-farmers which agree to a specific farming...

    Started by MayTrix‎, 07-23-2015 10:04 AM
    cross tabulation, non parametric
    • Replies: 7
    • Views: 519
    08-17-2015, 01:32 PM Go to last post
  13. Seeking help for the interpretation of model fit indices

    Hi everyone... Please help me with the following question I'm doing my research that one of it aims is to test the model fit of a particular model....

    Started by deden‎, 08-16-2015 07:25 AM
    chi square, gfi, interpretation, model fit indices, sem
    • Replies: 0
    • Views: 159
    08-16-2015, 07:25 AM Go to last post
  14. Seeking help on Inferential Stats

    Sir, Please help in the following question.Kindly lay emphasis on the reasoning behind selecting any particular test to solve it. Ques--On an...

    Started by Sherlock‎, 08-15-2015 02:18 AM
    • Replies: 0
    • Views: 181
    08-15-2015, 02:18 AM Go to last post
  15. Poisson/Gamma model (empirical Bayes), prior distribution parameters calculation

    Hello everyone, I want to calculate the α and β estimates of the prior (Gamma) distribution for the Poisson/Gamma model based on the Empirical...

    Started by Paris‎, 08-14-2015 01:11 PM
    empirical bayes, estimation, parameter estimation, poisson gamma model, prior distribution
    • Replies: 0
    • Views: 126
    08-14-2015, 01:11 PM Go to last post
  16. Exploratory Factor Analysis problems

    Independent Variable: 49 state survey of state court administration: how much power does the state court administrator have over 31 separate...

    Started by cynicalflyer‎, 08-11-2015 03:22 PM
    • Replies: 2
    • Views: 244
    08-12-2015, 07:44 AM Go to last post
  17. Calculating forecast error for a long-term volatility forecast

    Hi, I am trying to calculate the forecast standard error for a long-term volatility forecast of a time series. I am simply using the unbiased...

    Started by AndrewLong‎, 08-11-2015 05:55 AM
    error, forecast, forecast error, standard error, volatility
    • Replies: 0
    • Views: 162
    08-11-2015, 05:55 AM Go to last post
  18. Power calculation for accuracy tests

    Excuse my ignorance I would like to do a simple study. I have 3 screening tests and a gold standard test which will put patients into +ve and -ve...

    Started by drflett‎, 08-07-2015 06:44 AM
    • Replies: 2
    • Views: 196
    08-10-2015, 02:41 PM Go to last post
  19. Multiple Linear Regression or Hierarchical MLR?

    Hi team. I will be studying the non-causational relationship between coping and posttraumatic growth in bereavement where: Coping is a single...

    Started by rustyhinges‎, 08-09-2015 02:23 PM
    • Replies: 0
    • Views: 138
    08-09-2015, 02:23 PM Go to last post
  20. Calculating variance for variable derived from two correlated variables

    Hello, I am analyzing a dataset based on a survey of organic farmers. Among other things, I have data about the farmer's organic seed usage and...

    Started by JaredZystro‎, 08-05-2015 03:41 PM
    • Replies: 4
    • Views: 249
    08-07-2015, 04:22 PM Go to last post
  21. 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: 154
    08-07-2015, 08:15 AM Go to last post
  22. How To Test A Distribution For Normalcy

    I'm looking for Visual Basic source code that will, after entering the data of a distribution, test that distribution for being normal or 'almost'...

    Started by TheStatProf‎, 08-06-2015 08:45 PM
    formula, normality test
    • Replies: 0
    • Views: 140
    08-06-2015, 08:45 PM Go to last post
  23. Research Study

    Hello everyone, I would like to ask for help regarding my YES/No Survey. Could somebody me how to compute for this. thanks!!:):):)

    Started by yav‎, 08-06-2015 03:19 AM
    • Replies: 3
    • Views: 162
    08-06-2015, 07:50 AM Go to last post
  24. Kolmogorov-Smirnov vs. Kuiper test

    Hello, I would like to compare two 2D distributions with quantitative variables, illustrated here: For each "x", they are several measures...

    Started by recherche888‎, 08-05-2015 12:21 PM
    • Replies: 7
    • Views: 245
    08-06-2015, 07:48 AM Go to last post
  25. Need help picking a statistical procedure

    Hello all, We have collected quite a bit of data and we would like to write it up as a study, but we are having trouble determining which...

    Started by LCs&c‎, 08-05-2015 12:02 PM
    • Replies: 4
    • Views: 160
    08-06-2015, 07:46 AM Go to last post
  26. Not sure what statistical test to use

    Hello: I have a couple of questions regarding what statistical test I should choose. Any help on this would be greatly appreciated! Break down on...

    Started by Dgs878‎, 08-05-2015 09:24 AM
    • Replies: 0
    • Views: 113
    08-05-2015, 09:24 AM Go to last post
  27. maximizing probability that one variable is greater than another

    hi, There is a random variable X with a known distribution along its support interval, say, . Need to find a distribution function of another...

    Started by Vova‎, 07-28-2015 06:58 AM
    • Replies: 2
    • Views: 355
    07-29-2015, 07:18 AM Go to last post
  28. Exclamation What statistical analysis tests to use for these 3 questions

    1. Examining the effects of being a victim of violence (categorical yes/no) on hostile attribution scores (continuous variable)? 2. Examining the...

    Started by lindalmw‎, 07-13-2015 04:43 AM
    • Replies: 3
    • Views: 428
    07-29-2015, 03:10 AM Go to last post
  29. multiple measurements per condition for a repeated measures ANOVA

    I want to know whether I can use the repeated measures ANOVA for my analysis - I collected from 1 to 6 data points per condition from each of 13...

    Started by relliott‎, 07-28-2015 04:48 PM
    repeated measure anova
    • Replies: 2
    • Views: 159
    07-29-2015, 02:58 AM Go to last post
  30. Multiple Comparisons across events with discrete probabilities?

    Been stuck on this problem for a few days. I have calculated many distributions that are all non-parametric, but appear to have trended to be...

    Started by eagb‎, 07-22-2015 10:33 AM
    discrete probability, multiple comparisions, non-parametric test
    • Replies: 0
    • Views: 113
    07-22-2015, 10:33 AM Go to last post
  31. post-hoc for nonparametric paired data in groups of unequal sizes

    I am trying to do post-hoc analysis for nonparametric data. The group sizes are unequal but are paired. I've found several tests online,...

    Started by skylandyu‎, 07-21-2015 01:54 PM
    • Replies: 5
    • Views: 259
    07-22-2015, 09:54 AM Go to last post
  32. correcting for early user bias

    Okay, forgive me if this is in the wrong place. Feel free to move it if it isn't. And please forgive me as I know VERY little about statistics and my...

    Started by hoodleehoo‎, 07-20-2015 01:38 PM
    • Replies: 7
    • Views: 299
    07-20-2015, 08:24 PM Go to last post
  33. Transformation of panel count variables with multitude of zero values

    Hello dear forum members! For a panel of 1,700 physicians observed from 2009 to 2013, my data includes two variables -- number of favorable(fav)...

    Started by kiton‎, 07-19-2015 02:58 PM
    • Replies: 3
    • Views: 239
    07-20-2015, 04:05 PM Go to last post
  34. methods for selection a subset of population to measure biomarkers

    Hi! In a quite large time-to-event clinical trial project, the population is very large (more than 1,000 people). I want to measure the subjects'...

    Started by freezingswallow‎, 07-20-2015 12:49 PM
    biomarkers, survival analysys
    • Replies: 1
    • Views: 134
    07-20-2015, 03:09 PM Go to last post
  35. stat test

    I want to test the following hypothesis. Which test would be appropriate to test it? H1: The Millennials in YMCA Central Florida score lower in...

    Started by eunkum‎, 07-15-2015 07:42 PM
    • Replies: 1
    • Views: 366
    07-18-2015, 12:12 PM Go to last post
  36. How to fix mistake of changing psychometric seven point scale to a five point scale?

    :shakeheadHi my first research project uses 3 psychometric scales which have all been peered reviewed as valid & reliable. I mistakenly thought it...

    Started by longpaddock‎, 07-15-2015 04:42 AM
    • Replies: 0
    • Views: 240
    07-15-2015, 04:42 AM Go to last post
  37. Error with Skillings-Mack test in R

    I was trying to perform a Skillings-Mack test in R and can only get error message saying "Error in split.default(x = seq_len(nrow(x)), f = f, drop =...

    Started by skylandyu‎, 07-13-2015 12:12 PM
    • Replies: 0
    • Views: 259
    07-13-2015, 12:12 PM Go to last post
  38. 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: 216
    07-12-2015, 11:05 AM Go to last post
  39. 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: 341
    07-10-2015, 01:54 AM Go to last post
  40. 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: 302
    07-09-2015, 12:24 PM Go to last post
  41. 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: 200
    07-09-2015, 12:01 PM Go to last post
  42. 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: 212
    07-07-2015, 03:11 PM Go to last post
  43. 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: 163
    07-07-2015, 05:11 AM Go to last post
  44. 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: 241
    07-03-2015, 09:45 AM Go to last post
  45. Statistically compare 2 3D structures

    Gday Statistics Forum Im 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: 175
    07-03-2015, 06:59 AM Go to last post
  46. 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: 207
    07-02-2015, 10:08 AM Go to last post
  47. 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: 265
    07-02-2015, 09:18 AM Go to last post
  48. 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: 133
    07-02-2015, 03:48 AM Go to last post
  49. 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: 188
    06-29-2015, 03:36 PM Go to last post
  50. 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: 265
    06-26-2015, 01:22 PM Go to last post
  51. 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: 330
    06-23-2015, 09:24 PM Go to last post
  52. 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: 463
    06-23-2015, 03:51 PM Go to last post
  53. 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: 8,760
    06-23-2015, 12:52 PM Go to last post
  54. 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: 265
    06-22-2015, 05:04 PM Go to last post
  55. 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: 350
    06-22-2015, 07:27 AM Go to last post
  56. 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: 163
    06-22-2015, 06:44 AM Go to last post
  57. 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: 214
    06-22-2015, 02:27 AM Go to last post
  58. 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: 251
    06-20-2015, 10:02 AM Go to last post
  59. 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: 235
    06-19-2015, 04:10 PM Go to last post
  60. 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: 180
    06-19-2015, 03:54 PM Go to last post

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