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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: 18,696
10-11-2014, 12:02 PM
1. ### Census & tests for significance?

I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

• Replies: 6
• Views: 6,100
11-12-2010, 02:09 PM
2. ### ranking and meta-analysis

Hi everybody, I have a problem regarding some statistical evaluations. I want to conduct a meta-analysis of several papers. The goal of the...

• Replies: 2
• Views: 5,689
11-11-2010, 03:02 AM
3. ### Inter rater reliability

I'm hoping someone might be able to help me figure out how best to analyse the data I have. For my research, subjects each create 3 small image...

• Replies: 0
• Views: 3,550
11-10-2010, 11:45 AM
4. ### Can you combine survey responses for a Confidence Interval

Hi, I'm doing basic analysis on a national survey but would like to combine responses to a question and was wondering if I can report a confidence...

• Replies: 2
• Views: 2,533
11-10-2010, 11:04 AM
5. ### Volume of confidence intervals for Multinomial distributions

Hi, I'd like to know the formula for calculating the volume of the confidence (rectangular) region for the multinomial distribution. I've already...

• Replies: 0
• Views: 3,369
11-09-2010, 09:50 AM
6. ### Need help with large data set. Nested/factorial??

I'm working with my field data and trying to understand the best way to analyze it. I have: 6 Sites 2 tide-pools per site Each pool has at...

• Replies: 2
• Views: 2,572
11-08-2010, 07:51 PM
7. ### Question about ANOVA alternatives for non-normally distributed data

I am trying to analyze data from an experiment where participants take two reading tests, to compare the effectiveness of two different dictionaries...

• Replies: 0
• Views: 5,667
11-08-2010, 08:58 AM
8. ### Help with choice of nonparametric?

Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

• Replies: 2
• Views: 2,503
11-07-2010, 02:57 AM
9. ### confidence interval GREGG estimator

i have estimated different proportions based on a sample survey. The estimation is done with the GREGG estimator(because of problem with nonrespone)....

• Replies: 0
• Views: 1,635
11-05-2010, 09:01 AM
10. ### Right Sample Size

I am new to this blog and I am trying to learn statistics applied in Market Research. I have the following question: Suppose there is a population...

• Replies: 5
• Views: 5,186
11-04-2010, 12:12 PM
11. ### transformation response and predictors

How to find the proper transformation of the response or predictors ? Is it simply to identify from the diagmostic plot ? Usually I apply...

• Replies: 1
• Views: 3,560
11-03-2010, 03:08 PM
12. ### Linear estimator of mean

Problem is solved! :)

• Replies: 0
• Views: 1,850
11-03-2010, 05:19 AM
13. ### 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: 3,043
11-02-2010, 11:22 AM
14. ### 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: 6,459
11-01-2010, 06:42 AM
15. ### What statistical test and software to use for a Japanese reading comprehension exper?

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• Replies: 0
• Views: 2,044
10-31-2010, 10:29 AM
16. ### 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: 1,542
10-27-2010, 09:35 AM
17. ### 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: 5,175
10-26-2010, 07:24 AM
18. ### 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: 4,069
10-26-2010, 06:19 AM
19. ### 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: 1,637
op1
10-25-2010, 06:54 PM
20. ### 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: 2,837
10-24-2010, 10:24 AM

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: 3,871
10-21-2010, 10:55 PM
22. ### 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: 3,953
10-21-2010, 04:52 PM
23. ### 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: 2,267
10-21-2010, 12:57 PM
24. ### 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: 2,196
op1
10-21-2010, 12:40 PM
25. ### 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: 3,546
10-20-2010, 04:28 PM
26. ### 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: 2,832
10-17-2010, 11:19 PM
27. ### 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: 3,463
10-17-2010, 01:36 PM
28. ### 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: 6,396
10-12-2010, 10:20 PM
29. ### 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: 3,352
10-12-2010, 06:05 PM
30. ### 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: 22,967
10-11-2010, 02:31 PM
31. ### 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: 2,959
10-11-2010, 07:52 AM
32. ### 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: 2,525
10-08-2010, 04:39 AM
33. ### 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: 14,588
10-07-2010, 08:03 PM
34. ### 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: 6,622
10-07-2010, 03:34 PM
35. ### 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: 5,762
10-07-2010, 12:30 AM
36. ### 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: 14,700
10-04-2010, 06:41 PM
37. ### 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: 3,954
10-04-2010, 05:01 PM
38. ### 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: 5,296
10-03-2010, 06:56 PM
39. ### 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: 2,675
10-02-2010, 01:34 PM
40. ### 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: 1,992
10-01-2010, 03:01 PM
41. ### 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: 2,425
09-28-2010, 05:10 AM
42. ### 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: 2,542
09-27-2010, 06:12 PM
43. ### 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: 6,652
09-26-2010, 03:48 PM
44. ### 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: 3,230
09-25-2010, 07:31 PM
45. ### 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: 3,335
09-23-2010, 06:20 PM
46. ### 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: 7,075
09-23-2010, 05:12 AM
47. ### 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: 5,066
Per
09-23-2010, 04:14 AM
48. ### 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: 2,984
09-22-2010, 03:14 AM
49. ### 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: 2,055
hrj
09-18-2010, 03:50 PM
50. ### 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: 1,775
09-17-2010, 01:43 PM
51. ### 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: 9,338
09-17-2010, 11:58 AM
52. ### 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: 1,972
09-16-2010, 01:53 PM
53. ### 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: 1,624
09-15-2010, 04:30 AM
54. ### 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: 2,172
09-14-2010, 02:12 PM
55. ### 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: 3,281
09-13-2010, 08:34 PM
56. ### 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: 2,347
09-11-2010, 10:33 AM
57. ### 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: 7,531
09-10-2010, 03:20 PM

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