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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: 19,470
10-11-2014, 12:02 PM
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...

• Replies: 0
• Views: 117
11-17-2017, 06:38 AM
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...

• Replies: 1
• Views: 213
11-13-2017, 07:13 PM
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...

• Replies: 0
• Views: 93
11-13-2017, 05:14 PM
4. ### 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...

• Replies: 4
• Views: 249
11-02-2017, 09:48 PM
5. ### 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)....

• Replies: 1
• Views: 127
11-01-2017, 11:40 AM

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

• Replies: 1
• Views: 144
10-29-2017, 04:14 PM
7. ### 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'...

• Replies: 1
• Views: 171
10-28-2017, 11:21 AM
8. ### 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...

• Replies: 1
• Views: 162
10-28-2017, 11:17 AM
9. ### 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...

• Replies: 1
• Views: 127
10-28-2017, 11:13 AM
10. ### 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...

• Replies: 0
• Views: 115
10-26-2017, 09:42 PM
11. ### 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...

• Replies: 5
• Views: 231
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10-24-2017, 01:46 PM
12. ### 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...

• Replies: 1
• Views: 136
10-23-2017, 03:05 PM
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...

• Replies: 7
• Views: 403
10-23-2017, 03:00 AM
14. ### 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: 402
10-17-2017, 02:21 PM
15. ### 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: 313
10-16-2017, 07:58 AM
16. ### 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: 135
10-16-2017, 06:18 AM
17. ### 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: 214
10-12-2017, 06:28 AM
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: 338
10-11-2017, 10:37 AM
19. ### 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: 386
10-10-2017, 06:26 PM
20. ### (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: 172
10-04-2017, 08:38 AM
21. ### 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: 281
10-03-2017, 07:18 AM
22. ### 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: 175
10-02-2017, 07:55 AM
23. ### 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: 193
10-01-2017, 05:17 AM
24. ### 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: 375
09-29-2017, 03:59 PM
25. ### 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: 274
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09-28-2017, 11:53 AM
26. ### 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: 456
09-28-2017, 02:00 AM
27. ### 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: 379
09-18-2017, 12:47 PM
28. ### 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: 595
09-06-2017, 08:35 AM
29. ### 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: 1,116
09-06-2017, 01:14 AM
30. ### 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: 365
09-04-2017, 10:24 AM
31. ### 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: 367
08-31-2017, 02:16 PM
32. ### 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: 1,247
08-21-2017, 04:06 PM
33. ### 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: 517
08-20-2017, 03:02 PM
34. ### 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: 353
08-17-2017, 02:58 AM
35. ### 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: 270
08-16-2017, 04:14 AM
36. ### 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: 275
08-14-2017, 07:36 AM
37. ### 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: 200
08-07-2017, 12:36 PM
38. ### 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: 525
08-01-2017, 10:35 PM
39. ### 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: 1,129
07-25-2017, 11:21 AM
40. ### 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: 393
07-23-2017, 02:18 AM
41. ### 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: 590
07-20-2017, 05:27 AM
42. ### 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: 485
07-19-2017, 01:35 PM
43. ### 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: 539
07-19-2017, 09:17 AM
44. ### 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: 316
07-18-2017, 07:39 AM
45. ### [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: 295
07-14-2017, 11:45 AM
46. ### 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: 954
07-11-2017, 01:58 PM
47. ### 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: 422
07-08-2017, 07:57 AM
48. ### 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: 525
07-08-2017, 06:19 AM
49. ### 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: 467
07-07-2017, 12:19 PM

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