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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: 18,004
    10-11-2014, 12:02 PM Go to last post
  1. Excel sample size comparison

    I have two independent groups that tested their own sample size (based on their group's sampling rules) of the same data for process failures. Group...

    Started by Compliance Carl‎, 09-18-2017 12:47 PM
    compliance, defect data
    • Replies: 0
    • Views: 153
    09-18-2017, 12:47 PM Go to last post
  2. Choosing the correct analysis

    Hi everyone, Really needing help with choosing the right analysis for my variables. Background: I'm looking at the difference in amplitude...

    Started by meeks‎, 09-06-2017 12:37 AM
    analysis, anova, categorical, continuous, variables
    • Replies: 1
    • Views: 315
    09-06-2017, 08:35 AM Go to last post
  3. Best Stat Question Ever?

    Got this off Twitter (@galka_max) and found it interesting: If you choose an answer to this question at random, what is the chance you will get it...

    Started by The Game‎, 06-20-2017 09:42 PM
    • Replies: 8
    • Views: 700
    09-06-2017, 01:14 AM Go to last post
  4. Repeated Measures ANOVA or Linear Mixed Effects?

    Hey Statisticians! I have a bit of a conundrum. I have a 2x3 model with factors Drug (E0,E1) and Music (No Music 1, Music, No Music 2). I have...

    Started by DeDw‎, 09-04-2017 10:24 AM
    • Replies: 0
    • Views: 148
    09-04-2017, 10:24 AM Go to last post
  5. Testing Significance of Group Differences with Non-Normal Data

    Hi.. I need help with deciding which statistical technique to use for my data My research design involves 2 Independent Variables with 2 levels each...

    Started by chhavimittal‎, 09-01-2017 07:44 AM
    manova; two-way; one-way, normality issue, normality transformation
    • Replies: 1
    • Views: 195
    09-01-2017, 08:08 AM Go to last post
  6. CI to percentage change in ICC

    I'm running fixed effects models to estimate changes in intra class correlations. I first run an unconditional model and then a second model...

    Started by joca7790‎, 08-31-2017 02:16 PM
    confidence interval, fixed effect model, icc, longitudinal analysis, multi-level analysis
    • Replies: 0
    • Views: 153
    08-31-2017, 02:16 PM Go to last post
  7. Probability of a subjective event based on historical subjective data . Forecasting

    Lately i developed an idea of understanding the behavior of kids in their childhood. I was wondering how kids are molded into different adults in no...

    Started by sree‎, 08-31-2017 03:35 AM
    • Replies: 0
    • Views: 57
    08-31-2017, 03:35 AM Go to last post
  8. vibration signal_prediction

    Hello, I have a vibration data coming from a motor. i am using R program to do the predictive analysis. My vibration data is a white noise (mean and...

    Started by dhivya‎, 08-28-2017 12:58 AM
    • Replies: 1
    • Views: 196
    08-28-2017, 02:23 PM Go to last post
  9. How to take into account different treatments, doses and starting health

    Hello all, first thread so please be kind! I have rudimentary statistics knowledge of anovas and regression but am piling through how-to videos of...

    Started by Rickyroughneck‎, 08-12-2017 03:22 PM
    2 Pages
    1 2
    logit, mixed model
    • Replies: 20
    • Views: 995
    08-21-2017, 04:06 PM Go to last post
  10. Fuzzy RDD in Stata with two cutoff points

    Dear all, i am running a Fuzzy Regression Discontinuity Design using 2SLS in Stata. My question is basically if i specified the model (and most...

    Started by HG28‎, 08-20-2017 03:02 PM
    • Replies: 0
    • Views: 195
    08-20-2017, 03:02 PM Go to last post
  11. From Pearson correlation to LMM Contribution

    Hi, I have two variables X1 and X2 which are poorly correlated (Pearson; r=0.1). Since we think the relation between X1 and X2 varies daily, I...

    Started by Meytar‎, 08-15-2017 12:20 PM
    • Replies: 2
    • Views: 172
    08-17-2017, 02:58 AM Go to last post
  12. ANOVA vs Kruskal-Wallis for combined normal and non-normal data

    I have a number of distributions that I need to determine significant differences. However, some distributions are normal and some are not. In order...

    Started by joefoy‎, 08-15-2017 02:41 PM
    kruskal-wallis anova
    • Replies: 1
    • Views: 155
    08-16-2017, 04:14 AM Go to last post
  13. Post Help regarding th topic: Shrinkage Precision Matrix Estimation with Application

    'Shrinkage Precision Matrix Estimation with Applications to Beamforming' or 'Shrinkage Estimation Precision Matrix with Applications to Beamforming'....

    Started by raksmax‎, 08-14-2017 12:46 AM
    assignment, engineering, statistics, statistics assignment
    • Replies: 1
    • Views: 171
    08-14-2017, 07:36 AM Go to last post
  14. Analysis of spread of data for numerical modelling

    Hi all, I want to firstly admit that I am not the best statistician, hence why I am here, but I will try and explain my problem as clearly as...

    Started by Nskelly‎, 08-10-2017 11:08 AM
    • Replies: 0
    • Views: 563
    08-10-2017, 11:08 AM Go to last post
  15. Correlation analysis Univariate

    Hello fellow, I recently joined the statistical forum, it is time to join as statistical-member to this forum since my carrier progress will be...

    Started by geonass‎, 08-09-2017 08:55 AM
    • Replies: 1
    • Views: 223
    08-10-2017, 08:40 AM Go to last post
  16. Statistical Tools for Analysis of Effect of Light, Temp, CO2, and pH on Growth Rate

    My question is, what may be the ideal tools to analyze the data from this experiment and what are some resources you can recommend to learn about...

    Started by wilmpat‎, 08-07-2017 12:36 PM
    biostatistics, growth rate, multivariate, plant, r code
    • Replies: 0
    • Views: 100
    08-07-2017, 12:36 PM Go to last post
  17. regression for research

    The independent variable i got is a 52x16 matrix The dependent variable i got is also a 52x16 martix what kind of regression should i establish?...

    Started by jackfrom14‎, 08-01-2017 03:16 AM
    • Replies: 2
    • Views: 344
    08-01-2017, 10:35 PM Go to last post
  18. Random Sampling - Missing Something Easy and I know it

    Hello everyone, I was asked to look over some data that came across my desk and I was stumped as to why it came out the way that it did. So the...

    Started by txsnowman‎, 07-24-2017 04:25 PM
    • Replies: 12
    • Views: 686
    07-25-2017, 11:21 AM Go to last post
  19. How to show frequency data in analysis using Spearman's Rank?

    Hello, I am interested in finding out if there is any correlation between the the values that people ascribe to certain green spaces and the land...

    Started by Nemui‎, 07-23-2017 02:18 AM
    correlation analysis, frequency data, spearman's rank
    • Replies: 0
    • Views: 287
    07-23-2017, 02:18 AM Go to last post
  20. ITIL Remedy Help Desk Incident Data - Statistical Analysis for research

    Hello, My first thread on the board. It is my hope that I am posting this to the right thread I was wondering if you could help me with a...

    Started by hayaag‎, 07-14-2017 05:19 PM
    • Replies: 11
    • Views: 622
    07-20-2017, 09:46 AM Go to last post
  21. Can sensitivity be calculated in non-binary variables?

    Hi everyone, Is there any analogous measure of sensitivity and specificity for non-binary variables? For example, if I want to study the...

    Started by AJLRB‎, 07-19-2017 03:17 AM
    • Replies: 2
    • Views: 298
    07-20-2017, 05:27 AM Go to last post
  22. Weighted values from correlation coefficients

    I've been pressed to find a similar existing example of what I'm trying to do, but maybe i'm not phrasing it incorrectly. Essentially, I want to...

    Started by booptop‎, 07-19-2017 01:35 PM
    correlation coefficient, formula, weighted
    • Replies: 0
    • Views: 216
    07-19-2017, 01:35 PM Go to last post
  23. Analysis for different data scales

    Hello everyone. I have a question that how can I perform regression/correlation or hypotheses testing on a data which has different response...

    Started by emmasood‎, 07-19-2017 09:17 AM
    • Replies: 0
    • Views: 224
    07-19-2017, 09:17 AM Go to last post
  24. Missing value imputation on a non-normal distribution - EM vs Regression? Or else?

    Hi, Bit green when it comes to some of these methods, so please be gentle... but I'll try to provide as much info and concisely as possible. Any...

    Started by itsmrjack‎, 07-17-2017 11:12 AM
    expectation-maximization, missing data, non normal distribution, regression, spss
    • Replies: 1
    • Views: 209
    07-18-2017, 07:39 AM Go to last post
  25. [Statistica - Nested Anova] How to do a two-way nested anova?

    Hi, I'm trying to do a two-way nested anova in Statistica, but the results do not seen to be a two way model. In my study I need to compare if the...

    Started by Maria Costa‎, 07-14-2017 11:45 AM
    anova, anova ecology biology, anova statistica glm, neste anova, statistica
    • Replies: 0
    • Views: 182
    07-14-2017, 11:45 AM Go to last post
  26. Modelling continuous measurements

    In the attachment from a set of notes, a brief description of how we describe a continuous measurement is described. I have a few basic questions...

    Started by Jickro‎, 07-13-2017 04:20 PM
    • Replies: 0
    • Views: 211
    07-13-2017, 04:20 PM Go to last post
  27. Post HELP! Is using cross section semi series data correct?

    Hello all! It is so nice to know that there is such a forum to discuss statistical matters. Allow me to introduce myself. My Name is Yohanes...

    Started by Yohanes115‎, 07-06-2017 03:55 AM
    • Replies: 3
    • Views: 577
    07-11-2017, 01:58 PM Go to last post
  28. Question How to report t-test, CIs, cohen's d etc of log-transformed data

    I am wondering what is best/normal practice for reporting the results of an independent t-test of log-transformed data? For context, I am...

    Started by cxds‎, 07-08-2017 07:57 AM
    back transformation, cohen's d, log transformation, reporting, t-test two-sample
    • Replies: 0
    • Views: 224
    07-08-2017, 07:57 AM Go to last post
  29. Repeated Measures Anova for individuals?

    Hey everyone - I have a data set of 50ish subjects measured weekly for 24 weeks on several physical performance variables. I'd like to evaluate if...

    Started by LCs&c‎, 07-08-2017 06:19 AM
    • Replies: 0
    • Views: 304
    07-08-2017, 06:19 AM Go to last post
  30. Sample size calculation

    I have a normal distribution: log(xi/yi) ~N (0, c^2/yi). I need to work on the posterior distribution of c^2. I know c^2 follows a gamma...

    Started by drala54@yahoo.com‎, 06-29-2017 02:35 PM
    gamma distribution, sample size calculation
    • Replies: 1
    • Views: 286
    07-07-2017, 12:19 PM Go to last post
  31. Does covariate must be observed variable?

    In my study, I found significant interactions between treatment and order of sessions. Can I put the order variable as covariate in order to control...

    Started by PsychologyS‎, 07-03-2017 04:34 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 1,179
    07-06-2017, 07:07 PM Go to last post
  32. Which test should I use in an experimental study with a questionnaire?

    Hi all, I Need some help with my first experimental study. I would like to test the influence of different variables (x1, x2...) on an individual's...

    Started by yarela‎, 06-29-2017 11:53 PM
    • Replies: 1
    • Views: 387
    06-30-2017, 08:03 AM Go to last post
  33. Explanation of the Log likelihood criterion

    Hello all, I'm a counseling doctoral student working on dissertation with a mixed methods approach (though qual dominant) Part of my...

    Started by JD89‎, 06-28-2017 07:13 PM
    • Replies: 2
    • Views: 335
    06-29-2017, 07:16 PM Go to last post
  34. Repeated Measure for data with unequal group variance -- Friedman test

    I have a small, but untidy, dataset. I think I should use non-parametric tests, but I want to check my understanding since I have not often used...

    Started by JeffP‎, 06-28-2017 07:43 PM
    • Replies: 0
    • Views: 402
    06-28-2017, 07:43 PM Go to last post
  35. Comparing an ecological subsample to population

    I have 2 batches of tree species and abundance data collected for a city. The difference between them is the sampling strategy - one was random...

    Started by andyspeak‎, 06-23-2017 08:22 AM
    braycurtis, ecology, population, sampling
    • Replies: 1
    • Views: 424
    06-26-2017, 06:01 PM Go to last post
  36. comparing test results obtained on the basis of different sample sizes

    I have variables a1 and a2 with 57 observations each, and variables b1 and b2 with 29 observations each. I compare a1 with a2 by means of a...

    Started by Wilbert‎, 06-26-2017 05:11 AM
    effect size, sample sizes, t-test
    • Replies: 0
    • Views: 260
    06-26-2017, 05:11 AM Go to last post
  37. Best tool to analyse data

    Hi, I have 20 years of data about calibration reports of various clients which primarily shows three-variables. COMPANY A YEAR 2001 1.)...

    Started by fahm‎, 06-21-2017 05:16 AM
    • Replies: 1
    • Views: 357
    06-21-2017, 10:59 AM Go to last post
  38. Sample Size Calc for Right Skewed Data

    I have a request from a person for a sample size calculation. When I requested information about the potential study data they provided two means and...

    Started by hlsmith‎, 06-09-2017 10:44 PM
    power, simulation
    • Replies: 14
    • Views: 1,308
    06-14-2017, 11:30 AM Go to last post
  39. Ridge Regression estimator

    Hi! I'm learning about the different penalized regression methods and I thought I'd stick with Ridge Regression because an analytical expression...

    Started by jamesmartinn‎, 06-12-2017 12:46 PM
    • Replies: 0
    • Views: 490
    06-12-2017, 12:46 PM Go to last post
  40. HMLR and ANOVAs instead of structural equation modelling

    Hi,* I have two studies within my thesis; The first is cross-sectional, and tests a theoretical framework of leadership - it explores the...

    Started by EmmaL‎, 06-06-2017 03:15 PM
    • Replies: 0
    • Views: 535
    06-06-2017, 03:15 PM Go to last post
  41. Question regarding methodology for Master dissertation

    Hey guys, I am a MSc Master student and am just about to write my final dissertation. Unfortunately I am a little bit unconfident with the...

    Started by CarinaSusan‎, 06-06-2017 11:31 AM
    • Replies: 0
    • Views: 361
    06-06-2017, 11:31 AM Go to last post
  42. repeated measures with covariates

    Hello, I have 2 group (sick/healthy), N=30 for each. the other variable is within- two measures time (short/ long). I want to add covariates. 1....

    Started by talgef‎, 06-05-2017 10:42 AM
    • Replies: 0
    • Views: 554
    06-05-2017, 10:42 AM Go to last post
  43. Need help figuring out which test to use!

    Hi there! I have a data file with the following information: pre-intervention depression score (t1), post-intervention depression score (t2),...

    Started by polubski‎, 06-04-2017 08:44 AM
    • Replies: 1
    • Views: 627
    06-04-2017, 11:29 AM Go to last post
  44. Within Subjects Analyses Advice

    Hi all, New user & first time poster. I'm finalizing my dissertation and am searching for similar examples as my project or some way to justify...

    Started by psychphd‎, 06-01-2017 07:12 PM
    repeated measures, repeated measures anova, within subjects
    • Replies: 0
    • Views: 743
    06-01-2017, 07:12 PM Go to last post
  45. Understanding and Calculating Credible Intervals

    Hi, I am having trouble understanding and calculating credible intervals. My goal is to understand confidence intervals vs. credible intervals. ...

    Started by bmac1‎, 05-14-2017 03:18 AM
    • Replies: 3
    • Views: 688
    06-01-2017, 06:50 PM Go to last post
  46. Post Probability from sample size

    I am working on taking a methodology class and when working on past exams I stumbled over this question. I used n=(z^2∗Var)/error^2 to obtain the...

    Started by brage‎, 05-30-2017 12:47 PM
    • Replies: 0
    • Views: 577
    05-30-2017, 12:47 PM Go to last post
  47. 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: 689
    05-29-2017, 09:00 AM Go to last post
  48. How to develop a health coverage plan for a particular disease?

    Currently, there is no government health coverage for cancer in our country and the prevalence of this disease is increasing rapidly. So I have...

    Started by Blain Waan‎, 05-27-2017 08:18 AM
    health economist, life assurance, references
    • Replies: 0
    • Views: 589
    05-27-2017, 08:18 AM Go to last post
  49. Repeated measures, cross-sectional data check

    Hey folks, Netherlands here, struggeling with my masterthesis. I conducted an repeated measures experiment with four groups and two trials. The...

    Started by dinnuk‎, 05-27-2017 05:09 AM
    • Replies: 0
    • Views: 500
    05-27-2017, 05:09 AM Go to last post
  50. Repeated measures, cross-sectional data check

    Hey folks, Netherlands here, struggeling with my masterthesis. I conducted an repeated measures experiment with four groups and two trials. The...

    Started by dinnuk‎, 05-27-2017 05:01 AM
    • Replies: 0
    • Views: 465
    05-27-2017, 05:01 AM Go to last post
  51. Wilcoxon (SL) Regression - Confidence Intervals on Parameter Estimators?

    Does anyone know of a method to create confidence intervals on the SLR parameter estimates of a Wilcoxon Regression model?

    Started by Athenaeum‎, 05-24-2017 09:28 PM
    confidence, interval, regression, wilcoxon
    • Replies: 1
    • Views: 601
    05-24-2017, 09:47 PM Go to last post
  52. Can I use fishers exact test in this situation?

    You can see in the below table that I have multiple cells that have expected counts <5 and cells with counts equal to zero + zero expected counts. As...

    Started by slamer2000‎, 05-15-2017 01:20 AM
    dichotomous, fishers exact, ordinal and categorical
    • Replies: 9
    • Views: 1,433
    05-22-2017, 08:47 PM Go to last post
  53. Linear Regression Master Thesis

    Dear all, I have a question regarding the regression method I need to apply to my research. This is only an extra method I have to apply in order...

    Started by sj13‎, 05-22-2017 07:57 AM
    • Replies: 0
    • Views: 615
    05-22-2017, 07:57 AM Go to last post
  54. Hypothesis Test for Unequal Variance When Populations are not Normally Distributed

    Hello, I have a situation where I would like to test the hypothesis that the variance of population one is great than the variance of population...

    Started by MikGZ‎, 05-17-2017 12:09 PM
    hypotheses testing, variance testing
    • Replies: 0
    • Views: 599
    05-17-2017, 12:09 PM Go to last post
  55. Question Research methodlogy

    Hi, I conducted experiments as part of a research which assumed a hypothesis regarding the behavior of participants using a system. I collected...

    Started by sandiskuser‎, 05-14-2017 12:59 PM
    • Replies: 1
    • Views: 669
    05-15-2017, 10:52 AM Go to last post
  56. Statistical method to rank Likert-items

    Dear Readers, Currently, I am conducting a study to investigate the need for assistance with a certain process. I used a survey including...

    Started by MvZ‎, 05-08-2017 04:14 AM
    likert, likert scale, preference, rank order data analysis, ranking
    • Replies: 10
    • Views: 1,277
    05-15-2017, 09:33 AM Go to last post
  57. Unbalanced designs in PERMANOVA and Resampling Methods

    Dear all, I am a new member and I have to say I am not sure if this is the right section for my question (I am working in ecology). I am...

    Started by Yser‎, 05-11-2017 06:29 AM
    bootstrap, monte carlo, permanova, unequal sample sizes
    • Replies: 1
    • Views: 570
    05-11-2017, 06:20 PM Go to last post
  58. Time required in a retrospective study

    Hello I'm describing the dispatches of a drug from a hospital pharmacy and I have the data of each one of them Between a period of two years....

    Started by veron‎, 05-10-2017 07:01 PM
    • Replies: 2
    • Views: 732
    05-11-2017, 05:25 PM Go to last post
  59. Unbalanced designs in PERMANOVA and Resampling Methods

    Dear all, I am a new member here, working mainly in Ecology. I hope this is the right section to ask my question. I am dealing with unbalanced...

    Started by Yser‎, 05-11-2017 07:16 AM
    bootstrap, permanova, unequal sample size
    • Replies: 0
    • Views: 697
    05-11-2017, 07:16 AM Go to last post
  60. meta-analysis vs. random effect combined analysis

    I have data from 200 similar studies, all measuring the same effect of a continuous independent variable on the same continuous response. I say...

    Started by szm‎, 05-10-2017 05:58 AM
    degrees of freedom, meta-analysis, mixed model, random effect, sample size
    • Replies: 0
    • Views: 670
    05-10-2017, 05:58 AM Go to last post

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