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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: 18,683
10-11-2014, 12:02 PM
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...

• Replies: 1
• Views: 100
Yesterday, 02:21 PM
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...

• Replies: 6
• Views: 229
Yesterday, 01:33 PM
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...

• Replies: 3
• Views: 162
10-16-2017, 07:58 AM
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...

• Replies: 0
• Views: 71
10-16-2017, 06:18 AM
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...

• Replies: 0
• Views: 131
10-12-2017, 06:28 AM
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...

• Replies: 2
• Views: 226
10-11-2017, 10:37 AM
7. ### 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: 192
10-10-2017, 06:26 PM
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),...

• Replies: 0
• Views: 120
10-04-2017, 08:38 AM
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....

• Replies: 0
• Views: 138
10-03-2017, 07:18 AM
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...

• Replies: 0
• Views: 115
10-02-2017, 07:55 AM
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...

• Replies: 0
• Views: 133
10-01-2017, 05:17 AM
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. ...

• Replies: 3
• Views: 226
09-29-2017, 03:59 PM
13. ### 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: 156
CRD
09-28-2017, 11:53 AM
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...

• Replies: 3
• Views: 333
09-28-2017, 02:00 AM
15. ### 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: 258
09-18-2017, 12:47 PM
16. ### 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: 437
09-06-2017, 08:35 AM
17. ### 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...

• Replies: 8
• Views: 870
09-06-2017, 01:14 AM
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...

• Replies: 0
• Views: 221
09-04-2017, 10:24 AM
19. ### 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: 210
08-31-2017, 02:16 PM
20. ### 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...

• Replies: 20
• Views: 1,078
08-21-2017, 04:06 PM
21. ### 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: 290
08-20-2017, 03:02 PM
22. ### 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: 219
08-17-2017, 02:58 AM
23. ### 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: 199
08-16-2017, 04:14 AM
24. ### 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: 216
08-14-2017, 07:36 AM
25. ### 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: 134
08-07-2017, 12:36 PM
26. ### 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: 410
08-01-2017, 10:35 PM
27. ### 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...

• Replies: 12
• Views: 852
07-25-2017, 11:21 AM
28. ### 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: 336
07-23-2017, 02:18 AM
29. ### 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: 409
07-20-2017, 05:27 AM
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...

• Replies: 0
• Views: 300
07-19-2017, 01:35 PM
31. ### 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: 300
07-19-2017, 09:17 AM
32. ### 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: 247
07-18-2017, 07:39 AM
33. ### [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: 225
07-14-2017, 11:45 AM
34. ### 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...

• Replies: 3
• Views: 691
07-11-2017, 01:58 PM
35. ### 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: 300
07-08-2017, 07:57 AM
36. ### 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: 373
07-08-2017, 06:19 AM
37. ### 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: 338
07-07-2017, 12:19 PM
38. ### 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: 438
06-30-2017, 08:03 AM
39. ### 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: 419
06-29-2017, 07:16 PM
40. ### 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: 546
06-28-2017, 07:43 PM
41. ### 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: 515
06-26-2017, 06:01 PM
42. ### 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: 305
06-26-2017, 05:11 AM
43. ### 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: 459
06-21-2017, 10:59 AM
44. ### 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...

• Replies: 14
• Views: 1,546
06-14-2017, 11:30 AM
45. ### 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: 585
06-12-2017, 12:46 PM
46. ### 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: 598
06-06-2017, 03:15 PM
47. ### 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....

• Replies: 0
• Views: 711
06-05-2017, 10:42 AM
48. ### 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),...

• Replies: 1
• Views: 793
06-04-2017, 11:29 AM
49. ### 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...

• Replies: 0
• Views: 877
06-01-2017, 07:12 PM
50. ### 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...

• Replies: 0
• Views: 700
05-30-2017, 12:47 PM

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