1. Announcement:
05-10-2017
Views:
1,897
Page 36 of 54 First ... 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Last
Threads 2101 to 2160 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: 18,758
10-11-2014, 12:02 PM
1. ### 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: 7,852
01-22-2012, 08:49 PM
2. ### 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: 1,414
01-21-2012, 06:52 PM
3. ### 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: 2,197
01-20-2012, 03:52 PM
4. ### 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: 1,337
01-19-2012, 03:21 PM
5. ### 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: 3,588
01-19-2012, 02:40 PM
6. ### 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: 3,424
01-19-2012, 01:06 PM
7. ### 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: 1,414
01-19-2012, 10:34 AM
8. ### 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: 1,536
01-18-2012, 01:08 PM
9. ### 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: 1,875
01-17-2012, 08:46 AM
10. ### 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: 2,033
01-16-2012, 05:18 PM
11. ### 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: 2,104
gav
01-16-2012, 10:03 AM
12. ### 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: 2,309
01-16-2012, 09:01 AM
13. ### linear relation / stationarity

i need a clarification: if we have a linear relation between data, we can say that the processus is stationary ?? :wave:

• Replies: 0
• Views: 1,359
01-15-2012, 11:58 AM
14. ### Imputed data sets

I am doing a project where there are two different primary outcome variables (one smoking related and one alcohol related) that are being analysed...

• Replies: 1
• Views: 1,276
01-11-2012, 09:20 AM
15. ### Data Set of Pattern Recognition

I need help in looking for a data set for classification. The kind of data I am looking for are where measurements are available from experimental...

• Replies: 1
• Views: 2,178
01-09-2012, 03:15 AM
16. ### Approximate Bayesian Computation and joint posteriors

Hi! I am performing Approximate Bayesian Computation (ABC) in phylogenetic research. I have a few questions for which I am looking for a useful...

• Replies: 0
• Views: 1,244
01-08-2012, 10:30 PM
17. ### One Sample T-Test

For an exercise is received speed measurements on two road points. The cars drove along an urban road (30mph) that opened into a rural road (60mph)....

• Replies: 9
• Views: 2,391
01-08-2012, 02:06 PM
18. ### Help with multivariate (MCA) analysis graph interpretation

Hi All, Thanks in advance for any insight you can offer!! I’ve been tasked with analyzing possible correlation between various quantitative...

• Replies: 1
• Views: 4,002
01-06-2012, 07:44 PM
19. ### ICC and Factor scores

Dear All, I am computing Inter-class correlations (ICC) for a multilevel comparison of geographical areas. I have a long list of indicators and for...

• Replies: 0
• Views: 2,032
gav
01-06-2012, 08:17 AM
20. ### Pre/Post-Survey Methodology Question

I'm working on a project where we did a pre-survey to get a baseline assessment on health knowledge and attitudes in several states, conducted a...

• Replies: 5
• Views: 13,252
01-06-2012, 06:35 AM
21. ### 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: 3,100
01-05-2012, 10:07 AM
22. ### Writing my own package for classes

Hi, I'm looking for idea for package(about 5 functions and one base data) in R. Everything what come to my mind is closed to what I do on classes,...

• Replies: 6
• Views: 1,707
01-04-2012, 07:24 PM
23. ### Statistical projects

pls I'm looking for possible projects in statistics... hopefully on TIME SERIES or FORECASTING.... please could anyone kindly help me out. Thanks

• Replies: 0
• Views: 1,446
01-04-2012, 02:20 AM
24. ### 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: 2,665
01-03-2012, 07:08 PM
25. ### 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
26. ### Trebling the distance between 2 points in a continuous parameter space ?

I have say a sample of n p dimensional points and I want to treble the distance between each point and the mean of all the points in continuous...

• Replies: 0
• Views: 1,272
01-02-2012, 07:59 PM
27. ### 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: 1,562
01-02-2012, 12:16 PM

Hi all, I have this question and have been toiling on it for days. Am not sure if I'm tackling it correctly. A group of patients attending a...

• Replies: 5
• Views: 4,215
01-02-2012, 11:23 AM
29. ### Which test to use for this?

Hi folks, I'm conducting a little test with a friend who plays roulette online. He maintains that the 'spins' generated by online casinos are...

• Replies: 4
• Views: 2,090
12-31-2011, 02:47 PM
30. ### Minimum sample for a t-test independent samples

I have a sample which consists of 2 treatments and 15 unique samples. Data are interval. It was obtained by measuring arguments in similar pages from...

• Replies: 5
• Views: 3,891
12-30-2011, 11:59 AM
31. ### Hartigan's Dip Test for Bi-Modality: Rejecting surprising distributions

Hi, I'm new here. Thanks for providing this forum! I'm checking some separate sample distributions for bi-modality since most but not all of them...

• Replies: 1
• Views: 7,023
12-29-2011, 08:05 PM
32. ### Correlational stusy, Conformity and Intelligence

Im doing a research correlation between Confirmity and Intelligence. Got 60 sample size. All participants where given 2 tests to fill up, Approval...

• Replies: 5
• Views: 3,605
12-29-2011, 07:51 PM
33. ### longitudinal analysis help

Hi there Im struggling to figure out which statistical test i need to use on my data and then also how to carry this out in R or SPSS.... I have...

• Replies: 6
• Views: 2,581
12-29-2011, 01:09 PM
34. ### 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: 4,043
12-29-2011, 11:10 AM
35. ### Independent t test - small sample size - use all data points?

Hi there, I am running a small study in which both treatment (n = 7) and control groups (n= 6) have undertaken the same 48 item rating scale task...

• Replies: 1
• Views: 3,088
12-29-2011, 05:40 AM
36. ### Directional or Non-directional Hypothesis for Independant t-test?

I am doing a comparative study on the level of depression , anxiety and stress perceived between adolescents (male and females). My sample Size is 60...

• Replies: 8
• Views: 12,382
12-27-2011, 02:48 PM
37. ### A method to estimate linear regression coefficients when some data is missing

Is there a method to estimate linear regression coefficients when some data is missing, without deleting the records are missing? I know that This...

• Replies: 2
• Views: 1,758
12-23-2011, 12:27 PM
38. ### single-case design

hi there i am attempting to find a way to find the statistical significance of the difference between a patient's scores on a test compared with...

• Replies: 1
• Views: 1,494
12-22-2011, 05:27 AM
39. ### Classification of patients based on continuous variable

Dear TS users, I have got data on a group of patients and the amount of protein they consume. I want to classify the patients as malnourished or...

• Replies: 9
• Views: 2,150
12-19-2011, 02:47 AM
40. ### 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: 1,623
12-18-2011, 08:00 PM
41. ### alternative to anova

What is an alternative statistical test to anova. I have a large varience between three groups (control and two experimental). How can I determine...

• Replies: 10
• Views: 5,485
12-16-2011, 09:43 PM
42. ### Research question - How relevant is standard error/confidence interval in my case??

Hello I work for an organization that has sent online survey requests to all of our clients this year (560 only from 2011). The response rate has...

• Replies: 1
• Views: 1,726
12-16-2011, 04:28 PM
43. ### 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: 5,165
12-15-2011, 04:17 PM
44. ### Confronting two tests

Hi A group of people have taken a test with 3 possible answers. Then they underwent therapy. Finally, the took the same test again (with the 3...

• Replies: 2
• Views: 1,406
12-15-2011, 12:19 PM
45. ### What stats test to use?

What test to use!? I have a data set in which I want to test if there is a difference between the means of a continuous variable for three...

• Replies: 0
• Views: 1,581
12-15-2011, 04:45 AM
46. ### 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: 1,831
12-13-2011, 07:51 PM
47. ### evaluating loess fit

Hello Everyone, I am trying to evaluate the fits of data using loess() in R. I cannot seem to find any established methods for determining the...

• Replies: 1
• Views: 1,917
12-13-2011, 07:13 PM
48. ### grouing variable,likertscale firm,performance,multvariate analysis

My research is aim to investigate the mechanisms through which IT influence sustainability of competitive advantage. The data is collected through...

• Replies: 0
• Views: 1,305
12-11-2011, 05:45 PM
49. ### Multivariate Hotelling's T or univariate test?

Hi, I am new to the board and tried to search for Hotelling's T but could not find an answer to my problem (the appropriate test statistic). I'm...

• Replies: 0
• Views: 1,659
12-09-2011, 09:40 PM
50. ### Looking for One Dimensional Randomness Test ??

Hello everyone, I hope everything is going very well with all of you. I need you help finding an answer of the following question. I do have...

• Replies: 6
• Views: 2,091
12-09-2011, 02:31 PM
51. ### reliability and pilot testing...losing plot!

Hi All I have modified an exisiting survey, added more questions. I have two separate scaleswithin this measuring different constructs, the rest...

• Replies: 8
• Views: 3,495
12-08-2011, 03:19 PM
52. ### Stratification criteria mess up the use of a random factor?

Hi! In my study on kelp I want to see how wave exposure and current (both continuous variables) affect kelp physical measures along the Norwegian...

• Replies: 0
• Views: 1,516
12-08-2011, 08:24 AM
53. ### Association of demographic variables with the questionnaire,,27questions in likert sc

hi, I am doing a research study to see the qualtiy of life of patients,so i am having a questionnaire which uses likeret scale to collect response...

• Replies: 0
• Views: 1,900
12-08-2011, 02:37 AM
54. ### Machine learning techniques for biomedical prediction

Apologies for cross posting, I have a general question about why ML is not used more in translational research. I know that some/most...

• Replies: 0
• Views: 1,153
12-03-2011, 07:36 PM
55. ### Practical question about Page's L test

I have a k number of 77. Unfortunately the table I've obtained only goes to 10. :shakehead... How can I otherwise calculate the Lcrit? Thank you

• Replies: 0
• Views: 2,551
12-03-2011, 04:05 PM
56. ### Non-parametric equivalent of a factorial anova (not repeated measures)?

Hi there. Firstly apologies for the awful spelling in the main title - obviously I meant factorial Secondly hello I am new to this forum and...

• Replies: 16
• Views: 26,182
12-03-2011, 03:52 PM

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.