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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: 18,758
10-11-2014, 12:02 PM
1. ### 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: 5,156
08-19-2010, 12:28 AM
2. ### 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: 91,699
BGM
08-19-2010, 03:49 AM
3. ### Sample size calculation formulae

Sample size calculation formulae Can someone please let me know where I can find a suitable 'Sample Size calculation Formula'? A standard...

• Replies: 2
• Views: 3,722
08-21-2010, 11:38 AM
4. ### paired T-test or anova

Dear all just a quick simple one this time. if i had two sets of runners (in a race) for example and these two groups were linked only by the fact...

• Replies: 7
• Views: 5,608
08-23-2010, 10:53 PM
5. ### Interpret statistical data - Relative risk, power, and significance?

"We estimated that a sample size of 1240 patients followed up for an average of 3 years would lead to detection of a 33% difference in the relative...

• Replies: 4
• Views: 6,290
08-28-2010, 03:53 AM
6. ### Negative binomial regression / poisson regression

Does anyone have experience with STATA? and more specifically how to conduct a negative binomial regression in stata? My problem is that i dont...

• Replies: 2
• Views: 8,841
08-28-2010, 04:24 AM
7. ### repeated measures MANOVA on mixed design

Hi folks, I have data from a drug study that I am trying to perform statistical analysis on, and am not sure if my approach is correct. I was...

• Replies: 0
• Views: 7,073
08-30-2010, 03:24 PM
8. ### Comparing means from SAME sample

I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

• Replies: 0
• Views: 3,672
09-01-2010, 01:35 PM
9. ### Combining outcome scores: standardising case and control data

Hi tehre, I have 2 separate tasks that I ask a group of individuals to complete, half the group are given a drug after the baseline measure is...

• Replies: 0
• Views: 3,867
09-05-2010, 08:02 PM
10. ### Does anybody have a calculus example for Bartlett and Levene tests?

Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

• Replies: 14
• Views: 6,451
09-07-2010, 05:59 AM
11. ### non-parametric 1-way anova, but samples not independent

Hi, I'm in a quandary. Samples that I wish to analyse are ordinal and should be treated as a matched (dependent) since they were drawn from a...

• Replies: 1
• Views: 4,284
09-07-2010, 07:27 AM
12. ### Question Regarding Results from Matched Pair T-Test versus Tamhane's Test

I have a group of data from a survey regarding attitudes. The data was collected pre and post intervention on a group of students. The data n is...

• Replies: 1
• Views: 4,525
09-07-2010, 10:44 AM
13. ### 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: 4,481
09-09-2010, 05:56 AM
14. ### Finding the cov matrix of MLE using Hessian

To properly calculate the covariance of an MLE you would need to find the inverse of the Fisher information matrix, evaluated at the MLE. And this...

• Replies: 1
• Views: 7,559
09-10-2010, 03:20 PM
15. ### 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: 2,361
09-11-2010, 10:33 AM
16. ### Confused regarding Principal Component Analysis

Hi all, I have a scenario in which I was advised to use Principle Component Analysis but my knowledge of stats is fairly rudimentary so I am...

• Replies: 11
• Views: 3,293
09-13-2010, 08:34 PM
17. ### Markov Chain Monte Carlo method

I am new to Markov chain Monte Carlo method. What's the difference between MCMC and normal Monte Carlo method, and what are the major applications of...

• Replies: 0
• Views: 2,180
09-14-2010, 02:12 PM
18. ### Help!

I am stuck in trying to figure out which methodology I should use. I am working with survey data that quantifies certain attributes about managers...

• Replies: 0
• Views: 1,633
09-15-2010, 04:30 AM
19. ### public safety risks

I think some US regulatory agencies are taking advantage of the public's "Zero Risk Bias" to oversell safety in order to profit, and I would like to...

• Replies: 0
• Views: 1,979
09-16-2010, 01:53 PM
20. ### Comparison of time series

Hi there, firstly I would like to say that I'm newbie here, so hi everyone, and please be patient if I do something wrong. And sorry for my level...

• Replies: 2
• Views: 9,364
09-17-2010, 11:58 AM
21. ### question on statistical analysys

Hi, I am a java developer and don't know much about statistics so please pardon me if I have posted in wrong forum or asking wrong question. I...

• Replies: 0
• Views: 1,780
09-17-2010, 01:43 PM
22. ### Analysis with multiple unordered factors?

Hi everyone, I hope some expert out there can point me in the right direction on this. I have a binomial outcome (A/B) and a number of...

• Replies: 0
• Views: 2,072
hrj
09-18-2010, 03:50 PM
23. ### How many random events to cover everything with 95% confidence?

Ok so I have what I believe to be a rather easy question, which I even feel I should be able to solve myself, but I can't... I hope someone can help...

• Replies: 4
• Views: 3,002
09-22-2010, 03:14 AM
24. ### Spearman-Brown also for the effect of additional raters?

To achieve higher reliability in a questionnaire, it is common to add more items to the questionnaire. If the new items are parallel to the previous...

• Replies: 5
• Views: 5,098
Per
09-23-2010, 04:14 AM
25. ### Working With Population Data

Is there a way to determine if a difference is significant when using entire population data? For example if i see that the difference between test...

• Replies: 9
• Views: 7,104
09-23-2010, 05:12 AM
26. ### Measuring the Association between Nominal variables

I currently have a sizable dataset containing question-answer variables with multiple levels (4-8) that are unordered and a variable Id like to...

• Replies: 0
• Views: 3,363
09-23-2010, 06:20 PM
27. ### HLM Sample size and Equality of Groups

Hi, I have 3 data points (Fall, Winter, Spring) regarding the oral reading fluency of 2 groups of children collected over a school year....

• Replies: 0
• Views: 3,253
09-25-2010, 07:31 PM
28. ### Numeric algorithm to compute probability for Beta Binomial

Dear all, I am trying to find a numeric method that can be handled at least by Excel to compute the probabilities of Beta Binomial distribution....

• Replies: 2
• Views: 6,673
09-26-2010, 03:48 PM
29. ### Confused: correlated groups Chi Square?

Hi all, I have three groups: Group C is a subset of Group B which is in turn a subset of Group A. Members of Groups B and C were not randomly...

• Replies: 0
• Views: 2,553
09-27-2010, 06:12 PM
30. ### Learning Statistics by myself

I have a fair grasp of linear algebra and calculus at an undergraduate level and had a couple of questions about probability statistics and data...

• Replies: 0
• Views: 2,435
09-28-2010, 05:10 AM
31. ### Analyzing statistics reports

I am working on analyzing a report regarding ginger use in alleviating nausea/vomiting in pregnancy. I had my professor look over my report because...

• Replies: 0
• Views: 2,012
10-01-2010, 03:01 PM
32. ### My professor told me that a t-test wasn't the correct procedure to use in a report

In my report it states: "the incidence of vomiting after treatment showed a 9% decrease in the control group, which was not significantly...

• Replies: 2
• Views: 2,692
10-02-2010, 01:34 PM
33. ### Z-test for different proportions: why are they all sig. different?

Hi all, so I am wondering what about my data is making all of my Z-tests for different proportions sig. different (and it says actual conf. level...

• Replies: 5
• Views: 5,317
10-03-2010, 06:56 PM
34. ### Meta-Analysis Procedure

Hi all, I recently took upon the challenge of conducting a meta-analysis of studies in a particular domain and I am facing an obstacle on which...

• Replies: 0
• Views: 3,992
10-04-2010, 05:01 PM
35. ### Is it correct to use Pearson correlation for variables measured on a "Likert scale"?

Hi All, I'm conducting a research testing the relationship of 2 variables which are measured on agreement scales. Is it correct to use Pearson...

• Replies: 2
• Views: 14,794
10-04-2010, 06:41 PM
36. ### Summary variable for adversities

Fellow members, I'm doing research currently on the effects of childhood adversities on development of the autonomic nervous system. I'm a little...

• Replies: 8
• Views: 5,811
10-07-2010, 12:30 AM
37. ### Correlation Proof

Hi guys, wondering if you could help me with a proof that I am trying to figure out. Here it is... Corr (A, B) = 0 and Corr (B, C) = 0. This...

• Replies: 7
• Views: 6,644
10-07-2010, 03:34 PM
38. ### 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: 14,663
10-07-2010, 08:03 PM
39. ### suitable statistical method

Hi all, This is my first post here. I have a data (Subset-A) requiring statistical treatment. Descriptive statistics of the data: Size =...

• Replies: 4
• Views: 2,539
10-08-2010, 04:39 AM
40. ### Internal consistency reliability

Hi there, I have a question about the internal consistency reliability. In a within-subject design, I created a 13-item of self-repeated 9-point...

• Replies: 0
• Views: 2,970
10-11-2010, 07:52 AM
41. ### Small sample size, correlation

Ok, I am helping someone to run spss on his data,He just wants to know the results and not advice.But still I am hating my gut because his method...

• Replies: 13
• Views: 23,040
10-11-2010, 02:31 PM
42. ### Uncertainty in Sample Dispersion

I'm an astronomer and I have a statistics question that I'm not sure how to answer. I'll try to generalize the problem in a clear way. I have a...

• Replies: 1
• Views: 3,369
10-12-2010, 06:05 PM
43. ### Help correlating Likert scale data with demographic profile

I'm not knowledgeable about statistics, so please excuse any mistakes in phrasing. Our professor is currently on leave, and I don't have anybody else...

• Replies: 4
• Views: 6,423
10-12-2010, 10:20 PM
44. ### Weighting survey answers - different approaches

Hej! I've quite recently changed job moving both to another country and from private to public sector. I have both before and currently worked as...

• Replies: 1
• Views: 3,482
10-17-2010, 01:36 PM
45. ### Normal Extreme Values

Mostly I have been answering questions, but today I am asking one: what is the distribution of the maximum of n draws from a normal distribution? ...

• Replies: 2
• Views: 2,850
10-17-2010, 11:19 PM
46. ### IQR and Standard Deviation

Hello everyone, I'm trying to determine if there is a relationship that exists between IQR and Standard Deviation in all distributions, not just...

• Replies: 2
• Views: 3,554
10-20-2010, 04:28 PM
47. ### Special kind of latin square?

I'm not sure if what I'm about to describe is used in statistics, but if so I'd like to know if it has a special name to distinguish it from other...

• Replies: 1
• Views: 2,207
op1
10-21-2010, 12:40 PM
48. ### type of study?

In a poll of 20,000 randomly selected college seniors, it was determined that 95% of them have a cell phone. What is the type of this...

• Replies: 7
• Views: 2,281
10-21-2010, 12:57 PM
49. ### Requesting Jenks natural breaks algorithm for Statistica

Hello forum, I am studying particle size distributions and have been advised to locate an R algorithm/routine to implement Jenks natural breaks...

• Replies: 1
• Views: 3,975
10-21-2010, 04:52 PM

Bayesians, puzzle me this: If you are trying to learn the $p$ parameter of a binomial distribution, the least informative prior is the uniform...

• Replies: 1
• Views: 3,894
10-21-2010, 10:55 PM
51. ### 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: 2,858
10-24-2010, 10:24 AM
52. ### Constructing Latin Squares?

I've come across some blurbs online about how to create or arrange latin squares which are complete, or quasi-complete. However the examples...

• Replies: 1
• Views: 1,641
op1
10-25-2010, 06:54 PM
53. ### when Bootstrap Correlation coefficient (Pearson) con be used?

Hi! Though I know the mechanics of the bootstrap methods, I am do not manage to find in literature a clear-cut explanation about when and in what...

• Replies: 0
• Views: 4,104
10-26-2010, 06:19 AM
54. ### Q-Q plot

The Q-Q plot is more sensitive to deviances from normality in the tails of the distribution, whereas the normal probability plot is more sensitive to...

• Replies: 1
• Views: 5,194
10-26-2010, 07:24 AM
55. ### Assumed autocorrelation

Hi all-- I apologize if this is an incredibly naive question, but I'm currently working with a signal and I need to find the "assumed lag-1...

• Replies: 0
• Views: 1,554
10-27-2010, 09:35 AM
56. ### What statistical test and software to use for a Japanese reading comprehension exper?

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• Replies: 0
• Views: 2,059
10-31-2010, 10:29 AM
57. ### Variance estimation

A simple question we have a random sample n=2 with X, Y drawn from a normal distribution N~(0, \sigma^2). Is V=\frac{X^2}{2}+\frac{Y^2}{2} a...

• Replies: 21
• Views: 6,501
11-01-2010, 06:42 AM
58. ### what am i supposed to do?

Let X_1,X_2,........,X_n ~ N(\mu,\sigma^2), both \mu and \sigma^2 unknown. Find the value of b which minimizes the MSE of the estimator...

• Replies: 8
• Views: 3,054
11-02-2010, 11:22 AM

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