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05-10-2017
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Threads 61 to 120 of 3209

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: 19,403
10-11-2014, 12:02 PM
1. 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: 506
06-30-2017, 08:03 AM
2. 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: 589
06-29-2017, 07:16 PM
3. 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: 645
06-28-2017, 07:43 PM
4. 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: 622
06-26-2017, 06:01 PM
5. 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: 370
06-26-2017, 05:11 AM
6. 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: 618
06-21-2017, 10:59 AM
7. 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: 1,885
06-14-2017, 11:30 AM
8. 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: 682
06-12-2017, 12:46 PM
9. 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: 643
06-06-2017, 03:15 PM
10. 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: 930
06-05-2017, 10:42 AM
11. 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: 1,068
06-04-2017, 11:29 AM

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: 1,068
06-01-2017, 07:12 PM
13. 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: 867
05-30-2017, 12:47 PM
14. How to develop a health coverage plan for a particular disease?

Currently, there is no government health coverage for cancer in our country and the prevalence of this disease is increasing rapidly. So I have...

• Replies: 0
• Views: 811
05-27-2017, 08:18 AM
15. 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: 894
05-27-2017, 05:09 AM
16. 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: 695
05-27-2017, 05:01 AM
17. Wilcoxon (SL) Regression - Confidence Intervals on Parameter Estimators?

Does anyone know of a method to create confidence intervals on the SLR parameter estimates of a Wilcoxon Regression model?

• Replies: 1
• Views: 832
05-24-2017, 09:47 PM
18. Can I use fishers exact test in this situation?

You can see in the below table that I have multiple cells that have expected counts <5 and cells with counts equal to zero + zero expected counts. As...

• Replies: 9
• Views: 2,238
05-22-2017, 08:47 PM
19. Linear Regression Master Thesis

Dear all, I have a question regarding the regression method I need to apply to my research. This is only an extra method I have to apply in order...

• Replies: 0
• Views: 871
05-22-2017, 07:57 AM
20. 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: 693
05-17-2017, 12:09 PM
21. Research methodlogy

Hi, I conducted experiments as part of a research which assumed a hypothesis regarding the behavior of participants using a system. I collected...

• Replies: 1
• Views: 943
05-15-2017, 10:52 AM
22. Statistical method to rank Likert-items

Dear Readers, Currently, I am conducting a study to investigate the need for assistance with a certain process. I used a survey including...

• Replies: 10
• Views: 1,604
05-15-2017, 09:33 AM
23. Unbalanced designs in PERMANOVA and Resampling Methods

Dear all, I am a new member and I have to say I am not sure if this is the right section for my question (I am working in ecology). I am...

• Replies: 1
• Views: 846
05-11-2017, 06:20 PM
24. Time required in a retrospective study

Hello I'm describing the dispatches of a drug from a hospital pharmacy and I have the data of each one of them Between a period of two years....

• Replies: 2
• Views: 983
05-11-2017, 05:25 PM
25. Unbalanced designs in PERMANOVA and Resampling Methods

Dear all, I am a new member here, working mainly in Ecology. I hope this is the right section to ask my question. I am dealing with unbalanced...

• Replies: 0
• Views: 1,060
05-11-2017, 07:16 AM
26. meta-analysis vs. random effect combined analysis

I have data from 200 similar studies, all measuring the same effect of a continuous independent variable on the same continuous response. I say...

• Replies: 0
• Views: 1,507
szm
05-10-2017, 05:58 AM
27. stat questions on multicollinearity

I'm working through some practice on regression analysis and wanted to confirm. My attempt is below. Thanks (1) The correlation between two...

• Replies: 0
• Views: 1,341
05-09-2017, 04:52 AM
28. Which tests to use in these examples? Wilcoxon etc.

I'm pretty clueless, but would appreciate any help very much. I have: Group 1: went from nothing, to receiving surgery 1, and then later on...

• Replies: 4
• Views: 1,381
05-08-2017, 07:40 AM
29. Does frequency distribution matter when using nominal/ordinal data?

I want to do relationship analysis between different variables from questionnaire results that I've just collected and I've recently learned that you...

• Replies: 1
• Views: 1,340
05-07-2017, 05:41 PM
30. Repeated atypical measures..help needed

Hey all, thanks again for the great group and assistance. I have a research of 30 patients (one sample) which performed cognitive tests in the...

• Replies: 3
• Views: 1,513
05-01-2017, 06:47 PM
31. How to analyze change in performance

Greetings, I have a task that two groups of participants completed at Time 1 and Time 2. I was planning to conduct a repeated measures ANOVA,...

• Replies: 2
• Views: 975
04-28-2017, 12:11 PM
32. [R] Estimation of the emprical distribution

Hi all, I was wondering if there's an R package online that automatically estimates the best distribution of my empirical data and gives the...

• Replies: 2
• Views: 864
04-27-2017, 01:26 PM
33. Can i use the results from a PCA if the matrix is 'not positive definite'

Hi, I have a 'not positive definite' correlation matrix having done a principal component analysis (PCA) on SPSS. The data i have used is from a...

• Replies: 1
• Views: 846
04-27-2017, 10:47 AM
34. Can you use correlation for percentages?

I have two variables: the number of employees who work from home in the firm and the number of independent contractors in the firm - and I have this...

• Replies: 0
• Views: 978
sas
04-24-2017, 11:22 AM
35. 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: 709
04-24-2017, 09:08 AM
36. Hotelling's T2 test and chi2 distributions

For the 1-2 weeks I've been trying to decompose the T2 statistic into two independent chi2-distributed statistics, but have had no success. I'm...

• Replies: 0
• Views: 882
04-23-2017, 01:34 PM
37. 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: 692
04-22-2017, 02:48 AM
38. Statistical report

Hi, I am a first-year business student that is taking a stats class. I have a report assignment with the requirement of an executive survey and...

• Replies: 0
• Views: 1,334
04-16-2017, 09:17 PM
39. Can I use an independent t-test to test for significant differences over time?

I have a 50 year time series (2012-2062), and I would like to test to see whether sig. differences exist between two groups of data subjected to...

• Replies: 0
• Views: 842
04-15-2017, 08:20 AM
40. GOF measures

When we validate a statistical model, should we only consider the traditional Goodness-Of-Fit measures? Are there other ways in which the model...

• Replies: 1
• Views: 772
04-14-2017, 10:48 AM
41. GOF Analysis/Discussion

What actions constitute an analysis of goodness-of-fit for a regression model? What are the typical graphical displays used in this analysis of...

• Replies: 1
• Views: 885
04-14-2017, 10:33 AM
42. Dealing with censored dates as regressors

I'm estimating a linear model, with one of the independent variables being a date of appearance. I consider the date to be a minimum date of...

• Replies: 2
• Views: 1,001
nbi
04-13-2017, 11:31 AM
43. [ANOVA - Repeated Measures] When to include subject as a random effect?

I have an eye tracking study in which two groups of subjects (patient and control) are completing a face recognition task in which they learn a set...

• Replies: 2
• Views: 1,431
04-11-2017, 12:00 PM
44. Regression Analysis

I'm trying to better understand linear regression by the following questions. (1) Linear regression assumes: a. The relationship between X...

• Replies: 5
• Views: 1,766
04-07-2017, 10:35 PM
45. How to best maximize sample size for a third order factor CFA

Dear all, I have a sample size question that I'd like to consult your opinions on. In our lab, we gave a particular measure to roughly 450...

• Replies: 0
• Views: 1,191
04-07-2017, 10:34 AM

Hi, I'd highly appreciate your recommendations for a research I'm doing. More specifically, I'd like to know the advantages, disadvantages, and...

• Replies: 2
• Views: 1,312
04-04-2017, 02:18 AM
47. comparing section in a scale using spss

Hi everyone; hope you are doing well, I am actually conducting a research, and I am comparing between a pre and post scale. my problem is that...

• Replies: 4
• Views: 1,635
04-02-2017, 09:55 PM
48. how do we estimate regression parameters in survival analysis

Dear All, I would like to ask how to estimate regression parameters(Beta) in Accelerated Failure Time Model? Does anybody knows any resources?...

• Replies: 3
• Views: 1,497
04-02-2017, 10:43 AM
49. Is survey design statistically correct?

I want to track improvements in how yoga class participants feel on various variables (e.g. energy level, sleep quality, pain felt, mental...

• Replies: 8
• Views: 1,549
04-02-2017, 10:33 AM
50. Which test to use?

I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction...

• Replies: 0
• Views: 1,345
04-01-2017, 03:26 AM
51. Selecting of statistical test?

I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction...

• Replies: 0
• Views: 1,002
04-01-2017, 03:20 AM
52. Meta-analysis - Can I investigate mediation effects for the effectiveness of training

Hello everyone, I am currently working on my Master thesis on moderators and mediators for the effectiveness of cross-cultural training (CCT). I...

• Replies: 0
• Views: 1,158
03-25-2017, 11:34 AM
53. Factor analysis with multiple constructs

Hi all, Have a question related to factor analysis and how to execute it. For instance, in a survey you measure 3 seperate constructs, and use 5...

• Replies: 2
• Views: 1,359
03-24-2017, 08:36 AM
54. reverse causality and endogeneity problems

Hi all, I am trying to analyse the effect of the sex of a CEO (female vs male) on a performance measure of two types of firms (Conglomerate and...

• Replies: 1
• Views: 1,642
03-23-2017, 12:55 PM

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