1. Announcement:
05-10-2017
Views:
1,871
Page 18 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 ... Last
Threads 1021 to 1080 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: 18,723
10-11-2014, 12:02 PM
1. ### Help with choosing statistics

Hi! Stumbled over this forum recently, there's so much knowledge here I could just sit and read and read. Anyway, I'm not the strongest in stats so I...

• Replies: 22
• Views: 4,528
11-22-2011, 12:09 AM
2. ### Comparing Correlation's Effect Size, Significance between Two Populations

Hi, All! I have variables describing students (N=340), both boys (N=160) and girls (N=180). I calculated Pearson's correlation (using SPSS) for...

• Replies: 2
• Views: 2,264
11-22-2011, 08:13 AM
3. ### Dickey Fuller Test

I am studying the Dickey Fuller test. The book of reference is Introductory Econometrics for Finance by C. Brooks. I firstly consider the zero mean...

• Replies: 1
• Views: 3,142
11-25-2011, 01:49 AM
4. ### Homogeneity of Variance

Hi all, I want to test the Homogeneity of Variance (HV) before conducted MANOVA, and I have to groups (different nationality; Arabs and British)...

• Replies: 1
• Views: 1,955
11-26-2011, 06:46 PM
5. ### Question about cluster analysis

Hello, I am new to cluster analysis and I am trying to run some analysis based on some survey data I have. I have found a lot of information...

• Replies: 0
• Views: 1,476
11-28-2011, 06:03 AM
6. ### How to weight residents survey by demographics

Hi I am analysing a residents survey and I am trying to find the best advice around how to weight the responses. I have calculated a matrix of...

• Replies: 0
• Views: 1,791
11-28-2011, 07:39 AM
7. ### I need help in my undergraduate project

Hi all, I have conducted a questionnaire about factors affecting academic performance my sample size =300 students from different colleges...

• Replies: 9
• Views: 2,789
11-28-2011, 06:23 PM
8. ### significant interaction but variables not significant on their own

Hi I was wondering if anyone could help me. I have been looking at consumers purchase intention levels across three indepedent variables, age,...

• Replies: 6
• Views: 7,481
11-30-2011, 12:38 PM
9. ### Where to start?

I am trying to find the best way to identify the optimal quantity for packaging that reduces handling of product. example: Product 1 ...

• Replies: 2
• Views: 1,450
11-30-2011, 03:17 PM
10. ### Sum of independent beta-Bernoulli random variables

I'm looking for the distribution of the sum of independent beta-Bernoulli random variables, that is Bernoulli random variables with beta-distributed...

• Replies: 5
• Views: 6,680
11-30-2011, 04:36 PM
11. ### Help with work project

I am attempting to do a statistical breakdown of the results from a competition we do here at my job each year. The competition has relavance, so...

• Replies: 1
• Views: 1,441
11-30-2011, 05:47 PM
12. ### ANOVA Design and Analysis

Hello, This is my first post so I hope my question is appropriate for the group. I have performed an experiment where we have blood samples...

• Replies: 1
• Views: 1,411
12-02-2011, 02:33 AM
13. ### 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: 3,613
12-02-2011, 09:58 AM
14. ### 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: 26,135
12-03-2011, 03:52 PM
15. ### 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: 2,548
12-03-2011, 04:05 PM
16. ### 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: 1,149
12-03-2011, 07:36 PM
17. ### 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: 1,898
12-08-2011, 02:37 AM
18. ### 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: 1,512
12-08-2011, 08:24 AM
19. ### 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: 3,485
12-08-2011, 03:19 PM
20. ### 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: 2,086
12-09-2011, 02:31 PM
21. ### 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: 1,655
12-09-2011, 09:40 PM
22. ### 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: 1,304
12-11-2011, 05:45 PM
23. ### 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
24. ### 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: 1,825
12-13-2011, 07:51 PM
25. ### 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: 1,579
12-15-2011, 04:45 AM
26. ### 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: 1,401
12-15-2011, 12:19 PM
27. ### 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: 5,157
12-15-2011, 04:17 PM
28. ### 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: 1,719
12-16-2011, 04:28 PM
29. ### 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: 5,474
12-16-2011, 09:43 PM
30. ### 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: 1,618
12-18-2011, 08:00 PM
31. ### 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: 2,142
12-19-2011, 02:47 AM
32. ### 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: 1,492
12-22-2011, 05:27 AM
33. ### 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: 1,750
12-23-2011, 12:27 PM
34. ### 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: 12,347
12-27-2011, 02:48 PM
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: 3,082
12-29-2011, 05:40 AM
36. ### 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: 4,035
12-29-2011, 11:10 AM
37. ### 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: 2,576
12-29-2011, 01:09 PM
38. ### 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: 3,591
12-29-2011, 07:51 PM
39. ### 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: 7,002
12-29-2011, 08:05 PM
40. ### 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: 3,875
12-30-2011, 11:59 AM
41. ### 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: 2,088
12-31-2011, 02:47 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: 4,206
01-02-2012, 11:23 AM
43. ### 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: 1,553
01-02-2012, 12:16 PM
44. ### 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: 1,270
01-02-2012, 07:59 PM
45. ### 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: 1,796
01-03-2012, 02:47 PM
46. ### 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: 2,661
01-03-2012, 07:08 PM
47. ### 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: 1,441
01-04-2012, 02:20 AM
48. ### 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: 1,705
01-04-2012, 07:24 PM
49. ### 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: 3,081
01-05-2012, 10:07 AM
50. ### 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: 13,213
01-06-2012, 06:35 AM
51. ### 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: 2,025
gav
01-06-2012, 08:17 AM
52. ### 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: 3,990
01-06-2012, 07:44 PM
53. ### 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: 2,383
01-08-2012, 02:06 PM
54. ### 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: 1,238
01-08-2012, 10:30 PM
55. ### 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: 2,171
01-09-2012, 03:15 AM
56. ### 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: 1,274
01-11-2012, 09:20 AM
57. ### 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: 1,353
01-15-2012, 11:58 AM

Page 18 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 ... 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.