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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: 19,447
10-11-2014, 12:02 PM
1. ### 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: 3,932
05-20-2009, 09:13 AM
2. ### 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: 4,885
05-19-2009, 11:19 AM
3. ### 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: 2,194
05-19-2009, 07:34 AM
4. ### 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: 2,199
05-12-2009, 09:41 PM
5. ### 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: 2,949
05-12-2009, 08:55 PM
6. ### 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: 2,647
05-12-2009, 08:03 AM
7. ### 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: 1,676
05-11-2009, 04:14 PM
8. ### 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: 4,323
05-10-2009, 09:12 PM
9. ### 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: 2,247
05-10-2009, 02:42 PM
10. ### 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: 5,162
05-09-2009, 07:40 PM
11. ### 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: 2,063
05-09-2009, 08:46 AM
12. ### 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: 9,838
05-08-2009, 06:17 AM
13. ### 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: 3,917
05-08-2009, 05:11 AM
14. ### 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: 19,489
05-08-2009, 03:43 AM
15. ### 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: 3,060
05-06-2009, 05:20 PM
16. ### 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: 9,002
05-03-2009, 06:41 PM
17. ### 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: 20,917
05-03-2009, 07:26 AM
18. ### OLS assumptions after estimating robust standard errors

Hello everybody, To counter problems with outliers and heteroscedasticity, I have computed an OLS with robust standard errors (using the "robust"...

• Replies: 1
• Views: 3,369
05-01-2009, 12:43 AM
19. ### Current Commentary Study

Hi what is it a Current commentary study ??? What does it mean ??? Regards

• Replies: 2
• Views: 3,042
04-30-2009, 07:52 AM
20. ### Obtaining Residuals in Chi Square Goodness of Fit

Another question re: goodness of fit testing, Is the procedure for obtaining standardized residuals the same ? The PhD student who leads the...

• Replies: 4
• Views: 4,726
04-28-2009, 11:01 AM
21. ### What statistic to use?

I am reviewing the statistics we currently use at work to ensure that we are using the correct statistics. The scenario is: a. We produce...

• Replies: 1
• Views: 3,611
04-28-2009, 01:13 AM
22. ### Is the 2-independent group T test ok?

I would like a suggestion on what analysis to run for my data, and whether a 2-independent sample T test is ok to do because my dependent variable is...

• Replies: 0
• Views: 2,775
04-25-2009, 03:40 PM
23. ### Sampling Method? Too many schools to sample

I am part of a research team looking at the outcomes of a homework help program and would like to make a few suggestions of how to generate data. ...

• Replies: 0
• Views: 2,474
04-24-2009, 11:07 AM
24. ### Meta-analyses

Hi following you, is there a minimum of paper / study / publication to write a meta-analyse ??? Do you know something to evaluate a meta-analyse...

• Replies: 0
• Views: 2,168
04-21-2009, 09:15 AM
25. ### statistical power of a General Linear Mixed Model with repeated measurements

Hello, I would like to be able to calculate the statistical power of a General Linear Mixed Model. This model is applied on longitudinal data on...

• Replies: 0
• Views: 3,975
04-15-2009, 07:37 AM
26. ### What kind of sample is this one?

I am doing some research so I need an information about how to describe this sample: 1. respondents were drawn from internet providers which have...

• Replies: 0
• Views: 2,421
04-11-2009, 08:28 AM
27. ### Help: relationship between Regime type and war

Hy guys, i have a question and it's really important. I have to study the relationship between regime type and intrastate war. the dataset from...

• Replies: 0
• Views: 2,626
04-08-2009, 10:21 AM
28. ### Calculating a P-value for a two-tailed One-Standard-Deviation chi-square Test

How does one calculate a P-value for a two-tailed One-Standard-Deviation chi-square Test? Before we begin, I would like to say thank you for...

• Replies: 0
• Views: 12,594
04-04-2009, 12:32 PM
29. ### Two Variables, Many Components :( Type 1 Error?

Hey, Have spent ages trawling through the threads before I decide I would have to bother everyone with yet another question from a dissertation...

• Replies: 0
• Views: 2,763
03-28-2009, 09:11 AM
30. ### Changing from 5-point to 3-point scale

We are considering changing our guest satisfaction survey from a 5-point scale to a 3-point scale. What is the likely affect on "Top Box" scores? In...

• Replies: 0
• Views: 5,860
03-26-2009, 08:12 AM
31. ### Difference in coefficients between regressions?

Hi - I'm looking for a way to test whether the beta coefficients are significantly different between two regression analyses. For example:...

• Replies: 1
• Views: 10,574
03-25-2009, 11:55 PM

Hi, im new to this forum and i am a psychology student who is in the middle of my dissertation and it has reached the point that i need to start my...

• Replies: 1
• Views: 1,698
03-25-2009, 11:08 PM
33. ### Scaling technique

A friend of mine, a Ph.D. student, seeks my advice on the appropriate scaling technique that can be used for his research. The research involves...

• Replies: 0
• Views: 3,853
03-25-2009, 04:10 AM
34. ### About the distribution of confidence interval for Weibull

Does anyone have an idea about the distribution of the 95&#37; confidence intervals for a population with a Weibull distribution? Thanks in advance!

• Replies: 0
• Views: 3,653
03-23-2009, 06:18 PM
35. ### Isotonic Regression

Hello, I would like to ask if someone knows the answers to the next questions: 1. When do I use Isotonic Regression and why ? 2. What's the...

• Replies: 0
• Views: 3,248
03-20-2009, 04:19 PM
36. ### Testing for Developmental Significance

Please help with my current research analysis. I am studying university students' frequency us, confidence, and success at various study...

• Replies: 0
• Views: 2,513
03-16-2009, 02:46 PM
37. ### might be a stupid question...

I am comparing 2 groups (matched sample) with t-tests and am noticing that there is no significant difference. However the st. deviations of each...

• Replies: 2
• Views: 4,234
03-16-2009, 11:07 AM
38. ### Conjoint analysis

....i need some insight please... those familiar with conjoint, though i don't have any statistical package to run on it, so my plan was to do...

• Replies: 4
• Views: 6,181
03-16-2009, 05:52 AM
39. ### Jackknife

I tried to find a specific example of an application of the 'jackknife' command on google, but didn't find any so far. Someone has one? For...

• Replies: 2
• Views: 4,862
03-15-2009, 10:11 AM
40. ### best presentation of data to aid analysis

Hello, I need some help with formulating a methodology for my current dissertation. I am investigating the impact of ability setting on students....

• Replies: 0
• Views: 2,288
03-12-2009, 02:02 AM
41. ### Finding relationship between 2 curves over time

Hi guys, Awesome forum! My question does not look too complicated, but around my research centre here nobody knows what to do with my problem......

• Replies: 1
• Views: 3,911
03-11-2009, 05:40 PM
42. ### Need large data sets

Hello, I'm doing some Q/A work on a new app for data visualization. I can generate my own random data sets, but I'd like to use some real-world...

• Replies: 2
• Views: 2,944
03-10-2009, 05:55 PM
43. ### Are there any post hoc analyses for Chi Square data?

Hi, I've got some Chi square results that I would like to analyze post hoc. Any ideas? I've got categorical data. Kind regards Brionny

• Replies: 2
• Views: 6,005
03-10-2009, 04:57 PM
44. ### Which test should I use?

Hi I made repeat measurements of depth and velocity at ~700 locations in a river at three different flow rates. The data was clustered at each...

• Replies: 1
• Views: 2,378
03-09-2009, 02:33 PM
45. ### Event Clustering in an Event Study

Dear All, I conducted an Event-Study to assess price effects. Now the result show widely fluctuating abnormal returns. Since the event-date across...

• Replies: 1
• Views: 10,008
03-09-2009, 08:41 AM
46. ### Help in study design! URGENT!

Suppose I do a retrospective review of patients records of two groups of patients.. one with diagnosis A and the other group with diagnosis B. And I...

• Replies: 0
• Views: 2,608
03-08-2009, 03:38 AM
47. ### Help?

I have a survey of college students in which I created individual weights to account for differences in Age, Gender, Race, and degree level, so...

• Replies: 0
• Views: 1,912
03-07-2009, 08:35 PM
48. ### need urgent help! how analyze data?

Hi there, I hope anyone can help... Have been looking up text-book after text-book without getting the info I need! I am trying to analyze some...

• Replies: 0
• Views: 2,729
03-07-2009, 10:56 AM
49. ### Dissertation confusion!

Hi there guys, i'm new so hopefully i'll get enough information down here for you, any questions then just ask! Ok so here's the deal... i'm a...

• Replies: 0
• Views: 2,530
03-06-2009, 04:22 PM
50. ### stat treatment for yes no questions

I'm an education student and doing a thesis on vocabulary competence of select students. I only know basic statistics. What statistical treatment is...

• Replies: 2
• Views: 10,016
03-06-2009, 02:57 PM
51. ### Appropriate Statistical Analysis

Hello, I am getting ready to take comprehensive exams for my Master's Degree and have not had statistics in four years. I need some assistance in...

• Replies: 4
• Views: 4,231
03-04-2009, 12:39 AM
52. ### hypothesis testing for least squares fitting

I have a spectrum that is composed of several things. I do least squares fitting in order to determine the amount of each component. For example: ...

• Replies: 8
• Views: 7,392
03-02-2009, 10:30 AM
53. ### Discriminant analysis with mostly incomplete cases

Hello. I have a bit of a biostats problem. I’ve got data on 5 groups and 15 species. There are 9 variables, and 1000 cases total. The problem,...

• Replies: 6
• Views: 3,130
03-02-2009, 12:52 AM
54. ### How do i add 5 spss freq count tables together?

Please can anyone help? I use spss (DOS version) and need to add five variables together. THey are all the same and contain the same values. When...

• Replies: 1
• Views: 4,367
03-01-2009, 07:22 PM
55. ### Learning More... but where?

Hey y'all, I've been reading quite a few posts for awhile and it's been really neat to see people talking about statistics in such an invested...

• Replies: 4
• Views: 2,369
02-28-2009, 08:35 PM
56. ### Videopods

Is anyone aware of any videopods that cover econometrics courses (especially time series and cross sectional analysis?

• Replies: 0
• Views: 2,185
02-25-2009, 12:15 PM
57. ### Logistic regression - different cutpoints for classification and probability?

I was reading an article on logistic regression tonight, and I noticed the following: "Logistic regression can be used to classify observations as...

• Replies: 2
• Views: 8,820
02-24-2009, 05:55 AM
58. ### studying half-hourly time series

hello, I have to study a time serie composed of half-hourly data concerning electric load for the period of 6 years : so in my file data i have...

• Replies: 5
• Views: 5,062
02-24-2009, 03:05 AM

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