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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: 18,740
10-11-2014, 12:02 PM
1. ### T-test help with determining whether its 1 or 2 tailed?

Hi, I need to perform a t-test to determine the relationship between US govt spending on Police and the number of Rapes annually. So I have 53...

• Replies: 10
• Views: 7,152
02-28-2012, 02:31 PM
2. ### Data transformation and kruskal-wallis

Hi! It's the first time I'm posting in your forum! I'm using statistics in a university project about operations research, and I'm having some...

• Replies: 2
• Views: 2,228
02-28-2012, 12:00 PM
3. ### Alpha reliability

Theoretically, is it ok to carry out a t-test to see the difference between two Cronbach alpha reliability scores? Thanks

• Replies: 0
• Views: 1,385
02-28-2012, 11:58 AM
4. ### Determining Significance Based on Prelimiary Data

I have conducted a test where I measured the same subjects (n =9, 2 groups) over a period of 8 days. To determine significance between the two groups...

• Replies: 5
• Views: 1,910
02-27-2012, 12:58 PM
5. ### Comparing pretest and posttest measures of intervention group with control

Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

• Replies: 3
• Views: 4,389
02-27-2012, 12:05 PM
6. ### Chi square contingency table error!

From what I understand of chi square the rows and columns must be data that are categorical. My first question is whether Increase and decrease...

• Replies: 2
• Views: 1,666
02-26-2012, 08:52 AM
7. ### Reporting non-statistically significant t-test

If we assess that with alpha=.05 and beta=.8 we can evaluate the statistical power to detect effect sizes based on the sample. 783 participants are...

• Replies: 10
• Views: 11,743
02-24-2012, 03:33 PM
8. ### TOST- two one sided t-test

Does anyone know how to compute these by hand or in minitab? Its an equivalence test, Thanks

• Replies: 0
• Views: 4,404
02-24-2012, 10:51 AM
9. ### LISREL Problem with SEM's

Could someone please help me whether it is possible to calculate a path diagram in LISREL that is designed as follows: Independent variables:...

• Replies: 0
• Views: 2,788
02-23-2012, 06:20 AM
10. ### Partial Correlation with several control variables

Dear board, I'm currently conducting a study and due to my hypothesis, there are several variables that may have an influence on one DV. Since my...

• Replies: 0
• Views: 1,754
02-21-2012, 07:30 PM
11. ### 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: 3,563
szm
02-21-2012, 06:20 PM
12. ### Im struggling -What post-hoc analysis tests?

Hi Guys I’m new here and really hope you can help me out! I’m having a struggle with some research data and have done the first part of some...

• Replies: 6
• Views: 5,123
02-20-2012, 12:30 PM
13. ### How to model time intervals

I have a dataset that I am trying to analyze that contains price information for a market index. I suspect that the behavior of the price for this...

• Replies: 0
• Views: 1,473
02-20-2012, 10:07 AM
14. ### Repeated Group Measurements, but Unpaired in that I can't Follow an Individual

I run an assay on the same two groups, a treatment group and a control group, everyday. I then want to run a statistical test to see if the two...

• Replies: 1
• Views: 1,222
02-19-2012, 05:38 PM
15. ### Controlling for familywise error for large correlations matrix

Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise...

• Replies: 0
• Views: 1,788
02-19-2012, 05:21 PM
16. ### Mahalanobis Distance

Hello, I have a question about working with Mahalanobis distance (MD). The materials I have on the matter say to enter the IVs for the analyses you...

• Replies: 2
• Views: 1,999
02-18-2012, 11:52 AM
17. ### Thesis ANOVA help!

So I'm looking at the differences between those with and without autism on a task measuring social cognition (I'm thinking of averaging percentage...

• Replies: 1
• Views: 1,694
02-18-2012, 07:32 AM
18. ### Uncertainty for a star being between two values

I have a set a of stars, each of which have a magnitude in the K band ( K ) and a 1 sigma uncertainty ( dK ) associated with it. For a program I'm...

• Replies: 0
• Views: 1,300
02-17-2012, 05:07 AM
19. ### Indirect Effect Report

Hi All, I’m going to use the Soble macro (Preacher and Hayes, 2004, 2008) to test the indirect effect for my research variables. However, am...

• Replies: 4
• Views: 3,994
02-16-2012, 02:15 PM
20. ### Subseting a large dataset for analysis

Hello all! Here's my situation: I have a data set that contains about 2.5 million observations, consisting of 13 variables in each row. Each row...

• Replies: 4
• Views: 2,327
02-15-2012, 08:54 PM
21. ### Choice of analysis method and variable skew

Hello, I'm a new poster here, so I apologise if this is not the right place. My problem is as follows: I am conducting research into fatigue and...

• Replies: 2
• Views: 1,993
02-14-2012, 02:30 PM
22. ### 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: 3,189
02-14-2012, 01:15 AM
23. ### Traffic Survey

Hey guys, I am a third year civil engineering student, who has somehow managed to avoid doing statistics all the way through life. That is up until...

• Replies: 0
• Views: 1,086
02-13-2012, 05:00 PM
24. ### Power calculation in Critiquing Tool

Hi all I am currently trying to critique some orthopaedic research papers using the Downs and Black (1998) critiquing tool, but I am completely...

• Replies: 1
• Views: 3,743
02-13-2012, 02:20 PM
25. ### Considerations for choosing the right model

Hello, I was wondering how one chooses the right model for a classification problem. Let's say I have a binary outcome variable, and many...

• Replies: 1
• Views: 2,740
02-13-2012, 09:42 AM
26. ### Help with analysis

Hi All, I am new to the forum. I have a specific question regarding one of the behavioral experiment we are conducting. This experiment is...

• Replies: 0
• Views: 1,457
02-12-2012, 11:30 AM
27. ### Experimental design survey and rank data analysis

I want to conduct a survey in which i will give to participants in two treatments a rank order(basically they will have to rearrannge items in...

• Replies: 0
• Views: 1,612
02-11-2012, 03:25 AM
28. ### basic question about variance of categorical data

So I have some data regarding items people have selected, and the people are separated into groups. I'm interested in whether or not one group has...

• Replies: 1
• Views: 2,207
02-10-2012, 06:33 PM
29. ### Mortality Statistics help

My prof gave me a hospital mortality data to analysis but i can not think of any things else apart from crude mortality rate. Data set contains the...

• Replies: 9
• Views: 2,209
02-10-2012, 06:23 AM
30. ### Comparing activity budgets, before and after

Hi all, I am a beginner, so I hope my question is not too stupid. I want to compare activity budgets of animals before and after an event. I...

• Replies: 3
• Views: 3,289
02-08-2012, 03:05 PM
31. ### Confidence interval and P-value

Hello Guy’s thanks for your help in advance I am working on a research paper. I have large set of data (50,000) which allow me to use normal...

• Replies: 3
• Views: 2,337
02-08-2012, 11:48 AM
32. ### Using an Independent t-test with Pre/Post data

Hi to all who kindly read this. I've carried out an experiment involving a control and treatment group, and taken pre- and post- data from each...

• Replies: 6
• Views: 4,568
02-08-2012, 08:10 AM
33. ### Comparing the mean of top and bottom quartiles

Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

• Replies: 2
• Views: 3,917
02-08-2012, 12:45 AM
34. ### Can I perform logistical regression on a sample of 28

Hi there, Would be really grateful of some advice. I have a sample size of 28; 7 of which have a disease of interest. Is it possible to perform...

• Replies: 1
• Views: 1,494
02-07-2012, 11:48 AM
35. ### Calculating Sample Size for a prospective/longitudinal study

I am an undergraduate conducting a literature review. I am wanting to discuss sample size among the papers I am critiquing. The papers I am...

• Replies: 0
• Views: 3,364
02-05-2012, 06:02 AM
36. ### Analysis of Variance.

Hi all, I have a one question about the analysis of variance. If I have to variables (e.g. A &B) and I want to deal with them as covariate to...

• Replies: 1
• Views: 1,858
02-04-2012, 04:42 PM
37. ### Help with interpreting chi-squared

Hello everyone, I am new here, so I hope I'm posting my question in the right section! I'm having trouble interpreting the results of an old...

• Replies: 2
• Views: 2,911
02-04-2012, 12:46 AM
38. ### Hey Guys I'm new and I need help

So basically, I have a very little knowledge about using SPSS, but I'm willing to learn. The problem is I'm having hard time on how to organize the...

• Replies: 19
• Views: 7,229
02-03-2012, 01:00 PM
39. ### Survey Sampling help needed guys

Hi, I hope someone can give me some advice. I need to carry out a random sampling face to face survey in an area of 2014 properties to establish...

• Replies: 0
• Views: 1,291
02-02-2012, 02:57 PM
40. ### Help with statistical test.

Hello all: I'm new to the forum and new to statistics. I'm a student doing a research on User Acceptance of Technology using a model known as...

• Replies: 0
• Views: 1,943
01-31-2012, 06:52 PM

I have sort of a weird question. I am reading a journal article and basically the authors used a Kruskal-Wallis test to compare the median values of...

• Replies: 2
• Views: 2,977
01-31-2012, 01:18 PM
42. ### Three-way mixed ANOVA - Post-hoc-analysis (Scheffé-test?)

Hello everybody, I hope someone is able to help me here, because I'm desperate and can't find help anywhere :-(. English is not my first...

• Replies: 0
• Views: 49,414
01-31-2012, 01:11 PM
43. ### mann whitney

Hi all, a quick question from a newbie. I am doing a mann whitney test on differences in education regarding a likert scale item on a questionnaire...

• Replies: 0
• Views: 1,832
01-31-2012, 08:19 AM
44. ### Sample size calculations for randomized controlled clinical trial

Looking for a proper sample size formula for a randomized, double-blind, placebo-controlled clinical trial. There will be three arms for the trial (2...

• Replies: 2
• Views: 10,272
01-31-2012, 07:02 AM
45. ### Wilcoxon rank sum test on Cross Validation Results

Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

• Replies: 2
• Views: 2,577
01-31-2012, 03:33 AM

I need to compare crude oil commodity with other commodities like gold, copper and silver based on factors like inflation hedge, risk, return,...

• Replies: 0
• Views: 1,642
01-30-2012, 09:36 PM
47. ### Statistical testing with very small sample

Hi all, I have a problem which wasn't covered by any of my econometrics classes. I am going to run an economic experiment. Unfortunately, I just...

• Replies: 3
• Views: 2,610
01-30-2012, 03:21 PM
48. ### Survey Analysis

Hey Guy's I really need your help. I am not a statistician. I have to analyze surveys that have 6 observations (people) and 20 factors (food...

• Replies: 8
• Views: 2,271
01-30-2012, 12:20 PM
49. ### Name of this test?

Hello, what is one-way MANOVA with repeated measures called, if the single independent variable has only two levels (e.g. treatment and no...

• Replies: 1
• Views: 1,353
01-30-2012, 05:55 AM
50. ### 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) – e/(1 +...

• Replies: 1
• Views: 2,689
BGM
01-27-2012, 11:54 AM
51. ### In dire need of help!

I took Stats 1 3.5 years ago and somehow the college forgot to mention i needed stats 2 to graduate and am now in it. I AM SO LOST and I have a...

• Replies: 3
• Views: 4,924
01-27-2012, 05:01 AM
52. ### question about null hypothesis??

here is my question: in my minor thesis, based on my theoretical framework, i have a hypothesis that stated that: "the score of group A is the same...

• Replies: 7
• Views: 2,999
01-27-2012, 04:37 AM
53. ### Help Needed! SOS! Survey Scale Development and Analysis Implication

Hey everyone! I found this forum while looking for answers to my issues and thought I would open my issues up to fellow members and see if anyone has...

• Replies: 0
• Views: 1,365
01-27-2012, 12:58 AM
54. ### Time series analysis to test a system:This seems too simple. Have I missed something?

I wish to test whether or not Performance Measurement Frameworks (PMFs) may be influencing future values of the variable being monitored. I may be...

• Replies: 0
• Views: 1,219
01-26-2012, 05:44 PM
55. ### Help to compute expected value of matrix product

Hello, I have this problem to solve which is driving me crazy: I have the following matrices g = ' where .* here means Hadamard product and...

• Replies: 0
• Views: 3,331
01-25-2012, 05:56 AM
56. ### Help need on 'Panel Corrected Standard Errors' in SAS

I have panel regression to estimate with time fixed effects and correcting standard errors using 'Panel Corrected Standard Errors', where PCSE...

• Replies: 0
• Views: 3,170
01-24-2012, 02:25 PM
57. ### Variables for INDEX - can I include variables with differents units of measurement?

Hi All, please help with this question. I want to create an index to measure natural resources. Could you kindly advise whether I can include...

• Replies: 2
• Views: 1,778
01-24-2012, 12:31 PM
58. ### Sample Size Help

I am looking for some help. I am a marketer so I know just enough about stats to be dangerous, but I have an real life problem. I am mailing...

• Replies: 4
• Views: 1,856
01-24-2012, 12:24 PM

Hi All, I am about to be dismissed from my program because I can't get my stats right on my concept paper. I hired a statistician to help me, but...

• Replies: 0
• Views: 514
01-23-2012, 09:36 PM
60. ### 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: 3,671
01-23-2012, 09:06 PM

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