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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: 18,619
    10-11-2014, 12:02 PM Go to last post
  1. 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, Yesterday 06:18 AM
    correlated correlations, effect size, meta analysis
    • Replies: 0
    • Views: 56
    Yesterday, 06:18 AM Go to last post
  2. 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: 99
    08-31-2017, 03:35 AM Go to last post
  3. 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: 114
    10-02-2017, 07:55 AM Go to last post
  4. (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: 114
    10-04-2017, 08:38 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: 122
    10-12-2017, 06:28 AM Go to last post
  6. 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: 125
    10-01-2017, 05:17 AM Go to last post
  7. 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: 129
    08-07-2017, 12:36 PM Go to last post
  8. 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, Yesterday 12:54 AM
    estimating sd, meta-analysis, pre vs post, sd pooled
    • Replies: 3
    • Views: 132
    Yesterday, 07:58 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: 133
    10-03-2017, 07:18 AM Go to last post
  10. 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: 150
    09-28-2017, 11:53 AM Go to last post
  11. 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: 174
    09-22-2017, 03:31 AM Go to last post
  12. 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: 185
    10-10-2017, 06:26 PM Go to last post
  13. 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: 4
    • Views: 190
    10-09-2017, 06:19 AM Go to last post
  14. 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: 197
    08-16-2017, 04:14 AM Go to last post
  15. 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: 202
    08-31-2017, 02:16 PM Go to last post
  16. 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: 210
    08-14-2017, 07:36 AM Go to last post
  17. 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: 212
    08-17-2017, 02:58 AM Go to last post
  18. 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: 215
    09-04-2017, 10:24 AM Go to last post
  19. 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: 218
    09-29-2017, 03:59 PM Go to last post
  20. 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: 218
    10-11-2017, 10:37 AM Go to last post
  21. [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: 222
    07-14-2017, 11:45 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: 238
    08-28-2017, 02:23 PM Go to last post
  23. 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: 239
    07-13-2017, 04:20 PM 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: 245
    07-18-2017, 07:39 AM Go to last post
  25. 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: 253
    09-18-2017, 12:47 PM Go to last post
  26. 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: 275
    08-10-2017, 08:40 AM Go to last post
  27. 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: 279
    08-20-2017, 03:02 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: 289
    07-08-2017, 07:57 AM Go to last post
  29. 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: 289
    07-19-2017, 09:17 AM Go to last post
  30. 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: 292
    07-19-2017, 01:35 PM Go to last post
  31. 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: 299
    06-26-2017, 05:11 AM Go to last post
  32. 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: 327
    09-28-2017, 02:00 AM Go to last post
  33. 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: 331
    07-07-2017, 12:19 PM Go to last post
  34. 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: 331
    07-23-2017, 02:18 AM Go to last post
  35. 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: 361
    07-08-2017, 06:19 AM Go to last post
  36. 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: 393
    07-20-2017, 05:27 AM Go to last post
  37. 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: 401
    08-01-2017, 10:35 PM Go to last post
  38. 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: 404
    06-29-2017, 07:16 PM Go to last post
  39. 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: 426
    09-06-2017, 08:35 AM Go to last post
  40. 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: 433
    06-30-2017, 08:03 AM 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: 449
    06-06-2017, 11:31 AM Go to last post
  42. 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: 451
    06-21-2017, 10:59 AM Go to last post
  43. Suggest me a test

    im doing a thesis titled 'Impact of banning smartphone on employee engagement on next generation employees' h0: banning smartphone has no such...

    Started by taify‎, 05-25-2016 11:27 AM
    • Replies: 0
    • Views: 484
    05-25-2016, 11:27 AM Go to last post
  44. how to calculate the propagated error

    Hello, I have difficulties in calcuating the propagated error of my variable x and was hoping that someone knows. My variable x is calculated...

    Started by Hedwig‎, 06-26-2013 08:09 AM
    • Replies: 0
    • Views: 492
    06-26-2013, 08:09 AM Go to last post
  45. 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: 506
    06-26-2017, 06:01 PM Go to last post
  46. Please Help with SPSS tests........or I may be dismissed from my program :(

    Hi All, I am about to be dismissed from my program because I can't get my stats right on my concept paper. I hired a statistician to help me, but...

    Started by phdstudent123‎, 01-23-2012 09:36 PM
    • Replies: 0
    • Views: 508
    01-23-2012, 09:36 PM Go to last post
  47. Suggest a research design.

    I am currently doing research assignment which is to design a program evaluation and need to seek advise on some research questions. As a person...

    Started by jackfood‎, 05-17-2016 08:54 AM
    • Replies: 0
    • Views: 518
    05-17-2016, 08:54 AM Go to last post
  48. margin of error

    I have two questions as follows: *Is there a way to apply the margin of error to achieve 99.99% level of confidence? *Can I use the margin of...

    Started by eunkum‎, 04-02-2015 12:13 PM
    statistics
    • Replies: 1
    • Views: 528
    04-02-2015, 12:27 PM Go to last post
  49. What method to use for my research

    Hello all, thank you for taking the time to read this! I have the following statistics problem. I am have a small number of documents from...

    Started by henryvth‎, 04-17-2013 03:50 AM
    • Replies: 0
    • Views: 534
    04-17-2013, 03:50 AM Go to last post
  50. 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: 540
    06-28-2017, 07:43 PM Go to last post
  51. 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: 541
    07-01-2016, 04:24 AM Go to last post
  52. 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: 568
    05-27-2017, 05:01 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: 576
    06-12-2017, 12:46 PM Go to last post
  54. standardize by population density

    I have a variable called "number of events" for each state. It is a raw number of event that happened during a specific time frame. I was thinking I...

    Started by grayskillen‎, 04-11-2016 09:57 AM
    population, rates, standardization
    • Replies: 0
    • Views: 585
    04-11-2016, 09:57 AM Go to last post
  55. 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: 594
    06-06-2017, 03:15 PM Go to last post
  56. Lightbulb Using standard deviation on two mean values of two different instruments

    Hi all, I'm making a research and doing a final data analysis. The research was undertaken using a questionnaire and then structured interviews....

    Started by oraclepilot‎, 01-14-2016 01:49 PM
    • Replies: 0
    • Views: 618
    01-14-2016, 01:49 PM Go to last post
  57. Question help needed urgently for my dissertation what analysis method do i use

    hi i urgently need some help to do results section of my dissertation as it due soon by early may what analysis do i use and how do i interpret...

    Started by psychelp‎, 04-24-2017 09:08 AM
    please help me on this
    • Replies: 0
    • Views: 618
    04-24-2017, 09:08 AM Go to last post
  58. SPSS Correlation of single variable and independent variables

    Hello, I am working in spss 23 and I'm stuck. I have data for which I am attempting to determine if certain color of a personality (there are 4...

    Started by kellytwilliams‎, 04-21-2017 11:01 AM
    correlation analysis, spss 23
    • Replies: 3
    • Views: 622
    04-22-2017, 02:48 AM Go to last post
  59. 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: 641
    05-17-2017, 12:09 PM Go to last post
  60. Smile [SPSS - Hypothesis testing] Controlling for a variable. ANCOVA?

    Hi! I am using open data from New York City's yellow cabs and the in 2013 introduced citibikes (bikesharing service) to see if the introduction of...

    Started by dippedinice‎, 05-12-2016 03:18 PM
    hypothesis testing, spss
    • Replies: 0
    • Views: 644
    05-12-2016, 03:18 PM Go to last post

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