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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: 18,747
10-11-2014, 12:02 PM
1. ### cross-tabs or non-parametric independent sample t-test

I have conducted a survey to determine if there is a significant difference in the number farmers and non-farmers which agree to a specific farming...

• Replies: 7
• Views: 1,919
08-17-2015, 01:32 PM
2. ### T-test question

Hi there. I have one Q need some advice on it. In my research, I have 2 national groups (British and Saudi) and I need to compare between them in...

• Replies: 7
• Views: 1,885
11-28-2012, 11:44 PM
3. ### Justification for Levene's test?

Take an example where the variance of two samples is truly heterogeneous: Sample 1 weights - 100, 140, 160, 200 Sample 2 weights - 10, 14, 16, 20 ...

• Replies: 7
• Views: 3,058
11-28-2012, 06:27 AM
4. ### Negative Pearson r ? Absolute value?

Help! I'm computing a Pearson Product-Moment Correlation and I get a negative r-value of -0.75. When I test for significance using a t-test, my...

• Replies: 7
• Views: 2,622
12-01-2012, 07:46 PM
5. ### ANOVA and quadratic terms?

Hello everyone! I have what I think is a relatively straight-forward 3-way factorial ANOVA design. One of my factors (which is "number of...

• Replies: 7
• Views: 4,802
01-21-2013, 11:33 PM
6. ### Interpretation of correlation coefficient

Hello, I am working on a meta-analysis with the program R. Here I am investigating the relationship between the dependent variable "participation...

• Replies: 7
• Views: 1,486
01-24-2013, 01:29 PM
7. ### comparison for 2 independent groups , t test or ANOVA

What test should i use for a comparison between two independent groups of N=30. Also if a questionnaire is made with only 2 answers like yes or no...

• Replies: 7
• Views: 2,521
06-15-2013, 07:47 AM
8. ### Significant lack of fit, invalid model?

I am using JMP and working with percent arrival of insects (scale of 0-1). For example, out of 10 insects, 10 arrived at date X so 0.1 is that...

• Replies: 7
• Views: 4,390
05-30-2013, 03:20 PM
9. ### Best method to analyze mediation and moderation with ordinal data?

Hello! I'm new here (and to statistics as well). I could use your advice about how to analyze the data for my master thesis. The first part of...

• Replies: 7
• Views: 6,352
05-24-2013, 11:26 AM
10. ### Analysis Likert Data and Comparing 2 Groups

I have 2 groups of people. There are 75 people in each group. Each group was given the same set of 7 Likert items. I want to compare the results...

• Replies: 7
• Views: 2,552
06-22-2013, 06:04 AM
11. ### t-test or Mann-Whitney test

I am comparing two samples of IPO (Initial public offerings) companies using t-test and Wilcoxon Mann Whitney Test. But since I am comparing 102 IPO...

• Replies: 7
• Views: 2,367
08-26-2013, 04:39 PM
12. ### Rotation in Principal Components Analysis

Hi, I was wondering if anybody could give me some general advice on a specific issue. Is it possible to orthogonally (varimax) rotate when...

• Replies: 7
• Views: 5,463
01-14-2014, 08:18 AM
13. ### 3 Groups of Participants & Likert data

Hi, I'm new to the forum - though I have browsed and found the resources helpful for a long time. Thank you to all who contribute here. I have...

• Replies: 7
• Views: 1,947
11-05-2013, 07:00 AM
14. ### Is non-parametric test necessary for independent Likert-type items?

Hi everyone I am having a difficulty in extending my survey analysis containing Likert-type item/questionnaires. I'll try my best to give a detailed...

• Replies: 7
• Views: 2,333
10-10-2013, 08:04 AM
15. ### statistical Analaysis? NEED HELP... URGENT!!!

I am working using secondary data that was originally collected for another purpose. The data is from a teen pregnancy program among Latino youth....

• Replies: 7
• Views: 1,813
11-16-2013, 06:06 AM
16. ### Before/after surgery comparison

Hi! I am currently doing experiments on song birds looking at pre- and post surgery data. I have 10 male birds each singing at least 100 songs both...

• Replies: 7
• Views: 1,443
02-04-2014, 09:20 AM
17. ### Low or high correlation?

What does it mean when Pearson correlation gives a value of 0.7-0.8, while spearman correlation gives a value from 0.3-0.4? Pearson reports high...

• Replies: 7
• Views: 4,688
03-13-2014, 09:16 AM
18. ### within subjects factors

I have two within subjects factors. One variable is fatigue (baseline, fatigue, rest). The other variable is the amplitude of swallowing muscle...

• Replies: 7
• Views: 1,445
04-04-2014, 09:56 PM
19. ### Research about stock comovements due to similar ticker symbols

Dear all, I have a small question about a small research that I wanted to do regarding stock symbol similarities and their abnormal returns. I...

• Replies: 7
• Views: 1,797
04-26-2014, 07:31 PM
20. ### Are these dependent samples?

Hello everyone, I have a dataset with 6,000 respondents. A regression analysis will be run on it. Then, I will break down the dataset into three...

• Replies: 7
• Views: 1,729
06-05-2014, 06:46 AM
21. ### Meta-analysis: different information about relationships between two variables

Hello everyone I need help with my meta-analysis. I have collected all the studies that I wish to include and would like to take Pearson's...

• Replies: 7
• Views: 930
07-30-2014, 08:37 AM
22. ### Which method to use? ANOVA, one way regression, or else?

Hi guys, For my research I have an independent variable 'education', which varies from 1 (low) to 6 (high) and a dependent dummy variable which is...

• Replies: 7
• Views: 1,808
08-03-2014, 02:52 AM
23. ### dealing with unequal sample sizes... can anyone help please?

Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

• Replies: 7
• Views: 2,520
11-18-2014, 04:14 AM
24. ### correcting for early user bias

Okay, forgive me if this is in the wrong place. Feel free to move it if it isn't. And please forgive me as I know VERY little about statistics and my...

• Replies: 7
• Views: 2,274
07-20-2015, 08:24 PM
25. ### Kolmogorov-Smirnov vs. Kuiper test

Hello, I would like to compare two 2D distributions with quantitative variables, illustrated here: For each "x", they are several measures...

• Replies: 7
• Views: 1,877
08-06-2015, 07:48 AM
26. ### comparing models

This might be a "101" question but hey, The Ecologist" encouraged me to ask questions , lots and lots of stupid questions. So when I have two...

• Replies: 7
• Views: 2,350
12-04-2015, 10:26 PM
27. ### Theory of p value matching????

I am required to write about this for my lit review. I asked the stats lecturer but he said he never heard of it! could anyone hazard a guess to...

• Replies: 7
• Views: 1,612
11-13-2015, 02:25 PM
28. ### Multiple testing?

Hi all, I have a question about some analyses that I did. I examined a large hospital admissions data set and the data were grouped by areas 1, 2,...

• Replies: 7
• Views: 1,676
12-18-2015, 10:54 AM
29. ### Should I be using a MANOVA?

Hi all, I apologise in advance if I explain this poorly - this is all somewhat new to me. I'm currently doing a small piece of classroom research...

• Replies: 7
• Views: 1,224
12-29-2015, 06:40 AM
30. ### How does one develop statistical models to compensate for weakness in public data?

Hi everyone. I have an interview coming up and the role is data centric. I have a strong knowledge of data and management, however I have never...

• Replies: 7
• Views: 1,112
08-24-2016, 11:08 AM
31. ### Name That Model!

Keywords: OLS, WLS, GLM, GzLM, Heteroscedasticity , Assumptions, Residuals, Errors Hullo I have been working full time and studying part time...

• Replies: 7
• Views: 1,845
08-05-2016, 04:22 PM
32. ### Poisson Distribution

Hi, I am using the Poission distribution to calculate probabillity for x = X. Poisson distribution is skewed to the right when lambda is small....

• Replies: 7
• Views: 2,205
02-20-2017, 05:07 AM
33. ### Correlation length

Hi all, I'm working on a hydrological model. I supposed to build a mesh with correlation length in the permeability field. I know what is the...

• Replies: 7
• Views: 2,980
02-08-2017, 10:34 AM
34. ### 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: 3,642
06-27-2008, 05:47 AM
35. ### Composite Scores - Approaches to Missing Data

I have some data from an assessment form that has 25 items, all on a 5-point scale. What I'm looking at is the sum of these items. For a few...

• Replies: 6
• Views: 6,614
12-12-2008, 09:43 AM
36. ### Discriminant analysis with mostly incomplete cases

Hello. I have a bit of a biostats problem. I’ve got data on 5 groups and 15 species. There are 9 variables, and 1000 cases total. The problem,...

• Replies: 6
• Views: 2,920
03-02-2009, 12:52 AM
37. ### gender differences

Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

• Replies: 6
• Views: 5,032
05-09-2009, 07:40 PM
38. ### Random no, mle,method of moments

Hi. 1. I generate a random sample x=(x1,…,xn) of size n from dist A with parameters (a1,a2) in R. 2. I have a likelihood function which involves...

• Replies: 6
• Views: 3,346
03-24-2010, 06:06 AM
39. ### Extreme events...

Hi. Is {w:P(w) is very small} acceptable to translate the meaning of extreme events given in the following sentence: An extreme event is defined as...

• Replies: 6
• Views: 4,630
07-14-2010, 07:47 PM
40. ### Census & tests for significance?

I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

• Replies: 6
• Views: 6,116
11-12-2010, 02:09 PM
41. ### Application of Significance Testing

SAMPLE SIZE: 518 in each city QUESTION: Likeness to have Coke after dinner. Positive Response to the Question: 320 in each city ...

• Replies: 6
• Views: 5,722
12-08-2010, 12:54 AM
42. ### determening normality in repeated measures ANOVA

Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

• Replies: 6
• Views: 19,561
07-19-2011, 05:11 AM
43. ### What statistical test should I use to check to ratio?

I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

• Replies: 6
• Views: 14,928
02-16-2011, 01:37 PM
44. ### Contingency tables with an expected value of 0

Hi all. I would like to compare two contingency tables (expected and observed). Unfortunately, one of my expectancy cells is 0, which rules out a...

• Replies: 6
• Views: 7,034
03-21-2011, 01:34 AM
45. ### Bayesian inference, MAP and sampling (Gibbs)

Hi all I'm applying bayes inference to a GMM, based on some data set. I'm using Gibbs sampling to get the "samples" from the posteriors (the mean's...

• Replies: 6
• Views: 4,946
04-17-2011, 09:30 PM
46. ### chi-square with small sample size

I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

• Replies: 6
• Views: 8,979
05-20-2011, 12:24 PM
47. ### continuous random variable

why the continuous random variable has to be given a Limit /Range? Cant we solve this random variable without a limit ? What is Continuous...

• Replies: 6
• Views: 2,945
06-06-2011, 03:43 PM
48. ### 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: 3,490
09-02-2011, 06:46 PM
49. ### Help Me ........

I am looking for a topic for my Mphil research. I am fed up with searching for a topic. i am interested in computational statistics, multivariate...

• Replies: 6
• Views: 2,004
10-27-2011, 03:57 PM
50. ### excel to SAS

library work 'c:\documents and settings\desktop\s' data s.sas; infile 'C:\Documents and Settings\Desktop\sas.prn' firstobs=2; input subject salary...

• Replies: 6
• Views: 4,360
11-07-2011, 04:08 PM
51. ### 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: 7,489
11-30-2011, 12:38 PM
52. ### 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: 2,088
12-09-2011, 02:31 PM
53. ### 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: 2,580
12-29-2011, 01:09 PM
54. ### 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
55. ### 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: 7,846
01-22-2012, 08:49 PM

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