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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: 18,755
    10-11-2014, 12:02 PM Go to last post
  1. 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: 3,604
    05-30-2015, 05:37 AM Go to last post
  2. Quick Chi-Square Question

    Hi all, I'm familiar with chi-square and have used it for a while at work. Just wondering something... When calculating the Chi-Square for each...

    Started by Chris Brunskill‎, 09-02-2011 08:51 AM
    • Replies: 4
    • Views: 2,265
    03-18-2014, 09:23 AM Go to last post
  3. Mediation Analysis with Categorical IV with 4 levels

    Hello all, I would like to do a mediation analysis using the following 3 variables: 1. Integration Strategy: This is the independent variable. It...

    Started by tez_s‎, 08-15-2012 07:20 AM
    dummy coding, mediation analysis, regression
    • Replies: 4
    • Views: 9,350
    12-16-2014, 08:27 PM Go to last post
  4. Rasch Analysis

    Hello all, someone asked me to look into Rasch Analysis. I have found a few articles that I am going to read but I was just curious if anybody is...

    Started by lancearmstrong1313‎, 11-20-2012 07:05 AM
    • Replies: 4
    • Views: 3,588
    02-23-2016, 12:09 PM Go to last post
  5. Negative confidence intervals

    HI THERE!! I am presenting 95% CIs in my thesis for the means of the data sets like metric tons of tuna exported per month, value of tuna exported...

    Started by nelson_rabbit‎, 09-24-2013 06:18 AM
    • Replies: 4
    • Views: 4,491
    09-24-2013, 08:47 AM Go to last post
  6. Searching for data reduc

    Hello, I am so confused and so depressed, I hope someone can help. In my Database I have a plenty of datas about 1000 machines. It is to hard to...

    Started by Shari‎, 11-18-2013 12:43 PM
    • Replies: 4
    • Views: 1,212
    11-22-2013, 02:48 PM Go to last post
  7. p-value for nearest neighbor classification

    Hi all, For the past few days, I have been trying to compute a p-value for some experiment I ran recently, and I simply cannot figure it out. ...

    Started by popolon‎, 11-23-2013 11:57 AM
    • Replies: 4
    • Views: 3,009
    11-24-2013, 03:58 AM Go to last post
  8. ANOVA: )Genre of Series (IV) +Gender (Moderator) effect on Purchase Intention (DV)

    Hey, In my research I have as IV the Genre of the series (comedy vs drama). The moderator is Gender. And I want to see how this effects purchase...

    Started by RaulS1987‎, 12-10-2013 10:30 AM
    • Replies: 4
    • Views: 1,478
    12-16-2013, 11:21 AM Go to last post
  9. Statistical justification for Cochrans Q please

    Please may someone tell me the proper way to write a statistical justification for a Cochrans Q .. By any chance is it the same a t-test? ...

    Started by AthenaAnkou‎, 12-29-2013 12:50 PM
    • Replies: 4
    • Views: 1,447
    12-29-2013, 06:57 PM Go to last post
  10. Dummies in a correlation matrix

    Hi everyone, I am working on a multiple moderate regression. And just wanted to add the correlation matrix as well. Now I got the responds that...

    Started by Jul!a‎, 02-27-2014 11:12 AM
    correlation matrix, dummy variables
    • Replies: 4
    • Views: 2,129
    02-27-2014, 12:07 PM Go to last post
  11. Need help with medical study

    Hi, I'm writing a medical paper on asthma and I'm afraid I 've reached a point where I am unconfident of my statistics knowledge. I am...

    Started by sethnk1234‎, 03-04-2014 02:36 PM
    anova, p-value, t-test
    • Replies: 4
    • Views: 1,522
    03-04-2014, 03:42 PM Go to last post
  12. Appropriate statistics where dataset contains only positive cases?

    Sorry if this sounds confusing or uses the wrong terminology, I'll do my best to explain. I have a data set of approximately 100 records, where...

    Started by spss_n00b‎, 04-07-2014 10:05 AM
    • Replies: 4
    • Views: 1,798
    04-08-2014, 02:51 PM Go to last post
  13. Meta Analysis Question: Is this even possible?

    Here's the situation: a colleague has a stats consultant who is saying the following type of meta-analysis is possible. He has replicated a study...

    Started by metageek‎, 04-23-2014 07:18 PM
    • Replies: 4
    • Views: 1,259
    04-23-2014, 08:56 PM Go to last post
  14. obtaining an unbiased estimator for the min: x_(1)

    How would I go about finding an unbiased estimator for the minimum order statistic for a given PDF and distribution. Example: ...

    Started by revans.evans‎, 04-24-2014 10:25 PM
    biased estimator, estimation
    • Replies: 4
    • Views: 1,278
    04-25-2014, 10:30 AM Go to last post
  15. SEM: How to Label path diagram and translate it into Equations

    Hei hou I'm new here. So hello everybody. I have a problem. It's about SEM (structural equation model). I have to lable a path diagram...

    Started by mejorixx‎, 04-30-2014 02:51 AM
    • Replies: 4
    • Views: 1,234
    04-30-2014, 07:03 PM Go to last post
  16. Unbalanced sample - which test do I use?

    I have two samples - group 1 has 26 participants / group 2 has 44 participants I was planning to use a two-way anova to analyze various aspects of...

    Started by jtedford‎, 06-17-2014 12:42 PM
    • Replies: 4
    • Views: 1,458
    06-17-2014, 01:16 PM Go to last post
  17. Correlating A with B, half of subjects has a 0 value for A. Should I exclude them?

    (sorry for the doublepost, I feel like I may have posted this in the wrong forum in the first place, feel free to move/delete the other thread; it...

    Started by nightale‎, 07-12-2014 11:02 AM
    • Replies: 4
    • Views: 1,158
    07-12-2014, 03:25 PM Go to last post
  18. Repeated Measures ANOVA and baseline control

    Ive been asked to work on a cross-over design study for an MSc project. The study is looking at the effects of sleep deprivation on word recall....

    Started by loops22‎, 07-29-2014 05:40 AM
    • Replies: 4
    • Views: 2,165
    07-29-2014, 07:15 AM Go to last post
  19. Continuous response variable and categorical predictor - what type of analysis to use

    Hi, I am dealing with data in which the IV's are not easily partitioned - participants can belong to one, two+, or none of the categories for a given...

    Started by bcrider‎, 08-16-2014 12:53 PM
    analisys, linear regression, methodology
    • Replies: 4
    • Views: 1,305
    08-16-2014, 03:44 PM Go to last post
  20. Generalized estimating equations and multiple imputation

    Hi, I'm running a Generalized estimating equation model with multiple imputed data but I can not get a pooled outcome. Do anyone have a solution to...

    Started by Ulrik‎, 10-29-2014 03:54 AM
    gee multiple imputation
    • Replies: 4
    • Views: 2,999
    10-29-2014, 03:06 PM Go to last post
  21. Repeated measures data

    Hello I want to test the significance between the treatments on repeated measures. I have the 3 groups A, B and C and response for them was...

    Started by rzs0034‎, 11-04-2014 07:52 PM
    • Replies: 4
    • Views: 2,444
    11-07-2014, 02:35 AM Go to last post
  22. Statistical analysis of longitudinal data using multi-level model?

    Hello! This is my first post, I'm just wondering if I can use this approach? I want to research the opinion of 8 countries(data is a proportion),...

    Started by Talik‎, 11-14-2014 05:48 PM
    • Replies: 4
    • Views: 1,813
    11-18-2014, 06:03 PM Go to last post
  23. Question Calculate Sample size using calculator ?

    Hello Can some one give me formula to calculate sample size using calculator or manually. This data I have right now: Population size = 500...

    Started by hanialbarni‎, 12-25-2014 07:01 PM
    • Replies: 4
    • Views: 2,098
    01-11-2015, 12:00 PM Go to last post
  24. Structural Equation Modeling: When and why do you use Z-scores instead of Mean.

    Hi. Can anyone help me answer the question why some people who do SEM use z-scores as opposed to using mean scores? (articles and books are...

    Started by dmorga‎, 01-15-2015 03:13 AM
    sem, z-scores
    • Replies: 4
    • Views: 4,636
    01-15-2015, 11:27 AM Go to last post
  25. Angry Call response time distribution [Help needed]

    Hello everyone! I'm new to this forum but I want to start off by making a request. The thing is I'm working on a project regarding call-back...

    Started by The_Chosen_One‎, 02-04-2015 07:22 PM
    • Replies: 4
    • Views: 1,393
    02-05-2015, 01:46 PM Go to last post
  26. How to alter the standard deviation of an empirical distribution?

    For the purpose of a simulation I need to increase the standard deviation of an empirical distribution. I want to simulate what will happen if the...

    Started by consuli‎, 02-21-2015 09:46 AM
    • Replies: 4
    • Views: 2,116
    02-21-2015, 05:46 PM Go to last post
  27. Method to estimate whether two data sets are from the same distribution

    Hello, I have two data sets from two different experiments. I would like to know whether there exist Bayesian (or frequentist) methods which would...

    Started by Urian666‎, 04-20-2015 07:34 AM
    • Replies: 4
    • Views: 2,031
    04-20-2015, 04:13 PM Go to last post
  28. 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: 1,520
    06-01-2015, 03:11 AM Go to last post
  29. 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: 2,716
    06-11-2015, 02:42 AM Go to last post
  30. 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: 1,458
    06-17-2015, 10:49 AM Go to last post
  31. 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
    • Replies: 4
    • Views: 1,437
    06-19-2015, 07:06 AM Go to last post
  32. 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: 2,143
    06-22-2015, 07:27 AM Go to last post
  33. 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: 1,436
    08-06-2015, 07:46 AM Go to last post
  34. 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: 1,759
    08-07-2015, 04:22 PM Go to last post
  35. ANOVA or Correlational analysis? Which one to use?

    Hello everyone, I am currently working on my dissertation and aim to identify the relationship between parent-child interaction and behavior of...

    Started by Andy26‎, 10-18-2015 02:25 PM
    • Replies: 4
    • Views: 1,668
    10-22-2015, 06:35 AM Go to last post
  36. Kruskal-Wallis or Poisson regression for parasite count data?

    Trying to figure out how best to carry out this analysis... So essentially I have four different species of Deer mice, infected with a high, medium,...

    Started by zoonotic‎, 10-27-2015 10:12 AM
    count data, kruskal-wallis, parasitology, poisson regression
    • Replies: 4
    • Views: 1,527
    10-27-2015, 05:28 PM Go to last post
  37. How should I explain this results?

    The hypothesis is: the willing-to-pay is higher when people see print ad with testimonial. So there are four print ads 1. 1 cola ad with...

    Started by yue86231‎, 11-13-2015 07:57 AM
    • Replies: 4
    • Views: 1,594
    11-14-2015, 01:34 PM Go to last post
  38. binary choice with fisheries data over time

    Hi all, I am new to the forum so please bear with me if I am not following protocol in my post. I have fisheries data which is vessel specific....

    Started by senegale‎, 11-17-2015 03:31 PM
    • Replies: 4
    • Views: 1,495
    11-19-2015, 02:19 PM Go to last post
  39. How should I further analyse this result?

    I have following variables: -"adtype" (1 is print ad with testimonials, 2 is print ad without testimonials.) -"AT1" which is "ad attitude...

    Started by yue86231‎, 11-24-2015 09:45 AM
    • Replies: 4
    • Views: 2,065
    12-04-2015, 04:05 AM Go to last post
  40. correlation matrix: Bonferroni or not Bonferroni is my question

    Hello all, When constructing correlation matrices, a number of people claim that one should apply the Bonferroni adjustment if the number of...

    Started by andik‎, 12-02-2015 07:47 PM
    • Replies: 4
    • Views: 1,421
    12-03-2015, 08:50 PM Go to last post
  41. normal distribution

    Hello I have two separate population (sick/ not sick), that I wanted to check if a specific variable (cognitive variable- general mind wandering...

    Started by talgef‎, 12-22-2015 05:07 AM
    • Replies: 4
    • Views: 2,194
    12-29-2015, 05:16 AM Go to last post
  42. Variance across different sample sizes

    Hello, I want to know how I can interpret variance when the sample sizes are not exact. Here is my problem: I am analyzing daily playing data...

    Started by theyjamin‎, 12-29-2015 05:39 PM
    • Replies: 4
    • Views: 1,430
    01-04-2016, 05:43 PM Go to last post
  43. Smile Fisher's Exact test and subjects with multiple observations?

    Hi Everyone, I was wondering if I could please have some advice on how to deal with data that have multiple observations for some of the subjects...

    Started by NenaB‎, 01-19-2016 02:45 PM
    difference in proportions, fisher's exact, proportions, related observations
    • Replies: 4
    • Views: 1,314
    01-20-2016, 06:31 PM Go to last post
  44. How can I best analyze this data

    I have some data I am trying to analyze but was hoping to get some stats help with it. I'm not sure what the best way to analyze it is. I'm...

    Started by YellowM3‎, 01-24-2016 07:19 PM
    • Replies: 4
    • Views: 2,494
    04-13-2016, 04:04 PM Go to last post
  45. Leave-one-out cross validation

    Hi, I am trying to understand the Leave-one-out cross validation method but all sources explain it mathematically. Can someone please basically...

    Started by jsmith613‎, 02-01-2016 02:35 PM
    • Replies: 4
    • Views: 842
    02-01-2016, 09:05 PM Go to last post
  46. test of normality help

    Dear Friends i need help in statistical research paper kindly assist some help thank you.

    Started by malko‎, 03-01-2016 11:12 AM
    • Replies: 4
    • Views: 1,389
    03-03-2016, 08:02 PM Go to last post
  47. Nonparametric for paired, but unequal sample size

    Hi, I'm in the midst of writing my master thesis, but I'm having issues with the statistics. I've measured muscle cells. In short, I've 4...

    Started by Conxile‎, 03-14-2016 04:47 AM
    • Replies: 4
    • Views: 1,186
    03-14-2016, 10:29 AM Go to last post
  48. Pre and Post with Treatment group - ANOVA , ANCOVA, Regress differences???

    Hello friends, My main task is to "test" if staff member who participated in the counseling sessions had fewer "Use of Force (UOF)" incidents in...

    Started by Marvin85‎, 05-11-2016 11:19 AM
    ancova, anova, pre post
    • Replies: 4
    • Views: 1,867
    05-12-2016, 10:00 AM Go to last post
  49. Appropriate test for quantitative content analysis of one newspaper

    Hi everyone, I am examining the differences in media coverage of homicide on the basis of the religion of the victim (bias). The sample is one...

    Started by Mikkey‎, 05-19-2016 07:55 PM
    content analysis, dependent, independent, methodology, t-test
    • Replies: 4
    • Views: 1,369
    05-22-2016, 07:15 AM Go to last post
  50. Good sources (books, articles, ....) on the history of Monte Carlo methods?

    I am finally entering the final step of my PhD. Chapter 1 of my dissertation has already been published, Chapter 2 has been submitted for publication...

    Started by spunky‎, 07-21-2016 02:54 PM
    monte carlo, multivariate
    • Replies: 4
    • Views: 2,464
    07-22-2016, 05:38 AM Go to last post
  51. 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: 2,296
    09-08-2016, 12:28 PM Go to last post
  52. Difference between two independent proportions

    Hello, I am not a statistician, however, for my latest small research, I would like to test whether there is a difference between two independent...

    Started by Zuzanah‎, 11-07-2016 07:10 AM
    chi-square, proportion test, z-test
    • Replies: 4
    • Views: 4,192
    03-03-2017, 01:48 PM Go to last post
  53. Sample Size Help for Observation Study

    I wanted to calculate sample size for a single group, observational study. I'll be using a questionnaire to predict outcome (i.e. score on another...

    Started by murphy‎, 12-15-2016 11:36 PM
    • Replies: 4
    • Views: 3,142
    12-16-2016, 10:29 AM Go to last post
  54. Which tests to use in these examples? Wilcoxon etc.

    I'm pretty clueless, but would appreciate any help very much. I have: Group 1: went from nothing, to receiving surgery 1, and then later on...

    Started by LasseNordenhem‎, 05-08-2017 06:05 AM
    mann whitney, non parametric tests, wilcoxon
    • Replies: 4
    • Views: 1,003
    05-08-2017, 07:40 AM Go to last post
  55. comparing section in a scale using spss

    Hi everyone; hope you are doing well, I am actually conducting a research, and I am comparing between a pre and post scale. my problem is that...

    Started by rukia‎, 03-24-2017 07:54 AM
    • Replies: 4
    • Views: 1,477
    04-02-2017, 09:55 PM Go to last post
  56. Anova with data reduction? (Experimental design)

    Hi, this is my first post, I hope to do nothing wrong like posting in the wrong area.:pag It happens that I did an experiment where I have a...

    Started by Bardock‎, 03-01-2017 08:59 AM
    anova observations, data, data analysis, reduction os data
    • Replies: 4
    • Views: 2,034
    03-03-2017, 01:37 AM Go to last post
  57. Dealing with regression to the mean

    If I have two time points T1 and T2 and separate the groups based on their performance at T1 (High v Low), then after treatment assess their...

    Started by Palermo‎, 01-11-2017 08:10 AM
    • Replies: 4
    • Views: 3,034
    01-12-2017, 10:52 PM Go to last post
  58. need help interpreting this Pearson R Correlation data

    Hi, I have a question and would welcome advice. I have conducted a pearson R stats test in SPSS and found that there is no relationship between...

    Started by returnofirv‎, 05-29-2017 06:44 AM
    • Replies: 4
    • Views: 871
    05-29-2017, 09:00 AM Go to last post
  59. Poll Poll: Confidence Intervals: Closed or Open Intervals

    I want to pose a question, mainly theoretical in nature, but applied responses are more than welcome. First, I'll define some terms. An interval...

    Started by ondansetron‎, 10-05-2017 06:45 PM
    • Replies: 4
    • Views: 209
    10-10-2017, 06:26 PM Go to last post
  60. New guy, Stats help needed with this problem.

    Hi guys, I'm taking Mathematical Statistics course and we are following Statistical Inference book by George Casella. I was able to solve most of...

    Started by $tatsGuy‎, 10-10-2007 09:48 PM
    • Replies: 3
    • Views: 2,937
    10-11-2007, 11:30 AM Go to last post

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