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# 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: 18,638
10-11-2014, 12:02 PM
1. ### 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: 3,523
07-21-2016, 07:25 AM
2. ### 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: 3,523
12-29-2016, 08:42 AM
3. ### Choosing prior for beta and normal random variables

Hi, I need to choose 1) a prior distribution for the mean and variance of a normal random variable. 2) a prior distribution for the shape...

• Replies: 1
• Views: 3,521
01-14-2011, 10:31 AM
4. ### non-parametric t-test with mean/SD = 0

Hi All, quick question on non-parametric t-test I have 2 groups. 7 values each. Group One= 0, 0, 0, 0, 0, 0, 0 which of course is mean=0 and...

• Replies: 5
• Views: 3,520
02-05-2013, 11:24 PM
5. ### Low population hypothesis testing

Hi, I'm doing statistics for a friend of mine. Problem with the data is that there are only 64 responses. Questionnaire was distributed to a...

• Replies: 4
• Views: 3,516
11-16-2010, 06:28 AM
6. ### 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: 3,515
szm
02-21-2012, 06:20 PM
7. ### Anova without intercept?

Is it possible to perform Anova without an intercept? In the software, there is an option to check the box that says “no intercept”. Once I do...

• Replies: 3
• Views: 3,515
10-31-2016, 03:02 PM
8. ### Possible stats tests to use?

Hi, After racking my brain not knowing what to do with my data I thought I'd give it a shot and post here, as I'm still unsure what I can do to...

• Replies: 1
• Views: 3,510
10-13-2014, 05:19 AM
9. ### Testing the inter-rater reliability when data doesn't have a normal distribution

Hello guys! What is a standard way of testing the inter-rater reliability when data doesn't have a normal distribution? I had a bunch of raters...

• Replies: 0
• Views: 3,509
12-08-2010, 10:42 PM
10. ### Within Subjects OXO and confounds

Greetings! I'm helping a friend in the medical field with his research and I have an I/O Psych background - meaning lots of regression and...

• Replies: 1
• Views: 3,496
07-19-2009, 09:33 PM
11. ### Help w/survey results!

I am hoping someone can help me figure out how to do the following: I am a member of my child's school's accountability committee, and as such we...

• Replies: 4
• Views: 3,494
04-08-2011, 04:05 PM
12. ### Introduction for Observational Study on Red Cars

This is the Introduction for my stats project on red cars vs. speeding tickets received. Let me know what changes to make, and how the intro is....

• Replies: 0
• Views: 3,493
06-13-2010, 09:01 AM
13. ### When are random variables random?

I have an environmental dataset in which a treatment was carried out on a series of plots (situated on the landscape) in duplicate. However the...

• Replies: 0
• Views: 3,487
11-26-2008, 09:34 AM
14. ### About the distribution of confidence interval for Weibull

Does anyone have an idea about the distribution of the 95&#37; confidence intervals for a population with a Weibull distribution? Thanks in advance!

• Replies: 0
• Views: 3,486
03-23-2009, 06:18 PM
15. ### Article on logistic regression - don't understand logic of statement.

The author Menard, has written a good deal on this topic and this is from a recent (2011) journal article. This makes sense. But I don't...

• Replies: 16
• Views: 3,484
06-26-2013, 11:44 AM
16. ### Intermediate outcomes: use as predictors in logistic regression, or use Naive Bayes?

I am predicting whether or not someone will receive a grant from an agency (dichotomous outcome). I have generated a model that uses various...

• Replies: 0
• Views: 3,479
12-08-2010, 03:45 PM
17. ### Need help to test the significance

I want to make a test to see if the difference is significant or not. What I have is two different groups of values (one with 31 values and the other...

• Replies: 5
• Views: 3,477
04-07-2011, 07:38 PM
18. ### test which of two models is better predictor -- but the two are correlated with each

Dear All -- Can anyone please please help me? I have a dichotomous dependent variable Y There are two alternative models for predicting Y The...

• Replies: 6
• Views: 3,476
09-02-2011, 06:46 PM
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: 3,466
12-08-2011, 03:19 PM
20. ### how to determine the sample size needed for logit model

how to determine the sample size needed for logit model? we are currently working on a thesis.

• Replies: 1
• Views: 3,447
08-03-2011, 12:12 AM
21. ### Weighting survey answers - different approaches

Hej! I've quite recently changed job moving both to another country and from private to public sector. I have both before and currently worked as...

• Replies: 1
• Views: 3,445
10-17-2010, 01:36 PM
22. ### Durbin-Watson statistics - autocorrelation

If the Durbin-Watson statistics for the OLS regression was 2.268, does it suggest that there is no autocorrelation among residuals since d is near 2?...

• Replies: 4
• Views: 3,443
03-21-2013, 04:01 PM
23. ### PLS-DA: Are latent variables comparative?

Hello, first post on the forum - hopefully this is the correct place to do this. I've been working on developing an system for visualising the...

• Replies: 2
• Views: 3,433
05-27-2012, 07:40 PM
24. ### Describing a curve in order to compare with species abundance

Hi, I was wondering if there was an established method / algorithm for describing a curve (in this case, grain-size data) in order to compare...

• Replies: 0
• Views: 3,432
04-11-2008, 05:31 AM
25. ### Multivariate Analysis assistance needed

I have conducted a survey on online privacy sensitivity. Part of the survey used a previously-proven instrument to generate a Privacy Sensitivity...

• Replies: 4
• Views: 3,432
10-14-2008, 07:42 PM
26. ### non parametric multiple comparison

Hello I am doing statistical analysis on my research data and the data is not normal. So I used Kruskal Wallis test for finding whether treatments...

• Replies: 3
• Views: 3,431
09-23-2014, 01:27 AM
27. ### Statistical Research Question

Here is what I am looking at: I want to know how 3 factors (we'll call them A1, A2, A3) correlate with Store Sales per Store (532 stores). In...

• Replies: 3
• Views: 3,428
01-22-2009, 02:09 AM
28. ### CFA using AMOS: Poor model fit for an instrument

Hi everyone, I'm conducting CFA using AMOS to evaluate the structure of an instrument. The following models are specified and evaluated: Model...

• Replies: 3
• Views: 3,423
10-25-2013, 06:10 PM
29. ### Violation?: Comparing group mean to population mean

Greetings! I was hoping you guys could help me out with a problem. Im curious to know how one would go about attacking a problem like this. I...

• Replies: 0
• Views: 3,422
11-09-2012, 08:42 AM
30. ### it is must to include include ANOVA results in specified format

Hi. My thesis has calculations that uses one-way ANOVA.There are 40 dependent variables which are needed to be compared under 14 independent...

• Replies: 0
• Views: 3,421
11-19-2016, 03:19 AM
31. ### Fisher's exact test, Hypergeometric distribution

Hi, I need some help with Fisher's exact test and the hypergeometric distribution My data consists of: 500 mutations - that I want to score as...

• Replies: 0
• Views: 3,415
04-24-2012, 08:19 AM
32. ### repeated measures t-test question - Help!

Hi, I have measured various parameters (for example heart rate) in two groups (control and treated) over a time course of 45 minutes, taking...

• Replies: 1
• Views: 3,414
05-22-2009, 10:05 AM
33. ### What statistic to use?

I am reviewing the statistics we currently use at work to ensure that we are using the correct statistics. The scenario is: a. We produce...

• Replies: 1
• Views: 3,409
04-28-2009, 01:13 AM
34. ### Statistical Independence

I'm trying to give my students a brief introduction to chi-square testing, but there's something that's a little confusing to me regarding the...

• Replies: 1
• Views: 3,408
04-27-2011, 11:02 PM
35. ### Non normal distributed Statistical Test

I am doing Statistical test between independent variable vs dependent variable Independent : Numeric Data - eg: Age (5,6,78,19) Dependent :...

• Replies: 1
• Views: 3,406
03-16-2011, 10:54 AM
36. ### Generating correlated binary data

Suppose I have a column of random binary numbers. I would like to find a way to generate a second column with the same number of cases that has a...

• Replies: 2
• Views: 3,404
03-19-2010, 06:31 PM
37. ### attributes of individuals in discrete choice tasks

Hello stat talkers, :wave: I'm currently working on a marketing (discrete choice) project concerning brand choice and I stumbled upon some questions...

• Replies: 3
• Views: 3,403
11-23-2009, 04:23 AM
38. ### What is a monte carlo simulation?

I am doing some research and think I am doing a monte carlo simulation. Could some body please tell me what that is? If someone could also tell me...

• Replies: 1
• Views: 3,402
10-22-2009, 08:53 PM
39. ### 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: 3,396
01-19-2012, 01:06 PM
40. ### Mann-Whitney U Test for non random sample

Hi I've got too groups Success and Failure I've got four sample populations in different industries that i've ranked by a measure of success. ...

• Replies: 2
• Views: 3,390
01-20-2011, 03:31 AM
41. ### Parametric t-tests for individual / portfolio stock returns

Hello everyone, I am relatively rookie with statistical tests and I am trying to perform a parametric t-test for stock returns as follows. I have...

• Replies: 2
• Views: 3,387
12-21-2016, 10:22 AM
42. ### muscle strength gain vs. time vs. age

Anyone have data from longitudinal studies on this? 1% per week seems like a reasonable initial value. Thanks.

• Replies: 0
• Views: 3,378
08-15-2010, 04:24 PM
43. ### t test using diversity index

So, I am trying to perform a t-test using diversity indexes, but the biostat book I am using is a little bit confusing. the calculated t value =...

• Replies: 0
• Views: 3,376
07-23-2010, 08:49 PM
44. ### statistical analysis- ANOVA, t test, questionnaire

Hi all, I am doing a mini research in HCI filed which examine the differences between pen touch and finger touch on specific Smartphone. I have...

• Replies: 5
• Views: 3,370
02-04-2013, 04:44 PM
45. ### Cluster analysis vs multicolinearity

Hi you all, I hope you can help me with this following problem: 1. I've runned an factor analysis on my data for fifteen "need" items for sugar...

• Replies: 0
• Views: 3,367
10-17-2011, 06:40 AM
46. ### simultanoues equations for panel data

I want to estimate a simultaneous equations model in which each structural equation has a panel data structure. how to do it? Stata doesn't have a...

• Replies: 0
• Views: 3,364
07-14-2008, 07:46 AM
47. ### Instrumental Variable?

So i have a bunch of variables: religious beliefs (how religious you are) and religious participation (how often you go to church), and demographic...

• Replies: 1
• Views: 3,364
12-17-2008, 01:24 AM
48. ### grouping categorical variables for regression

I'm working with survey data dealing with reproductive health among women with HIV. I would like to explore possible factors which may contribute to...

• Replies: 0
• Views: 3,361
11-20-2010, 10:20 AM
49. ### Volume of confidence intervals for Multinomial distributions

Hi, I'd like to know the formula for calculating the volume of the confidence (rectangular) region for the multinomial distribution. I've already...

• Replies: 0
• Views: 3,359
11-09-2010, 09:50 AM
50. ### Unweighted population vs weighted population

Hi everyone, I have a dilemma of trying to find how to best read a data. Here is a sample of my data, the question is how frequent do you buy a...

• Replies: 2
• Views: 3,359
10-10-2013, 09:56 PM
51. ### problem of finding MLE

consider a sample X_1,X_2,.....,X_n the pdf given by f(x) = \frac{1}{\mu}e^-\frac{x-\mu}{\mu} , x>\mu, \mu>0 what is the MLE of \mu? ...

• Replies: 4
• Views: 3,358
BGM
11-19-2010, 11:03 AM
52. ### Relative risk

Can anyone help me with this? I have two variables: 1) Immune suppression 2) Air space disease. Of the patients with NO immune suppression...

• Replies: 0
• Views: 3,356
01-16-2011, 01:45 PM
53. ### Difference needed for power in fixed population.

Hi, I am designing a study to examine the difference made by implementing a new treatment strategy for a medical condition. I have become a...

• Replies: 7
• Views: 3,355
03-25-2011, 12:34 PM
54. ### concordance of two sets of data

here is my problem: for a set of genes i have an expected(predicted) phenotype and an observed phenotype. i need prove that the level of...

• Replies: 0
• Views: 3,352
10-13-2008, 12:29 PM
55. ### Panel Data Fixed Effects with year dummies

I wasn't sure quite were to put this thread, so I'm posting here even though it's very similar to another one I posted in another thread. Quick...

• Replies: 0
• Views: 3,349
03-19-2013, 09:54 AM

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