1. Announcement:
Want access to a chatbox?
Dason ‎(Devorador de queso)
05-10-2017
Views:
1,959
+ Post New Thread
Page 11 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 ... Last
Threads 601 to 660 of 3195

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: 18,790
10-11-2014, 12:02 PM
1. Probability of Events in Equations

Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

• Replies: 3
• Views: 3,733
12-12-2016, 09:48 AM
2. One sample t-test: help needed

Hi all! I really hope someone will help me out! I want to compare the difference between a single manager's perceptions and customers' perception...

• Replies: 8
• Views: 3,731
11-22-2010, 08:42 AM
3. Tests for nonnested models (Vuong, Clarke)

When comparing generalized linear models, do the Vuong and Clarke tests require that the response distributions be the same? For example, could I...

• Replies: 0
• Views: 3,731
03-12-2011, 01:41 PM
4. Little's MCAR test: mismatch in DF

Hi, I have a question concerning degree of freedom in little ’s MCAR test. There seems to be a mismatch in the degree of freedom in the results of...

• Replies: 0
• Views: 3,731
06-23-2013, 10:01 AM
5. GLS in MATLAB

Hi, Can anybody help me to solve a simultaneous equation model with Generalised least square in MATLAB?

• Replies: 0
• Views: 3,719
11-15-2012, 03:12 AM
6. MLE for correlation (not covariance) matrix?

Is there an efficient way to estimate the correlation matrix for the D-dimensional r.v. \mathcal X = (\mathcal X_1, \ldots, \mathcal X_D) under the...

• Replies: 4
• Views: 3,714
02-08-2013, 11:33 AM
7. Advice on predictive modelling/forecasting

Hi - I am looking for some advice on predictive forecasting. I will be taking measurements of power grid frequency data. These will all be within...

• Replies: 1
• Views: 3,713
01-24-2011, 07:51 AM
8. Canonical Discriminant analysis.

Hi everyone :) I am new here. May be my query is too easy for you people but I have no idea how to do that. :confused: :( .Please help me. So my...

• Replies: 3
• Views: 3,708
03-19-2013, 02:54 PM
9. which statistical test to use - Observed difference in outcome is due to chance?

Hi, I have results from two very sensitive but different lab test trying to find pathogen in a patient sample. For some patients, results from two...

• Replies: 12
• Views: 3,706
11-06-2016, 08:07 PM
10. Tricky(?) sampling problem

Hello all! I have a survey data set consisting of interview answers of different people. The people have been sampled with simple random sampling....

• Replies: 3
• Views: 3,690
09-27-2009, 02:33 PM
11. 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: 3,689
01-23-2012, 09:06 PM
12. comparison of Exponential distribution and Lognormal Distribution parameters

Hi everyone! I have 30 days worth of data. Each day, I have a set of interarrival times. I wanted to find out the distribution of the arrivals, so...

• Replies: 0
• Views: 3,687
05-29-2012, 07:07 AM
13. I.I.D assumption of T-test

I am writing my second master's thesis now and I came across a situation where V\neq{V}. So I thought I'd test whether this need to be the case in...

• Replies: 10
• Views: 3,685
01-16-2014, 02:29 PM
14. Comparing means from SAME sample

I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

• Replies: 0
• Views: 3,684
09-01-2010, 01:35 PM
15. Cronbach's alpha

Help please! What data do I need to work out the cronbach alpha coefficient? I have 30 responses to a large number of Likert-type questions. We want...

• Replies: 5
• Views: 3,684
10-14-2011, 05:01 AM
16. Which statistical test shall I use please? Thanks a lot

Hi I am trying to compare 2 groups- one that has had surgery on the same leg (37) vs opposite leg (48) and to compare whether there is any...

• Replies: 3
• Views: 3,681
12-29-2016, 08:42 AM
17. which correlation for a PCA?

I have data that has both discreet and continuous variables and, that are highly variable, not entirely independent of each other and some aren't...

• Replies: 0
• Views: 3,677
05-08-2009, 05:11 AM
18. Power calculation with measurement error on Y

I'm trying to do a power calculation for a study I'm involved in, and I'm a bit stuck. The study is about textual cues of trust. We want to...

• Replies: 12
• Views: 3,676
11-01-2016, 07:02 PM
19. Checking if Critical Point Max or Min or Saddle

How can I check if a critical point (x1,x2,...x10) for a function of 10 variables is a minimum or maximum or saddle? There is a lot of...

• Replies: 0
• Views: 3,672
02-04-2011, 05:42 PM
20. 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: 3,672
03-30-2012, 09:56 AM
21. A Soccer/Football Ratings System - Home Advantage

Hi guys, this is my first post. (So do lower your expectations) I'm currently writing a thesis that deal with sports probabilities and part of the...

• Replies: 2
• Views: 3,671
09-02-2015, 03:42 AM
22. How to find out the specific association of a particular age bracket to a particular

If I have a table (mXn) that contains the rows of age brackets (like 25-35 years, 35-45 years, 46-60 years) and three columns of low stress, medium...

• Replies: 7
• Views: 3,665
04-10-2010, 10:15 AM
23. Sample size...

have found numerous on-line calculators and have read through some forum postings but am now more confused than ever. I have been asked to...

• Replies: 1
• Views: 3,654
05-20-2009, 09:13 AM
24. The gumball analogy - research advice please.

zzzzzzzzzzzzzzzzz

• Replies: 1
• Views: 3,654
10-29-2011, 12:19 AM
25. power analysis for parameter estimation of a gamma distribution?

How do I calculate the needed sample size to determine if the parameter estimates are accurate enough for a gamma distribution? Thanks.

• Replies: 10
• Views: 3,653
08-04-2011, 05:30 PM
26. Modeling traffic according to a distribution.

Hello everybody! I'm new in this forum and I hope this is the right place to post this thread.. I'd like to kindly ask you just a suggestion to...

• Replies: 6
• Views: 3,652
06-27-2008, 05:47 AM
27. paired or unpaired T-Test or even some other test?

Hello there, I am trying to help out some students of medicine who are writing at their phd-thesis in germany. they have data from several...

• Replies: 7
• Views: 3,651
09-14-2011, 07:18 PM
28. number of distinct samples in sampling with replacement

If I have a set (X1, X2,X3) and I want to re-sample them with replacement, the possible combinations of the samples are (the order doesn't matter):...

• Replies: 0
• Views: 3,650
02-01-2011, 06:58 PM
29. non-parametric equivalent for mixed-factorial design

I have to analyze my confidence data which is measured using a likert scale (1 – 7). Because it’s ordinal in nature, I need to use non-parametric...

• Replies: 2
• Views: 3,648
04-27-2011, 11:13 PM
30. Logistic regresion with only discrete IV

Hi, I saw a few binary logistic regressions in Minitab where we did not have any continuous variables and the analysis Minitab gave was simply the...

• Replies: 5
• Views: 3,647
08-03-2013, 02:29 PM
31. Testing Standard deviations for repeated measures design

Hi, I need to do a within subject test of standard deviations. I have 14 people and 4 groups of standard deviations. We want to see if there is any...

• Replies: 5
• Views: 3,645
07-21-2011, 02:16 PM
32. Multinomial Logistic Regression

Does anyone knows how I can formulate a the link function of a multinomial logistic regression without using a base class teotjunk

• Replies: 2
• Views: 3,640
05-07-2010, 05:57 PM
33. 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: 3,634
12-02-2011, 09:58 AM
34. finding data trends

I have a dataset that includes four replicates of 7 different concentrations of pesticides applied to a plant. After exposure the number of offshoots...

• Replies: 2
• Views: 3,631
11-16-2008, 03:31 AM
35. Regression on Binned data

Hi, Can I carry out linear regression reliably with binned data. IE. data on cases falling into a series of ranges over time. I can imagine...

• Replies: 0
• Views: 3,626
Cox
11-30-2009, 09:38 AM
36. Multivariate analysis - help

Hi, I'm looking at place of death in a group of people, I have information on where they died, what they died of, their ethnicity, the area of...

• Replies: 4
• Views: 3,619
05-30-2015, 05:37 AM
37. Event study t-test help

Hi, Im doing a report about clinical trials and abnormal effect returns on the stock market. I have collected 7 events with an eventwindow of -5...

• Replies: 0
• Views: 3,619
05-04-2011, 03:14 PM
38. Statistical test for two Maxwell-Boltzmann distributions

Suppose we have two processes A and B, and N subjects, x_i. A(x) is distributed as a Maxwell-Boltzmann distribution with scale parameter alpha_a;...

• Replies: 2
• Views: 3,618
04-12-2011, 01:10 PM
39. 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: 3,614
12-29-2011, 07:51 PM
40. Convergent and Divergent Validity

Is it possible to make a multimethod-multitrait matrix of tests with different number of items? example: Test 1 consists of 5 categories with 24...

• Replies: 7
• Views: 3,612
03-06-2012, 10:30 AM
41. EM algorithm

Hello can you help me? I require a program for estimate of parameters in density of mixture exponential With EM algorithm . Thank you for your...

• Replies: 0
• Views: 3,608
04-09-2006, 03:44 PM
42. Choosing an appropriate Statistical Test

Hi All, I'm new here - just wanted to ask you which statistical test I could use for the following case (thanks in advance!): Information: ...

• Replies: 3
• Views: 3,605
12-06-2010, 11:36 PM
43. Propensity score matching - pre-treatment outcome variable

Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and...

• Replies: 5
• Views: 3,602
12-05-2016, 03:20 PM
44. choosing basic test: logistic regression or multiple chi square?

-------------------------------------------------------------------------------- Hi, I'm new to statistics and am working on a project for...

• Replies: 0
• Views: 3,601
06-22-2009, 10:41 AM
45. transformation response and predictors

How to find the proper transformation of the response or predictors ? Is it simply to identify from the diagmostic plot ? Usually I apply...

• Replies: 1
• Views: 3,599
11-03-2010, 03:08 PM
46. Inter rater reliability

I'm hoping someone might be able to help me figure out how best to analyse the data I have. For my research, subjects each create 3 small image...

• Replies: 0
• Views: 3,599
11-10-2010, 11:45 AM
47. Rasch Analysis

Hello all, someone asked me to look into Rasch Analysis. I have found a few articles that I am going to read but I was just curious if anybody is...

• Replies: 4
• Views: 3,599
02-23-2016, 12:09 PM
48. What is the technique of analyzing pooled cross sectional data?

Like the title suggests, I have a data set that comprise of several cross sectional waves. The subjects in each wave are different, just to be clear....

• Replies: 0
• Views: 3,596
03-28-2011, 02:15 AM
49. 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: 3,592
01-19-2012, 02:40 PM
50. Problems for ordinary least squares and ridge solutions

I am confused with these two methods. Fox example, Suppose p ≫ n (many more predictor variables than observations), I have a design matrix X and...

• Replies: 1
• Views: 3,588
03-16-2010, 01:51 AM
51. Categorical data goodness of fit question

Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion...

• Replies: 6
• Views: 3,588
szm
02-21-2012, 06:20 PM
52. Using Mann-Whitney U?

Hi, I'm confused about which statistic to use. I want to find out if a law in two different states influences service delivery (get referral/ do...

• Replies: 10
• Views: 3,582
08-27-2012, 03:56 PM
53. Randomization in an experiment

Hi, everyone. I know randomization is basically to help guarantee that the experiment at hand doesn't systematically favor any condition over...

• Replies: 0
• Views: 3,578
01-19-2009, 12:19 AM
54. Bivariate Contour Ellipse Area

I have found a research paper, where there is need to calculate the area of a bivariate contour ellipse. I am familiar with drawing a confidence...

• Replies: 0
• Views: 3,576
07-21-2016, 07:25 AM

+ Post New Thread
Page 11 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 ... Last

Thread Display Options

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.

Order threads in...

Note: when sorting by date, 'descending order' will show the newest results first.

Icon Legend

Contains unread posts
Contains no unread posts
Hot thread with unread posts
Hot thread with no unread posts
Thread is closed
You have posted in this thread

Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts