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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: 18,683
10-11-2014, 12:02 PM
1. ### Question about copula-GARCH models

Hello everyone, I am learning about copulas and also do some MATLAB coding to get better understanding of how copulas work. Recently I have...

• Replies: 3
• Views: 8,624
06-26-2008, 03:15 AM
2. ### Help needed - estimating effect size

Hi everyone, I'd really appreciate any help/guidance in solving a little problem of mine. I need to know how to estimate an effect size...

• Replies: 3
• Views: 4,618
08-05-2008, 02:00 PM
3. ### Infinite divisibility under mixing - kernel density estimation

Hi all, Can we consider a (multi-modal) kernel density estimate as a finite mixture of probabiliy distributions which would be infinite divisible?...

• Replies: 3
• Views: 4,829
08-18-2008, 12:07 PM
4. ### doctoral research

I would like help with posting and or and analylzing the results of mail surveys on collaboration onto SPSS.

• Replies: 3
• Views: 2,579
11-10-2008, 02:13 AM
5. ### How to model time-dependent covariate in random effect model?

I am using a random effect model to examine the effect of several covariates on the outcome variable over time. Some of the covariates are...

• Replies: 3
• Views: 9,778
11-14-2008, 06:37 PM
6. ### Hypothesis design

Hi, I have a question regarding hypothesis design. In other words, how to properly assign H0 and H1. For example, if I have statement: Some drug...

• Replies: 3
• Views: 3,301
11-19-2008, 12:31 AM
7. ### Comparing Improvement Between Groups - Best Approach?

Perhaps this is an easy issue, but I wanted to throw it out anyway. I'm working on a dataset where there are two groups, both having pre- and...

• Replies: 3
• Views: 4,034
01-14-2009, 10:27 PM
8. ### Statistical Research Question

Here is what I am looking at: I want to know how 3 factors (we'll call them A1, A2, A3) correlate with Store Sales per Store (532 stores). In...

• Replies: 3
• Views: 3,432
01-22-2009, 02:09 AM
9. ### 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: 2,705
02-20-2009, 02:07 AM
10. ### comparing two charts

Hi, i am new in forum and i am an amateur in Statistics. I have two data sets of the same thing and i want to compare them. For example i have 20...

• Replies: 3
• Views: 2,829
05-06-2009, 05:20 PM
11. ### Perception of non-parametric techniques as inferior?

Hi guys, I've recently worked on a project supervised by a lecturer in the school of psychology at my university. She's been looking over the...

• Replies: 3
• Views: 9,554
05-08-2009, 06:17 AM
12. ### ANOVA weighted means?

Hi Chaps, I am trying to run a comparison between two groups - patients and staff - ratings of the quality of life on a ward. Simple enough,...

• Replies: 3
• Views: 5,762
06-05-2009, 12:15 PM
13. ### Why no international statistical testing?

I am wondering why it's generally not done to conduct a statistical testing comparing prevalence rate between two different countries even they have...

• Replies: 3
• Views: 2,385
09-06-2009, 08:51 PM
14. ### which test to use?

Hello everyone, Im a bit stuck as to which test i should be using for my analysis. i have collected the reaction times of 35 participants. There...

• Replies: 3
• Views: 1,897
09-15-2009, 07:33 AM
15. ### Tricky(?) sampling problem

Hello all! I have a survey data set consisting of interview answers of different people. The people have been sampled with simple random sampling....

• Replies: 3
• Views: 3,640
09-27-2009, 02:33 PM
16. ### Estimating initial level after the treatment!

Hi, Say I wanted to examine the effect of some treatment on a hormone level but I could not measure the pre-treatment level. Example, person runs...

• Replies: 3
• Views: 2,618
10-09-2009, 11:46 AM
17. ### I'm Confused, simple question...

Hello all. I was reading a friend's dissertation and came across something that left me a bit perplexed. In his study, he stated that there...

• Replies: 3
• Views: 2,787
10-15-2009, 03:56 PM
18. ### Certain sample size needed for HLM?

I have a data set of test scores and memory scores of 111 students, nested in 12 different classroom. 6 classrooms are from high income areas and 6...

• Replies: 3
• Views: 17,290
11-04-2009, 10:14 AM
19. ### attributes of individuals in discrete choice tasks

Hello stat talkers, :wave: I'm currently working on a marketing (discrete choice) project concerning brand choice and I stumbled upon some questions...

• Replies: 3
• Views: 3,413
11-23-2009, 04:23 AM
20. ### need a little hint..... Rosenberg measure of self esteem

Hey everyone, I am not the most statistacally minded person so please talk to me like you would to a 4 year old :eek: I am conducting a study...

• Replies: 3
• Views: 2,709
03-07-2010, 10:58 AM
21. ### Suggestions on Testing of Related Factors

I am designing an experiment that measures the performance of a computer-based system as the response. The response will be measured by how long it...

• Replies: 3
• Views: 2,314
03-14-2010, 11:48 AM
22. ### How to prove the UMVUE under these conditions

Hi everyone, the question is Let \mathbb{U} be the set of all unbiased estimators of 0. Namely, \mathbb{U}={U(X):...

• Replies: 3
• Views: 3,202
04-06-2010, 12:00 PM
23. ### Market research questionnaire re-design

Hi, I have a questionnaire which contains 91 questions, I need to take away roughly 10-20 of them due to cost reason. I was thinking to use Factor...

• Replies: 3
• Views: 2,657
05-28-2010, 08:10 AM
24. ### Sample

Consider we have a random sample (120 answers) and a convenience sample (80 answers) from the same population. Since the means of both samples are...

• Replies: 3
• Views: 2,488
05-31-2010, 08:03 AM
25. ### Regression Model

wefwefwfweff

• Replies: 3
• Views: 3,882
06-04-2010, 09:04 AM
26. ### Ranking advertisers based on performance

Hi, let's say you run an ad network and you want to rank your advertisers based on their performance. Now what most networks do is simply...

• Replies: 3
• Views: 2,882
07-13-2010, 02:23 PM
27. ### Choosing an appropriate Statistical Test

Hi All, I'm new here - just wanted to ask you which statistical test I could use for the following case (thanks in advance!): Information: ...

• Replies: 3
• Views: 3,574
12-06-2010, 11:36 PM
28. ### Using measures with different Likert-type scaling

I need some advice regarding methodology. I am creating a single questionnaire comprised of 4 different measures - all with likert-type scaling. ...

• Replies: 3
• Views: 5,120
08-19-2010, 12:28 AM
29. ### Suggest an Unbiased estimator for θ

Prove that the maximum of the random sample of size 'n' from uniform distribution over is a biased but a consistent estimator of θ. Suggest a n...

• Replies: 3
• Views: 91,371
BGM
08-19-2010, 03:49 AM
30. ### puzzling change in effect in multilevel linear regression; suppressor effect?

In my analysis of educational achievement of second generation migrants, I modelled the effect of mother's and father's education in two ways, which...

• Replies: 3
• Views: 4,442
09-09-2010, 05:56 AM
31. ### When do we use...

just out of curiosity.... where is Mathematical Statistics, if at all, do we use modern algebra (i.e Groups, Rings,....) ?

• Replies: 3
• Views: 2,344
09-11-2010, 10:33 AM
32. ### Using likert scale data and nominal, ratio scale data for Partial Correlation

Hi All, If Pearson correlation is used through Partial Correlation (on SPSS) for measuring variables measured on a Likert Scale, can we use...

• Replies: 3
• Views: 14,553
10-07-2010, 08:03 PM
33. ### Calculating a sample size for a study

Hi, I am trying to do a study on patients with a certain disease. I would like to retrospectively review their charts and check whether there were...

• Replies: 3
• Views: 2,830
10-24-2010, 10:24 AM
34. ### finding UMVUE

let X_1,X_2,.....X_n be a random sample from f(x;\theta)=\frac{e^{-|x|/\theta}}{2\theta}, -\infty<x<\infty Find UMVUE of \theta^r help needed...

• Replies: 3
• Views: 6,943
BGM
11-13-2010, 01:44 PM
35. ### MLE of bivariate normal

how to calculate the MLEs of the 5 parameters of a bivariate normal population, the parameters being \mu_x,\mu_y,\sigma_x,\sigma_y,\rho? while...

• Replies: 3
• Views: 9,743
11-30-2010, 02:23 AM
36. ### Repeated measures anova or t test

Hi, The question I have is about which test I could use for the following case: - two groups (an experimental and a control group) - two measures...

• Replies: 3
• Views: 6,706
01-08-2011, 12:43 PM
37. ### an event study? I can't stand. which way should I choose?

Please a little help. There is an event. You can think a government interference . So, price of firms is decreased and therefore quantity of...

• Replies: 3
• Views: 6,358
01-02-2011, 06:15 PM
38. ### 2 Dice Rolls vs. 1 Target Number

Hi guys, I hope you don't mind my posting this here. I'm a game designer who needs some help working out probabilities for a dice roll mechanic, and...

• Replies: 3
• Views: 4,100
01-06-2011, 11:09 AM
39. ### Preference - which statistical method?

I'm conducting an experiment on female preference with respect to male colouration (black vs. white male mice). The results of the experiment...

• Replies: 3
• Views: 7,598
01-15-2011, 03:38 PM
40. ### 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: 3,688
01-17-2011, 07:35 PM
41. ### How to analyze different, complex data sets?

I'm looking for a good way to compare data sets. For 20 months, we collected larval fish using standard sampling gear (produces larval fish/cubic...

• Replies: 3
• Views: 9,143
01-25-2011, 04:13 AM
42. ### testing problem

Let X_1 and X_2 be random sample from a distribution having the probability distribution function f(x). Consider the testing of H_0:f(x)=f_0(x)...

• Replies: 3
• Views: 1,873
01-22-2011, 10:06 AM
43. ### Sunfish NMDS/PERMANOVA in reverse

I have extensive habitat data for four sunfish species, and I would like to determine if (statistically) they partition habitats to reduce...

• Replies: 3
• Views: 4,500
02-08-2011, 12:41 AM
44. ### t-tests after three-way ANOVA?

Hi all, I've just run a three-way ANOVA on my data (3 IVs, 1 DV). I've got some main effects, as well as a three-way interaction effect. Am I...

• Replies: 3
• Views: 5,850
03-04-2011, 05:20 PM
45. ### 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: 3,221
04-05-2011, 05:19 AM
46. ### nonparametric estimate the distribution with a histogram only

Suppose X1,.., Xn ~iid F with mean mu_F The data is summarized in a histogram and that is all I have. I don't have the individual Xi (i = 1,...,n)....

• Replies: 3
• Views: 3,070
BGM
03-24-2011, 11:47 PM
47. ### 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: 5,547
04-06-2011, 08:11 PM
48. ### 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: 7,711
04-08-2011, 02:24 PM
49. ### Mann-Whitney or independant T-test?

Hey all, I'm in the middle of a study comparing a group of CONTROL MICE vs EXPERIMENTAL MICE before and after a stroke. I'm looking at comparing:...

• Replies: 3
• Views: 4,302
06-13-2011, 05:01 PM
50. ### 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: 4,786
04-25-2011, 09:33 PM
51. ### 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: 2,424
04-28-2011, 06:33 AM
52. ### Can anyone help please?

Hi there, for my dissertation I wanted to know the important factors that managers consider in selecting a supplier. I used a likert scale 1-5 from...

• Replies: 3
• Views: 1,712
05-12-2011, 10:59 AM
53. ### Need help in finding historic data on real interest rate and CPI

Hi everyone, In my research I use several financial instruments including real interest rate and real CPI. So far, I have been unable to find any...

• Replies: 3
• Views: 4,208
05-21-2011, 10:01 AM
54. ### Calculating proability

If the probability of a resulting number being 10 is %80 chance, 5 %50 and -2 %40 what is the most probable outcome(it could be between values) based...

• Replies: 3
• Views: 2,046
06-13-2011, 02:37 PM

How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

• Replies: 3
• Views: 8,779
06-22-2011, 05:55 PM
56. ### paired t test and simple linear regression

Two repeatedly measured samples: 15 subjects were measured by two different machines (old and new) for their weight subject machine 1 machine...

• Replies: 3
• Views: 11,360
07-06-2011, 05:48 PM
57. ### matching

How close in age must subjects be for them to be considered matched for age in an experiment? For example, if I am conducting an experiment on...

• Replies: 3
• Views: 2,064
07-07-2011, 02:31 PM
58. ### which test I should use?

hello, i am conducting research on retail atmosphere in which i have collected data on three different retailing sectors i.e furniture retailers,...

• Replies: 3
• Views: 2,133
07-13-2011, 04:09 PM
59. ### statistical significance and number of experiments required

Hi all I have a n*3 matrix. I add guassian noise with mean 0 and SD 1 to this matrix ... My hypothesis is that this noise does not change a...

• Replies: 3
• Views: 2,304
07-14-2011, 01:04 PM

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