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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: 18,698
10-11-2014, 12:02 PM
1. ### How to test the P-value in this type of situation

Hi all, this is my first post on the forum... I apologize in advance, this explanation might be a little long...please let me know if anything is...

• Replies: 2
• Views: 2,374
03-25-2011, 04:42 PM
2. ### Sigma within an averaged group

I am trying to assess variation in a process in which the sample is too small to measure individually. To get a rough idea of the variation, I have...

• Replies: 0
• Views: 1,869
03-25-2011, 09:28 PM
3. ### Is Levene's transformation with ANOVA equivalent to Levene's W?

Hello, Just a quick question that I have been pondering: I read an article (Plavcan and Cope, 2001 Evol. Anthro.) where they say that Levene's test...

• Replies: 0
• Views: 5,368
03-25-2011, 09:36 PM
4. ### Need some help choosing correct statistical method for study

Hi. I'm about to carry out a study and require suitable statistical method(s) for it. I plan to measure the effect of fluoridation on the growth of...

• Replies: 2
• Views: 4,652
03-27-2011, 02:56 AM

A company is interested in investing in companies in Hong Kong. They have access to large dataset on the rate of return on assets (expressed in...

• Replies: 1
• Views: 2,216
03-27-2011, 01:14 PM
6. ### What is the technique of analyzing pooled cross sectional data?

Like the title suggests, I have a data set that comprise of several cross sectional waves. The subjects in each wave are different, just to be clear....

• Replies: 0
• Views: 3,560
03-28-2011, 02:15 AM
7. ### Survival Analysis with non 0 start time

I have lifetime observations. I have an observation for all records in the universe, but not all the records will begin with a cohort time 0. ...

• Replies: 2
• Views: 4,406
03-28-2011, 07:11 PM
8. ### EM Algorithm

Hi All, I am trying to implement the EM algorithm for a 3 population exponential distribution. I am having the following issues. 1. If l1_true=;9...

• Replies: 1
• Views: 2,901
03-28-2011, 07:40 PM
9. ### ?is there a test for this?

I have one nominal (disease, no disease) dependent variable and two independent variables I wish to look at regarding whether or not they are...

• Replies: 2
• Views: 2,094
03-28-2011, 08:45 PM
10. ### Choosing Statistical Tests for a Study

I am designing a study and I am trying to figure out what statistical tests I will need to run. I haven't taken stats in a few years, and my...

• Replies: 8
• Views: 5,256
03-28-2011, 11:41 PM
11. ### What type of analysis??

The purpose of my experiment was to study how ultraviolet radiation effects the quality of eggs. My explanatory variables are: 1) The distance at...

• Replies: 1
• Views: 2,070
03-29-2011, 07:11 PM
12. ### interval censored data using bootstrap method

I have time Xi that is interval censored and the data consist of time intervals Ii = such that Xi is within Ii , Ri>Li, i=1,...,96 My interest is...

• Replies: 2
• Views: 4,838
03-29-2011, 09:09 PM

Hi, I am working with a large data set with all categorical variables except for age, which I will want to group in to age bands. I think I am...

• Replies: 2
• Views: 2,319
03-29-2011, 09:23 PM
14. ### 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: 1,648
03-30-2011, 05:51 AM
15. ### 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: 5,671
03-30-2011, 02:38 PM
16. ### 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: 2,402
03-30-2011, 06:24 PM
17. ### 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: 1,850
03-30-2011, 08:46 PM
18. ### 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: 12,794
03-31-2011, 07:02 AM
19. ### 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: 2,838
03-31-2011, 10:49 AM
20. ### 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: 2,050
04-01-2011, 06:20 AM
21. ### 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: 5,546
04-01-2011, 03:35 PM
22. ### 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: 23,005
04-04-2011, 07:08 AM
23. ### 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: 4,104
04-04-2011, 11:53 PM
24. ### 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: 3,226
04-05-2011, 05:19 AM
25. ### 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: 3,225
04-05-2011, 03:52 PM
26. ### 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: 4,507
BGM
04-05-2011, 07:38 PM
27. ### 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: 2,664
04-06-2011, 11:00 AM
28. ### 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: 5,555
04-06-2011, 08:11 PM
29. ### 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: 2,728
04-07-2011, 04:36 PM
30. ### 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: 3,492
04-07-2011, 07:38 PM
31. ### 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: 6,191
04-08-2011, 06:50 AM
32. ### 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: 217,183
04-08-2011, 08:17 AM
33. ### 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: 7,738
04-08-2011, 02:24 PM
34. ### 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: 3,511
04-08-2011, 04:05 PM
35. ### 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: 2,656
04-09-2011, 11:27 AM
36. ### 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: 2,529
04-09-2011, 04:48 PM
37. ### 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: 14,903
04-10-2011, 05:28 AM
38. ### 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: 4,235
04-10-2011, 07:13 PM
39. ### 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: 3,181
04-11-2011, 06:32 AM
40. ### 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: 3,315
04-11-2011, 05:29 PM
41. ### 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: 4,371
04-12-2011, 11:26 AM
42. ### 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: 3,594
04-12-2011, 01:10 PM
43. ### 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: 3,862
04-12-2011, 10:59 PM
44. ### 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: 15,504
04-16-2011, 02:54 PM
45. ### 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: 2,397
04-17-2011, 11:20 AM
46. ### 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: 17,040
04-17-2011, 07:04 PM
47. ### 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: 4,933
04-17-2011, 09:30 PM
48. ### 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: 4,284
04-19-2011, 12:28 PM
49. ### 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: 2,325
04-21-2011, 09:25 AM
50. ### 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: 1,999
04-21-2011, 09:42 AM
51. ### 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: 5,813
04-21-2011, 01:37 PM
52. ### 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: 1,908
04-21-2011, 08:13 PM
53. ### 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: 3,034
04-22-2011, 06:34 PM

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: 2,121
04-22-2011, 07:49 PM
55. ### 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: 2,088
04-23-2011, 01:28 AM
56. ### 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: 4,797
04-25-2011, 09:33 PM
57. ### 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: 1,605
04-26-2011, 12:13 AM
58. ### 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: 3,412
04-27-2011, 11:02 PM
59. ### 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: 3,633
04-27-2011, 11:13 PM

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