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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: 19,431
10-11-2014, 12:02 PM
1. ### How to combine correlated vector-valued estimates

I'd like to combine several vector-valued estimates of a physical quantity in order to obtain a better estimate with less uncertainty. As in the...

• Replies: 1
• Views: 1,598
03-21-2017, 03:03 PM
2. ### Interpreting CFA Output

I have recently been performing confirmatory factor analysis to assess model fit for an established measure, the measure has previously been...

• Replies: 0
• Views: 1,341
03-20-2017, 07:33 AM
3. ### Data Collection

I am an education major and am lost in my research class! I have the research question of, "How does classical music playing in the background...

• Replies: 1
• Views: 1,394
03-15-2017, 07:28 AM
4. ### What specific type of GLM to use?

I'm trying to figure out what type of distribution (Poisson or binomial) to use to measure differences in proportions using logistic glm. Basically I...

• Replies: 2
• Views: 1,504
03-13-2017, 04:52 PM
5. ### clasiffy - weka

can I use cfs setset evaluator /greedy stepwise for correlated? Which attributes seem to be most linked to the class attribute? how do understand...

• Replies: 0
• Views: 1,083
03-12-2017, 04:33 PM
6. ### Bayesian analog to Generalized Estimating Equations?

GEE2 (second order generalized estimating equations, see Prentice and Zhao 1991 Biometrics) can be used to model the mean and covariance of a...

• Replies: 1
• Views: 1,384
03-11-2017, 10:46 AM
7. ### Anova?

Hi I have a question regarding statistical tests. Assume that I have to run a program 5 times (5 iterations) and each time it gives me some...

• Replies: 0
• Views: 1,191
03-10-2017, 06:38 PM
8. ### How to compare R2 across three independent samples?

Is it possible to compare an R2 value across three independent samples? I am familiar with the Fisher r to z test, but this is only for correlation...

• Replies: 0
• Views: 1,564
03-07-2017, 01:00 PM
9. ### statistical inference in materials science

Hi all, I'm currently doing a quick study into a material where grain size could potentially affect a desired property Y, but I'm uncertain about...

• Replies: 0
• Views: 1,212
03-07-2017, 12:17 PM
10. ### Experimental design: ANOVA? help!

Hello, I have to analyze one paramater (lipid content) of seeds from 5 different cultivars. I am planning to do two independent analysis of the...

• Replies: 3
• Views: 1,656
03-05-2017, 09:09 AM
11. ### Difference between two independent proportions

Hello, I am not a statistician, however, for my latest small research, I would like to test whether there is a difference between two independent...

• Replies: 4
• Views: 4,494
03-03-2017, 01:48 PM
12. ### Analysing Limited Data

Help! For my thesis I involuntary have a small dataset due to a limited population. I was thinking about analysing this data with the statistical...

• Replies: 0
• Views: 1,234
03-03-2017, 06:52 AM
13. ### Anova with data reduction? (Experimental design)

Hi, this is my first post, I hope to do nothing wrong like posting in the wrong area.:pag It happens that I did an experiment where I have a...

• Replies: 4
• Views: 2,282
03-03-2017, 01:37 AM
14. ### Finding my control group PSM, Matching or regression model and correct for confounder

Hey there, First off I'm hoping I'm posting this in the right place. I'm doing research where there is a patient group of n=9 that underwent...

• Replies: 3
• Views: 1,898
03-02-2017, 09:41 PM
15. ### Correcting alpha for multiple anovas

Hi! I have 7 different properties, all independent, that are being mesured. Each property has a control and three disease groups. All independent....

• Replies: 1
• Views: 1,636
03-02-2017, 01:38 PM
16. ### Statistic test for comparing time budget?

Hi all I am a beginner in statistics and I have the following difficulty. I video-recorded some animals in two populations and I calculated...

• Replies: 1
• Views: 1,638
03-02-2017, 11:20 AM
17. ### ANOVA or t-test?

I want to test 2 different treatments (diets), repeating each treatment 3 times on 25 individuals independent samples. After each repetition, four...

• Replies: 2
• Views: 1,855
03-01-2017, 12:20 PM
18. ### Select two variables with values closest to 50 among 5 variables

I have a problem regarding the analysis of a big dataset, that I can't seem to tackle by myself! Help would be really appreciated: This is the...

• Replies: 0
• Views: 1,179
03-01-2017, 09:41 AM
19. ### Dealing with unknown dependencies between variables

Hi! I have a system where I'm studying 3 different diseases, however they share some pathological similarities. There is no data on them being...

• Replies: 2
• Views: 2,135
02-26-2017, 10:51 PM
20. ### Need help selecting appropriate test

I'm currently trying to select the appropriate significance test and test of association and would really appreciate some help. My independent...

• Replies: 0
• Views: 1,211
02-26-2017, 02:38 PM
21. ### Poisson Distribution

Hi, I am using the Poission distribution to calculate probabillity for x = X. Poisson distribution is skewed to the right when lambda is small....

• Replies: 7
• Views: 2,333
02-20-2017, 05:07 AM
22. ### obtain inter-aarival from bulk arrival

I have some data regarding the arrival of customers at a shop. These arrivals are bulk arrivals which have been collected at fixed time intervals...

• Replies: 16
• Views: 3,297
02-19-2017, 05:24 PM
23. ### Help with master thesis method for analysis, first time quantitative research

Deleted because of serious flaw in question asked. Will edit with an update

• Replies: 0
• Views: 1,846
02-17-2017, 07:10 PM
24. ### What model to use?

Hi, I'm currently doing a piece of research that requires statistical analysis however this is very out of my comfort zone and I am unsure of what...

• Replies: 2
• Views: 2,062
02-17-2017, 04:14 PM
25. ### Sample size determination for ANOVA / KRUSKAL WALIS

Hi! I need help with my dissertation regarding sample size calculation. I will be grateful if anybody can help me out with this... My study...

• Replies: 0
• Views: 1,399
02-16-2017, 11:04 PM
26. ### RMSEA manually

Hello, I'm working with the trial version of a software that does not allow me to calculate the RMSEA for my CFA. Could I calculate this manually?...

• Replies: 0
• Views: 1,609
02-13-2017, 04:50 AM
27. ### is my concept of averaging averages under this scenario wrong?

hi all, I'm confused on the concept of whether or not to average the averages under this scenario, when the data collected are from different...

• Replies: 0
• Views: 2,166
02-11-2017, 04:48 AM
28. ### 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: 3,181
02-08-2017, 10:34 AM
29. ### 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: 2,484
02-07-2017, 09:52 AM
30. ### 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: 2,089
02-04-2017, 12:07 PM
31. ### 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: 2,246
02-03-2017, 10:43 AM
32. ### 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: 1,593
02-03-2017, 03:06 AM
33. ### 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: 1,816
01-30-2017, 05:52 PM

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: 2,645
01-30-2017, 04:24 PM
35. ### 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: 2,458
01-29-2017, 12:56 AM
36. ### 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: 2,610
01-27-2017, 03:31 PM
37. ### 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: 2,442
01-25-2017, 07:50 PM
38. ### 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: 2,453
01-25-2017, 12:39 PM
39. ### 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: 2,797
01-20-2017, 03:40 AM
40. ### 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: 2,291
01-18-2017, 05:33 AM
41. ### 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: 2,513
01-14-2017, 11:00 AM
42. ### 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: 2,587
bjj
01-13-2017, 02:25 PM
43. ### 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: 2,015
01-13-2017, 01:17 AM
44. ### 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: 3,248
01-12-2017, 10:52 PM
45. ### 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: 1,903
01-12-2017, 07:24 PM
46. ### 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: 3,091
01-12-2017, 07:14 PM
47. ### 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: 2,765
01-11-2017, 06:17 AM
48. ### 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: 3,012
01-07-2017, 10:12 PM
49. ### 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: 3,316
01-05-2017, 09:06 AM
50. ### 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: 2,537
01-01-2017, 05:29 PM
51. ### 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: 2,994
12-29-2016, 03:26 PM
52. ### 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: 4,146
12-29-2016, 08:42 AM
53. ### 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: 3,469
12-26-2016, 09:50 AM
54. ### 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: 2,937
12-21-2016, 01:24 PM
55. ### 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: 3,677
12-21-2016, 10:22 AM

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