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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: 18,731
10-11-2014, 12:02 PM
1. ### Variance Inflation Factor

Hej, I am checking for multicollinearity. And I cant find on the web when having the outpur from R commander, on which I have to look to identify...

• Replies: 10
• Views: 5,019
10-02-2016, 06:38 PM
2. ### Statistical method to rank Likert-items

Dear Readers, Currently, I am conducting a study to investigate the need for assistance with a certain process. I used a survey including...

• Replies: 10
• Views: 1,453
05-15-2017, 09:33 AM
3. ### Bonferroni Correction Factor !!!

Hello, What exactly Bonferroni correction factor means? Why we calculate it in our study? Thanks, Bala

• Replies: 9
• Views: 25,738
07-14-2009, 06:33 AM
4. ### Longitudinal analysis and the independence assumption

This is a bit of a long one, but I would really appreciate some help with it. I have a long list of data which describes whether a violent...

• Replies: 9
• Views: 4,947
11-13-2011, 05:14 PM
5. ### Expected Value

A list of n items is arranged in random order; to find a requested item, they are searched sequentially until the desired item is found. So, how will...

• Replies: 9
• Views: 6,839
05-08-2010, 05:29 AM
6. ### Working With Population Data

Is there a way to determine if a difference is significant when using entire population data? For example if i see that the difference between test...

• Replies: 9
• Views: 7,090
09-23-2010, 05:12 AM

Hello I am conducting research into how behvaviour changes from year 1 to year 2 of study on a college course. I have provided students with a...

• Replies: 9
• Views: 5,095
08-23-2011, 07:58 PM
8. ### Research Design

Hi there, i'm wondering if you guys could guide me a bit with my plans. Basically im intrested in looking at paranoid ideation (thr presence of...

• Replies: 9
• Views: 4,009
02-15-2011, 09:15 PM
9. ### level of significance 0.1%

Hi! Would it be OK to use a level of significance of 0.1 -instead of traditional 0.05- when using non-parametric tests in bivariate analyses if...

• Replies: 9
• Views: 24,474
07-23-2013, 02:55 AM
10. ### Regression line slope for R^2 ~= 1

Sorry if my question is answered in textbooks! I was wondering what the slope would be for the regression line of a regression that has an R squared...

• Replies: 9
• Views: 12,812
03-31-2011, 07:02 AM
11. ### test whether 2 mean scores are significantly different

I have two groups of participants; 1 group received treatment A and the other group received treatment B. I have the mean scores of the effectiveness...

• Replies: 9
• Views: 9,926
06-22-2011, 03:09 PM
12. ### Power

Hi there, I need some help getting my head around this power concept. If there's a small but important effect, should you try and find it...

• Replies: 9
• Views: 2,420
08-25-2011, 08:35 PM
13. ### Sample, population on Facebook

Hello everyone, i need help verifying if my method is correct or if you can find any problems with it, and if you can i would like you to propose...

• Replies: 9
• Views: 2,950
09-16-2011, 05:36 AM
14. ### I need help in my undergraduate project

Hi all, I have conducted a questionnaire about factors affecting academic performance my sample size =300 students from different colleges...

• Replies: 9
• Views: 2,790
11-28-2011, 06:23 PM
15. ### Classification of patients based on continuous variable

Dear TS users, I have got data on a group of patients and the amount of protein they consume. I want to classify the patients as malnourished or...

• Replies: 9
• Views: 2,144
12-19-2011, 02:47 AM
16. ### One Sample T-Test

For an exercise is received speed measurements on two road points. The cars drove along an urban road (30mph) that opened into a rural road (60mph)....

• Replies: 9
• Views: 2,385
01-08-2012, 02:06 PM
17. ### Scientific Theories

When evaluating a theory, which of these criteria do you think is the most important, the least important, and why? Do all of these criteria need to...

• Replies: 9
• Views: 3,582
01-19-2012, 02:40 PM
18. ### 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: 2,208
02-10-2012, 06:23 AM
19. ### im i doing this right?

Help PLEASE!!!! I'm attempting to do a stats assignment atm and I'm hoping to get some feedback on how im doing so far. the assignment is this: ...

• Replies: 9
• Views: 2,554
03-29-2012, 01:17 PM
20. ### Where to find data (morning running vs evening running)?

Hi, I am trying to do some analysis on running time: morning vs evening. Does anyone know where I can find data? Thanks in advance. John

• Replies: 9
• Views: 2,693
05-02-2012, 05:42 PM
21. ### Why use Chi-square?

Hi, I am putting together a statistics course about inference techniques to use when the predictor variable(s) are categorical (by which I mean,...

• Replies: 9
• Views: 4,682
08-15-2012, 01:58 PM
22. ### Why use Kruskal-Wallis?

Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

• Replies: 9
• Views: 7,289
08-13-2012, 03:14 PM
23. ### 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: 1,869
04-16-2013, 01:40 AM
24. ### Partial Correlation when one variable and the control are two-level ordinal variables

I have one numerical variable and another two-level ordinal variable(e.g., one level is 27 and the other 51). I could classify it as a dichotomous or...

• Replies: 9
• Views: 10,246
02-26-2013, 05:40 PM
25. ### 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: 4,155
04-01-2013, 01:59 PM
26. ### How to estimate count data models with observations with incomplete spell periods?

Dear friends, I have a data base of 51 contracts. My research consists of estimating the determinants of recurrent contract renegotiations. Thus I...

• Replies: 9
• Views: 1,517
08-27-2013, 12:34 PM
27. ### Statistical significance of the accuracy of two distinct methods

My task to achieve is the following: I have one given dataset at hand. Furthermore, I have given a gold standard I want to compare my results to....

• Replies: 9
• Views: 2,312
10-14-2013, 08:49 AM
28. ### Stat used in Med Articles - HELP

Hi Folks, Just to let you know I didn't even know where to post the thread, so apologize if I am in the wrong section :) I am reviewing articles...

• Replies: 9
• Views: 1,770
10-09-2013, 04:55 AM
29. ### Poll: Assumptions independent variables when just want to control/adjust for - less strict?

Is it true that when one just want to control for/adjust for in linear og logistic regression models, the variables one wants to control for/adjust...

• Replies: 9
• Views: 2,355
03-08-2014, 05:48 AM
30. ### Sample size question - thanks for helping this right brainer!!

It's been a long time since I *somehow* chose a sample size of 75 from a homogenous, hard to reach population of 3,156. Why would I do this, I...

• Replies: 9
• Views: 1,641
03-05-2014, 05:17 AM
31. ### Good Book on Mathematical Statistics

I'm a mostly self-trained analyst with degrees in the social sciences but not in statistics. I'm looking to improve my knowledge of the mathematics...

• Replies: 9
• Views: 2,715
09-17-2014, 07:09 AM
32. ### Stuggling with choosing the correct test.

So I am analyzing data for a student outside of my department. They are looking to see the differences in exam scores between two different methods...

• Replies: 9
• Views: 1,920
08-27-2016, 01:11 PM
33. ### Can I use fishers exact test in this situation?

You can see in the below table that I have multiple cells that have expected counts <5 and cells with counts equal to zero + zero expected counts. As...

• Replies: 9
• Views: 1,825
05-22-2017, 08:47 PM
34. ### comparing two measurements over time

I'm designing an experiment with two condition. Cond A with no manipulation of the independent var and ConB with manipulation of the independent var....

• Replies: 8
• Views: 7,802
08-27-2007, 04:38 AM
35. ### continuous/categorical IV in anova

Hi, I understand that ANOVA assumes categorical IVs, and ANCOVA should be used if continuous IVs are included in the model. I am currently analyzing...

• Replies: 8
• Views: 14,965
05-23-2008, 08:33 AM
36. ### Tricky running mean and standard deviation problem

Hi, I have a pretty tricky problem that I can't seem to solve. The basic problem can be expressed as follows: - I have a stream of data (in my...

• Replies: 8
• Views: 10,052
01-13-2009, 06:00 PM
37. ### Help on Factor analysis and Extension

Hello frnds , Recently we had done a project on Factor analysis approach to understand the indian consumer behavior Our survey questioner...

• Replies: 8
• Views: 5,229
01-26-2009, 12:28 PM
38. ### hypothesis testing for least squares fitting

I have a spectrum that is composed of several things. I do least squares fitting in order to determine the amount of each component. For example: ...

• Replies: 8
• Views: 6,897
03-02-2009, 10:30 AM
39. ### Stats for whole population data

Hi all - I'm an employee of a government department who has been asked to answer some question to do with a whole population data set. In short, here...

• Replies: 8
• Views: 6,981
01-04-2010, 11:13 AM
40. ### multiple groups & dichotomous responses

I have a set of data from a number of countries where interviewees have answered simple yes/no questions. The "DV" is, in other words, 1 or 0, and...

• Replies: 8
• Views: 5,327
07-16-2010, 10:29 AM
41. ### Summary variable for adversities

Fellow members, I'm doing research currently on the effects of childhood adversities on development of the autonomic nervous system. I'm a little...

• Replies: 8
• Views: 5,794
10-07-2010, 12:30 AM
42. ### what am i supposed to do?

Let X_1,X_2,........,X_n ~ N(\mu,\sigma^2), both \mu and \sigma^2 unknown. Find the value of b which minimizes the MSE of the estimator...

• Replies: 8
• Views: 3,049
11-02-2010, 11:22 AM
43. ### One sample t-test: help needed

Hi all! I really hope someone will help me out! I want to compare the difference between a single manager's perceptions and customers' perception...

• Replies: 8
• Views: 3,721
11-22-2010, 08:42 AM
44. ### population normally distributed, sample not, parametric test allowesd?

Hi guys, Imagine I know that my variable of interest (say blood glucose) is normally distributed in the population. But I have a small sample and...

• Replies: 8
• Views: 18,204
02-19-2011, 07:26 PM
45. ### Choosing Statistical Tests for a Study

I am designing a study and I am trying to figure out what statistical tests I will need to run. I haven't taken stats in a few years, and my...

• Replies: 8
• Views: 5,266
03-28-2011, 11:41 PM
46. ### Correct method for determining group membership

Hi, I am doing some research into what determines whether or not people gain an educational qualification in later life. My thought was to run...

• Replies: 8
• Views: 5,306
07-29-2011, 07:03 AM
47. ### Mean change over time attriubted to another variable

The following is the research question that was posed to me: How much of impact on the increase in satisfaction over last year can be attributed...

• Replies: 8
• Views: 5,058
09-28-2011, 04:34 PM
48. ### Mean centering (good bad or ugly?)

As part of a regression course I have to do mean centering. I looked it up and have read 4-5 articles on it. Generally opinions are skewed in the...

• Replies: 8
• Views: 15,964
10-16-2011, 12:45 PM
49. ### 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: 3,488
12-08-2011, 03:19 PM
50. ### Directional or Non-directional Hypothesis for Independant t-test?

I am doing a comparative study on the level of depression , anxiety and stress perceived between adolescents (male and females). My sample Size is 60...

• Replies: 8
• Views: 12,359
12-27-2011, 02:48 PM
51. ### 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: 2,270
01-30-2012, 12:20 PM
52. ### Curve parameters

Hi all, I have a curve with an intercept, slope, and quadratic factor. Now, I would like a draw a curve that is one standard deviation above this...

• Replies: 8
• Views: 2,766
03-13-2012, 03:10 PM
53. ### simultaneous equations

hi guys, i need help regarding simultaneous equations. for the following simultaneous equations: R=b1+b2*Q+errorterm2...

• Replies: 8
• Views: 1,984
04-21-2012, 08:48 AM
54. ### Mentioning that data was not randomly sampled in discussion?

Hi there, I was just wondering whether the following is a good idea to mention in my discussion: Im investigating depression and maladaptive...

• Replies: 8
• Views: 1,966
08-13-2012, 12:58 PM

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