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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: 18,620
10-11-2014, 12:02 PM
1. ### What N to record for regression table?

Is it the outcome variable (dependent variable) N that I report in a regression table?

• Replies: 0
• Views: 1,904
08-20-2009, 07:08 PM

I have just obtained the output for a one way repeated measures ANOVA and have read that it is useful to report the size of the effect using omega...

• Replies: 0
• Views: 5,710
08-20-2009, 03:28 PM
3. ### Violation of sphericity...

If you seem to be violating the assumption of sphericity when undertaking several separate one way repeated-measures ANOVAs and therefore have to...

• Replies: 0
• Views: 3,778
08-20-2009, 03:26 PM
4. ### bounds of beta distributions

I'd like to estimate the lower and upper bounds of a general beta distribution, using 5 and 95 percentiles. I already know how to estimate the mean...

• Replies: 0
• Views: 2,136
08-20-2009, 11:20 AM
5. ### Multiple Comparison Correction - Help needed !

I know the concept that one should have statistical correction if multiple comparison are made between means. Such as the well-known bonferroni...

• Replies: 1
• Views: 4,012
08-20-2009, 09:42 AM
6. ### Fisher information matrix

Hello everybody, I read here that the Fisher information matrix was the inverse of covariance matrix. How can I show that ? My definition of...

• Replies: 0
• Views: 4,203
08-20-2009, 09:01 AM
7. ### comparing means\unequal(small) size group

Hi, I am about to use student t test to compare the mean of two independent groups. The first group sample size is 4 and another one is 24. Can I...

• Replies: 4
• Views: 26,261
08-18-2009, 12:00 AM
8. ### Research Question

Hey Everyone hopefully you can help me. My last hope ;-). For a Stat's and Research Exam (on Monday) I need to answer the following questions: Draw...

• Replies: 0
• Views: 2,429
08-14-2009, 05:28 AM
9. ### Gumbel Copula

Does anybody have some code or a paper to show how to simulate n dimensional Gumbel copula ?

• Replies: 0
• Views: 2,375
08-12-2009, 02:55 PM
10. ### I have no idea where to start!!

I need to analyse data for research--- There are 3 outcomes (1,2,3) and two companies (a,b) with 3 departments each (a1,a2,a3 and 1b,2b,3b). I...

• Replies: 2
• Views: 2,415
08-05-2009, 05:36 PM
11. ### return series

why does taking a log make a return series continous? ln(r(t)/r(t-1))

• Replies: 0
• Views: 1,816
07-28-2009, 08:22 AM
12. ### How to compute significance here? (And why?)

Hello, method test_set_size correct accuracy A 898 188 0.209 A+ 898 210 0.234 A++ ...

• Replies: 0
• Views: 3,230
07-28-2009, 06:02 AM
13. ### Within Subjects OXO and confounds

Greetings! I'm helping a friend in the medical field with his research and I have an I/O Psych background - meaning lots of regression and...

• Replies: 1
• Views: 3,487
07-19-2009, 09:33 PM
14. ### F-value and Post-hoc tests conflict

What does it mean when you obtain a significant F-value for an ANOVA but when you perform the post-hoc test no pairwise comparisons are significant?...

• Replies: 0
• Views: 3,869
07-17-2009, 02:40 PM
15. ### Using Linear slope estimate as independent variable in regression analysis

Hi all, I am doing an analysis of longitudinal growth data and would like to compare my methods to other studies but am having trouble finding...

• Replies: 0
• Views: 3,754
07-15-2009, 01:01 AM
16. ### Bonferroni Correction Factor !!!

Hello, What exactly Bonferroni correction factor means? Why we calculate it in our study? Thanks, Bala

• Replies: 9
• Views: 25,671
07-14-2009, 06:33 AM

Hi to all. I desperately need a method to compare positive and negative likelihood ratios of a diagnostic test within two strata (e.g. likelihood...

• Replies: 0
• Views: 2,807
07-13-2009, 07:20 PM
18. ### Powerrankings for Football

This is my 1st post and decided to register. Just wanted to say there is a lot of smart people running around here and i love reading the articles....

• Replies: 0
• Views: 2,280
07-13-2009, 12:20 PM
19. ### Dissertation statistics

Hi, I am currently writing my dissertation on long term effects of CEO successions, ie. are there any statistically significant effects on measures...

• Replies: 0
• Views: 1,890
07-13-2009, 05:21 AM
20. ### Repeated Measures with a baseline Covariate

I am in the final stages (i.e., manuscript is due on July 21) of my dissertation and I am stuck on what seemed to be a minor stats issue. This issue...

• Replies: 0
• Views: 4,692
07-06-2009, 02:46 PM
21. ### confidence interval for combined data

Hi everyone, I'm new here, so forgive me if I don't get something quite right. I have a question for how best to do a confidence analysis of a set...

• Replies: 5
• Views: 8,110
06-24-2009, 02:32 PM
22. ### two probability levels in regression tables

I was wondering if is is common practice to identify betas that are significant at either the .05 and .001 level. e.g., If I decide to set my p level...

• Replies: 1
• Views: 2,962
06-24-2009, 01:24 AM
23. ### MDS with confusion matrix

Hi, I want to run a MDS from some data of close set identification. Therefore, I have a 12X12 confusion matrix and I need to transform it to a...

• Replies: 0
• Views: 2,787
06-23-2009, 07:12 PM
24. ### sample size - power calculations

Hi, would be great if anybody could help me on this. I want to estimate the impact of an independent variable x (lets say a social program) on the...

• Replies: 1
• Views: 4,321
06-23-2009, 12:01 AM
25. ### (non-)parametric test dilemma

I want to compare means of 6 variables and to do correlation analysis. I did Kolmogorov-Smirnov test and it showed that 3 of them are normally...

• Replies: 7
• Views: 7,175
06-22-2009, 07:50 PM
26. ### choosing basic test: logistic regression or multiple chi square?

-------------------------------------------------------------------------------- Hi, I'm new to statistics and am working on a project for...

• Replies: 0
• Views: 3,553
06-22-2009, 10:41 AM
27. ### generate overdispersed poisson data

Hi there, Can anyone tell me how to produce overdispersed poisson data? An algorithm or something? I find it difficult. Thanx in advance for...

• Replies: 5
• Views: 7,078
06-19-2009, 03:17 AM
28. ### Help - problem

Hi I have a variable VA and want to know if there are significant differences in this variable between group A and group B. N = 93 samples...

• Replies: 1
• Views: 2,275
06-17-2009, 10:15 PM
29. ### Suppressor

Hi, I am attempting to conduct a regression analysis in a study examining patient and caregiver variables and their impact on formal care...

• Replies: 2
• Views: 4,122
06-17-2009, 04:18 PM
30. ### Absolute or relative changes?

I would like to compare the changes in salt excretion caused by a saline infusion in a group of patients studied under high sodium and low sodium...

• Replies: 0
• Views: 2,940
06-16-2009, 04:57 AM
31. ### A basic question. Pls help...

Hi, When discussing the large sample theory, the professor in my econometrics course said sth that I found hard to grasp. He said something...

• Replies: 1
• Views: 2,533
06-15-2009, 08:07 PM
32. ### Pairwise comparisons

If anyone has ANY idea at all i would be most appreciative My lab report includes pairwise comparisons, I have the SPSS output before me but I...

• Replies: 2
• Views: 29,378
06-15-2009, 08:05 PM
33. ### 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: 5,741
06-05-2009, 12:15 PM
34. ### Neural Networks

Hi, I am really interested to explore the use of neural network analysis to create a model that predicts my variable. I would like to know if...

• Replies: 0
• Views: 2,448
06-05-2009, 04:38 AM
35. ### Predicting Order of NHL draft

Hi, I'm a huge a NHL fan and I thought it would be interesting to figure out the probability of a particular player being picked at a particular...

• Replies: 0
• Views: 1,916
06-02-2009, 01:02 PM
36. ### school project

Hello, I am doing a project for school and am in need of some advice. I want to do something to do with the gubernatorial primary election in NJ...

• Replies: 0
• Views: 1,994
05-30-2009, 09:33 PM
37. ### VERY RELEVANT MORTGAGE-RESEARCH in this crisis

Within the firm I work for the question exists whether there are common characteristics within (between) more or less 900 cases/dossiers which we...

• Replies: 4
• Views: 3,084
05-27-2009, 08:39 PM
38. ### How to generate right censored data

Hi all, I want to generate some data from a given distribution, let say exponential distribution. But I do not now how. Any help would be...

• Replies: 1
• Views: 5,137
05-27-2009, 04:34 PM
39. ### Non profit Intern needs your help to save the world!!

Hi there, Two (hopefully) simple questions. I've taken Statistics in school however I am an intern at a very small non profit and I just want to...

• Replies: 0
• Views: 2,360
05-27-2009, 08:45 AM
40. ### what test to do?

Hi Would be grateful for a little guidance. I have a set of data with a mix of continous and categorical data I am trying to see if there is...

• Replies: 1
• Views: 1,964
05-24-2009, 03:05 PM
41. ### repeated measures t-test question - Help!

Hi, I have measured various parameters (for example heart rate) in two groups (control and treated) over a time course of 45 minutes, taking...

• Replies: 1
• Views: 3,414
05-22-2009, 10:05 AM
42. ### what test to use?

I have a data set consiting of 50 vegetation plots. I have five possible categories for vegetation cover. Each category can range form 0 to 100% with...

• Replies: 2
• Views: 2,617
05-22-2009, 09:00 AM
43. ### Uncertainty

Hi there, If I take measurements every minute for a whole hour, and I know the uncertainty of a single measurement, is it possible to calculate...

• Replies: 1
• Views: 2,704
05-20-2009, 06:42 PM
44. ### Sample size...

have found numerous on-line calculators and have read through some forum postings but am now more confused than ever. I have been asked to...

• Replies: 1
• Views: 3,585
05-20-2009, 09:13 AM
45. ### low coefficient alpha

Hello, I have a question about coefficient alpha. How does having a low alpha effect your statistical tests if you are running say an ANOVA or a...

• Replies: 0
• Views: 4,513
05-19-2009, 11:19 AM
46. ### Need help on sampling

I am very new to statistics so forgive my ignorance...I just need some help to get pointed in the right direction. I need to take some baseline...

• Replies: 0
• Views: 2,111
05-19-2009, 07:34 AM
47. ### grouping doubt

Hi , I am new to base sas trying to learn on my own , I have a doubt , I have a data set which contains the information about the firms , they...

• Replies: 0
• Views: 2,084
05-12-2009, 09:41 PM
48. ### Can't find a convenient test for this huge dataset :-(

Hi everyone, I have some trouble choosing the right test for the following study: I have a group of parents and a lot of ordinal measures. I...

• Replies: 0
• Views: 2,760
05-12-2009, 08:55 PM
49. ### Cut-off

I am reading an article where 5 has been set as a cut-off score. No > or >= symbols are given, and I don't know whether a score of 5 would identify...

• Replies: 0
• Views: 2,538
05-12-2009, 08:03 AM
50. ### Need a meaningful way to describe heavily-skewed numbers for 50 states

Hi there, I apologize if this is an insultingly stupid question, but I managed to enroll in a political research class that involved very little...

• Replies: 0
• Views: 1,597
05-11-2009, 04:14 PM
51. ### ANOVA v t-test

My understanding is that the t-test is a special case of a oneway ANOVA. I am confused by highly discrepant results when comparing the means of 2...

• Replies: 2
• Views: 3,972
05-10-2009, 09:12 PM
52. ### Multivariate Gaussian Distributions

I am interested in understanding Multivariate Gaussian Distributions. I am a (young) Computer Scientist looking to implement the EM algorithm for...

• Replies: 0
• Views: 2,104
05-10-2009, 02:42 PM
53. ### gender differences

Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

• Replies: 6
• Views: 4,996
05-09-2009, 07:40 PM
54. ### Smoothing algorithm for times series and slope measurement

Hi, I'm doing an experiment that gathers one data point approximately each second. I have plotted all the datapoints on a graph. The graph has...

• Replies: 0
• Views: 1,964
05-09-2009, 08:46 AM
55. ### 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: 9,542
05-08-2009, 06:17 AM
56. ### which correlation for a PCA?

I have data that has both discreet and continuous variables and, that are highly variable, not entirely independent of each other and some aren't...

• Replies: 0
• Views: 3,617
05-08-2009, 05:11 AM
57. ### Is there a minimum number of subjects required for a t-test?

Hi everyone, I am carrying out a piece of research on the effects of heel pain on the way we walk. I have two groups, 8 in the heel pain group...

• Replies: 2
• Views: 18,762
05-08-2009, 03:43 AM
58. ### 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: 2,816
05-06-2009, 05:20 PM
59. ### t-tests or mann-whitney??

Hello, I have a n=12 sample (and a matched-sample of 12)... I was planning on using t-tests, but now reconsidering it. Would it be correct to use...

• Replies: 2
• Views: 8,498
05-03-2009, 06:41 PM
60. ### logistic regression : intercept is NOT significative

Hi everybody I have performed a logistic regression with a stepwise selection. But, at the end, the parameter estimate of intercept is NOT...

• Replies: 5
• Views: 20,174
05-03-2009, 07:26 AM

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