1. Announcement:
05-10-2017
Views:
1,895
Page 19 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 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 ... Last
Threads 1081 to 1140 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: 18,751
10-11-2014, 12:02 PM
1. Panel Data - Pooled OLS vs Fixed Effects vs Random Effects

Hi forummers, I am a finance PhD student and am currently undertaking some statistical analysis of bankruptcy risk. I have data on roughly 500...

• Replies: 2
• Views: 78,890
03-09-2012, 01:54 PM
2. Sample size calculations for randomized controlled clinical trial

Looking for a proper sample size formula for a randomized, double-blind, placebo-controlled clinical trial. There will be three arms for the trial (2...

• Replies: 2
• Views: 10,281
01-31-2012, 07:02 AM
3. Confidence interval for (Xbar-2*Ybar)

Hi, Can any body help me to calculate confidence intervals for (Xbar-2*Ybar), where X and Y are two random variables. Is this as simple as (Xbar -...

• Replies: 2
• Views: 2,366
06-13-2012, 11:06 AM
4. Sensitivity Analysis for Multivariable Problem

Hello all, first off I hope this is in the right forum and thanks for reading. I am a practicing engineer and have run into a problem where I have...

• Replies: 2
• Views: 1,802
01-03-2012, 02:47 PM
5. Modeling residual variance in regression

Hi all Consider an ordinary linear regression model. The residuals are assumed to be normally distributed on N(0,sigma). I believe it is possible...

• Replies: 2
• Views: 3,098
01-05-2012, 10:07 AM
6. Survey Analysis

I have survey results that needs to be analyzed . Basically, survey contains 5 categories and each categorie has some questions. The subjects rated...

• Replies: 2
• Views: 1,561
01-02-2012, 12:16 PM
7. Help with data!!!

Hi, I am new to the forum and would massively appreciate some help with some research I am doing. I am looking at a series of students marks over...

• Replies: 2
• Views: 1,413
01-21-2012, 06:52 PM
8. Variables for INDEX - can I include variables with differents units of measurement?

Hi All, please help with this question. I want to create an index to measure natural resources. Could you kindly advise whether I can include...

• Replies: 2
• Views: 1,781
01-24-2012, 12:31 PM
9. Wilcoxon rank sum test on Cross Validation Results

Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

• Replies: 2
• Views: 2,579
01-31-2012, 03:33 AM

I have sort of a weird question. I am reading a journal article and basically the authors used a Kruskal-Wallis test to compare the median values of...

• Replies: 2
• Views: 2,978
01-31-2012, 01:18 PM
11. Help with interpreting chi-squared

Hello everyone, I am new here, so I hope I'm posting my question in the right section! I'm having trouble interpreting the results of an old...

• Replies: 2
• Views: 2,914
02-04-2012, 12:46 AM
12. Comparing the mean of top and bottom quartiles

Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

• Replies: 2
• Views: 3,923
02-08-2012, 12:45 AM
13. Choice of analysis method and variable skew

Hello, I'm a new poster here, so I apologise if this is not the right place. My problem is as follows: I am conducting research into fatigue and...

• Replies: 2
• Views: 1,993
02-14-2012, 02:30 PM
14. Mahalanobis Distance

Hello, I have a question about working with Mahalanobis distance (MD). The materials I have on the matter say to enter the IVs for the analyses you...

• Replies: 2
• Views: 2,002
02-18-2012, 11:52 AM
15. Chi square contingency table error!

From what I understand of chi square the rows and columns must be data that are categorical. My first question is whether Increase and decrease...

• Replies: 2
• Views: 1,668
02-26-2012, 08:52 AM
16. Analysing an unbalanced factorial design

Hello, I have data from an unbalanced factorial design, and would like some suggestions to analyse them. It is supposed to be 3 x 2 factorial...

• Replies: 2
• Views: 4,296
02-28-2012, 11:43 PM
17. Data transformation and kruskal-wallis

Hi! It's the first time I'm posting in your forum! I'm using statistics in a university project about operations research, and I'm having some...

• Replies: 2
• Views: 2,231
02-28-2012, 12:00 PM
18. Correlation

Hi! I'm currently working on a research..but I'm having problems with correlation. I want to correlate a test with 5 general scales to a test with...

• Replies: 2
• Views: 2,140
03-02-2012, 11:52 AM
19. Correlation coefficient in two groups separately and the collapsed across groups

Hi, I'm having trouble interpreting the results of a test of bivariate correlation. I am computing Pearson's r in a group of 400 as a whole,...

• Replies: 2
• Views: 2,130
03-03-2012, 12:26 PM
20. Sampling problems

Hi, I need to sample randomly my dataset for 1000 times. The sample need to be the 80%. I know how to do that, my problem is that not only I need...

• Replies: 2
• Views: 1,991
03-07-2012, 07:05 PM
21. Algebra of random variables?

Hi Guys, I'm in the field now, so I'm not online much. However I do have a burning question. Does anyone have any book suggestions for me that...

• Replies: 2
• Views: 2,476
03-12-2012, 11:33 AM
22. Correlation between two dependent variables on repeated measures

Hello there! I am trying to see if there is covariation of two variables (anxiety and sleeping heart rate) over multiple days of testing the same...

• Replies: 2
• Views: 10,162
05-02-2012, 06:13 AM
23. Is MANOVA the most appropriate test?

I'm interested in how microphone types affect the result of acoustic analysis measures. I'm looking for the most appropriate statistical test to...

• Replies: 2
• Views: 1,999
03-22-2012, 12:49 PM
24. Wilk s theorem and LR test

Hello, I have first posted the following in the "Statistics help" section, but it might be that it is better to post it here. I have some...

• Replies: 2
• Views: 3,658
03-30-2012, 09:56 AM
25. Data collection???

First off apologies if I should have just posted this in my other thread. I am working with some cycle hire data from the Barclays Bicycle Hire...

• Replies: 2
• Views: 1,484
03-22-2012, 07:52 PM
26. Is Count/Expected Count in Chi Square a good descriptive measure?

I want to simplify these outcomes. Can I simply divide the observed count / expected count to get a sort of 'odds ratio'? I am doing this with +3...

• Replies: 2
• Views: 1,471
03-29-2012, 01:27 PM
27. help with reproducibility and accuracy - influence on sample sze

Statistics query resolved at TalkStats Statistics query resolved at TalkStats Statistics query resolved at TalkStats

• Replies: 2
• Views: 1,228
09-24-2012, 10:38 AM
28. T-test puzzlement

I've been pondering on this for some time and I guess i'm confused because there are so many stats tests out there. Basically my aim is to figure...

• Replies: 2
• Views: 1,657
nom
04-20-2012, 11:43 AM
29. Optimal tests of hypothesis

I have a question about the use of optimal tests of hypothesis in practice. Are they often used in research or in industry? I understand that UMP...

• Replies: 2
• Views: 2,180
04-28-2012, 12:06 AM
30. Bayesian confuson

Hi, I am trying to reconcile what I think are conflicting philosophies in my head about an experiment. The experiment is a hierarchical model...

• Replies: 2
• Views: 1,587
04-29-2012, 10:30 PM
31. presenting results of simple correlations and multiple regressions in the same paper

I recently got comments back from a reviewer on a manuscript, criticizing my use of simple correlation and multiple regression analyses to study the...

• Replies: 2
• Views: 3,131
05-04-2012, 07:55 AM
32. detect mean and variance shifts

from the plotted figure, how i can distinguish what i have to monitor mean or variance to detect a shift from the process

• Replies: 2
• Views: 1,593
05-06-2012, 04:25 PM
33. help in Real survey data analysis‏

would you please guide me to analyze it? i will tell u overall view of the questionnaire and goals and hope to help me how to analyze it the...

• Replies: 2
• Views: 40,897
05-19-2012, 03:47 PM
34. PLS-DA: Are latent variables comparative?

Hello, first post on the forum - hopefully this is the correct place to do this. I've been working on developing an system for visualising the...

• Replies: 2
• Views: 3,454
05-27-2012, 07:40 PM
35. how to interpret 2log(x)?

I have coefficient B for 2 log(x) and was wondering how to interpret it. In this case B=1.9. Thank you for your help.

• Replies: 2
• Views: 1,905
05-26-2012, 11:44 AM
36. Plsr

I know PLSR can deal with multiple dependent variables, how about if let say the 2 dependent variables are totally no relation at all, shall we do...

• Replies: 2
• Views: 1,515
06-12-2012, 11:57 AM
37. Paired t-test VS Anova

I'm reading an article which is comparing the effects of three variables. But the authors used several paired t-tests to measure two variables at a...

• Replies: 2
• Views: 3,306
06-22-2012, 06:37 PM
38. Rule Associations Help

I apologize in advance if this is the wrong section. I'm trying to discover rule associations for a survey with over 140 attributes. All of the...

• Replies: 2
• Views: 1,485
07-05-2012, 10:49 AM
39. Technical name - Is this a 'multi-level model'?

Hello. I am hoping that someone can tell me the technical name for the following type of analysis. I have a sense that it may be a 'multi-level'...

• Replies: 2
• Views: 2,532
07-28-2012, 01:15 AM
40. What model for small sample?

Hi! I have 59 observations of farmers' annual net income (which is representative) and I want to see the effect of 15 independent variables, such...

• Replies: 2
• Views: 1,937
08-05-2012, 08:40 AM
41. Post Hoc

If you have two groups for the I.V. (i.e. Men and Women) and one D.V. is it possible to run just a Post Hoc test? Isn't that the same as a T-test? ...

• Replies: 2
• Views: 1,358
08-09-2012, 10:17 PM
42. Help with interpreting simple chi-square!

Hi everyone, I ran a simple experiment on whether blame for failures in relationships was seen to be internal or external, and these were the...

• Replies: 2
• Views: 2,553
08-11-2012, 12:48 PM
43. Help with test interpretation

Hi all I'm doing some research and have run a few kolmogorov- smirnov tests on my data. My question is whether the magnitude of the values have...

• Replies: 2
• Views: 1,693
08-17-2012, 01:00 PM
44. Which tests? Clarification plz!

Hi all! I’m currently doing some research and I’m a bit of a novice so wanted to check if I was on the right lines with the statistical tests I’m...

• Replies: 2
• Views: 1,928
08-17-2012, 01:18 PM
45. Estimating parameters using a different method?

Hi, I have a probability distribution which has two parameters \alpha and \beta I re-parametrized the distribution such that the new...

• Replies: 2
• Views: 1,115
08-16-2012, 08:43 AM
46. Autocorrelation of panel data: need literature!

I have (so-called) dynamical monte carlo model of a number of identical chains within simulation box And i've measured some data (like radius of...

• Replies: 2
• Views: 1,858
08-24-2012, 11:38 AM
47. Pearson's chi-test for more than 2x2

So, I have one stat book (Discovering Statistics by Andy Field; great book) that discusses Pearson's chi-test and how it's only applicable to a 2x2...

• Replies: 2
• Views: 3,010
08-23-2012, 04:30 AM
48. What test to use?

I wonder if there are demographic variables (e.g., level of training, place of practice, age served) that determine knowledge on suicide. In my...

• Replies: 2
• Views: 1,824
08-27-2012, 09:30 AM

(This was posted in a different sub-section of the forum, but has remained unanswered for over a month. I'm posting it here in the hopes of getting a...

• Replies: 2
• Views: 1,248
09-30-2012, 11:35 PM
50. Which test for manipulation check?

In my research, 6 different scenarios were randomly assigned to the participants. The scenarios consisted of 2, 4 of 6 items and if these items were...

• Replies: 2
• Views: 10,825
08-31-2012, 02:25 AM
51. Bayesian model checking: a problem with Gelman's chi-squared test

So, I foolishly tried to implement a test Gelman and his colleagues propose to determine whether observed data actually fits a model (Bayesian Data...

• Replies: 2
• Views: 2,671
09-11-2012, 09:21 PM
52. [SOLVED] help with some sums and squares please? :)

hey everyone! how are you all doing? so... thing. i'm having trouble following the algebraic steps on an article i'm reading. my math sumation...

• Replies: 2
• Views: 2,910
09-26-2012, 05:51 PM
53. Multiple comparisons problem

Dear all, In my research I frequently work with multi-channel EEG data, which yield data that are often subject to the multiple-comparisons...

• Replies: 2
• Views: 1,499
10-01-2012, 07:54 AM
54. Find Total Utility Consumed

Hi, I have snapshots of electricity cosumption data. For eg. at 4:00 am, the consumption is 3000 kw at 4:15 am, the consumption is 15205 kw at...

• Replies: 2
• Views: 1,120
09-30-2012, 11:23 PM
55. data analysis for likert scale

i have a group of variables being measured on a likert scale from 1 to 5, the agreement or disagreement of these variables will help me know the...

• Replies: 2
• Views: 1,678
10-01-2012, 08:39 AM

Page 19 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 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 ... 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.