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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: 18,765
10-11-2014, 12:02 PM
1. ### What experimental design would be most appropriate?

In my study I have two study groups: Group A is composed of X subjects which are either males or females, and every subject is characterized by...

• Replies: 0
• Views: 2,568
11-11-2016, 03:40 PM
2. ### Item Response Question

I have received some survey data for 200 respondents. DV: Binary (20=1; 180=0) 20 IVs, Likert 5-point scale and currently treated as...

• Replies: 5
• Views: 2,634
11-14-2016, 03:21 AM
3. ### Question research statistics (really stuck)

-------------------------------------------------------------------------------- This is a question pertaining to a real-life data analysis. It is...

• Replies: 0
• Views: 3,358
11-14-2016, 04:21 PM
4. ### multivariate regression problem - correlated residuals

this question asks for help for a statistical/econometric problem I can't get the clue: I have a classic multivariate regression problem, i.e....

• Replies: 0
• Views: 2,421
11-15-2016, 06:12 AM
5. ### ROC Curves

Good Morning, I have a problem that may perhaps be very simple, but I keep getting very stuck and very frustrated. I'm trying to produce ROC...

• Replies: 0
• Views: 2,495
11-18-2016, 04:13 AM
6. ### Sample size estimation for multinomial autocorrelated data

I'm trying to work out the minimum sample size needed to accurately characterise land cover data. The idea is to set out the a number of quadrats...

• Replies: 0
• Views: 2,388
11-18-2016, 06:28 AM
7. ### Testing Historical Data

Hello Folks, I have 5 years of data on GPA, credit completions etc. and several categorical variables ( ex. gender, ethnicity, age). I have tried...

• Replies: 0
• Views: 2,343
11-18-2016, 03:18 PM
8. ### it is must to include include ANOVA results in specified format

Hi. My thesis has calculations that uses one-way ANOVA.There are 40 dependent variables which are needed to be compared under 14 independent...

• Replies: 0
• Views: 3,464
11-19-2016, 03:19 AM
9. ### Choosing bachelor's thesis topic

Hello everyone. I am going to make research on statistics/data analysis for my bachelor's thesis. What are the popular areas of research in...

• Replies: 0
• Views: 3,069
11-19-2016, 09:49 AM
10. ### Stuck on Battle Plan for analysis

Hello, Currently I am looking for some advice regarding my research. Previous research has shown that Construct 1 and Construct 2 are both...

• Replies: 1
• Views: 2,517
11-21-2016, 03:10 AM
11. ### Data analysis

Hi, please can someone help me out. I would like to know if I have performed the correct analysis for my study. I am comparing direct response...

• Replies: 0
• Views: 3,336
11-21-2016, 01:51 PM
12. ### GAMs: test of simple effects following a significant interaction

Hello, I am a novice in Generalized Additive Models (GAMs) and I would need some advice on these models. From capture data, I would like to...

• Replies: 0
• Views: 2,936
11-22-2016, 01:44 PM
13. ### What kind of tests i can do to see if two diseases are related

I am using data from this website (data is at the bottom of the page) for a case-study. For the sake of question lets stick to any of FluWatch sheet...

• Replies: 5
• Views: 3,167
11-22-2016, 02:02 PM
14. ### sure independence screening in clustering

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• Replies: 3
• Views: 3,064
11-23-2016, 01:01 AM
15. ### How to deal with unknown distribution?

I have a game with two players. Player 1's type is publicly known, while player 2's type is unknown (privately known to him) and distributed, say,...

• Replies: 0
• Views: 3,336
11-24-2016, 03:31 PM
16. ### How can I statistically prove which data is more reliable

We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

• Replies: 0
• Views: 2,546
11-26-2016, 12:56 AM
17. ### which statistic analysis-percentage frequency data-protocol analysis

I have done a research with designers. I collect the data from every one separately through protocol analysis. I want to find the association...

• Replies: 0
• Views: 3,163
11-30-2016, 11:35 AM
18. ### Estimated Parameter as Dependent Variable

Hi, Would anybody be able to help me with the following problem? That would be great!! :) In my analysis I follow a two-step approach. In the...

• Replies: 2
• Views: 3,106
12-01-2016, 02:37 PM
19. ### Propensity score matching - pre-treatment outcome variable

Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and...

• Replies: 5
• Views: 3,597
12-05-2016, 03:20 PM
20. ### Poisson point process

I came across this in a network model: Distribute N points according to a homogeneous Poisson point process in a two-dimensional space of unit...

• Replies: 0
• Views: 2,696
12-06-2016, 02:24 PM
21. ### S-shapec urve goodness of fit

hi, I'm looking for a statistical test to prove (statistically) that the cumulative curve is S-shape When I try to look for answer I get 2...

• Replies: 0
• Views: 2,701
12-07-2016, 01:44 AM
22. ### Probability of Events in Equations

Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

• Replies: 3
• Views: 3,730
12-12-2016, 09:48 AM
23. ### How to analyze two opposing sides survey results?

Hi! I am doing a research between two b2b sides that are cooperating. I have already made one survey and about to do the other. The point is to...

• Replies: 2
• Views: 3,328
12-12-2016, 12:15 PM
24. ### Likert scale in SPSS

Hello, I’ve got an research assignment to do by means of questionnaire. I’ve got some basic info (gender, education level, etc) and then I’ve got 9...

• Replies: 1
• Views: 2,637
12-13-2016, 08:11 AM
25. ### Sample Size Help for Observation Study

I wanted to calculate sample size for a single group, observational study. I'll be using a questionnaire to predict outcome (i.e. score on another...

• Replies: 4
• Views: 3,143
12-16-2016, 10:29 AM
26. ### Repeated k-fold Cross-Validation

I saw this: "Any advices on practice? It depends on the data, but it's common to find examples cases 10 fold CV, plus repetition: 10 fold CV,...

• Replies: 12
• Views: 7,175
12-16-2016, 10:35 AM
27. ### One Sample T-Test with Likert Scale Questionnaire

Hi all, I am doing a research and will study the how user think about shopping online. In my questionnaire, I have 3 questions - using Likert...

• Replies: 8
• Views: 66,585
12-17-2016, 02:18 AM
28. ### Structured Modeling or Multiple Models?

We conducted a study in order to determine the factors that influenced turtle nest site selection. We collected various environmental variables from...

• Replies: 0
• Views: 4,538
12-20-2016, 09:24 AM
29. ### What non-parametric test should I use?

Hi all, I am looking for some help on finding an appropriate test to analyse the variance between groups. The data I am assessing is: -...

• Replies: 1
• Views: 3,027
12-21-2016, 01:24 AM
30. ### Parametric t-tests for individual / portfolio stock returns

Hello everyone, I am relatively rookie with statistical tests and I am trying to perform a parametric t-test for stock returns as follows. I have...

• Replies: 2
• Views: 3,429
12-21-2016, 10:22 AM
31. ### Centering level-1 interaction terms in HLM

Dear all, I’m running multilevel analyses with HLM and wish to examine an interaction between two level 1 predictor variables. Following...

• Replies: 1
• Views: 2,767
12-21-2016, 01:24 PM
32. ### Median or Mean vs Data distribution

Hi, I am stuck at this point in my thesis in selected between Median and Mean. My data and work: I have a set of data X, and for each data y...

• Replies: 3
• Views: 3,245
12-26-2016, 09:50 AM
33. ### Which statistical test shall I use please? Thanks a lot

Hi I am trying to compare 2 groups- one that has had surgery on the same leg (37) vs opposite leg (48) and to compare whether there is any...

• Replies: 3
• Views: 3,664
12-29-2016, 08:42 AM
34. ### how to obtain p-value from test statistic

I am familiar with how to obtain the p-value from the t-statistic - the t-statistic is calculated by looking at the difference in means in two...

• Replies: 0
• Views: 2,788
12-29-2016, 03:26 PM
35. ### MANOVA and MANCOVA - Help needed

I have collected data with one Independent Variable (two levels - nominal) and 4 dependent variables (all scale - continuous). I decided to do a...

• Replies: 0
• Views: 2,403
01-01-2017, 05:29 PM
36. ### 1 way Anova vs Two Way Anova -HELP needed

I suck at stats and am always confused >.< I have 24 animals. Let's say I have 3 groups of animals (A,B,C) and 8 in each group. Each group...

• Replies: 2
• Views: 3,146
01-05-2017, 09:06 AM
37. ### What statistical test do I use?

Hi there, I'm doing a study on the influence of sexuality on a camouflaging questionnaire which has a score rating (0-40), so is an interval...

• Replies: 1
• Views: 2,896
01-07-2017, 10:12 PM
38. ### What would be the appropriate statistical tool?

Dear all, I am a graduate researcher in the analysis phase of my research work. My research is an intervention research (n=14) trying to analyze the...

• Replies: 3
• Views: 2,568
01-11-2017, 06:17 AM
39. ### Maximum number of groups in Kruskal Wallis one-way analysis of variance

Is there a maximum number of groups in Kruskal Wallis' one-way ANOVA? I am looking at a data set with 42 separate groups and I am unsure if there...

• Replies: 5
• Views: 2,879
01-12-2017, 07:14 PM
40. ### Why does the following assumptions matter?

When running an ANOVA we are told that certain assumptions of the test must be present for it to be applicable to the data. I never understood the...

• Replies: 0
• Views: 1,802
01-12-2017, 07:24 PM
41. ### Dealing with regression to the mean

If I have two time points T1 and T2 and separate the groups based on their performance at T1 (High v Low), then after treatment assess their...

• Replies: 4
• Views: 3,036
01-12-2017, 10:52 PM
42. ### Constant such that correlation is zero

Suppose that we four random variables, A, B, C, D that have the same standard deviation. Here, A, B, C, and D are chosen randomly and independently...

• Replies: 0
• Views: 1,875
01-13-2017, 01:17 AM
43. ### Comparing two variable datasets

Hello, I would like to see if two 2-dimentional datasets are the same, my data consists of two groups of xy data - the data is not linearly...

• Replies: 0
• Views: 2,391
bjj
01-13-2017, 02:25 PM
44. ### Comparing Intervention Groups for Students

I am assigning interventions to student groups based on pre-test data (reading ability). I am using several different reading interventions. Our...

• Replies: 0
• Views: 2,386
01-14-2017, 11:00 AM
45. ### Statistical analysis - Work Delay - Some tests relations

Suppouse that we have a dataframe called dataWork with data from a database. There are several variables and 2 of them are: - Delay: time...

• Replies: 0
• Views: 2,180
01-18-2017, 05:33 AM
46. ### How to obtain standard deviation of replicate experiments?

I have been searching in books, fora and articles but I can't seem to find a clear cut answer to the following question: I ran two experiments...

• Replies: 0
• Views: 2,593
01-20-2017, 03:40 AM
47. ### Weighing male/female responses (30/70 distribution)

Hi all! I've got a question. I received 617 responses to a questionnaire however, 445 of them are female (72%). There are two ways to fix this: ...

• Replies: 1
• Views: 2,281
01-25-2017, 12:39 PM
48. ### Problem with unequal variance

Greetings, I’ve collected some data on an office wellness program and have found mixed results between the treatment (wellness activities) and...

• Replies: 1
• Views: 2,282
01-25-2017, 07:50 PM
49. ### utizing slightly different variables as 1 variable

I am running a path model, and one of my DV's that I wish to utilize is course performance. The problem is that across my classes that are in my...

• Replies: 1
• Views: 2,382
01-27-2017, 03:31 PM
50. ### Looking for appropriate non-parametric test for 5 dependent group & small sample size

What is the most appropriate parametric test for repeated observations for multiple dependent groups.

• Replies: 1
• Views: 2,257
01-29-2017, 12:56 AM
51. ### Unsure of which statistical method to use- Please help!

Hello, I'm writing a research proposal but I don't have a strong background in statistics. It would be great if someone can let me know which...

• Replies: 2
• Views: 2,423
01-30-2017, 04:24 PM
52. ### How to rank factors of a confirmatory factor analysis?

Hey there, within my current study I would like to determine the importance of different behavioral intentions. Since behavioral intentions are...

• Replies: 0
• Views: 1,681
01-30-2017, 05:52 PM
53. ### HELP: Using Data on Different Spatial Scales for Econometric Regressions

*Background: Using a Production Function in form of Autoregressive Regression Model for Regional Perfomance* Hi, This question is more of a...

• Replies: 0
• Views: 1,488
02-03-2017, 03:06 AM
54. ### Help understanding separate- and joint- factor analyses in CFA and ESEM

Folks, I am reading an article that tested 2 models--one with an hypothesized separate-factor relationship between five pairs of personality...

• Replies: 2
• Views: 2,127
02-03-2017, 10:43 AM
55. ### Medical Device Testing (CV%)

Hi all, looking for a bit of help. I have a number of medical devices to test, 150 to be precise. Two levels of sample to test on each device. I...

• Replies: 0
• Views: 1,898
02-04-2017, 12:07 PM
56. ### Theoretical Regression Problems

What is the term for when your outcome variable is truncated and that may be dampening your results? For example, you use a dichotomous outcome for...

• Replies: 11
• Views: 2,335
02-07-2017, 09:52 AM
57. ### Correlation length

Hi all, I'm working on a hydrological model. I supposed to build a mesh with correlation length in the permeability field. I know what is the...

• Replies: 7
• Views: 2,992
02-08-2017, 10:34 AM

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