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# Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

1. ### 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...

• Replies: 14
• Views: 18,619
10-11-2014, 12:02 PM
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...

• Replies: 0
• Views: 56
Yesterday, 06:18 AM
2. ### 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...

• Replies: 0
• Views: 114
10-02-2017, 07:55 AM
3. ### (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),...

• Replies: 0
• Views: 114
10-04-2017, 08:38 AM
4. ### 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...

• Replies: 0
• Views: 122
10-12-2017, 06:28 AM
5. ### 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...

• Replies: 0
• Views: 125
10-01-2017, 05:17 AM
6. ### 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...

• Replies: 0
• Views: 129
08-07-2017, 12:36 PM
7. ### 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...

• Replies: 3
• Views: 132
Yesterday, 07:58 AM
8. ### 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....

• Replies: 0
• Views: 133
10-03-2017, 07:18 AM
9. ### 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,...

• Replies: 3
• Views: 150
CRD
09-28-2017, 11:53 AM
10. ### 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...

• Replies: 4
• Views: 185
10-10-2017, 06:26 PM
11. ### 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...

• Replies: 4
• Views: 190
10-09-2017, 06:19 AM
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...

• Replies: 1
• Views: 197
08-16-2017, 04:14 AM
13. ### 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...

• Replies: 0
• Views: 202
08-31-2017, 02:16 PM
14. ### 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'....

• Replies: 1
• Views: 210
08-14-2017, 07:36 AM
15. ### 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...

• Replies: 2
• Views: 212
08-17-2017, 02:58 AM
16. ### 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...

• Replies: 0
• Views: 215
09-04-2017, 10:24 AM
17. ### 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. ...

• Replies: 3
• Views: 218
09-29-2017, 03:59 PM
18. ### 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...

• Replies: 2
• Views: 218
10-11-2017, 10:37 AM
19. ### [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...

• Replies: 0
• Views: 222
07-14-2017, 11:45 AM
20. ### 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...

• Replies: 1
• Views: 245
07-18-2017, 07:39 AM
21. ### 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...

• Replies: 0
• Views: 253
09-18-2017, 12:47 PM
22. ### 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...

• Replies: 0
• Views: 279
08-20-2017, 03:02 PM
23. ### 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...

• Replies: 0
• Views: 289
07-08-2017, 07:57 AM
24. ### 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...

• Replies: 0
• Views: 289
07-19-2017, 09:17 AM
25. ### 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...

• Replies: 0
• Views: 292
07-19-2017, 01:35 PM
26. ### 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...

• Replies: 0
• Views: 299
06-26-2017, 05:11 AM
27. ### 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...

• Replies: 3
• Views: 327
09-28-2017, 02:00 AM
28. ### 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...

• Replies: 1
• Views: 331
07-07-2017, 12:19 PM
29. ### 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...

• Replies: 0
• Views: 331
07-23-2017, 02:18 AM
30. ### 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...

• Replies: 0
• Views: 361
07-08-2017, 06:19 AM
31. ### 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...

• Replies: 2
• Views: 393
07-20-2017, 05:27 AM
32. ### 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?...

• Replies: 2
• Views: 401
08-01-2017, 10:35 PM
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...

• Replies: 2
• Views: 404
06-29-2017, 07:16 PM
34. ### 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...

• Replies: 1
• Views: 426
09-06-2017, 08:35 AM
35. ### 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...

• Replies: 1
• Views: 433
06-30-2017, 08:03 AM
36. ### 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.)...

• Replies: 1
• Views: 451
06-21-2017, 10:59 AM
37. ### 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...

• Replies: 0
• Views: 484
05-25-2016, 11:27 AM
38. ### 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...

• Replies: 0
• Views: 492
06-26-2013, 08:09 AM
39. ### 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...

• Replies: 1
• Views: 506
06-26-2017, 06:01 PM

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...

• Replies: 0
• Views: 508
01-23-2012, 09:36 PM
41. ### 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...

• Replies: 0
• Views: 518
05-17-2016, 08:54 AM
42. ### 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...

• Replies: 1
• Views: 528
04-02-2015, 12:27 PM
43. ### 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...

• Replies: 0
• Views: 534
04-17-2013, 03:50 AM
44. ### 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...

• Replies: 0
• Views: 540
06-28-2017, 07:43 PM
45. ### 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...

• Replies: 0
• Views: 541
07-01-2016, 04:24 AM
46. ### 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...

• Replies: 0
• Views: 568
05-27-2017, 05:01 AM
47. ### 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...

• Replies: 0
• Views: 576
06-12-2017, 12:46 PM
48. ### 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...

• Replies: 0
• Views: 585
04-11-2016, 09:57 AM
49. ### 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...

• Replies: 0
• Views: 594
06-06-2017, 03:15 PM
50. ### 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....

• Replies: 0
• Views: 618
01-14-2016, 01:49 PM
51. ### 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...

• Replies: 0
• Views: 618
04-24-2017, 09:08 AM
52. ### 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...

• Replies: 3
• Views: 622
04-22-2017, 02:48 AM
53. ### 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...

• Replies: 0
• Views: 641
05-17-2017, 12:09 PM
54. ### [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...

• Replies: 0
• Views: 644
05-12-2016, 03:18 PM

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