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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: 19,426
10-11-2014, 12:02 PM
1. ### Time Series or GARCH? Can't decide..

Hello, for a research thesis I want to compare returns of different asset classes with another. Think: stock indices, bond indices, a commodity...

• Replies: 3
• Views: 1,904
09-18-2016, 09:24 AM
2. ### Can I use gls if I don't need to use mixed models and var is not structured?

I have a continuous variable that is related to a covariable linearly. I need to compare this relationship between months (24 months), but the...

• Replies: 5
• Views: 1,927
09-14-2016, 04:01 PM
3. ### Comparing two datasets in terms of anonymisation

Hi guys, hope you are doing good! I have quite the conundrum; I'm trying to figure out different ways I can cross-examine two datasets (D1 and...

• Replies: 0
• Views: 1,583
09-13-2016, 03:07 AM
4. ### Gage R&R results to usable data

This is for my thesis & i'm stumped. Please help. A Gage R&R was done comparing two inspection tools to each other. These tools measure the section...

• Replies: 1
• Views: 1,381
09-12-2016, 04:21 AM
5. ### Monte Carlo for Weibull and Lognornam distributions in R

I am involved in a project which needs statistic and computer science. I am more of a computer guy so I appreciate any statistical help. I am doing...

• Replies: 3
• Views: 1,413
09-12-2016, 03:26 AM
6. ### repeated cross sectional-partially changed study population

I have a large dataset (n=11804) that includes data from a cross sectional study conducted in 2013, 2014 and 2015 in patients in nursing homes...so...

• Replies: 0
• Views: 707
09-09-2016, 03:33 AM
7. ### How to determine if two R2 values (rsquared) are significantly different

Hi TalkStats :):):) I have fit two different functions (f1,f2) to some data. These functions have different forms (see below), in that they have...

• Replies: 4
• Views: 2,417
09-08-2016, 12:28 PM
8. ### Quasi-experiments and variable manipulation

Hello, I am new here so forgive me if I seem amateur, After doing a lot of research and discussion with other students I have continued to find...

• Replies: 0
• Views: 1,466
09-08-2016, 12:25 AM
9. ### [Finite population correction(FPC)] Did I discover “FPC(nHr)”?

talkstats members are knowledgeable. Anybody knows there is any precursor already published FPC(H^n_r). The journals rejected my paper. Finite...

• Replies: 3
• Views: 2,249
09-07-2016, 09:09 AM
10. ### HELP - citation model in R

Hello everyone. I need help with the citation model as explained in This article "Bibliometric tools applied to analytical articles: the example...

• Replies: 3
• Views: 1,961
09-05-2016, 09:04 AM
11. ### Population estimation

Hi, Just would like to ask for some of your valuable advice! I am working on the project which would like to use the small sample to estimate...

• Replies: 3
• Views: 1,168
09-03-2016, 08:47 AM
12. ### Bayesian analysis of logistic dependent variable, with between and within subjects in

I have a dataset consisting of two groups of participants (25 participants in one group and 26 in the other), with each participating in two...

• Replies: 0
• Views: 769
09-01-2016, 02:19 AM
13. ### comparing multiple means between multiple groups

Hi Everyone, Pretty new to stats and want to make sure that I am running the right stats. I have means (measured in months) from multiple...

• Replies: 0
• Views: 826
08-30-2016, 12:28 PM
14. ### Calculate sample size?

You are interested in studying the relationship between sodium consumption and the development of hypertension. 32% of Americans are hypertensive...

• Replies: 0
• Views: 1,071
08-29-2016, 11:28 PM
15. ### Probability equation X > number

Long time lurker, first time poster! All help much appreciated! I have one equation being compared to a number: X = any positive real number ...

• Replies: 3
• Views: 1,351
08-29-2016, 07:21 PM
16. ### Zero vs missing data

Hello I have a question regarding 0 (=zero) vs missing data. If I have an observation that have many variables but one of the variable is not...

• Replies: 3
• Views: 1,115
08-29-2016, 03:12 AM
17. ### What type of ANOVA test should I do?

The same participants are exposed to two different screen sizes 27" (stimulus A) and screen size 9.7" (stimulus B). Independent var is "screen" with...

• Replies: 3
• Views: 1,373
08-28-2016, 07:31 PM
18. ### Stuggling with choosing the correct test.

So I am analyzing data for a student outside of my department. They are looking to see the differences in exam scores between two different methods...

• Replies: 9
• Views: 2,043
08-27-2016, 01:11 PM
19. ### Change over time

Hi all, I am looking at patient activity for a disease and have patient numbers for 5 years (2009-2013). I have numbers for 4 different types: ...

• Replies: 2
• Views: 847
08-26-2016, 06:55 PM
20. ### split-split plot with continuous subplot variable

Hello I am trying to analyze data from a split-split-plot design. The sub-plot is a continuous factor and since we suspect a non-linear...

• Replies: 1
• Views: 988
szm
08-26-2016, 06:44 AM
21. ### chi-square test for nested models

Consider 2 models A and B. A (5 free parameters) is nested within B (6 free parameters). Imagine that we do an experiment and acquire data from N =...

• Replies: 2
• Views: 1,637
08-25-2016, 11:00 PM
22. ### What tests and analysis for 50 year data collected on fashion trends

So, it is said that whatever is in fashion once comes back someday or the other. We have collected data on 10 different garment types, each having 5...

• Replies: 1
• Views: 771
08-25-2016, 10:31 AM
23. ### How does one develop statistical models to compensate for weakness in public data?

Hi everyone. I have an interview coming up and the role is data centric. I have a strong knowledge of data and management, however I have never...

• Replies: 7
• Views: 1,186
08-24-2016, 11:08 AM
24. ### Bhattacharyya metric as a chi-squared type statistic

Hi all, I'm reading about the relation between the Bhattacharyya metric and the chi-squared metric:...

• Replies: 0
• Views: 821
08-21-2016, 05:47 PM
25. ### Appropriate sample size for unusual "populations"

There seems to be a lot of literature about determining sample size based on population, margin of error and confidence level. This seems difficult...

• Replies: 2
• Views: 945
08-16-2016, 08:22 PM
26. ### Which statistical model to choose?

Hey guys, I have a few hypotheses in a randomized control trial that I would like to test: 1) Effect of a treatment on several outcome...

• Replies: 0
• Views: 909
08-15-2016, 12:58 PM
27. ### HELP- Cumulative meta-analyses conceptual question!

Hi, Based on the premise that cumulative meta-analysis is a "chronological combining of the experiments will show if there is a consistency in the...

• Replies: 1
• Views: 1,381
08-14-2016, 08:52 PM
28. ### Sig diff means - likert scale and multiple variables

Hi, I have a dataset of 100 survey responses. The survey asked respondents how frequently they engaged in certain leadership behaviours. There...

• Replies: 1
• Views: 1,213
08-13-2016, 09:03 AM
29. ### Name That Model!

Keywords: OLS, WLS, GLM, GzLM, Heteroscedasticity , Assumptions, Residuals, Errors Hullo I have been working full time and studying part time...

• Replies: 7
• Views: 1,950
08-05-2016, 04:22 PM
30. ### Box's Test after outlier Removal

Hello everyone, I have searched the forum and couldn't find an answer, so I figured I would start a new thread. I am running a 1-way MANOVA for...

• Replies: 0
• Views: 1,341
08-02-2016, 01:58 PM
31. ### Measuring effect - urgent

Hi Guys, For my thesis, I am researching the influence of colour (IV) on product attractiveness (DV). Respondents in my experiment choose one of 7...

• Replies: 8
• Views: 1,993
08-01-2016, 01:05 PM
32. ### Reporting effect size/post hocs when not significant- rigorous alpha

Hello, I have received my manuscript back from reviewers who have suggested that I report Cohen's d for differences found between three groups. ...

• Replies: 1
• Views: 1,200
08-01-2016, 08:08 AM
33. ### Testing for trend in a r*c table, in STATA which method should I use?

I have searched for multiple websites, and only found the information regarding how to test the trend in a 2*k table, which was not the exact...

• Replies: 0
• Views: 930
07-29-2016, 02:04 PM
34. ### Studies Quality Assesment: interpreted univariate analysis, adjusted for confounding?

Hello, I am conducting a systematic review on mostly cohort studies. One part of my quality assessment is of course; if the observational study...

• Replies: 0
• Views: 998
07-25-2016, 08:35 AM
35. ### Good sources (books, articles, ....) on the history of Monte Carlo methods?

I am finally entering the final step of my PhD. Chapter 1 of my dissertation has already been published, Chapter 2 has been submitted for publication...

• Replies: 4
• Views: 2,634
07-22-2016, 05:38 AM
36. ### Bivariate Contour Ellipse Area

I have found a research paper, where there is need to calculate the area of a bivariate contour ellipse. I am familiar with drawing a confidence...

• Replies: 0
• Views: 3,812
07-21-2016, 07:25 AM
37. ### Correct statistical test to compare multiple rates

Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the...

• Replies: 0
• Views: 1,055
07-20-2016, 03:38 PM
38. ### Unbalanced samples

Hi! I want to compare between two sample, but they have non equivalent means between demographic parameters such as age and more. What do you...

• Replies: 1
• Views: 1,443
07-18-2016, 08:12 AM
39. ### Estimating the number of cases (sample size)

Hi there! I've a perhaps simple question: how can I estimate the number of measurements (cases) to obtain a accurate result? Here an example:...

• Replies: 6
• Views: 1,464
07-17-2016, 11:00 PM
40. ### Multiple Measures (Different Variables) from Same Subjects

Hi all! This is my first post. I hope someone can offer advice! I have a student with a seemingly simple analytical problem but I cannot...

• Replies: 2
• Views: 840
07-17-2016, 10:44 AM
41. ### Repeated measures - Within/Between explained

Hey guys, I'm having troubles understanding my analysis. I have patients going through pulmonary functions test every 2 weeks in 5 different time...

• Replies: 3
• Views: 1,696
07-16-2016, 08:58 AM
42. ### Dealing with missing values in cluster analysis

I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

• Replies: 5
• Views: 1,284
07-16-2016, 06:53 AM
43. ### Bonferroni correction (significance level and CI)

Hi there, I need another advice. I'm dealing with the problem of multiple testing and I was planning to use Bonferroni correction. Because I...

• Replies: 1
• Views: 2,176
07-14-2016, 07:53 AM
44. ### Goodness of fit test for categorical data with non-negative real numbersca

An experiment that I conduct has 5 outcomes: A, B, C and D. I conduct 12 trials for this experiment. I observe, for example: Outcome : Frequency...

• Replies: 2
• Views: 1,620
07-14-2016, 01:13 AM
45. ### What happens after Content Analysis and Cohen's Kappa?

Hi I have 2 raters for content analysis and have a satisfactory score for Cohen's Kappa (0.805). Can I use either raters' values for analysis or...

• Replies: 1
• Views: 812
07-14-2016, 01:09 AM
46. ### Re: what is the best test

Dear all, I am analysing the data set with two independent variables (syntax, position), two levels each, affecting children's performance on the...

• Replies: 1
• Views: 1,016
07-14-2016, 01:08 AM
47. ### Discrete or Continuous Data and Effect Size

Dear All, I have a paper with baseline (expressed as median and IQR) and change scores at 12 months (mean, 95%CI) regarding the number of days per...

• Replies: 0
• Views: 1,116
07-12-2016, 02:47 PM
48. ### what is the best test

Hello! I'm not the best at statistics. I understand the theory but I am still uncertain about choosing the appropriate test. I am doing a study...

• Replies: 1
• Views: 1,375
07-09-2016, 04:38 PM
49. ### Influence of a person in repeat measurement (multilevel) or longitudinal data

Hey, I have a dataset of 50 people with 4 responses over the year. Responses were a 5-point Likert scale collapsed into a binary variable (0,1)....

• Replies: 3
• Views: 1,165
07-08-2016, 11:23 AM
50. ### Model vs. test

Hi, we just had an interesting discussion about the chi-squared test, that could be generalized. I think the core of the discussion was whether one...

• Replies: 1
• Views: 1,123
07-07-2016, 09:32 AM
51. ### Identifying the right way to establish correlations between different topics

I have multiple topics each with hundreds of questions and different students submitting responses to these questions. What is the best way to...

• Replies: 0
• Views: 908
07-02-2016, 03:56 AM
52. ### Poisson process

Dear statisticians, I have a question that is of great importance for my master thesis in insurance science. I have obtained a dataset that...

• Replies: 2
• Views: 1,053
07-01-2016, 02:08 PM
53. ### 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: 585
07-01-2016, 04:24 AM
54. ### Analyzing Likert Scale Data Using Statistical Tools

Hi everyone, I'm doing an MBA dissertation on the topic "Impact of Customer Service Satisfaction on Business Performance". The hypothesis set is...

• Replies: 3
• Views: 1,742
06-29-2016, 01:50 AM
55. ### Gamma distribution

Hi, If I have three independent variables that all follow the gamma distribution, what distribution will then sum of these variables follow? ...

• Replies: 0
• Views: 1,007
06-28-2016, 02:56 AM
56. ### How i can analyse two questionnaires to find the Reliability Coefficient

I am working on a project in which i am comparing Public and Private schools performance for that I have to compare the data on SPSS to find the...

• Replies: 0
• Views: 1,812
06-26-2016, 04:35 PM

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