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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: 18,795
10-11-2014, 12:02 PM
1. ### descriptive correlational study

hello! We have a research study entitled "COMPETENCE ON SAFETY PROTOCOLS AMONG HEALTH AND DISASTER COMMITTEE MEMBERS AND DEGREE OF TRUST OF...

• Replies: 1
• Views: 1,227
03-25-2015, 01:30 PM
2. ### Design Resolution

As a matter of definition, do all factorial designs have resolutions? Sometimes, designs have factors in a +/- table in which none of the factors is...

• Replies: 0
• Views: 1,831
02-21-2010, 12:17 PM
3. ### desperate for some help with a confidence interval question.

• Replies: 0
• Views: 1,563
04-30-2012, 08:30 AM
4. ### Desperate urgent help

Hi everybody, First, let me say how much I appreciate your help here. Its a life saver. I have a presentation tomorrow on my research and I am...

• Replies: 3
• Views: 2,715
02-20-2009, 02:07 AM
5. ### detect mean and variance shifts

from the plotted figure, how i can distinguish what i have to monitor mean or variance to detect a shift from the process

• Replies: 2
• Views: 1,604
05-06-2012, 04:25 PM
6. ### determening normality in repeated measures ANOVA

Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

• Replies: 6
• Views: 19,610
07-19-2011, 05:11 AM
7. ### Determining a new variance

I am trying to understand a property of ML Estimates, that their distribution is asymptotically normal with covariance matrix inverse of Fisher's...

• Replies: 1
• Views: 2,520
BGM
02-19-2011, 04:30 PM
8. ### Determining Clustering in Time Series Data

Dear all, Let me begin by apologising if my question is obvious or rudimentary, I have a very basic knowledge of statistics. I have some time...

• Replies: 2
• Views: 4,130
11-20-2010, 07:14 PM
9. ### determining sample size

Hello everyone, i hope that someone can help me. i'm doing an experiment at my work place. i have 4 vehicles that need to go through the same...

• Replies: 1
• Views: 1,846
11-13-2011, 05:06 PM
10. ### Determining Sample Size for Quality Audit

I hope I am posting this to the right section, I really have no idea about statistics. I work for a healthcare company working in residential...

• Replies: 0
• Views: 2,026
07-11-2014, 03:01 AM
11. ### Determining sample size in a factorial repeated measures ANOVA using GPower

Hi all Can anybody tell me which F-test option in G power 3.1.9.2 is appropriate to find out the sample size for a 2x2x2 repeated measures ANOVA?...

• Replies: 0
• Views: 2,878
07-15-2014, 11:35 AM
12. ### Determining Significance Based on Prelimiary Data

I have conducted a test where I measured the same subjects (n =9, 2 groups) over a period of 8 days. To determine significance between the two groups...

• Replies: 5
• Views: 1,926
02-27-2012, 12:58 PM
13. ### Determining which data set is most like another

I am new to this forum - so let me apologize in advance if this is the wrong location. Given a specific multivariate data set, and numerous other...

• Replies: 6
• Views: 1,757
04-27-2012, 02:08 PM
14. ### DF and fishers vs. pearson's

Hallo everyone I'm having a mental block today, and having trouble getting my df value. So, here's a summary of my data to help: 32...

• Replies: 3
• Views: 2,638
08-29-2011, 12:04 PM
15. ### DF in Repeated Measures ANOVA

Hi all! :wave: In advance: thank you to all those who take the time to even read this post, as well as answer it: Additional to my sunfish study...

• Replies: 0
• Views: 4,730
02-08-2011, 12:23 AM
16. ### Dichotomous data...

Could you tell me if you can use ANOVAs on dichotomous data (specifically "yes" / "no") responses? If not, what other options do you have if your...

• Replies: 1
• Views: 4,687
08-21-2009, 01:41 PM
17. ### Dickey Fuller Test

I am studying the Dickey Fuller test. The book of reference is Introductory Econometrics for Finance by C. Brooks. I firstly consider the zero mean...

• Replies: 1
• Views: 3,155
11-25-2011, 01:49 AM
18. ### Difference between DBLIM and distance-based redundancy analysis???

Hey there statistical wizards, I have been conducting some statistics using Primer on some ecological data incorporating environmental...

• Replies: 1
• Views: 4,738
07-17-2011, 06:07 PM
19. ### Difference between expected spending and observed spending. What kind of statistical

I would like some advice from you about what kind of statistical analysis I could do about that data. My case is as follows: According to a...

• Replies: 0
• Views: 2,183
05-04-2016, 12:02 AM
20. ### difference between mean ranks

Hello! I asked respondents to rank 13 motivation factors in order of importance (from the most important to the least important). Now, I would...

• Replies: 1
• Views: 5,642
08-06-2010, 08:25 AM
21. ### Difference between samples in terms of frequency ranks

I have 3 different texts, and for each one of them, I have the frequencies of 25 letters appearing in those texts (Text A, letter A, freq = 5013;...

• Replies: 0
• Views: 1,299
10-07-2015, 01:57 AM
22. ### 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: 4,205
03-03-2017, 01:48 PM
23. ### Difference between VCV by inverting Hessian at ML and by Hierarchical Bayes

Let's say we have a multimomial logit problem and we find the best beta coeffcients b* aggregating all units. The inverse of the Hessian at b* gives...

• Replies: 0
• Views: 1,118
06-10-2014, 09:59 AM
24. ### Difference in coefficients between regressions?

Hi - I'm looking for a way to test whether the beta coefficients are significantly different between two regression analyses. For example:...

• Replies: 1
• Views: 10,312
03-25-2009, 11:55 PM
25. ### Difference in difference problem.

Hi. I want to examine the effects of a legislative amendment on limited liability companies. I am using a binary variable as my dependent...

• Replies: 0
• Views: 2,105
07-18-2014, 09:01 AM
26. ### Difference in mean for compositional data

How do you test for a different mean between groups in composititions?

• Replies: 0
• Views: 1,098
08-14-2014, 02:11 PM
27. ### Difference needed for power in fixed population.

Hi, I am designing a study to examine the difference made by implementing a new treatment strategy for a medical condition. I have become a...

• Replies: 7
• Views: 3,408
03-25-2011, 12:34 PM
28. ### differences between values a meaningful unit (I like cake too)

Alright I'm still working away on my problem of distance between different types of behavior. I can calculate distances between occurrences and spit...

• Replies: 11
• Views: 2,023
11-04-2012, 01:01 AM
29. ### Differences in differences analysis( 2 vs 1 data values)

Hello I am carrying out a differences in differences analysis for the effects of a treaty agreement on GDP of countries who entered the treaty(...

• Replies: 1
• Views: 1,812
09-01-2015, 11:45 AM
30. ### Differences in responses on a 5 point scale between three groups? Kruskal-Wallis?

Dear madam/sir, Recently I have designed a course that was run at three different locations. To know what the students thought of the course they...

• Replies: 2
• Views: 1,932
04-18-2013, 05:20 PM
31. ### different intercept with Multinomial vs Binomial Logistic?

I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was...

• Replies: 0
• Views: 2,700
09-06-2011, 03:02 PM
32. ### Different p-values for similar model

Hello guys, I have a problem related to p-values. here's screen the problem is very high p-value of CPI in model 7, on the other hand CPI in...

• Replies: 0
• Views: 1,185
03-31-2014, 02:00 PM
33. ### different test for normality

Hi, Can anybody give a brief description for different non-parametric tests of distributions (like normality)? what are differences between...

• Replies: 3
• Views: 2,292
05-05-2013, 12:58 PM
34. ### Difficult forecasting/ density estimation problem in an experimental setting

Hi everyone, I am researcher conducting a set of economics experiments that are eventually supposed to produce some forecasts for a given player’s...

• Replies: 4
• Views: 3,219
07-05-2011, 12:27 PM
35. ### difficulties with finding a suitable research question(s)

Hello, everyone, :wave: I have an ANOVA-analysis task, and I need to come up with the most suitable research questions for it. the task is as...

• Replies: 4
• Views: 1,238
05-03-2013, 08:26 AM
36. ### Difficulty with Rank-biserial correlation coefficient, N = 5

Hi there, I am calculating Difficulty with Rank-biserial correlation coefficients in a spreadsheet using the following formula: rb = (2/n)*(Y1...

• Replies: 6
• Views: 7,864
01-22-2012, 08:49 PM
37. ### Dimensionalities in Multi-Dimensional Scaling

Hello all, :wave: I'm conducting market research and want to use compositional Multi-dimensional scaling to create perceptual maps of Brand...

• Replies: 2
• Views: 1,794
03-14-2013, 12:49 AM
38. ### Directional or Non-directional Hypothesis for Independant t-test?

I am doing a comparative study on the level of depression , anxiety and stress perceived between adolescents (male and females). My sample Size is 60...

• Replies: 8
• Views: 12,428
12-27-2011, 02:48 PM
39. ### directional stats: combination of von Mises distributions

Dear Stats-Experts: I am at loss in my research project and would appreciate any input, reference to literature, publications, etc. Here it goes:...

• Replies: 0
• Views: 1,543
04-18-2012, 09:33 PM
40. ### Discrete choice experiment - correlation between attributes

Hi all, am new to this site, so please excuse if I have posted incorrectly. Basically I have designed a discrete choice experiment (DCE)examining the...

• Replies: 0
• Views: 1,393
06-15-2013, 02:05 PM
41. ### Discrete distribution with var larger than mean

Hi, everyone. Is there any statistical distribution (other than binomial) with its variance larger than its mean? Preferably, a distribution which...

• Replies: 3
• Views: 7,582
10-30-2011, 12:41 AM
42. ### 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: 1,058
07-12-2016, 02:47 PM
43. ### Discrete time series analysis

Hello everybody, Well, as student I'm working this last year on my bachelor proof. The subject I'd chosen is discrete (integer) valued time...

• Replies: 0
• Views: 1,688
04-08-2013, 02:01 PM
44. ### Discriminant analysis with mostly incomplete cases

Hello. I have a bit of a biostats problem. I’ve got data on 5 groups and 15 species. There are 9 variables, and 1000 cases total. The problem,...

• Replies: 6
• Views: 2,934
03-02-2009, 12:52 AM
45. ### discriminant linear analysis, coefficient interpretation

Hi everyone, I am trying to weigh the effect of two independent variables (age, gender) on a response variable (pass or fail in a Math's test)....

• Replies: 2
• Views: 19,421
03-19-2013, 02:47 PM
46. ### Discriminant validity issues. Can this be improved?

Hi, I have some issues with my discriminant validity, as some of the factor variance correlations are greater than the Average Variance Extracted....

• Replies: 0
• Views: 1,274
05-04-2013, 10:51 AM
47. ### disregard post, need 5 posts to pm someone

Random stuff to get 5 posts

• Replies: 2
• Views: 1,006
12-04-2015, 02:23 AM
48. ### Dissemination Research

Hey Guys/Girls!:D Currently im in the finalizing stage of my master thesis (On gossip versus rumor dissemination on the work floor). Out of a...

• Replies: 1
• Views: 1,252
08-04-2013, 01:44 PM
49. ### Dissertation confusion!

Hi there guys, i'm new so hopefully i'll get enough information down here for you, any questions then just ask! Ok so here's the deal... i'm a...

• Replies: 0
• Views: 2,451
03-06-2009, 04:22 PM
50. ### Dissertation statistics

Hi, I am currently writing my dissertation on long term effects of CEO successions, ie. are there any statistically significant effects on measures...

• Replies: 0
• Views: 1,915
07-13-2009, 05:21 AM
51. ### Distribution not normal

Hello, The Shapiro-Wilk test of normality on my data indicates that the distribution is not normal. I have tried to compute the data, but I...

• Replies: 4
• Views: 3,329
04-11-2011, 05:29 PM
52. ### Distribution of estimator (exponential distribution; truncated at both ends)

Good day forum, I've been struggling with for a while and would like to hear some thoughts on this one. I've got an exponential distribution,...

• Replies: 3
• Views: 1,691
11-05-2012, 01:57 PM
53. ### Distribution of p values

Hello, I need some help understanding the last stage of a proof. I am trying to understand the proof that say that the distribution of the P...

• Replies: 4
• Views: 5,644
08-01-2012, 09:11 AM
54. ### Divergent results - RMANOVA vs. paired samples t-tests

Hi there, I'm analyzing a dataset (a pre - post intervention), where I have a baseline and 2 post-intervention time points. If I perform a RMANOVA...

• Replies: 0
• Views: 2,092
05-15-2012, 08:50 AM
55. ### Do I have a problem with simultaneity here??

Hi, I am modelling the demand for imported rice for a sample of countries. The price of imports, one of the explanatory variables, is assumed to...

• Replies: 0
• Views: 3,324
08-29-2009, 07:06 AM
56. ### Do I have to test normality?

I have an experiment contains 10 students and 2 experts. I want to test if the average of students evaluation for the 1st question is similar to...

• Replies: 2
• Views: 1,264
03-03-2015, 11:55 AM
57. ### Do I need separate margins of error?

I have a question regarding margins of error. I'm looking for correlations between political knowledge and favorability of presidential candidates...

• Replies: 0
• Views: 1,637
10-13-2011, 11:01 AM
58. ### Do i use an ANCOVA for a cross over of exams, pre/post study?

I have a study i am running and would like to know the appropriate test to apply, its complicated but bear with me :) Background: We are looking...

• Replies: 0
• Views: 2,900
03-24-2016, 12:35 PM

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