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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: 19,431
    10-11-2014, 12:02 PM Go to last post
  1. Moderated Mediation Interpretation in Process (Model 7)

    Hi all, I hope my question has not been asked yet. I ran a moderated mediation using the Process macro (Model 7) in SPSS. My moderator is a...

    Started by Bastien‎, 11-17-2017 06:38 AM
    • Replies: 0
    • Views: 102
    11-17-2017, 06:38 AM Go to last post
  2. Failed Assumptions for a Two-Way Manova

    My dataset from an archival data source has failed to meet assumptions. Here's a paragraph from my dissertation. The Kolmogorov-Smirnov test of...

    Started by abelltx‎, 10-29-2017 09:19 AM
    • Replies: 1
    • Views: 201
    11-13-2017, 07:13 PM Go to last post
  3. binary variables as random effects in a GLMM (mixed models)

    I have a pretty simple question. Is it worth including a binary variable as a random effect within a mixed effect model? For example, the fixed...

    Started by the42up‎, 11-13-2017 05:14 PM
    • Replies: 0
    • Views: 93
    11-13-2017, 05:14 PM Go to last post
  4. Correlation between Platelet Count and Mean Platelet Volume? Correct Stat analysis?

    I have attached my statistical analysis in this thread. It is about correlation between platelet count and mean platelet volume. I am conducting a...

    Started by IceFeast‎, 11-07-2017 11:37 PM
    • Replies: 0
    • Views: 151
    11-07-2017, 11:37 PM Go to last post
  5. WHich post-hoc test?

    Hi - I am a stats novice trying to find my way through my masters research. I have results that show a statistically significant relationship between...

    Started by nzidesigner‎, 11-02-2017 07:49 PM
    post hoc tests
    • Replies: 4
    • Views: 243
    11-02-2017, 09:48 PM Go to last post
  6. Exclamation Calculating sample size for non-inferiority trial using Stata cii

    Hi, can I use Stata command cii to calculate the sample size required if I want to test that fasting TG is not lower than non-fasting TG by...

    Started by kohyle‎, 11-01-2017 10:36 PM
    • Replies: 2
    • Views: 168
    11-02-2017, 04:19 PM Go to last post
  7. Significance between ratios?

    I'm performing a survival analysis where I compare between 2 conditions in one cell type (cell type 1) vs two conditions in the other (cell type 2)....

    Started by LostInP‎, 11-01-2017 11:18 AM
    biology, survival analysis
    • Replies: 1
    • Views: 123
    11-01-2017, 11:40 AM Go to last post
  8. Adjusted residuals Chi square - Interpretation correct?

    Hello! I'm looking for help with a chi-square independence test. I carried out this test to check if there was an association between X & Y (both...

    Started by benjacar‎, 10-29-2017 05:18 PM
    • Replies: 0
    • Views: 156
    10-29-2017, 05:18 PM Go to last post
  9. Please help me select the appropriate test for my analysis

    Hi, I have a within-subjects experimental design that features 2 independent factors: (driving condition - 2 levels, sound type - 4 levels), and 1...

    Started by davidbeattie‎, 10-29-2017 02:26 PM
    multinomial logit
    • Replies: 1
    • Views: 142
    10-29-2017, 04:14 PM Go to last post
  10. Graduate School Help - What test do I run?

    I am working on my independent action research project and need help figuring out what statistical test to use. I am looking at how my students'...

    Started by caryteacher527‎, 10-27-2017 09:16 AM
    group comparison, statistical test
    • Replies: 1
    • Views: 170
    10-28-2017, 11:21 AM Go to last post
  11. Calculating sample size with adequate power to validate a scale?

    Hello All, I am having some difficulty trying to calculate the power and to also determine an adequate sample size for a study looking to...

    Started by mouak‎, 10-27-2017 09:58 AM
    • Replies: 1
    • Views: 161
    10-28-2017, 11:17 AM Go to last post
  12. comparing means

    I have collected attention data from two different groups. for the first group (14 people), I measured attention (dependent variable) for 7 different...

    Started by nazila‎, 10-27-2017 11:11 PM
    • Replies: 1
    • Views: 125
    10-28-2017, 11:13 AM Go to last post
  13. Cohen's D, Standard Normal Equivalient, Non-Inferiority

    Let us see if writing this out helps me wrap my mind around it, that or maybe you all will come to the rescue. I have two samples (represented...

    Started by hlsmith‎, 10-26-2017 09:42 PM
    • Replies: 0
    • Views: 113
    10-26-2017, 09:42 PM Go to last post
  14. HELP Dissertation Research - Which Statistical Test Do I Use?

    Hi, I'm currently completing my Dissertation paper and I'm stumped on which statistical test I should be using!. I have 30 completed...

    Started by alexfinch89‎, 10-22-2017 09:56 PM
    • Replies: 5
    • Views: 303
    10-25-2017, 03:15 AM Go to last post
  15. Cohen d and Z scores

    Hi everyone, I should start by saying that I posted the same question that I will expose here on the psychological research forum. However, as I...

    Started by css‎, 10-24-2017 05:37 AM
    effect size, z score
    • Replies: 5
    • Views: 224
    10-24-2017, 01:46 PM Go to last post
  16. how to deal with missing values ?

    I have around 80 measurements done for 30 participants over 10 different time points. There is some missing data: 1- some participants have...

    Started by lait‎, 10-23-2017 01:21 PM
    missing values
    • Replies: 1
    • Views: 135
    10-23-2017, 03:05 PM Go to last post
  17. 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: 7
    • Views: 396
    10-23-2017, 03:00 AM Go to last post
  18. 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: 400
    10-17-2017, 02:21 PM Go to last post
  19. 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: 310
    10-16-2017, 07:58 AM Go to last post
  20. 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: 135
    10-16-2017, 06:18 AM Go to last post
  21. 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: 214
    10-12-2017, 06:28 AM Go to last post
  22. 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: 333
    10-11-2017, 10:37 AM Go to last post
  23. 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: 378
    10-10-2017, 06:26 PM Go to last post
  24. (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: 170
    10-04-2017, 08:38 AM Go to last post
  25. 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: 281
    10-03-2017, 07:18 AM Go to last post
  26. 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: 174
    10-02-2017, 07:55 AM Go to last post
  27. 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: 193
    10-01-2017, 05:17 AM Go to last post
  28. 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: 370
    09-29-2017, 03:59 PM Go to last post
  29. 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: 268
    09-28-2017, 11:53 AM Go to last post
  30. 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: 452
    09-28-2017, 02:00 AM Go to last post
  31. 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: 322
    09-22-2017, 03:31 AM Go to last post
  32. 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: 376
    09-18-2017, 12:47 PM Go to last post
  33. 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: 590
    09-06-2017, 08:35 AM Go to last post
  34. 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: 1,102
    09-06-2017, 01:14 AM Go to last post
  35. 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: 364
    09-04-2017, 10:24 AM Go to last post
  36. 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: 363
    08-31-2017, 02:16 PM Go to last post
  37. 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: 166
    08-31-2017, 03:35 AM Go to last post
  38. 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: 359
    08-28-2017, 02:23 PM Go to last post
  39. 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: 1,241
    08-21-2017, 04:06 PM Go to last post
  40. 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: 503
    08-20-2017, 03:02 PM Go to last post
  41. 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: 344
    08-17-2017, 02:58 AM Go to last post
  42. 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: 270
    08-16-2017, 04:14 AM Go to last post
  43. 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: 274
    08-14-2017, 07:36 AM Go to last post
  44. 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: 2,338
    08-10-2017, 11:08 AM Go to last post
  45. 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: 402
    08-10-2017, 08:40 AM Go to last post
  46. 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: 197
    08-07-2017, 12:36 PM Go to last post
  47. 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: 520
    08-01-2017, 10:35 PM Go to last post
  48. 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: 1,114
    07-25-2017, 11:21 AM Go to last post
  49. 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: 391
    07-23-2017, 02:18 AM Go to last post
  50. 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: 795
    07-20-2017, 09:46 AM Go to last post
  51. 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: 583
    07-20-2017, 05:27 AM Go to last post
  52. 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: 479
    07-19-2017, 01:35 PM Go to last post
  53. 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: 513
    07-19-2017, 09:17 AM Go to last post
  54. 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: 315
    07-18-2017, 07:39 AM Go to last post
  55. [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: 293
    07-14-2017, 11:45 AM Go to last post
  56. 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: 340
    07-13-2017, 04:20 PM Go to last post
  57. 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: 940
    07-11-2017, 01:58 PM Go to last post
  58. 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: 420
    07-08-2017, 07:57 AM Go to last post
  59. 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: 520
    07-08-2017, 06:19 AM Go to last post
  60. 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: 463
    07-07-2017, 12:19 PM Go to last post

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