1. 10-14-2010
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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: 6,894
    10-11-2014, 12:02 PM Go to last post
  1. Change over time

    Hi all, I am looking at patient activity for a disease and have patient numbers for 5 years (2009-2013). I have numbers for 4 different types: ...

    Started by Duggas03‎, Today 06:03 AM
    patients, time trend
    • Replies: 2
    • Views: 77
    Today, 06:55 PM Go to last post
  2. Stuggling with choosing the correct test.

    So I am analyzing data for a student outside of my department. They are looking to see the differences in exam scores between two different methods...

    Started by dvtolusso‎, 08-19-2016 02:26 PM
    • Replies: 8
    • Views: 316
    Today, 11:19 AM Go to last post
  3. split-split plot with continuous subplot variable

    Hello I am trying to analyze data from a split-split-plot design. The sub-plot is a continuous factor and since we suspect a non-linear...

    Started by szm‎, 08-23-2016 05:54 AM
    ancova, random effects, sas, split-plot
    • Replies: 1
    • Views: 124
    Today, 06:44 AM Go to last post
  4. chi-square test for nested models

    Consider 2 models A and B. A (5 free parameters) is nested within B (6 free parameters). Imagine that we do an experiment and acquire data from N =...

    Started by mathieu‎, 08-24-2016 03:26 PM
    chi-square test, nested models
    • Replies: 2
    • Views: 117
    Yesterday, 11:00 PM Go to last post
  5. What tests and analysis for 50 year data collected on fashion trends

    So, it is said that whatever is in fashion once comes back someday or the other. We have collected data on 10 different garment types, each having 5...

    Started by sshresth12‎, Yesterday 02:38 AM
    cyclicality, research, time series analysis, trend detection
    • Replies: 1
    • Views: 86
    Yesterday, 10:31 AM Go to last post
  6. How does one develop statistical models to compensate for weakness in public data?

    Hi everyone. I have an interview coming up and the role is data centric. I have a strong knowledge of data and management, however I have never...

    Started by Jaysin‎, 08-23-2016 05:28 PM
    • Replies: 7
    • Views: 169
    08-24-2016, 11:08 AM Go to last post
  7. noncentral t distribution

    Please help me prove that the pdf of a noncentral t distribution is a valid pdf. That is, to prove that the integral of the pdf of noncentral t...

    Started by katlego‎, 08-21-2016 09:37 PM
    • Replies: 0
    • Views: 103
    08-21-2016, 09:37 PM Go to last post
  8. Time Series or GARCH? Can't decide..

    Hello, for a research thesis I want to compare returns of different asset classes with another. Think: stock indices, bond indices, a commodity...

    Started by Mastauser‎, 08-21-2016 04:47 AM
    • Replies: 1
    • Views: 119
    08-21-2016, 07:35 PM Go to last post
  9. Bhattacharyya metric as a chi-squared type statistic

    Hi all, I'm reading about the relation between the Bhattacharyya metric and the chi-squared metric:...

    Started by snufkin‎, 08-21-2016 05:47 PM
    • Replies: 0
    • Views: 76
    08-21-2016, 05:47 PM Go to last post
  10. Smile Probability equation X > number

    Error in post - question will be reposted tomorrow to avoid confusion.

    Started by TheFermat‎, 08-19-2016 09:38 PM
    • Replies: 2
    • Views: 109
    08-19-2016, 10:49 PM Go to last post
  11. HELP - citation model in R

    Hello everyone. I need help with the citation model as explained in This article "Bibliometric tools applied to analytical articles: the example...

    Started by terstat‎, 08-18-2016 10:15 AM
    bibliometric, citation, model, r software, statistic
    • Replies: 1
    • Views: 165
    08-18-2016, 03:05 PM Go to last post
  12. Appropriate sample size for unusual "populations"

    There seems to be a lot of literature about determining sample size based on population, margin of error and confidence level. This seems difficult...

    Started by ahhk22‎, 08-15-2016 10:35 PM
    sample size determination
    • Replies: 2
    • Views: 166
    08-16-2016, 08:22 PM Go to last post
  13. Which statistical model to choose?

    Hey guys, I have a few hypotheses in a randomized control trial that I would like to test: 1) Effect of a treatment on several outcome...

    Started by floriisco‎, 08-15-2016 12:58 PM
    hyposteses testing, hypothesis testing, interaction effect
    • Replies: 0
    • Views: 114
    08-15-2016, 12:58 PM Go to last post
  14. HELP- Cumulative meta-analyses conceptual question!

    Hi, Based on the premise that cumulative meta-analysis is a "chronological combining of the experiments will show if there is a consistency in the...

    Started by croberto‎, 08-14-2016 05:27 PM
    • Replies: 1
    • Views: 127
    08-14-2016, 08:52 PM Go to last post
  15. Question Sig diff means - likert scale and multiple variables

    Hi, I have a dataset of 100 survey responses. The survey asked respondents how frequently they engaged in certain leadership behaviours. There...

    Started by evegrace‎, 08-12-2016 09:04 AM
    • Replies: 1
    • Views: 175
    08-13-2016, 09:03 AM Go to last post
  16. Name That Model!

    Keywords: OLS, WLS, GLM, GzLM, Heteroscedasticity , Assumptions, Residuals, Errors Hullo I have been working full time and studying part time...

    Started by dj_johnphillips‎, 08-04-2016 02:33 PM
    • Replies: 7
    • Views: 344
    08-05-2016, 04:22 PM Go to last post
  17. Box's Test after outlier Removal

    Hello everyone, I have searched the forum and couldn't find an answer, so I figured I would start a new thread. I am running a 1-way MANOVA for...

    Started by dvtolusso‎, 08-02-2016 01:58 PM
    • Replies: 0
    • Views: 251
    08-02-2016, 01:58 PM Go to last post
  18. Question Is it right to estimate the mean of scores obtained from Factor Analysis?

    Hi Everyone :) I appreciate any comment about this question: Does it make sense to use the score obtained from a factor analysis to estimate the...

    Started by IsaMolly‎, 07-24-2016 09:48 PM
    • Replies: 6
    • Views: 457
    08-02-2016, 02:44 AM Go to last post
  19. Measuring effect - urgent

    Hi Guys, For my thesis, I am researching the influence of colour (IV) on product attractiveness (DV). Respondents in my experiment choose one of 7...

    Started by Jeroennn‎, 08-01-2016 04:38 AM
    • Replies: 8
    • Views: 207
    08-01-2016, 01:05 PM Go to last post
  20. Reporting effect size/post hocs when not significant- rigorous alpha

    Hello, I have received my manuscript back from reviewers who have suggested that I report Cohen's d for differences found between three groups. ...

    Started by emofield‎, 07-31-2016 09:22 PM
    • Replies: 1
    • Views: 147
    08-01-2016, 08:08 AM Go to last post
  21. Question Testing for trend in a r*c table, in STATA which method should I use?

    I have searched for multiple websites, and only found the information regarding how to test the trend in a 2*k table, which was not the exact...

    Started by belindalimm‎, 07-29-2016 02:04 PM
    • Replies: 0
    • Views: 163
    07-29-2016, 02:04 PM Go to last post
  22. Studies Quality Assesment: interpreted univariate analysis, adjusted for confounding?

    Hello, I am conducting a systematic review on mostly cohort studies. One part of my quality assessment is of course; if the observational study...

    Started by FlorenziH‎, 07-25-2016 08:35 AM
    systematic review
    • Replies: 0
    • Views: 170
    07-25-2016, 08:35 AM Go to last post
  23. 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: 334
    07-22-2016, 05:38 AM Go to last post
  24. Bivariate Contour Ellipse Area

    I have found a research paper, where there is need to calculate the area of a bivariate contour ellipse. I am familiar with drawing a confidence...

    Started by m1chael‎, 07-21-2016 07:25 AM
    • Replies: 0
    • Views: 189
    07-21-2016, 07:25 AM Go to last post
  25. Correct statistical test to compare multiple rates

    Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the...

    Started by CE479‎, 07-20-2016 03:38 PM
    compare risk multiple
    • Replies: 0
    • Views: 151
    07-20-2016, 03:38 PM Go to last post
  26. Unbalanced samples

    Hi! I want to compare between two sample, but they have non equivalent means between demographic parameters such as age and more. What do you...

    Started by Hadar‎, 07-18-2016 06:21 AM
    • Replies: 1
    • Views: 188
    07-18-2016, 08:12 AM Go to last post
  27. Estimating the number of cases (sample size)

    Hi there! I've a perhaps simple question: how can I estimate the number of measurements (cases) to obtain a accurate result? Here an example:...

    Started by unknown‎, 07-17-2016 08:10 AM
    • Replies: 6
    • Views: 238
    07-17-2016, 11:00 PM Go to last post
  28. Multiple Measures (Different Variables) from Same Subjects

    Hi all! This is my first post. I hope someone can offer advice! I have a student with a seemingly simple analytical problem but I cannot...

    Started by bashinsk‎, 07-17-2016 10:25 AM
    • Replies: 2
    • Views: 124
    07-17-2016, 10:44 AM Go to last post
  29. Repeated measures - Within/Between explained

    Hey guys, I'm having troubles understanding my analysis. I have patients going through pulmonary functions test every 2 weeks in 5 different time...

    Started by XPeriment‎, 06-24-2016 12:24 AM
    • Replies: 3
    • Views: 331
    07-16-2016, 08:58 AM Go to last post
  30. Dealing with missing values in cluster analysis

    I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

    Started by fabiangmueller‎, 07-15-2016 05:04 PM
    • Replies: 5
    • Views: 270
    07-16-2016, 06:53 AM Go to last post
  31. Bonferroni correction (significance level and CI)

    Hi there, I need another advice. I'm dealing with the problem of multiple testing and I was planning to use Bonferroni correction. Because I...

    Started by Jeremiah‎, 07-14-2016 05:38 AM
    • Replies: 1
    • Views: 225
    07-14-2016, 07:53 AM Go to last post
  32. Goodness of fit test for categorical data with non-negative real numbersca

    An experiment that I conduct has 5 outcomes: A, B, C and D. I conduct 12 trials for this experiment. I observe, for example: Outcome : Frequency...

    Started by bakwas‎, 06-30-2016 09:48 AM
    categorical data, chi-square test, fishers exact, goodness-of-fit, model comparison
    • Replies: 2
    • Views: 295
    07-14-2016, 01:13 AM Go to last post
  33. What happens after Content Analysis and Cohen's Kappa?

    Hi I have 2 raters for content analysis and have a satisfactory score for Cohen's Kappa (0.805). Can I use either raters' values for analysis or...

    Started by MazOz‎, 07-13-2016 10:23 PM
    cohen's kappa, content analysis
    • Replies: 1
    • Views: 151
    07-14-2016, 01:09 AM Go to last post
  34. Re: what is the best test

    Dear all, I am analysing the data set with two independent variables (syntax, position), two levels each, affecting children's performance on the...

    Started by Eva Edel‎, 07-09-2016 05:45 PM
    • Replies: 1
    • Views: 186
    07-14-2016, 01:08 AM Go to last post
  35. Discrete or Continuous Data and Effect Size

    Dear All, I have a paper with baseline (expressed as median and IQR) and change scores at 12 months (mean, 95%CI) regarding the number of days per...

    Started by Pedro's PhD‎, 07-12-2016 02:47 PM
    • Replies: 0
    • Views: 155
    07-12-2016, 02:47 PM Go to last post
  36. what is the best test

    Hello! I'm not the best at statistics. I understand the theory but I am still uncertain about choosing the appropriate test. I am doing a study...

    Started by Soso13‎, 07-09-2016 01:28 PM
    • Replies: 1
    • Views: 270
    07-09-2016, 04:38 PM Go to last post
  37. Influence of a person in repeat measurement (multilevel) or longitudinal data

    Hey, I have a dataset of 50 people with 4 responses over the year. Responses were a 5-point Likert scale collapsed into a binary variable (0,1)....

    Started by hlsmith‎, 07-07-2016 09:47 AM
    • Replies: 3
    • Views: 301
    07-08-2016, 11:23 AM Go to last post
  38. Model vs. test

    Hi, we just had an interesting discussion about the chi-squared test, that could be generalized. I think the core of the discussion was whether one...

    Started by rogojel‎, 07-03-2016 02:23 AM
    regression model, statistical test
    • Replies: 1
    • Views: 284
    07-07-2016, 09:32 AM Go to last post
  39. Identifying the right way to establish correlations between different topics

    I have multiple topics each with hundreds of questions and different students submitting responses to these questions. What is the best way to...

    Started by sasank‎, 07-02-2016 03:56 AM
    • Replies: 0
    • Views: 186
    07-02-2016, 03:56 AM Go to last post
  40. Poisson process

    Dear statisticians, I have a question that is of great importance for my master thesis in insurance science. I have obtained a dataset that...

    Started by kulstudent‎, 07-01-2016 06:51 AM
    • Replies: 2
    • Views: 241
    07-01-2016, 02:08 PM Go to last post
  41. Question Which interrater reliability test to chose and how to set up the data matrix?

    I have a question regarding which interrater reliability test I should use. The situation is as follows: 12 judges rated 20 profiles with 14...

    Started by Maartenth‎, 07-01-2016 04:24 AM
    interrater reliability
    • Replies: 0
    • Views: 153
    07-01-2016, 04:24 AM Go to last post
  42. Analyzing Likert Scale Data Using Statistical Tools

    Hi everyone, I'm doing an MBA dissertation on the topic "Impact of Customer Service Satisfaction on Business Performance". The hypothesis set is...

    Started by Sahar04‎, 06-24-2016 05:22 AM
    • Replies: 3
    • Views: 522
    06-29-2016, 01:50 AM Go to last post
  43. Gamma distribution

    Hi, If I have three independent variables that all follow the gamma distribution, what distribution will then sum of these variables follow? ...

    Started by samot79‎, 06-28-2016 02:56 AM
    gamma distribution
    • Replies: 0
    • Views: 189
    06-28-2016, 02:56 AM Go to last post
  44. Unhappy How i can analyse two questionnaires to find the Reliability Coefficient

    I am working on a project in which i am comparing Public and Private schools performance for that I have to compare the data on SPSS to find the...

    Started by hafsa‎, 06-26-2016 04:35 PM
    • Replies: 0
    • Views: 222
    06-26-2016, 04:35 PM Go to last post
  45. What model - combining data

    Hi, I have attached a data file which shows 4 ways of describing the same thing. Each way is a small table of 5 numbers. If I explain whats...

    Started by models‎, 06-20-2016 05:32 AM
    • Replies: 2
    • Views: 289
    06-23-2016, 03:08 AM Go to last post
  46. Model Fit is Too Perfect: RMSEA & CFI are perfect; SRMR varies in invariance analyses

    I am running models looking at the fit of new self-report scale I have developed (CFA and measurement invariance by a number of different categories...

    Started by mem162000‎, 01-15-2014 12:47 PM
    • Replies: 9
    • Views: 6,365
    06-22-2016, 03:37 AM Go to last post
  47. Using Factor Scores in Discriminant Analysis

    I am doing research on whether corporations that engage in earnings fraud can be identified up to three years before the fraud occurs. My end result...

    Started by ceilylou‎, 06-21-2016 01:05 PM
    discriminant analisys, factor analyses
    • Replies: 3
    • Views: 232
    06-21-2016, 04:40 PM Go to last post
  48. Which method? Categorical data (IV) and continuous numerical data (DV)

    Thanks in advance for taking a look at my query I have been trying to get some statistical support from my local research department but I am...

    Started by dwilding‎, 06-21-2016 06:17 AM
    categorical data, kruskal-wallis, logistical regresion, one way anova, regression
    • Replies: 0
    • Views: 215
    06-21-2016, 06:17 AM Go to last post
  49. Percent From The Critical Value

    Afternoon, Here is one I haven't experienced before and haven't seen discussed: I have a series of goodness-of-fit tests using chi-square a few...

    Started by c4sadler‎, 06-20-2016 01:46 PM
    • Replies: 0
    • Views: 259
    06-20-2016, 01:46 PM Go to last post
  50. Genes comparison in SPSS

    Hey guys, I have an excel sheet I imported to SPSS all the rows are genes (over 3200), and for each gene I have its expression level in 6...

    Started by XPeriment‎, 06-18-2016 11:30 PM
    • Replies: 1
    • Views: 253
    06-19-2016, 03:38 AM Go to last post
  51. Population Estimation

    Hello, new member here and I've been looking for a way to make a number cruncher for a (imaginary) colony of creatures for an RP I'm making. I'm...

    Started by ravni‎, 06-15-2016 07:59 AM
    population modeling, population statistics
    • Replies: 6
    • Views: 1,034
    06-16-2016, 08:05 AM Go to last post
  52. Welch ANOVA and covariates

    I had planned, because of lack of homogeneity of variance for some of my variables (homoscedasticity) to run a Welch's ANOVA and to use...

    Started by lsrms3‎, 06-15-2016 01:34 PM
    ancova, anova, covariate, covariates, welch
    • Replies: 0
    • Views: 245
    06-15-2016, 01:34 PM Go to last post
  53. What model should I use? Mixed-effect model?

    Hello guys, I really hope you can help me with this. Any ideas/suggestions are welcome. My main goal is to create a model that predicts which...

    Started by Marvin85‎, 03-16-2016 02:22 PM
    • Replies: 13
    • Views: 1,086
    06-14-2016, 11:05 PM Go to last post
  54. large cell counts - Fisher's Exact vs. chi2

    Hi everyone, I read a while back that chi2 was most accurate for observed cell counts of only between 5-70, but now I can't find that reference. I'm...

    Started by DrStatman‎, 06-09-2016 10:54 PM
    chi-squared, exact test
    • Replies: 2
    • Views: 408
    06-14-2016, 04:27 AM Go to last post
  55. Estimation of suitable significance level for high numbers of experiments

    I am a scientist and work with high numbers of experiments. For example: I have tested 1000 different parameters between 2 groups. I found 10...

    Started by AntonS1988‎, 06-13-2016 11:37 AM
    binomial, experiment, false positive, high numbers, significance level
    • Replies: 0
    • Views: 211
    06-13-2016, 11:37 AM Go to last post
  56. ttest for comparison of group means from pooled samples

    Hello, I have results from an experiment where a number (n=50) of biological samples were pooled together with a single measurement of chemical...

    Started by edfromdetroit‎, 06-09-2016 09:38 AM
    aggregate data, pooled samples, ttest
    • Replies: 0
    • Views: 233
    06-09-2016, 09:38 AM Go to last post
  57. Which Non-parametric Significance Test Should I Use?

    Hi, I've been working on a little project. Last year I delivered pizzas. I recorded data for 300 of my deliveries like tip amounts, order totals,...

    Started by 13gentj‎, 06-07-2016 08:36 PM
    exact test, fail assumptions, non-normal, permutation test, randomization test
    • Replies: 5
    • Views: 368
    06-09-2016, 02:34 AM Go to last post
  58. Compound poisson gamma model and biomass data

    I have some biomass data (total count -discrete- of individuals and total dry weight -continuous-) that I would like to model with environmental...

    Started by Nono75‎, 06-07-2016 09:26 AM
    data analysis, modeling techniques
    • Replies: 1
    • Views: 215
    06-07-2016, 01:12 PM Go to last post
  59. Census data: Should I worry about sample size and pvalues?

    Hi all, I have a questions regarding statistical power and sample size. (1) Do I have to worry about sample size in a multiple logistic regression...

    Started by Marvin85‎, 06-03-2016 03:51 PM
    census data, logistic, sample size, statistical power
    • Replies: 6
    • Views: 465
    06-07-2016, 08:22 AM Go to last post
  60. Considering Skewness and Kurtosis

    Hello All, With test data the parameters were created for mean, standard deviation and the two other moments. I then take look at samples one at...

    Started by mike121‎, 06-05-2016 12:40 AM
    • Replies: 0
    • Views: 254
    06-05-2016, 12:40 AM Go to last post

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