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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: 18,787
10-11-2014, 12:02 PM
1. ### What method to use for my research

Hello all, thank you for taking the time to read this! I have the following statistics problem. I am have a small number of documents from...

• Replies: 0
• Views: 537
04-17-2013, 03:50 AM
2. ### Which test to use for my data? Thanks

Hi all, I have unequeal sample sizes so I am a little lost as to which test to use for my data. I have a total of 113 patients with one group being...

• Replies: 6
• Views: 1,481
04-16-2013, 07:27 AM
3. ### Pooling and a posteriori

Sorry if I am posting this in the wrong forum, administrators feel free to move my thread! I am having some difficulties understanding when to use...

• Replies: 1
• Views: 967
04-16-2013, 07:16 AM
4. ### Research statistical analyses

I have created my dissertation project ' The effect of eye gaze on the recognition of emotional expression in children with autistic spectrum...

• Replies: 0
• Views: 941
04-16-2013, 04:37 AM
5. ### Sphericity- why does it really matter?

Can someone help me understand how a sphericity violation is a problem in repeated measures ANOVA a little better? I assume a sphericity violation...

• Replies: 9
• Views: 1,883
04-16-2013, 01:40 AM
6. ### Fisher's Scoring Iterations ?

Hi, what does Fisher's Scoring Iteration mean?? Fisher's exact calculation gives a score of 4 but what does this number mean exactly?? Thanks, S

• Replies: 0
• Views: 4,363
04-15-2013, 03:15 PM
7. ### Solving a partial correlation matrix

One of the problems on my homework assignment is a partial correlation coefficient. I am in the dark on this one as I had drill the last class we...

• Replies: 0
• Views: 1,218
04-14-2013, 10:04 PM
8. ### Help with samples-t test problem

Hello everyone, I having difficulty with a particular problem on my homework assignment. The problem is a difference between groups t test...

• Replies: 1
• Views: 2,364
04-14-2013, 08:19 PM
9. ### ¿Weighted moments references?

Hi, I have a sample of frequencies and Sums(totals): Ni Si 23 12345 10 7800 ... Si is the sum over some variable X, measured...

• Replies: 0
• Views: 20,536
04-14-2013, 06:56 AM
10. ### How to calculate test reliability with different exam versions

Hello All, I'm new to this forum and this is my first questions. We have 1500 students and each student will receive a test that has 30...

• Replies: 0
• Views: 1,319
04-12-2013, 04:16 PM
11. ### A question about General Linear Model and random factors

Hi everyone. :wave: I have the following problem. In an experiment I had a number of plants of two developmental stages. I applied a treatment with...

• Replies: 0
• Views: 1,811
04-12-2013, 03:37 PM
12. ### Regression

Hi All, I have a quick question about the correlation before conducting regression. If there was no correlation between x and y, is there any...

• Replies: 8
• Views: 1,448
04-12-2013, 03:12 PM
13. ### proper sample size and number of estimation for comparing two predictors' AUCs

Hello, I am trying to do classification of patients by using different predictors. I want to do bootstrapping for a number of times so that I can...

• Replies: 1
• Views: 1,309
04-12-2013, 01:31 PM
14. ### Which statistical analysis technique to use in my research

Hi Everyone, My research contains the following 1. Multiple independent input variables. 2. One dependent variable. 3. All the variables are...

• Replies: 0
• Views: 1,048
04-12-2013, 09:00 AM
15. ### examples from discrete data where an underlying continuous distribution is present...

Hello. I am not sure if people here are familiar with the Pearson (as in Karl Pearson) Yule debate concerning whether some types of discrete data are...

• Replies: 0
• Views: 1,181
04-11-2013, 11:25 PM
16. ### help with pilot study

My IVS: I manipulated race of a job candidate (black or white) as well as the job candidate’s SES (Low SES or High SES) I then gave a survey...

• Replies: 2
• Views: 1,369
04-10-2013, 10:20 PM
17. ### Ordinal data analysis and hypothesis testing

Hello, I have been working on a survey analysis and have to test hypothesis if the specified kind of software resulted in increased performance of...

• Replies: 3
• Views: 3,384
04-10-2013, 10:56 AM
18. ### 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: 1,157
04-10-2013, 06:25 AM
19. ### 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: 1,573
04-10-2013, 02:37 AM
20. ### Which statistical test to use for the following scenario?

Firstly, thanks for taking the time to read my post. The scenario: I have 20 novice darts players- split into 5 teams. They're told it's a darts...

• Replies: 3
• Views: 2,301
04-10-2013, 12:33 AM
21. ### 2 Sample T Test for Nonnormal data

Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

• Replies: 10
• Views: 2,716
04-09-2013, 07:13 PM
22. ### 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: 2,238
04-08-2013, 06:43 PM
23. ### Cluster analysis - using statistiXL package for excel - how to determine a cluster

Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

• Replies: 2
• Views: 2,136
04-08-2013, 06:33 PM
24. ### Categorical covariate in ancova??

I have 1 continuous IV, one categorical IV and one continuous DV. Normally you'd investigate the effect of the categorical IV on the DV, corrected...

• Replies: 1
• Views: 4,270
04-08-2013, 06:03 PM
25. ### Data Transformations

I'm working with 15 variables or so in a dataset (n=5,000ish) and one of the variables has a strong negative skew to it (skew = -.947, std. error =...

• Replies: 3
• Views: 2,065
04-08-2013, 05:53 PM
26. ### Discrete time series analysis

Hello everybody, Well, as student I'm working this last year on my bachelor proof. The subject I'd chosen is discrete (integer) valued time...

• Replies: 0
• Views: 1,686
04-08-2013, 02:01 PM
27. ### Help with research

I will start by saying statistics is not my strong point so any help is greatly appreciated. I would like advice on methods to analyze the data I...

• Replies: 1
• Views: 1,079
04-07-2013, 04:22 PM
28. ### Is it possible to Reduce/Correct Bias through EM algorithm?

I am dealing with few overdispersed count models and using mixed Poisson distributions to deal with overdispsered data. I've used MLE technique to...

• Replies: 0
• Views: 1,187
04-05-2013, 09:00 AM
29. ### Multiple Imputation in SPSS

This might be a silly question but I thought I'd ask it just to be safe. I put a survey online that I got responses to so I am dealing with...

• Replies: 0
• Views: 1,734
04-04-2013, 12:16 PM
30. ### Application of statistics for sample of a population (Urban Renewal)?

I am bachelors student working on a report regarding Urban renewal. I am given a certain area to study. Study area include the socioeconomic aspects...

• Replies: 1
• Views: 935
04-04-2013, 05:04 AM
31. ### Average Replicates before Conducting an ANOVA?

If there are multiple replicates of a trial condition, should they be averaged before conducting an ANOVA? For example, I am looking to measure...

• Replies: 3
• Views: 2,201
04-03-2013, 12:49 PM
32. ### Mediation Analysis

Hi All, Could any one explain for me what is the exact differences between full Mediation and partial Mediation? With some example please. Many...

• Replies: 2
• Views: 1,436
04-03-2013, 11:38 AM
33. ### i want to give a high number to bater research

hi i have 2 research that i want to take Tham to in my calculation i want to make give each research a factor the 2 research explore 5...

• Replies: 1
• Views: 1,186
04-02-2013, 04:57 PM
34. ### Statistical method(s) for repeated measures....

Hi all, I'm doing a project where I want to see the effect of diet. The tricky part here is that same people have been answering a questionnaire...

• Replies: 4
• Views: 1,861
04-01-2013, 02:26 PM
35. ### 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: 1,506
04-01-2013, 02:19 PM
36. ### Multiple comparisons and multiple time points

Hi all, I wanted to ask a questions that I would assume I should know by now... I have done an experiment where I am evaluating the effect of...

• Replies: 4
• Views: 2,158
04-01-2013, 02:10 PM
37. ### Using a 'Z score' in a correlation.

Hi all, I'm conducting a bi-variate correlation, using pearsons. Can i use a z score as one variable with the other variable being dichotomous? ...

• Replies: 9
• Views: 4,188
04-01-2013, 01:59 PM
38. ### setting parameters in G*power for correlation tests

Hello, everyone :) Need your help on how to set parameters in G*power... I am doing two very simple tests: one on pearson correlation between...

• Replies: 0
• Views: 2,779
03-29-2013, 01:28 PM
39. ### Normality in repeated measures

In two groups of four – an experimental group and a control group. Over a six week period, all students were assessed three times. I have to find the...

• Replies: 0
• Views: 1,188
03-29-2013, 08:48 AM
40. ### PhD study

Dear individuals of intelligence, I would like to know if anyone can help choose the correct statistical test to carry out on my data that I have...

• Replies: 1
• Views: 1,098
03-29-2013, 05:10 AM
41. ### Online-estimate of squared correlation coefficient for linear optimization

Summary: Is there a way to directly estimate the squared correlation between two zero-mean Gaussian variables on-line and without storing more than...

• Replies: 0
• Views: 1,818
03-28-2013, 03:36 PM
42. ### Multivariate Normality accepted at 5% significance level but rejected at 1% ??

Hi, I am new to this forum. I am trying to test whether a set of variables in the data follow multivariate normal distribution. I found Mardia's...

• Replies: 1
• Views: 2,872
03-27-2013, 02:30 PM
43. ### Compute a new variable or is there a better way to do this?

First post, thanks in advance for advice. I would like to examine three variables, with the expectation that: When a subject scores HIGH on...

• Replies: 2
• Views: 1,622
03-26-2013, 04:07 PM
44. ### Mann Whitney vs. two tailed t-test

I am new to statistics and am in need of some help. I am running a study where I am providing two groups with surveys to test for their perceptions...

• Replies: 0
• Views: 3,139
03-22-2013, 10:33 PM
45. ### 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: 3,542
03-21-2013, 04:01 PM
46. ### Cox Proportional Hazard method survival analysis

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

• Replies: 1
• Views: 2,516
03-20-2013, 02:22 PM
47. ### 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: 3,703
03-19-2013, 02:54 PM
48. ### discriminant linear analysis, coefficient interpretation

Hi everyone, I am trying to weigh the effect of two independent variables (age, gender) on a response variable (pass or fail in a Math's test)....

• Replies: 2
• Views: 19,399
03-19-2013, 02:47 PM
49. ### Which test to use please?

Hello, I am relatively new to Stats and am have troubles deciding which test to use. I am testing the risky shift phenomenon. Participants were...

• Replies: 2
• Views: 2,921
03-19-2013, 12:48 PM
50. ### 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: 3,425
03-19-2013, 09:54 AM
51. ### How to analyse scale data?

Hi all, For my dissertation I have done a likret scale questionnaire, 1-5 (1=strongly disagree, 2=mostly disagree....) about body image (10...

• Replies: 0
• Views: 1,427
03-19-2013, 09:16 AM
52. ### Analysis of electricity consumsion

Hello @all I want to analyze on how several factors have an effect on electricity consumtion (measured in mw). Before I start to gather the data,...

• Replies: 0
• Views: 1,062
03-19-2013, 03:01 AM
53. ### Uniform minimum variance unbiased estimator

Hello, I need help with the develpment of this exercise that I'm trying to solve. Let \widehat{\sigma} be the U.M.V.Uestimate of \sigma when \mu...

• Replies: 0
• Views: 2,792
03-18-2013, 12:21 AM
54. ### basic hypothesis testing

am new to the forum, and would appreciate some help. i'm studying the relationship between worker performance (x) and pay (y) i'm trying to...

• Replies: 2
• Views: 1,455
03-17-2013, 01:49 PM
55. ### Between-Group and Within-Group PCA

Hi all, I'm running a PCA with two species (one fossil and one extant) divided into multiple geographic groups. The program I'm using is called...

• Replies: 0
• Views: 2,415
03-16-2013, 08:28 PM
56. ### Help Hierarchial Cluster Analysis & Categorical data

:confused: Hi, I am trying to cluster my variables which are all the letters of the alphabet by the observations of many participants in a...

• Replies: 0
• Views: 2,437
03-16-2013, 06:21 PM
57. ### Help with Dissertation Survey Data Input in SPSS

Hi all, I was looking for some help with inputting the data from my survey's into SPSS for analysis. I've conducted a survey on Internet Banking...

• Replies: 0
• Views: 1,314
03-16-2013, 08:06 AM
58. ### 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: 1,096
ttv
03-16-2013, 06:05 AM

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