1. Announcement:
05-10-2017
Views:
1,852
Page 3 of 54 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 53 ... Last
Threads 121 to 180 of 3193

# 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: 18,694
10-11-2014, 12:02 PM
1. ### Instrumental Variable?

So i have a bunch of variables: religious beliefs (how religious you are) and religious participation (how often you go to church), and demographic...

• Replies: 1
• Views: 3,370
12-17-2008, 01:24 AM
2. ### Two groups & two

Hi Wondering if anyone can help with this one. Well, several really. I am planning to conduct a study examining how easy it is to use two...

• Replies: 0
• Views: 2,176
SML
12-18-2008, 02:00 PM
3. ### "Maximally uncorrelated" representation for a covariance matrix

Hi, I have a question about the covariance matrix from a real-life study in particle physics. I am working on a non-linear fit of a...

• Replies: 0
• Views: 2,148
12-20-2008, 08:16 PM
4. ### Symmetry Model Categorical Data Analysis

Does ANYONE understand the symmetry model for categorical data analysis by Agresti? I have a Likert scale that places students into 4 categories. I...

• Replies: 1
• Views: 3,076
12-29-2008, 12:34 AM
5. ### Power Analysis for SURVEY data

I am doing secondary data analysis on survey data that has a clustered, complex random design. I am using STATA 9.0. For the Power analysis do I use...

• Replies: 0
• Views: 4,090
01-10-2009, 07:31 PM
6. ### Multivariate Statistics: Which is appropriate PCA, DFA, MANCOVA?

Hello there, I am trying to determine which multivariate statistical techniques are most appropriate to address my biological questions and type...

• Replies: 0
• Views: 5,221
01-12-2009, 04:15 PM
7. ### Tricky running mean and standard deviation problem

Hi, I have a pretty tricky problem that I can't seem to solve. The basic problem can be expressed as follows: - I have a stream of data (in my...

• Replies: 8
• Views: 10,037
01-13-2009, 06:00 PM
8. ### Alternative to two-sample t-test when proportions are SMALL (<0.001)

Hi, I'm looking for an alternative to the two-sample (independent) t-test for equality of proportions. The two-sample t-statistic only holds...

• Replies: 0
• Views: 4,315
01-14-2009, 04:15 PM
9. ### 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: 4,036
01-14-2009, 10:27 PM
10. ### How to do this power study?

Suppose I have a function f(x) = { 0 if 0 =< x < 0.5 { Beta=0.5 if 0.5 =< x =< 1 y = f(x) +...

• Replies: 0
• Views: 3,008
SVM
01-17-2009, 11:22 PM
11. ### Randomization in an experiment

Hi, everyone. I know randomization is basically to help guarantee that the experiment at hand doesn't systematically favor any condition over...

• Replies: 0
• Views: 3,551
01-19-2009, 12:19 AM
12. ### Repeated measurements are negatively correlated

I have a set of data on 9 subjects. A measurement is taken every week for 10 consecutive weeks. Say I would like to compare the measurements taken on...

• Replies: 0
• Views: 2,316
01-20-2009, 03:07 AM
13. ### Where do I start?

Hi! I'm feeling overwhelmed here and don't know where to start. It is the second message regarding my project and any additional help would be...

• Replies: 1
• Views: 3,174
01-21-2009, 09:40 AM
14. ### 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: 3,439
01-22-2009, 02:09 AM
15. ### Longitudinal Regression Issue

Hi there, I am conducting a hierarchical longitudinal regression over an 18 month time span. I have main effects, quadratic terms and interactions...

• Replies: 1
• Views: 2,859
01-22-2009, 02:16 AM
16. ### Help on Factor analysis and Extension

Hello frnds , Recently we had done a project on Factor analysis approach to understand the indian consumer behavior Our survey questioner...

• Replies: 8
• Views: 5,217
01-26-2009, 12:28 PM
17. ### Normal? Bimodal normal? Some other distribution?

Hello! I am a newbie here. First I want to say HI to everyone! :) And I do have a question here. I am trying to model my data that ideally is...

• Replies: 4
• Views: 18,335
01-28-2009, 08:31 AM
18. ### Hierarchical Cluster Analysis: which method to use?

Hi all, I have a data set consisting of 32 records (linguistic constructions) and count data on how often each construction is used for each of 5...

• Replies: 2
• Views: 5,153
01-29-2009, 04:49 AM
19. ### reporting statistical results

I am wondering if this is the correct way of reporting significnat differences between correlations: "Conversely, males’ self-serving cognitive...

• Replies: 2
• Views: 4,061
02-09-2009, 10:12 AM
20. ### testing

I am new to thread but wondering how I would go about testing inferentially a hypothesis for a research paper. It would be regarding productivity as...

• Replies: 0
• Views: 2,389
02-09-2009, 11:06 PM
21. ### variables in linear mixed model

Hello, I'm performing a longitudinal study, that compares computer use duration measured by 2 different methods: by questionnaire and computer...

• Replies: 0
• Views: 2,466
02-11-2009, 10:27 AM
22. ### Complementary log log

Hi I have a model with a binomial error distribution. Instead of the logit link I use the complementary log log. What is the interpretation of...

• Replies: 1
• Views: 4,745
02-12-2009, 04:09 PM
23. ### is it possible to have multiple mediators that all fully mediate

I have a situation where I found my two mediators are both full mediators Does it make sense? I would think there should be only one full mediators...

• Replies: 1
• Views: 2,775
02-14-2009, 03:15 AM
24. ### 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: 2,706
02-20-2009, 02:07 AM
25. ### Testing change between 2 samples at 2 periods of time

Hi Id wonder if anyone could help me. Im having one of those brain freeze moments when you think you may know the answer but really would...

• Replies: 0
• Views: 4,275
02-20-2009, 02:54 AM
26. ### Granger Causality test help!

I have run a Granger causality test on two time series but im not sure based on the output whether or not to reject the null hypothesis. Below is the...

• Replies: 0
• Views: 5,250
02-21-2009, 01:38 PM

I am an elementary school teacher and know next to nothing about statistics. It's been over 15 years since I was in a statistics class. I am working...

• Replies: 1
• Views: 2,784
02-21-2009, 05:37 PM
28. ### 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: 4,889
02-24-2009, 03:05 AM
29. ### 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: 8,669
02-24-2009, 05:55 AM
30. ### Videopods

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

• Replies: 0
• Views: 2,106
02-25-2009, 12:15 PM
31. ### 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: 2,307
02-28-2009, 08:35 PM
32. ### 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: 4,213
03-01-2009, 07:22 PM
33. ### 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: 2,904
03-02-2009, 12:52 AM
34. ### 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: 6,860
03-02-2009, 10:30 AM
35. ### 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: 4,018
03-04-2009, 12:39 AM
36. ### 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: 9,600
03-06-2009, 02:57 PM
37. ### 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: 2,435
03-06-2009, 04:22 PM
38. ### 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: 2,565
03-07-2009, 10:56 AM
39. ### 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: 1,812
03-07-2009, 08:35 PM
40. ### 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: 2,411
03-08-2009, 03:38 AM
41. ### 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: 9,641
03-09-2009, 08:41 AM
42. ### 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: 2,223
03-09-2009, 02:33 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: 5,681
03-10-2009, 04:57 PM
44. ### 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: 2,752
03-10-2009, 05:55 PM
45. ### 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: 3,760
03-11-2009, 05:40 PM
46. ### 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: 2,181
03-12-2009, 02:02 AM
47. ### 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: 4,703
03-15-2009, 10:11 AM
48. ### 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: 5,905
03-16-2009, 05:52 AM
49. ### 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: 3,725
03-16-2009, 11:07 AM
50. ### 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: 2,296
03-16-2009, 02:46 PM
51. ### 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: 3,128
03-20-2009, 04:19 PM
52. ### 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: 3,497
03-23-2009, 06:18 PM
53. ### 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: 3,761
03-25-2009, 04:10 AM

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: 1,624
03-25-2009, 11:08 PM
55. ### 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: 10,275
03-25-2009, 11:55 PM
56. ### 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: 5,521
03-26-2009, 08:12 AM

Page 3 of 54 First 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 53 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.