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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: 18,636
10-11-2014, 12:02 PM
1. ### Calculating likelihood for a particular biological sample. Is is possible?

Hi you all! I've got a problem when trying to analyze some biological data in my PhD. Let's say that I'm interested in performing an analysis...

• Replies: 0
• Views: 1,006
09-29-2015, 06:42 AM
2. ### Why use Chi-square?

Hi, I am putting together a statistics course about inference techniques to use when the predictor variable(s) are categorical (by which I mean,...

• Replies: 9
• Views: 4,666
08-15-2012, 01:58 PM
3. ### Why use Kruskal-Wallis?

Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

• Replies: 9
• Views: 7,210
08-13-2012, 03:14 PM
4. ### SEM (Structural Equation Modeling)-trimmed model

Is it okay if I can fix one path between one moderator and another moderator (instead of one path between major variables) to 0 for trimmed model?...

• Replies: 1
• Views: 1,810
09-13-2012, 07:06 PM
5. ### nonparametric test for Two-way repeated measures ANOVA?

What is a nonparametric test for Two-way repeated measures ANOVA?

• Replies: 0
• Views: 8,644
11-01-2012, 12:14 PM
6. ### multivariate logistic regression

I want to do multivariate logistic regression. Does it mean "one logistic regression with 2 dependent variables at the same time? Or Does it mean...

• Replies: 5
• Views: 3,241
szm
06-16-2013, 01:46 PM
7. ### time series analysis

• Replies: 0
• Views: 1,336
04-25-2013, 09:23 AM
8. ### Cox Proportional Hazard method survival analysis

Cox Proportional Hazard method survival analysis is the same as Cox regression analysis?

• Replies: 1
• Views: 2,472
03-20-2013, 02:22 PM
9. ### Durbin-Watson statistics - autocorrelation

If the Durbin-Watson statistics for the OLS regression was 2.268, does it suggest that there is no autocorrelation among residuals since d is near 2?...

• Replies: 4
• Views: 3,441
03-21-2013, 04:01 PM
10. ### creating a variable

MY hypothesis is the following: The demographic variable of age has a significant impact on the relationship between organizational trust and the...

• Replies: 1
• Views: 1,504
03-09-2013, 02:48 PM
11. ### Hlm

I did hierarchical linear modeling. Two variables were not significantly related to the dependent variable at level 1, but I retained them in the...

• Replies: 1
• Views: 1,108
05-16-2013, 02:22 PM
12. ### t-test

The inpatients infection rates will be tracked from the entire inpatient population on all three adult units allowing it to be compared to the rates...

• Replies: 2
• Views: 1,287
07-19-2013, 03:56 PM
13. ### random effects model

In Random Effects model, what do Qb and d indicate?

• Replies: 1
• Views: 1,011
07-11-2013, 03:50 PM
14. ### normal distribution

I tried three transformations (LG10, SQRT, rank transformation). But I couldn't make the data normally distributed. Could you kindly let me know if...

• Replies: 8
• Views: 2,056
09-04-2013, 06:54 PM
15. ### unidimensionality

I have six constructs. Each construct has several items. Before we do structural equation modeling, I want to check unidimensionality and convergent...

• Replies: 0
• Views: 2,023
09-27-2013, 10:13 AM
16. ### confirmatory factor analysis

I did confirmatory factor analysis and wanted to know which item is a high-loading item. One item is significant, but it's path coefficient is...

• Replies: 0
• Views: 1,470
09-23-2013, 05:42 PM
17. ### missing variable

Items include the scale of 0 (Does not apply or not used) to 3 (Used a great deal). I want to combine several items to make one scale. I assigned a...

• Replies: 0
• Views: 1,435
12-10-2014, 03:14 PM
18. ### noramlization

I weighted the variables to do structural equation modeling (SEM). I found that some weighted variables were not normally distributed. Do I have to...

• Replies: 3
• Views: 1,495
01-10-2015, 01:07 AM
19. ### margin of error

I have two questions as follows: *Is there a way to apply the margin of error to achieve 99.99% level of confidence? *Can I use the margin of...

• Replies: 1
• Views: 528
04-02-2015, 12:27 PM
20. ### stat test

I want to test the following hypothesis. Which test would be appropriate to test it? H1: The Millennials in YMCA Central Florida score lower in...

• Replies: 1
• Views: 1,515
07-18-2015, 12:12 PM
21. ### Randomised Complete Block Design (RCBD)

During the cotton-spinning process, a strand of cotton thicker than the final thread is produced, and then twisted before it is wound onto a bobbin....

• Replies: 0
• Views: 1,073
05-03-2016, 01:36 PM
22. ### a completely randomized experimental design and regression

A company studied the effects of three different methods of promotions on sales of its crackers (labeled as Treatment 1 to 3). Fifteen stores were...

• Replies: 1
• Views: 1,728
06-02-2016, 02:38 PM
23. ### within subjects factors

I have two within subjects factors. One variable is fatigue (baseline, fatigue, rest). The other variable is the amplitude of swallowing muscle...

• Replies: 7
• Views: 1,431
04-04-2014, 09:56 PM
24. ### within-subject factor

RQ: Is there an effect of the number of PEmax maneuvers on EMG amplitude? PEmax(within-subject factor: base, fatigue, rest), EMG amplitude...

• Replies: 0
• Views: 874
04-17-2014, 10:23 AM
25. ### posthoc test for a within-subject factor

I am doing MANOVA. I have a within-subject factor "fatigue". One variable is fatigue (baseline, fatigue, rest). One of the dependent variables is the...

• Replies: 0
• Views: 940
04-15-2014, 09:51 AM
26. ### observed number & expected number

I did a chi-square analysis. Could you kindly answer the following question? My observed number is the same as my expected number. How can I...

• Replies: 0
• Views: 1,195
04-30-2014, 03:25 PM

I got a negative adj. r-square. Since the effect size (Adj R-sq=-.016) was low, did it indicate that a time in treatment (the independent variable)...

• Replies: 8
• Views: 3,142
05-02-2014, 05:10 PM
28. ### factor analysis

Can I do a factor analysis with one dependent variable and one independent variable? Do I need to have at least two dependent variables to do a...

• Replies: 5
• Views: 1,170
07-29-2014, 09:02 AM
29. ### 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: 947
07-14-2016, 01:08 AM
30. ### Can relationship be both moderated and mediated?

Hello....using SPSS I've found that the relationship between my IV and DV is fully mediated (Baron and Kenny) by Med1. I've also found using the...

• Replies: 3
• Views: 3,668
01-17-2011, 07:35 PM
31. ### 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: 1,116
08-13-2016, 09:03 AM
32. ### Assistance with Comparing Two Months of Survey Data

I'm probably making this harder than it is but I'll ask for opinions anyways. I'm trying to analyze two months of Yes/No survey data. Each month...

• Replies: 1
• Views: 1,947
05-09-2011, 09:59 PM
33. ### 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: 2,936
02-08-2017, 10:34 AM
34. ### Panel Data Fixed Effects with year dummies

I wasn't sure quite were to put this thread, so I'm posting here even though it's very similar to another one I posted in another thread. Quick...

• Replies: 0
• Views: 3,348
03-19-2013, 09:54 AM
35. ### trend or forecast

I have done some research related to computer users and files generating pattern on PC. I collected data from PC where I have information when (date)...

• Replies: 0
• Views: 2,080
10-20-2016, 06:37 AM
36. ### Comparing 2 groups of means ! shoud I use letters ?

Hello, I hope everyone is doing well ! when comparing groups of means in a table, usually we express the differences in terms of letters next to...

• Replies: 0
• Views: 1,390
07-06-2014, 10:15 AM
37. ### correlation with missing data

I got a problem with correlating 2 signals x1,x2 (isgnal in time) with missing data. the missing data is periodic and is in both signals. my...

• Replies: 0
• Views: 1,424
08-17-2014, 05:46 AM
38. ### Advice for a book about Higher Order and Asymptotic Likelihood

Hi, I'm a bachelor student in statistics. I'm looking for a book about higher order and asymptotic likelihood that is not too complicated and...

• Replies: 0
• Views: 795
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09-14-2015, 07:50 AM
39. ### Comparing the mean of two non-random groups

Students are assigned to group A or B based on two aspects: a grade from an exam and an evaluation of their teacher. Students with both a high grade...

• Replies: 1
• Views: 1,758
11-30-2013, 10:59 AM
40. ### Comparing categorical data with 2 independent variables

Hi All, I'm a student researcher and am needing some statistical advice. I stumbled upon a post regarding a similar problem at this site, so I'll...

• Replies: 0
• Views: 1,401
05-22-2012, 09:12 AM
41. ### 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: 1,146
07-16-2016, 06:53 AM
42. ### Effect size for small non-parametric data

Hi Guys, I would like to run a effect size test for a very small non-parametric analysis (n=4 per group), which one is the most recommended test?...

• Replies: 5
• Views: 3,094
06-30-2014, 06:25 PM
43. ### Terminology for comparing reference questions to answers after a policy change

Hi, I´m conducting a questionnaire in order to examine the behavior of drivers of electric vehicles when providing information, such as parking...

• Replies: 0
• Views: 903
05-16-2015, 05:35 AM
44. ### 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: 452
06-21-2017, 10:59 AM
45. ### predictive analysis algorithm

Hi, What will be the best algorithms to use in case of predicting a large set of web data. mainly there will be 3 ,4 variables with which i want...

• Replies: 0
• Views: 2,485
05-25-2010, 07:57 AM
46. ### Gibbs Point Process

Does anyone knows what is the aim of using Gibbs marked point process?! I read a paper that used this method to find the best configuration of...

• Replies: 0
• Views: 1,013
11-29-2012, 05:41 PM
47. ### Confidence interval for N, based on binomial

Hi all, I've searched the web and these forums but couldn't find a subject that resembled my problem. If I missed something then I'd like to...

• Replies: 0
• Views: 1,282
07-14-2014, 03:59 AM
48. ### single function of two gaussian distributed variables..

Hi Folks, I have a two 2 dimenstional gaussian function of variables x and y and of their respective standard deviations. I have single valued...

• Replies: 3
• Views: 1,309
03-29-2015, 05:48 AM
49. ### Regression Assumption

Why do you need to meet the homogeneity of regression assumption in ANCOVA? If this assumption violates so what happens?

• Replies: 0
• Views: 1,504
12-04-2013, 04:42 AM
50. ### How to test this research model? With SEM?

Hey, I am currently writing my master thesis and have gathered all the necessary data and complete my model. 1) Institutional dimension...

• Replies: 1
• Views: 1,398
01-26-2014, 05:45 PM
51. ### Process averages as data points in factorial ANOVA

(Reposting here, original posted in the "Statistical Consulting" forum) Hello all! Electrical engineer here, currently doing research in...

• Replies: 1
• Views: 2,178
10-13-2009, 09:29 PM
52. ### Data Groveling

I am in the market for biomedical assay data that has lower detection limits and preferably be longitudinal. Someone asked me to find some...

• Replies: 0
• Views: 1,836
04-01-2010, 06:05 PM
53. ### 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: 2,835
01-12-2017, 07:14 PM
54. ### 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: 1,781
01-12-2017, 07:24 PM
55. ### How to calculate variance on pooled data

I have an array of pairs. Each pair represents a "bin" in a range. Each pair stores a sum and a count. Data is added to a pair/bin by adding the...

• Replies: 2
• Views: 6,022
05-30-2010, 09:49 PM

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