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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: 18,750
10-11-2014, 12:02 PM
1. Correlation in contentency tables using determinants??????

"This paper suggests a measure of association (or correlation) between nominal data. It relies on the use of determinants. The general idea is that...

• Replies: 0
• Views: 1,696
05-05-2011, 09:06 AM
2. Event study t-test help

Hi, Im doing a report about clinical trials and abnormal effect returns on the stock market. I have collected 7 events with an eventwindow of -5...

• Replies: 0
• Views: 3,609
05-04-2011, 03:14 PM
3. Any suggestion: book on score test?

Hi. I'm trying to understand what is a score test to test certain model based on discrete distribution. So far i manage to find only score statistic...

• Replies: 0
• Views: 2,108
05-04-2011, 09:05 AM
4. Which statistic to use to determine gender differences in rankings?

The scenario: 50 men and 50 women are asked to rank a list of ten vegetables in order of preference (1=favorite, 10=least favorite). I want to...

• Replies: 1
• Views: 2,139
05-04-2011, 12:10 AM
5. Can they called unequal sample sizes and t-test/ANOVA?

I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

• Replies: 0
• Views: 2,769
05-02-2011, 03:09 AM
6. Analyzing Likert scale

Hi, I am doing my research on QWL prevailing in Industry. I have collected data through questionnaire on 5 point likert scale, 1=strongly disagree...

• Replies: 4
• Views: 11,063
05-01-2011, 07:56 AM
7. Pca

Hi guys, There is something basic I don't understand about PCA, maybe you can explain it to me in simple words. After getting the components...

• Replies: 0
• Views: 1,942
05-01-2011, 04:02 AM
8. need help in determining appropriate sample size

Hi: I need help in calculating Sample size for my study. I am aiming to collect survey response for leadership study from different firms located...

• Replies: 0
• Views: 1,787
05-01-2011, 12:56 AM
9. Sports Board Using Statistics Incorrectly?

Our state sports board has declared a competitive imbalance between public and private schools, and are taking swift action to correct it. This...

• Replies: 0
• Views: 1,506
04-30-2011, 08:09 PM

I have a research project and I am really confused on what I should do with the data. I asked people to complete a survey. The survey had 10...

• Replies: 1
• Views: 1,587
04-29-2011, 04:26 PM
11. Testing assumptions

Hi, I would greatly appreciate it if some-one would point me in the right direction. I have to critique the statistical methods used in a few...

• Replies: 2
• Views: 2,327
04-29-2011, 08:12 AM

Hi I am doing a masters in health and need to analyse data I have. I basically have 2 groups, 1 group immunised (2500) and one group not (1000). I...

• Replies: 2
• Views: 2,368
04-28-2011, 01:48 PM
13. T-test appropriate?

Hello all, I have a big dataset which I divided into different periods (years) and focused on one group. I calculated the means for the different...

• Replies: 3
• Views: 2,432
04-28-2011, 06:33 AM
14. non-parametric equivalent for mixed-factorial design

I have to analyze my confidence data which is measured using a likert scale (1 – 7). Because it’s ordinal in nature, I need to use non-parametric...

• Replies: 2
• Views: 3,640
04-27-2011, 11:13 PM
15. Statistical Independence

I'm trying to give my students a brief introduction to chi-square testing, but there's something that's a little confusing to me regarding the...

• Replies: 1
• Views: 3,423
04-27-2011, 11:02 PM
16. Help with deciding upon a test

Usually I'm pretty good with figuring out what test to use but this has me puzzled: I'm more familiar with the ANOVA camp than the regression camp...

• Replies: 2
• Views: 1,615
04-26-2011, 12:13 AM
17. PCA latent variables

For exploratory purposes, should PCA (Principal Component Analysis) be done for one latent variable at a time or should it done for all the latent...

• Replies: 3
• Views: 4,811
04-25-2011, 09:33 PM
18. At Wits End

Hi, I am doing a research report as a requirement for the course I am doing. Professor provided us with data and it's up to us to establish a...

• Replies: 2
• Views: 2,101
04-23-2011, 01:28 AM

Hi, I am doing a project at university dealing with some new experimental data that I could use a few hints on to get started. The data is for...

• Replies: 2
• Views: 2,127
04-22-2011, 07:49 PM
20. Likert scale - questionnaire administered twice - longitudinal study

Hi, I am running a longitudinal study which lasted for few months during which all participants used a specific communicaiton device. I conducted...

• Replies: 1
• Views: 3,039
04-22-2011, 06:34 PM
21. Letters denoting significant multiple comparisions in a table

Please ignore question no longer need help - thank you for all of your responses!

• Replies: 0
• Views: 1,914
04-21-2011, 08:13 PM
22. KS or Wilcoxon?

I have some survey data which I want to analyse using non-parametric test. It is a single sample (approx. 100) It is ordinal - likert scale e.g....

• Replies: 4
• Views: 5,835
04-21-2011, 01:37 PM
23. Missing data analysis

Hello, I have a longitudinal study with a very high drop-out. At Time 1, I have 93 participants, but only 47 of them took part at Time 2. Now,...

• Replies: 1
• Views: 2,020
04-21-2011, 09:42 AM
24. How to choose the good hypothesis test: Correlation or simple Regression?

Hi, I have two questions for you on which I have issues: - Should I use the correlation test or the simple regression test for this hypothesis:...

• Replies: 0
• Views: 2,335
04-21-2011, 09:25 AM
25. z-test rule.

Hello, I am a new user in this forum. I am wondering whether I can use z-test for a small amount of data, Let us say, "English and Math marks" for...

• Replies: 5
• Views: 4,317
04-19-2011, 12:28 PM
26. Bayesian inference, MAP and sampling (Gibbs)

Hi all I'm applying bayes inference to a GMM, based on some data set. I'm using Gibbs sampling to get the "samples" from the posteriors (the mean's...

• Replies: 6
• Views: 4,948
04-17-2011, 09:30 PM
27. Understanding ANOVA requirements better.

Two ANOVA requirements are 1. Approximately Normal Data 2. Equal Variances Online the normality requirement is often simply stated as the...

• Replies: 2
• Views: 17,092
04-17-2011, 07:04 PM
28. EM algorithm - estimation

Hi. I try to implement EM algorithm for multivariate missing values, but i have problem with estimating function. Suppose µ is mean vector, Σ is...

• Replies: 0
• Views: 2,408
04-17-2011, 11:20 AM
29. chi-square post-hoc tests?

Hi there, I've been searching the forum and elsewhere to figure out how to interpret my chi-square results and I can't find anything that relates to...

• Replies: 4
• Views: 15,564
04-16-2011, 02:54 PM
30. what to do for unknown PDFs.

Hi guys 1) When we are performing signal detection , and we have received this y(n)=x(n)+z(n) for n=0,1,2,3...., where z is gaussian noise, but...

• Replies: 0
• Views: 4,008
04-12-2011, 10:59 PM
31. Statistical test for two Maxwell-Boltzmann distributions

Suppose we have two processes A and B, and N subjects, x_i. A(x) is distributed as a Maxwell-Boltzmann distribution with scale parameter alpha_a;...

• Replies: 2
• Views: 3,606
04-12-2011, 01:10 PM
32. EM Algorithm for Gaussian Mixture model fitting data with missing values

I have an EM function that will take regular data with no missing values, and compute means, standard deviations, and probabilities of components of...

• Replies: 1
• Views: 4,385
04-12-2011, 11:26 AM
33. 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: 3,326
04-11-2011, 05:29 PM
34. Grade (A, A-, B+, B, B-....)

Im planning to do run some correlation and different groups stat test on my data. In my all scenarios, Grade is a dependent variable. So, my question...

• Replies: 2
• Views: 3,194
04-11-2011, 06:32 AM
35. What tests should I use to analyze my data? Immediate input appreciated

Hello TalkStats members :wave: I have some data I need to analyze. I first would like to say I hope I am posting this in the correct sub-forum,...

• Replies: 2
• Views: 4,273
04-10-2011, 07:13 PM
36. Interpretation of Granger Causality test

Hi All, I am using granger causality test on two variable A and B (Both becomes stationary after taking first lag) in eviews. I used both the...

• Replies: 0
• Views: 14,943
04-10-2011, 05:28 AM
37. Hello Everyone, need stats help

Hello everyone, :wave: I'm new to this forum. I need some help figuring out what kind of analysis to run for my undergraduate thesis. I did...

• Replies: 0
• Views: 2,543
04-09-2011, 04:48 PM
38. PAVA - isotonic regression

Hello, I'm searching for a research, and I hope I can get your help. I have an article showing an estimator for a cdf F, Fn, based on a function...

• Replies: 0
• Views: 2,664
04-09-2011, 11:27 AM
39. Help w/survey results!

I am hoping someone can help me figure out how to do the following: I am a member of my child's school's accountability committee, and as such we...

• Replies: 4
• Views: 3,533
04-08-2011, 04:05 PM
40. Correction for multiple testing when tests are dependent

Dear all, I have a following problem: given N variables, I calculate N(N-1)/2 correlation coefficients, each against each (this is commonly used...

• Replies: 3
• Views: 7,789
04-08-2011, 02:24 PM
41. How to measure 1.5 σ after regression.

I am new at Stats, i request for some hints/answer to better understand the concept of calculating the second equation. BACKGROUND: I have...

• Replies: 0
• Views: 217,232
04-08-2011, 08:17 AM
42. Rolling or continuous surveying or sampling

I have been looking everywhere for an answer to this problem, so far with no luck. Hopefully the statistics gurus on this board will know the...

• Replies: 0
• Views: 6,218
04-08-2011, 06:50 AM
43. Need help to test the significance

I want to make a test to see if the difference is significant or not. What I have is two different groups of values (one with 31 values and the other...

• Replies: 5
• Views: 3,505
04-07-2011, 07:38 PM
44. Statistical matching

Hi Folks, Am New to this statistical analysis domain, but have a problem at hand. I have a list of movies and each movie have various attributes...

• Replies: 0
• Views: 2,745
04-07-2011, 04:36 PM
45. Excess Return - Benchmark Returns

Well, I am new in the field of business research with very little stastics knowledge. Problem is that I have to calculate <excess return> which...

• Replies: 3
• Views: 5,571
04-06-2011, 08:11 PM
46. Which test should I use?

Working on a medicine research paper here, really hoping someone can help me out. I have a group of patients for which I have data relating to...

• Replies: 5
• Views: 2,674
04-06-2011, 11:00 AM
47. Formula of Return

I am new at Business Research, i have a problem that i am not sure about the formula of calculating return. Can you please help me confirm that...

• Replies: 1
• Views: 4,516
BGM
04-05-2011, 07:38 PM
48. crosstabs -

I have a crosstabs with two categorical variables. 6 columns x 4 rows. Data are proportions, not means. Basic chi-square shows me that the...

• Replies: 0
• Views: 3,251
04-05-2011, 03:52 PM
49. Help with t-test data analysis

Hi everyone, I am a bit lost when it comes to stats, having only had a tiny amount of it so far. In my biology class we are writing a paper on if...

• Replies: 3
• Views: 3,236
04-05-2011, 05:19 AM
50. Finding SD given mean and n

I am looking at data from State Assessment results and would like to compare means for schools. The problem is that the data that is given does not...

• Replies: 2
• Views: 4,139
04-04-2011, 11:53 PM
51. Roy's largest root VS all the other ones...

does anybody know why the statistical significance of Roy's largest root does not imply the statistical significance of the other three popular...

• Replies: 5
• Views: 23,086
04-04-2011, 07:08 AM
52. Modelling the yield from sports bets - Potentially using a mixture of distributions?

Hello all, A friend of mine asked me to analyze some data which comes from placing bets on sports. Having read quite a few threads and seeing how...

• Replies: 11
• Views: 5,572
04-01-2011, 03:35 PM
53. Significance Testing Material

Hi I am new to this forum. Can any body let me know about the material for Significant Testing? I would like to have a training for our team on...

• Replies: 0
• Views: 2,054
04-01-2011, 06:20 AM
54. SEM - model fit question

Hello all, my first post here. I was hoping that you could help me decide whether to decide for one model or another. Both have good fitting...

• Replies: 2
• Views: 2,856
03-31-2011, 10:49 AM
55. Regression line slope for R^2 ~= 1

Sorry if my question is answered in textbooks! I was wondering what the slope would be for the regression line of a regression that has an R squared...

• Replies: 9
• Views: 12,829
03-31-2011, 07:02 AM
56. Seeking Organized Centralized Statistical Database with data w/ geographic relations

My apologies for the long title, I do not know how to word this. Are there any good, centralized, geographically & time related (e.g. avg male...

• Replies: 0
• Views: 1,865
03-30-2011, 08:46 PM
57. help me, i need some ideas for my dissertation

Okay i am going to conduct a regression analysis to explain the variation in patents per capita across regions in China. I have done some...

• Replies: 1
• Views: 2,410
03-30-2011, 06:24 PM
58. bias of the coefficient of variation

Is the coefficient of variation biased? How would you compute the bias of CV? Can I write E(sigma_hat/|mu_hat|) = E(sigma_hat)E(1/|mu_hat|)+ ...

• Replies: 4
• Views: 5,692
03-30-2011, 02:38 PM
59. Modelling Categories and Data

Hi, any help would be greatly appreciated. I am trying to create growth models for different tree species which correlate tree weight with height....

• Replies: 0
• Views: 1,655
03-30-2011, 05:51 AM

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