1. Announcement:
05-10-2017
Views:
1,828
Page 13 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 ... Last
Threads 721 to 780 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: 18,671
10-11-2014, 12:02 PM
1. ### Test statistic concerning mean comparison of UNKOWN sample distributions?

Hello, all. I'm far from a statistics expert, so excuse me for any inaccuracy that I might say. I'm trying to compare two sample distributions...

• Replies: 3
• Views: 6,023
10-14-2011, 09:03 AM
2. ### Categorical vs Ordinal data analysis

I have a question regarding some data analysis I am conducting. I'm trying to find significance and degree/direction of association between two...

• Replies: 3
• Views: 10,689
04-22-2012, 12:41 PM
3. ### eviews question

Hello everybody, I need fto find evieuws somewhere on the web but i can't find it. Doesn anyone know where i can download for no charge? Thx for...

• Replies: 3
• Views: 5,562
09-28-2011, 06:34 AM
4. ### Two sample tests

Hello, I am looking for differences in continuous variables between two groups: Healthy people and ill people. I have a sample of around 20 ill...

• Replies: 3
• Views: 1,846
07-24-2011, 02:48 PM
5. ### Group theoretic approach to ANOVA

Hello, I have been following the works of Diaconis, Viana and van de Ven and have a query about the approach taken in van de Ven's dissertation...

• Replies: 3
• Views: 1,699
07-28-2011, 03:05 AM
6. ### Minimum Sample Size for a Survey

Hi guys, Here's a question I've been struggling with over the past week. My employer would like to perform a survey to gauge public opinion on a...

• Replies: 3
• Views: 2,651
08-11-2011, 02:21 PM
7. ### DF and fishers vs. pearson's

Hallo everyone I'm having a mental block today, and having trouble getting my df value. So, here's a summary of my data to help: 32...

• Replies: 3
• Views: 2,558
08-29-2011, 12:04 PM
8. ### Normality Assumption

Say there is 100 observations, but these observations are equally broken into 2 genders and 5 cities. When creating a qq plot or just checking...

• Replies: 3
• Views: 2,414
09-01-2011, 01:39 PM
9. ### Fisher's exact test

I have always learned that if you have a contingency table that violates the chi square assumption of more than 20% of cells having expected count...

• Replies: 3
• Views: 8,880
09-01-2011, 02:02 PM
10. ### homogenity of variance

I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

• Replies: 3
• Views: 4,282
09-22-2011, 02:58 PM
11. ### Comparing activity budgets, before and after

Hi all, I am a beginner, so I hope my question is not too stupid. I want to compare activity budgets of animals before and after an event. I...

• Replies: 3
• Views: 3,262
02-08-2012, 03:05 PM
12. ### Which data types & correlation method?

Dear all, I'm a new graduate student and not yet proficient at statistics in research. Please help me confirm/correct the following questions. ...

• Replies: 3
• Views: 12,059
09-28-2011, 11:17 AM
13. ### Factorial ANOVA

I am reading a paper looking at the effect of interventions (an aerobic exercise regime group, a stretching exercise regime group, plus a contol...

• Replies: 3
• Views: 6,045
10-12-2011, 02:49 AM
14. ### Minimum sample size for calculation of guttamns lower bounds?

Hi there, I am in the process of assessing the internal consistency of two tests, test A & B. Both tests are measuring the same thing so I am...

• Replies: 3
• Views: 4,598
10-11-2011, 07:37 PM
15. ### Discrete distribution with var larger than mean

Hi, everyone. Is there any statistical distribution (other than binomial) with its variance larger than its mean? Preferably, a distribution which...

• Replies: 3
• Views: 7,494
10-30-2011, 12:41 AM

Hi, please help me with this simple question that no one at my uni seems to be able to answer! I have 3 groups (n=20) where I'm looking to...

• Replies: 3
• Views: 3,294
11-08-2011, 09:11 PM
17. ### need urgent help

need help Hi, I have found some difficulty in solving this exercise. HINT: Use the fact that T/σ^2~chi-squared (n-1) and the moments of the...

• Replies: 3
• Views: 1,909
11-11-2011, 11:47 AM
18. ### Using a valid researh tool with missing data

Hi guys, During my M.A thesis i've developed a research tool to measure Urabnic gentrification. The tool is build of 10 items - all of them are...

• Replies: 3
• Views: 1,880
11-14-2011, 11:29 PM
19. ### NOOB questions about Mancova, Ancova and multiple regression

I'm a beginning grad student and having a tough time understanding how test results determine if there is reliability and validity. In the study...

• Replies: 3
• Views: 3,582
12-02-2011, 09:58 AM
20. ### Statistical analysis for Rubric Based Research

There are 26 participants who have participated in my research. Each participant treated with a lab module (Hands on Robotics Session). Now each...

• Replies: 3
• Views: 2,963
06-17-2012, 08:48 PM
21. ### statistical methods for detecting the end of event

could someone help me to propose to me different methods of detecting the end of an event example sequential test of wald have you other methods to...

• Replies: 3
• Views: 1,813
12-13-2011, 07:51 PM
22. ### Need help on normalizing data

I have very limited knowledge on statistics, but I need to approach the following question, can any expert here show how to approach it? I have 2...

• Replies: 3
• Views: 5,143
12-15-2011, 04:17 PM
23. ### Limiting distribution of score variable

Prove that \frac{1}{\sqrt{n}}\left (\sum_{i=1}^{n} \frac{\partial l(X_{i};\theta )}{\partial \theta } \right...

• Replies: 3
• Views: 1,611
12-18-2011, 08:00 PM
24. ### Interpreting independent t-test result!

Alright , i had posted a t-test with nonsensical results earlier. There was some installation problem with SPSS and i computed again after installing...

• Replies: 3
• Views: 4,016
12-29-2011, 11:10 AM
25. ### Kernel Density Estimation (KDE)

I feel unsure as to what is the minimum number of genuine (real life) data points needed to applied the procedure and estimate the curve. Any...

• Replies: 3
• Views: 2,651
01-03-2012, 07:08 PM
26. ### Non-normality revisited

We had a debate on whether normality is required for OLS regression a while back. I ran across this in a book on regression. One of the authors (Ali...

• Replies: 3
• Views: 1,861
01-17-2012, 08:46 AM
27. ### In dire need of help!

I took Stats 1 3.5 years ago and somehow the college forgot to mention i needed stats 2 to graduate and am now in it. I AM SO LOST and I have a...

• Replies: 3
• Views: 4,885
01-27-2012, 05:01 AM
28. ### Statistical testing with very small sample

Hi all, I have a problem which wasn't covered by any of my econometrics classes. I am going to run an economic experiment. Unfortunately, I just...

• Replies: 3
• Views: 2,587
01-30-2012, 03:21 PM
29. ### Confidence interval and P-value

Hello Guy’s thanks for your help in advance I am working on a research paper. I have large set of data (50,000) which allow me to use normal...

• Replies: 3
• Views: 2,301
02-08-2012, 11:48 AM
30. ### Comparing pretest and posttest measures of intervention group with control

Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

• Replies: 3
• Views: 4,358
02-27-2012, 12:05 PM
31. ### Comparing responses on 5-point scale

Hi All, I have administered a 5-point scale on my participants which they answered on 10 value items- can I assume this is interval data? I have...

• Replies: 3
• Views: 2,418
04-05-2012, 03:26 AM
32. ### How to test this kind statistical hypothesis ?

Hey. How can I test H_{0} \: : \;\;\; \frac{\mu_{1} + \mu_{3}}{2}=\mu_{2}?

• Replies: 3
• Views: 1,864
04-15-2012, 09:59 AM
33. ### Estimating a pdf from binomial trials - point me in the right direction?

Hi, I'm afraid I'm not an expert in statistics, but I have a particular problem I'm interested in solving. I'm pretty sure this area already has a...

• Replies: 3
• Views: 1,457
04-27-2012, 12:34 PM
34. ### Problem with allocating data

Hello, Im currently writing my bachelor thesis in statistical finance and i have run into a small problem. I want to evaluate forcasts from my...

• Replies: 3
• Views: 1,849
05-07-2012, 03:11 AM
35. ### What is the point of providing p-values for baseline characterisitics?

I just have a general question about what the point is of have baseline characteristics and then presenting p-values for these. Is the p-value...

• Replies: 3
• Views: 8,262
05-29-2012, 02:13 PM
36. ### Binary logistic regression with no significant predictors

Hi everyone, I have a question for logistic regression but i guess it applies to all kinds of regression analysis. I have a model with many...

• Replies: 3
• Views: 11,110
05-19-2012, 06:43 AM
37. ### Chi square test for ordinal variables

Hey all, I have a question regarding the chi-square statistics. I have a total sample size of more than 4,000 and I have 2 groups (2 different...

• Replies: 3
• Views: 4,000
06-03-2012, 04:38 AM
38. ### Appropriate form of ANOVA when blocking

Hi, I'm new to this forum (and relatively new to statistics) and have a question :) I have a text book that outlines the following experiment: ...

• Replies: 3
• Views: 1,640
06-21-2012, 03:51 AM
39. ### How robust is ANOVA's F-statistic?

Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

• Replies: 3
• Views: 3,194
06-29-2012, 01:48 PM
40. ### Bayesian Statistics

Hello I need an example, as simple as possible to Bayesian analysis. I was thinking about a simple proportion problem, perhaps with a credibility...

• Replies: 3
• Views: 2,066
08-25-2012, 07:14 PM
41. ### Doubts analyzing Likert scales

Hi all, I thought about analyzing results from Likert scale using Kruskal-Wallis, but the more I read about it, the more confused I get. People...

• Replies: 3
• Views: 4,511
07-12-2012, 09:01 PM
42. ### Distribution of estimator (exponential distribution; truncated at both ends)

Good day forum, I've been struggling with for a while and would like to hear some thoughts on this one. I've got an exponential distribution,...

• Replies: 3
• Views: 1,678
11-05-2012, 01:57 PM
43. ### breaking data into training and testing (hold-out) sets

Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare the predictive...

• Replies: 3
• Views: 2,718
07-21-2012, 04:47 PM
44. ### Citation needed for removing 3 Stdev outliers

Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

• Replies: 3
• Views: 2,690
07-30-2012, 04:51 PM
45. ### Sampling sizes and significance

Hi all, I got a question hoping someone can help me out. I use this site to calculate my sample sizes http://www.raosoft.com/samplesize.html ...

• Replies: 3
• Views: 1,980
08-10-2012, 08:59 AM
46. ### Comparison of 20 serum chemistry analytes of reptile blood at time 0 and time 1 hour

Dear All, I am having troubles in analyzing results of one study: I want to evaluate the effect of time (1 hour) on 20 analytes (e.g. pH, BUN,...

• Replies: 3
• Views: 1,679
08-30-2012, 06:09 PM
47. ### MANOVA vs multiple ANOVAs

Hello, I have 3 variables that have been measured on 4 occasions and a sample size of 16. I was considering a repeated measures MANOVA to...

• Replies: 3
• Views: 2,381
08-24-2012, 01:41 AM
48. ### Want to be researcher- needs help

Hello all! I am currently designing my first research project and am confused on what to do after I have my data. I have a basic understanding of...

• Replies: 3
• Views: 1,952
09-05-2012, 02:08 PM
49. ### kappa intra observer error test on ordinal

hi, sorry if this is all wrong ive never done stats or posted on this forum. im writing my masters dissertation in bioarchaeology and have a...

• Replies: 3
• Views: 4,361
09-11-2012, 12:23 PM
50. ### To combine or not to combine standard deviations?

Hi, I'm testing the effect of 115 Chinese herbs on bacterial biofilms. I have been carrying out my experiment in microtiter plates and...

• Replies: 3
• Views: 1,983
10-14-2012, 12:15 AM
51. ### Methods help: How to find significant differences between groups with ordinal data?

In examining how students performed at the detail level of an assignment, I have received data that is essentially in the form of a checklist....

• Replies: 3
• Views: 2,619
10-26-2012, 11:32 AM
52. ### Frequency data analysis - repeated measures, between groups

Hi, I am using SPSS and testing frequency data before and after a treatment, plus follow-up. The variable I am looking at is frequency of symptoms...

• Replies: 3
• Views: 1,474
11-01-2012, 06:17 PM
53. ### Survey Design

Dear All, I would like to design a big survey. The population is around 70 million which is the whole country. The purpose of the design is to ask...

• Replies: 3
• Views: 1,726
10-22-2012, 01:18 AM
54. ### How many subsamples from large sample should I draw?

Hi, I am working on an analysis where I compare 2 different samples, one Dutch and one US sample. The US sample is bigger than the Dutch sample...

• Replies: 3
• Views: 1,627
12-14-2012, 05:24 AM

Hi, We are doing a customer satisfaction analysis of our school canteen. We have made a factor analysis and made the factor scores. Now we...

• Replies: 3
• Views: 1,394
11-29-2012, 03:39 PM
56. ### Minimum # of ____ in SPORTS

Hello all, I am working on something that does not actually involve sports but my situation is exactly like something often used in sports...

• Replies: 3
• Views: 2,063
12-18-2012, 07:59 AM

Page 13 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 ... 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.