1. Announcement:
05-10-2017
Views:
1,792
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: 18,645
10-11-2014, 12:02 PM
1. ### Can I ignore the third independent variable?

Hi all! Here's some background: I have measured 103 patients' postural steadiness. The independent variables (or within-subject factors) in my...

• Replies: 0
• Views: 2,281
01-16-2012, 09:01 AM
2. ### Factor scores to classify groups?

Hi there, I have carried out a principal component analysis and I would like to use the factor scores to classify 5 groups of respondents. What...

• Replies: 0
• Views: 2,086
gav
01-16-2012, 10:03 AM
3. ### method comparison/agreement

I have two methods I want to compare, normally I would use the Blamd and Altman approach to agreement, however in this case the two methods that I...

• Replies: 1
• Views: 2,016
01-16-2012, 05:18 PM
4. ### 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: 1,860
01-17-2012, 08:46 AM
5. ### Bradley-Terry model and the difference between football goals?

Hi everyone ! I'm actually working on the Bradley-Terry model, and I cannot find any answer for my problem... Perhaps you can help me ?! The...

• Replies: 0
• Views: 1,524
01-18-2012, 01:08 PM
6. ### parceling

Hi, I've already posted this in the Psychology Statistics, but I am not sure if this was the right forum. Here are my questions again: I am...

• Replies: 0
• Views: 1,404
01-19-2012, 10:34 AM
7. ### Two-dimensional outlier detection

Hi all, I was wondering if you could give me some suggestions to detect two-dimensional outliers, i.e. for values depending on the variables. A...

• Replies: 1
• Views: 3,397
01-19-2012, 01:06 PM
8. ### Scientific Theories

When evaluating a theory, which of these criteria do you think is the most important, the least important, and why? Do all of these criteria need to...

• Replies: 9
• Views: 3,568
01-19-2012, 02:40 PM
9. ### queuing theory

I have to solve this exercise and i stuck any help??? we have 20 scietists arrive per hour and the x-ray station can proccess 45 employees per hour....

• Replies: 0
• Views: 1,303
01-19-2012, 03:21 PM
10. ### Hypothesis about bus arrivals distribution

Hi I have collected data in the bus stop registering bus arrival times. Now I want to find the distribution that fits to this data. Trying in...

• Replies: 1
• Views: 2,179
01-20-2012, 03:52 PM
11. ### 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: 1,389
01-21-2012, 06:52 PM
12. ### Difficulty with Rank-biserial correlation coefficient, N = 5

Hi there, I am calculating Difficulty with Rank-biserial correlation coefficients in a spreadsheet using the following formula: rb = (2/n)*(Y1...

• Replies: 6
• Views: 7,783
01-22-2012, 08:49 PM
13. ### Research Ethics

If allowed, should animal research be limited to research that investigates cures for terminal illnesses, or should they continue to be used in any...

• Replies: 13
• Views: 3,637
01-23-2012, 09:06 PM

Hi All, I am about to be dismissed from my program because I can't get my stats right on my concept paper. I hired a statistician to help me, but...

• Replies: 0
• Views: 509
01-23-2012, 09:36 PM
15. ### Sample Size Help

I am looking for some help. I am a marketer so I know just enough about stats to be dangerous, but I have an real life problem. I am mailing...

• Replies: 4
• Views: 1,830
01-24-2012, 12:24 PM
16. ### 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: 1,762
01-24-2012, 12:31 PM
17. ### Help need on 'Panel Corrected Standard Errors' in SAS

I have panel regression to estimate with time fixed effects and correcting standard errors using 'Panel Corrected Standard Errors', where PCSE...

• Replies: 0
• Views: 3,140
01-24-2012, 02:25 PM
18. ### Help to compute expected value of matrix product

Hello, I have this problem to solve which is driving me crazy: I have the following matrices g = ' where .* here means Hadamard product and...

• Replies: 0
• Views: 3,306
01-25-2012, 05:56 AM
19. ### Time series analysis to test a system:This seems too simple. Have I missed something?

I wish to test whether or not Performance Measurement Frameworks (PMFs) may be influencing future values of the variable being monitored. I may be...

• Replies: 0
• Views: 1,202
01-26-2012, 05:44 PM
20. ### Help Needed! SOS! Survey Scale Development and Analysis Implication

Hey everyone! I found this forum while looking for answers to my issues and thought I would open my issues up to fellow members and see if anyone has...

• Replies: 0
• Views: 1,350
01-27-2012, 12:58 AM
21. ### question about null hypothesis??

here is my question: in my minor thesis, based on my theoretical framework, i have a hypothesis that stated that: "the score of group A is the same...

• Replies: 7
• Views: 2,975
01-27-2012, 04:37 AM
22. ### 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: 4,882
01-27-2012, 05:01 AM
23. ### 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) – e/(1 +...

• Replies: 1
• Views: 2,679
BGM
01-27-2012, 11:54 AM
24. ### Name of this test?

Hello, what is one-way MANOVA with repeated measures called, if the single independent variable has only two levels (e.g. treatment and no...

• Replies: 1
• Views: 1,345
01-30-2012, 05:55 AM
25. ### Survey Analysis

Hey Guy's I really need your help. I am not a statistician. I have to analyze surveys that have 6 observations (people) and 20 factors (food...

• Replies: 8
• Views: 2,252
01-30-2012, 12:20 PM
26. ### 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: 2,580
01-30-2012, 03:21 PM

I need to compare crude oil commodity with other commodities like gold, copper and silver based on factors like inflation hedge, risk, return,...

• Replies: 0
• Views: 1,626
01-30-2012, 09:36 PM
28. ### 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: 2,540
01-31-2012, 03:33 AM
29. ### 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: 10,215
01-31-2012, 07:02 AM
30. ### mann whitney

Hi all, a quick question from a newbie. I am doing a mann whitney test on differences in education regarding a likert scale item on a questionnaire...

• Replies: 0
• Views: 1,801
01-31-2012, 08:19 AM
31. ### Three-way mixed ANOVA - Post-hoc-analysis (Scheffé-test?)

Hello everybody, I hope someone is able to help me here, because I'm desperate and can't find help anywhere :-(. English is not my first...

• Replies: 0
• Views: 49,335
01-31-2012, 01:11 PM

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: 2,955
01-31-2012, 01:18 PM
33. ### Help with statistical test.

Hello all: I'm new to the forum and new to statistics. I'm a student doing a research on User Acceptance of Technology using a model known as...

• Replies: 0
• Views: 1,924
01-31-2012, 06:52 PM
34. ### Survey Sampling help needed guys

Hi, I hope someone can give me some advice. I need to carry out a random sampling face to face survey in an area of 2014 properties to establish...

• Replies: 0
• Views: 1,287
02-02-2012, 02:57 PM
35. ### Hey Guys I'm new and I need help

So basically, I have a very little knowledge about using SPSS, but I'm willing to learn. The problem is I'm having hard time on how to organize the...

• Replies: 19
• Views: 7,160
02-03-2012, 01:00 PM
36. ### 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: 2,867
02-04-2012, 12:46 AM
37. ### Analysis of Variance.

Hi all, I have a one question about the analysis of variance. If I have to variables (e.g. A &B) and I want to deal with them as covariate to...

• Replies: 1
• Views: 1,845
02-04-2012, 04:42 PM
38. ### Calculating Sample Size for a prospective/longitudinal study

I am an undergraduate conducting a literature review. I am wanting to discuss sample size among the papers I am critiquing. The papers I am...

• Replies: 0
• Views: 3,341
02-05-2012, 06:02 AM
39. ### Can I perform logistical regression on a sample of 28

Hi there, Would be really grateful of some advice. I have a sample size of 28; 7 of which have a disease of interest. Is it possible to perform...

• Replies: 1
• Views: 1,466
02-07-2012, 11:48 AM
40. ### 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: 3,869
02-08-2012, 12:45 AM
41. ### Using an Independent t-test with Pre/Post data

Hi to all who kindly read this. I've carried out an experiment involving a control and treatment group, and taken pre- and post- data from each...

• Replies: 6
• Views: 4,537
02-08-2012, 08:10 AM
42. ### 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: 2,288
02-08-2012, 11:48 AM
43. ### 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: 3,255
02-08-2012, 03:05 PM
44. ### Mortality Statistics help

My prof gave me a hospital mortality data to analysis but i can not think of any things else apart from crude mortality rate. Data set contains the...

• Replies: 9
• Views: 2,193
02-10-2012, 06:23 AM
45. ### basic question about variance of categorical data

So I have some data regarding items people have selected, and the people are separated into groups. I'm interested in whether or not one group has...

• Replies: 1
• Views: 2,162
02-10-2012, 06:33 PM
46. ### Experimental design survey and rank data analysis

I want to conduct a survey in which i will give to participants in two treatments a rank order(basically they will have to rearrannge items in...

• Replies: 0
• Views: 1,603
02-11-2012, 03:25 AM
47. ### Help with analysis

Hi All, I am new to the forum. I have a specific question regarding one of the behavioral experiment we are conducting. This experiment is...

• Replies: 0
• Views: 1,420
02-12-2012, 11:30 AM
48. ### Considerations for choosing the right model

Hello, I was wondering how one chooses the right model for a classification problem. Let's say I have a binary outcome variable, and many...

• Replies: 1
• Views: 2,666
02-13-2012, 09:42 AM
49. ### Power calculation in Critiquing Tool

Hi all I am currently trying to critique some orthopaedic research papers using the Downs and Black (1998) critiquing tool, but I am completely...

• Replies: 1
• Views: 3,712
02-13-2012, 02:20 PM
50. ### Traffic Survey

Hey guys, I am a third year civil engineering student, who has somehow managed to avoid doing statistics all the way through life. That is up until...

• Replies: 0
• Views: 1,070
02-13-2012, 05:00 PM
51. ### correlation coefficient

Need quick help... A researcher investigated the relationship of age and ankle strength. She found the correlation coefficient to be -.85. What...

• Replies: 5
• Views: 3,148
02-14-2012, 01:15 AM
52. ### 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: 1,944
02-14-2012, 02:30 PM
53. ### Subseting a large dataset for analysis

Hello all! Here's my situation: I have a data set that contains about 2.5 million observations, consisting of 13 variables in each row. Each row...

• Replies: 4
• Views: 2,274
02-15-2012, 08:54 PM
54. ### Indirect Effect Report

Hi All, I’m going to use the Soble macro (Preacher and Hayes, 2004, 2008) to test the indirect effect for my research variables. However, am...

• Replies: 4
• Views: 3,969
02-16-2012, 02:15 PM
55. ### Uncertainty for a star being between two values

I have a set a of stars, each of which have a magnitude in the K band ( K ) and a 1 sigma uncertainty ( dK ) associated with it. For a program I'm...

• Replies: 0
• Views: 1,287
02-17-2012, 05:07 AM
56. ### Thesis ANOVA help!

So I'm looking at the differences between those with and without autism on a task measuring social cognition (I'm thinking of averaging percentage...

• Replies: 1
• Views: 1,689
02-18-2012, 07:32 AM
57. ### 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: 1,983
02-18-2012, 11:52 AM
58. ### Controlling for familywise error for large correlations matrix

Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise...

• Replies: 0
• Views: 1,784
02-19-2012, 05:21 PM
59. ### Repeated Group Measurements, but Unpaired in that I can't Follow an Individual

I run an assay on the same two groups, a treatment group and a control group, everyday. I then want to run a statistical test to see if the two...

• Replies: 1
• Views: 1,216
02-19-2012, 05:38 PM

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.