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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: 18,706
    10-11-2014, 12:02 PM Go to last post
  1. which statistical tests to use?

    Hi, I am very new to statistics. I have some data that I would like to perform additional statistical analysis on it. The data is related to...

    Started by lait‎, 10-17-2017 01:49 PM
    statistical analysis, statistical tests, time
    • Replies: 1
    • Views: 116
    10-17-2017, 02:21 PM Go to last post
  2. Generalised Lambda Distribution

    Hello, Can anyone help me, I am trying to use the Generalized Lambda distribution to model some parts in an assembly, but apart from Wikipedia...

    Started by GG1234‎, 10-02-2017 02:47 AM
    generalised, gld, lambda
    • Replies: 6
    • Views: 239
    10-17-2017, 01:33 PM Go to last post
  3. Meta-analysis for Pre vs Post (Which SD to use)

    Hello everyone, I have extracted data from longitudinal studies that have collected data on pre and post time points. All studies have same time...

    Started by azizfar‎, 10-16-2017 12:54 AM
    estimating sd, meta-analysis, pre vs post, sd pooled
    • Replies: 3
    • Views: 166
    10-16-2017, 07:58 AM Go to last post
  4. Average effect size between factors and within an experimental condition

    Dear all, I am interested in an average effect size between heart rate and anxiety. Anxiety is separated in 2 factors (F1 and F2), and I would...

    Started by Stabilo‎, 10-16-2017 06:18 AM
    correlated correlations, effect size, meta analysis
    • Replies: 0
    • Views: 72
    10-16-2017, 06:18 AM Go to last post
  5. Which method is correct for my tasks(methodological question)

    I have data on 80 motors, on each cycle, for each motor, different sensors give an indication. How do I suggest on the basis of this data that the...

    Started by psygrm‎, 10-12-2017 06:28 AM
    methodology
    • Replies: 0
    • Views: 134
    10-12-2017, 06:28 AM Go to last post
  6. Relevance of covariates?

    I have a big group A of individuals that have one common characteristic that make them part of a study in which certain binary variable has to be...

    Started by hebertodelrio‎, 10-07-2017 09:47 AM
    • Replies: 2
    • Views: 227
    10-11-2017, 10:37 AM Go to last post
  7. 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: 193
    10-10-2017, 06:26 PM Go to last post
  8. (URGENT!) Simulating expectations and a conditional expectation

    I need to simulate a conditional expectation of the form: E (Xi^2 /(||X||^2 +h) | R^2 = ||X-T||^2 + ||U||^2 , Zi^2= (Xi - Ti)^2) Where X~N(T,I_p),...

    Started by younes.ommane‎, 10-04-2017 08:38 AM
    conditional expectation, expectation, simulation, spherical statistics
    • Replies: 0
    • Views: 120
    10-04-2017, 08:38 AM Go to last post
  9. Need help to determine statistical method

    Dear Friends, I'm going to test that significant difference of social security measures among Pensioner, epf beneficiaries and non beneficiaries....

    Started by Ruwan85dissanyake‎, 10-03-2017 07:18 AM
    • Replies: 0
    • Views: 141
    10-03-2017, 07:18 AM Go to last post
  10. Financial Research -> Event Study (of stock prices), which Research Strategy?

    I do an Event Study to study stock price reactions to a specific event. I don't understand how this fits in the research onion: Could...

    Started by Mastauser‎, 10-02-2017 07:55 AM
    • Replies: 0
    • Views: 118
    10-02-2017, 07:55 AM Go to last post
  11. Which model/function should I choose for a variable arrival-rate ?

    Now, I need to resolve a real problem. But because of lacking of statistic knowledge, I do not know how to choose a suitable statistic model/function...

    Started by Jingzhao‎, 10-01-2017 05:17 AM
    arrival model, arrival time, arrival-rate, poisson, variable arrival-rate
    • Replies: 0
    • Views: 133
    10-01-2017, 05:17 AM Go to last post
  12. Grouping Observations

    Hello! New to the forum here and looking for help. I have 3 separate "Urban" monitoring locations. 10 observations were made at each location. ...

    Started by rs123‎, 09-28-2017 06:07 PM
    • Replies: 3
    • Views: 228
    09-29-2017, 03:59 PM Go to last post
  13. Question Which statistic should i use?

    Hello, I don't know which statistic i should use for my situation: I have 30 spaceships with different caracteristics. I need to buy one,...

    Started by CRD‎, 09-28-2017 09:59 AM
    • Replies: 3
    • Views: 159
    09-28-2017, 11:53 AM Go to last post
  14. 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: 3
    • Views: 341
    09-28-2017, 02:00 AM Go to last post
  15. A question on adjusted f effect size formula

    The F adjusted formula as I am aware is: sqrt where a is the number of conditions (a=3 for my case), N the total sample size (N=30 for my case...

    Started by Aaron Ang‎, 09-22-2017 03:31 AM
    • Replies: 0
    • Views: 191
    09-22-2017, 03:31 AM Go to last post
  16. 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: 262
    09-18-2017, 12:47 PM Go to last post
  17. 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: 439
    09-06-2017, 08:35 AM Go to last post
  18. 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: 874
    09-06-2017, 01:14 AM Go to last post
  19. 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: 224
    09-04-2017, 10:24 AM Go to last post
  20. 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: 211
    08-31-2017, 02:16 PM Go to last post
  21. 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: 102
    08-31-2017, 03:35 AM Go to last post
  22. 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: 249
    08-28-2017, 02:23 PM Go to last post
  23. 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: 1,080
    08-21-2017, 04:06 PM Go to last post
  24. 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: 295
    08-20-2017, 03:02 PM Go to last post
  25. 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: 226
    08-17-2017, 02:58 AM Go to last post
  26. 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: 201
    08-16-2017, 04:14 AM Go to last post
  27. 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: 217
    08-14-2017, 07:36 AM Go to last post
  28. 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: 1,484
    08-10-2017, 11:08 AM Go to last post
  29. 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: 283
    08-10-2017, 08:40 AM Go to last post
  30. 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: 135
    08-07-2017, 12:36 PM Go to last post
  31. 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: 412
    08-01-2017, 10:35 PM Go to last post
  32. 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: 859
    07-25-2017, 11:21 AM Go to last post
  33. 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: 337
    07-23-2017, 02:18 AM Go to last post
  34. 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: 683
    07-20-2017, 09:46 AM Go to last post
  35. 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: 414
    07-20-2017, 05:27 AM Go to last post
  36. 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: 305
    07-19-2017, 01:35 PM Go to last post
  37. 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: 301
    07-19-2017, 09:17 AM Go to last post
  38. 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: 247
    07-18-2017, 07:39 AM Go to last post
  39. [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: 225
    07-14-2017, 11:45 AM Go to last post
  40. 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: 246
    07-13-2017, 04:20 PM Go to last post
  41. 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: 696
    07-11-2017, 01:58 PM Go to last post
  42. 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: 304
    07-08-2017, 07:57 AM Go to last post
  43. 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: 378
    07-08-2017, 06:19 AM Go to last post
  44. 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: 341
    07-07-2017, 12:19 PM Go to last post
  45. 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: 1,366
    07-06-2017, 07:07 PM Go to last post
  46. 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: 439
    06-30-2017, 08:03 AM Go to last post
  47. 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: 428
    06-29-2017, 07:16 PM Go to last post
  48. 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: 548
    06-28-2017, 07:43 PM Go to last post
  49. 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: 517
    06-26-2017, 06:01 PM Go to last post
  50. 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: 307
    06-26-2017, 05:11 AM Go to last post
  51. 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: 466
    06-21-2017, 10:59 AM Go to last post
  52. 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: 1,554
    06-14-2017, 11:30 AM Go to last post
  53. 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: 586
    06-12-2017, 12:46 PM Go to last post
  54. 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: 601
    06-06-2017, 03:15 PM Go to last post
  55. 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: 459
    06-06-2017, 11:31 AM Go to last post
  56. 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: 718
    06-05-2017, 10:42 AM Go to last post
  57. 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: 806
    06-04-2017, 11:29 AM Go to last post
  58. 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: 888
    06-01-2017, 07:12 PM Go to last post
  59. 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: 852
    06-01-2017, 06:50 PM Go to last post
  60. 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: 706
    05-30-2017, 12:47 PM Go to last post

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