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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: 18,645
10-11-2014, 12:02 PM
1. ### Correcting alpha for multiple anovas

Hi! I have 7 different properties, all independent, that are being mesured. Each property has a control and three disease groups. All independent....

• Replies: 1
• Views: 1,469
03-02-2017, 01:38 PM
2. ### 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: 2,260
07-20-2015, 08:24 PM
3. ### correction for multiple comparisons to zero (one t-test) data is notmally distributed

Hello, I am a PhD research student in the area of vision science. I am struggling to find a way to show that difference in eye position are...

• Replies: 1
• Views: 1,489
04-01-2013, 02:19 PM
4. ### Correction for multiple testing or not?

Hi all. I hope you can help me out! I have performed two microarray analyses: 1. Effect of knockdown of gene A on global gene expression levels...

• Replies: 0
• Views: 978
05-29-2015, 04:15 AM
5. ### Correction for multiple testing when tests are dependent

Dear all, I have a following problem: given N variables, I calculate N(N-1)/2 correlation coefficients, each against each (this is commonly used...

• Replies: 3
• Views: 7,691
04-08-2011, 02:24 PM
6. ### Correlating behaviors in time

This is definitely off topic but still linked. I saw some of what you do TheEcologist. I asked a question on here about correlating behaviors in...

• Replies: 4
• Views: 2,869
11-04-2011, 12:27 PM
7. ### Correlation

I have a list of vehicle models and a number of costs associated with them. For example: Mazda 1000.50 euro Peugeot 2000.23 euro Mazda...

• Replies: 12
• Views: 2,853
12-04-2008, 09:32 AM
8. ### Correlation

Hi! I'm currently working on a research..but I'm having problems with correlation. I want to correlate a test with 5 general scales to a test with...

• Replies: 2
• Views: 2,107
03-02-2012, 11:52 AM
9. ### Correlation and Regression

Hi all, I have a question about the significant p value in both correlation and regression. Is there any difference between the p values in both...

• Replies: 4
• Views: 1,535
04-10-2013, 02:37 AM
10. ### Correlation and significance with dependent observations

Hi, I am trying to correlate two variables of which one variable has dependent observations as it is data derived from a social network. I am...

• Replies: 0
• Views: 1,082
ttv
03-16-2013, 06:05 AM
11. ### Correlation between non-independent variables

Hi, I want to conduct correlation between two variables, that have common term (difference scores). Originally there are three variables X, Y,...

• Replies: 6
• Views: 2,873
09-24-2014, 11:15 AM
12. ### Correlation between two dependent variables on repeated measures

Hello there! I am trying to see if there is covariation of two variables (anxiety and sleeping heart rate) over multiple days of testing the same...

• Replies: 2
• Views: 10,112
05-02-2012, 06:13 AM
13. ### Correlation Between Unpaired Data?

What type of statistics compares or finds correlation of unpaired data? I'm assuming an XY scatter plot wouldn't work. I'm also assuming a t-test or...

• Replies: 4
• Views: 4,676
08-27-2013, 12:15 PM
14. ### Correlation coeff vs. Logistic Regression Coeff.

From a bunch of data points which look like: 1 1 1 1 1 1 1 1 1 1 0 1 1 0 1 1 0 0 1 0 1 1 0 0

• Replies: 1
• Views: 1,454
02-01-2013, 11:33 AM
15. ### correlation coefficient

Need quick help... A researcher investigated the relationship of age and ankle strength. She found the correlation coefficient to be -.85. What...

• Replies: 5
• Views: 3,148
02-14-2012, 01:15 AM
16. ### Correlation coefficient for zero inflated count data

Hi, I would like to ask what is the proper correlation coefficient to use for count data and for zero inflated count data. would Kendall tau do...

• Replies: 0
• Views: 1,944
08-05-2014, 08:22 AM
17. ### Correlation coefficient in two groups separately and the collapsed across groups

Hi, I'm having trouble interpreting the results of a test of bivariate correlation. I am computing Pearson's r in a group of 400 as a whole,...

• Replies: 2
• Views: 2,116
03-03-2012, 12:26 PM
18. ### Correlation coefficient repeated measures

Hi Everyone, I would like to measure the correlation between two quantitative variables. These variables measure the same thing but are obtained...

• Replies: 5
• Views: 2,925
03-26-2014, 04:17 AM
19. ### correlation for likert scale and respondent profile

good day. so we are having problems what method to use to find the relationship between our respondents' profile and our leading variables. our...

• Replies: 0
• Views: 1,703
09-21-2012, 03:14 AM
20. ### Correlation in contentency tables using determinants??????

"This paper suggests a measure of association (or correlation) between nominal data. It relies on the use of determinants. The general idea is that...

• Replies: 0
• Views: 1,678
05-05-2011, 09:06 AM
21. ### Correlation interpretation: when to use "is related"?

If the selling of ice cream was found correlated (0.4-0.6) to the temperature, can we conclude that ice cream selling "is related" to the...

• Replies: 0
• Views: 914
03-19-2014, 10:03 AM
22. ### 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: 2,936
02-08-2017, 10:34 AM
23. ### Correlation matrix Not positive definite in PCA

Hi, I am currently working on a project which returns a not positive matrix while conducting a PCA. As a result I don't get the sphericity test...

• Replies: 0
• Views: 1,392
11-01-2013, 08:27 AM
24. ### correlation matrix: Bonferroni or not Bonferroni is my question

Hello all, When constructing correlation matrices, a number of people claim that one should apply the Bonferroni adjustment if the number of...

• Replies: 4
• Views: 1,407
12-03-2015, 08:50 PM
25. ### correlation method for latent variable

Hi! I have several dichtomous variable which are latent and normally distributed. When I calculate correlation with two of these variables I ought...

• Replies: 0
• Views: 813
02-05-2014, 03:10 AM
26. ### Correlation of Distances

I am trying to measure geometrical similarities of given two time-course data. Each of two time course data measures independently something changing...

• Replies: 0
• Views: 1,470
07-02-2012, 06:36 AM
27. ### Correlation of two dependent variables

Hi all! I have a small data set which contains two tissue samples from ~20 patients. Each patient has contributed a tissue sample from left and...

• Replies: 0
• Views: 2,190
05-09-2014, 01:26 AM
28. ### Correlation or Difference?

hello everybody, i have a question about which method would be more appropriate. I have a 4 point ordinal dependent variable. I also have 3...

• Replies: 2
• Views: 5,579
02-26-2011, 11:41 AM
29. ### Correlation Over Time

Hello, I have data regarding the number of blood cells, and the number of a certain protein associated with blood cells, from 15 blood samples at...

• Replies: 1
• Views: 3,242
08-09-2011, 01:57 PM
30. ### Correlation Proof

Hi guys, wondering if you could help me with a proof that I am trying to figure out. Here it is... Corr (A, B) = 0 and Corr (B, C) = 0. This...

• Replies: 7
• Views: 6,594
10-07-2010, 03:34 PM
31. ### Correlation significance critical values

I've been trying to determine the critical value for a sample size of 168 but all the tables only indicate values up to 100 (most of them). Is there...

• Replies: 1
• Views: 1,312
01-15-2015, 08:41 AM
32. ### Correlation testing of survey results

Hi there, hopefully this is posted in the right section. If not, I apologise. I have been helping out a local charity to compile and analyse a...

• Replies: 0
• Views: 940
12-22-2013, 03:05 PM
33. ### Correlation versus Regression

Hi, I am trying to find an impact of some factors on overall satisfaction. Could you please advice me whether correlation or regression is better?...

• Replies: 1
• Views: 2,438
10-09-2009, 07:34 AM
34. ### Correlation vs ANOVA

Hi, I am trying to figure out which type of statistics to use for my research project. My knowledge of stats is limited so hopefully this makes...

• Replies: 6
• Views: 12,608
01-23-2013, 04:18 PM
35. ### correlation with missing data

I got a problem with correlating 2 signals x1,x2 (isgnal in time) with missing data. the missing data is periodic and is in both signals. my...

• Replies: 0
• Views: 1,425
08-17-2014, 05:46 AM
36. ### Correlation/Regression using Aggregrated Data

Hi, This is something that I've been wondering about for some time now, but which I've never managed to find a formal reference for....

• Replies: 0
• Views: 3,181
10-30-2008, 07:44 AM
37. ### 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: 3,570
12-29-2011, 07:51 PM
38. ### Correlations - Homogeneity of Variance

Hi, Please help, I'm in the middle of a research project,under pressure, and I just can't think straight. I'm using SPSS. I have data which is...

• Replies: 0
• Views: 1,713
03-21-2014, 07:49 AM
39. ### Correlations among responses to a forced-choice scale

I have data from participants who rate emotional content of pictures. Specifically, people see 20 pictures of abstract paintings (one at a time) and...

• Replies: 3
• Views: 2,148
04-08-2013, 06:43 PM
40. ### Correlations between groups of Likert-type answers – choice of statistical test

I'm looking for the optimal way to interpret some data, so any constructive advice will be appreciated. A questionnaire with 3 groups of 50...

• Replies: 1
• Views: 41,268
05-31-2012, 05:02 PM
41. ### Correlations between twins - who is X and wo is Y?

I have some data on twins (all fraternal) and I'm trying to see if there is any correlation between them on several measures (e.g., body...

• Replies: 7
• Views: 2,636
05-24-2012, 04:33 PM
42. ### Could anyone recommend an interactive application for mass data analysis?

Hi, everybody I need to conduct a large amount of data analysis on database. Could anyone recommend an interactive application for data analysis?...

• Replies: 13
• Views: 3,100
05-31-2012, 09:25 PM
43. ### Counter-intuitive results with Bold-Brunell panel data estimator (DV-INDEX)

Hi All, I am doing Brunell-Bond panel data analysis and the results seem completely counter-intuitive. The DV is a food prices index - and so if...

• Replies: 7
• Views: 1,948
04-09-2012, 03:23 PM
44. ### Covariance structure in a longitudinal study

Hi We are conducting a pharmacological trial with repeated measurements of the drug concentration in the blood over several weeks. Due to the...

• Replies: 0
• Views: 2,026
MBJ
01-10-2014, 05:30 AM
45. ### Covariate Estimation & Unbiased Estimation

I work with a group that utilizes the Mahalanobis Distance to detect the health of a system, mostly electronics. Within this research, we are looking...

• Replies: 0
• Views: 3,936
09-10-2008, 12:41 PM
46. ### Cox Proportional Hazard method survival analysis

Cox Proportional Hazard method survival analysis is the same as Cox regression analysis?

• Replies: 1
• Views: 2,472
03-20-2013, 02:22 PM
47. ### Cramer's V

Hi all, Just have a question about Cramer's V. I'm doing some analysis on education levels of partners; male partners vs. female partners. In the...

• Replies: 2
• Views: 1,520
05-21-2015, 09:05 PM
48. ### Cramer's V effect size based on df

I saw a presentation about chi-square testing and correlations. Specifically calculating effect size for Cramer's V results. The puzzling thing was...

• Replies: 10
• Views: 26,637
10-15-2011, 12:41 PM
49. ### cramers v and level of significance interpretation

Hey guys :) I have been searching for hours in books, forums and on the internet but I can't find answers to my questions, so you are my last...

• Replies: 1
• Views: 5,472
08-25-2013, 01:12 AM
50. ### Create scale (or index) using items that are measured on with different scales

Hello, I would like to make a scale of several items that are theoretically related, have a >.8 cronbach's alpha, but were measured on different...

• Replies: 0
• Views: 1,255
08-26-2012, 07:16 PM
51. ### create similar selection groups out of 4 cohorts - is it possible?

I am currently doing a study where I need to select a number of 50 members from 4 cohorts of 100 members each. 400 members have been placed in 4...

• Replies: 0
• Views: 1,123
04-10-2013, 06:25 AM
52. ### creating a variable

MY hypothesis is the following: The demographic variable of age has a significant impact on the relationship between organizational trust and the...

• Replies: 1
• Views: 1,505
03-09-2013, 02:48 PM
53. ### Criterion Validity

Hi all, I am comparing scores from two tests (new test vs gold standard). The new test is scored as 1=initial; -2=elementary low;...

• Replies: 1
• Views: 2,313
08-19-2012, 05:44 PM
54. ### Critical value for lare number of treatments

I am trying to perform a Post-ANOVA Tukey test to determine the differences between treatments. I have over 50 treatments (k>50) for some of my...

• Replies: 0
• Views: 1,080
05-10-2013, 06:37 AM

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