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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: 18,750
10-11-2014, 12:02 PM
1. ### Need Help on Hypothesis testing

Need help in understanding whether the method i am adopting is correct or not and what other tests i can include. I have a sample size of 720...

• Replies: 0
• Views: 987
04-29-2012, 04:34 PM
2. ### Distribution of estimator (exponential distribution; truncated at both ends)

Good day forum, I've been struggling with for a while and would like to hear some thoughts on this one. I've got an exponential distribution,...

• Replies: 3
• Views: 1,685
11-05-2012, 01:57 PM
3. ### Bootstrap bias

Good day forum, I'm using a bootstrap approach to get a better understanding of a sampling distribution. I've heard that the bootstrap approach...

• Replies: 0
• Views: 1,153
11-05-2012, 01:49 PM
4. ### cross-validation of prognostic model (test-set method)

I am cross-validating a logistic regression model using the test-set approach, with 70% training data in the test set and 30% in the validation "set"...

• Replies: 0
• Views: 2,389
08-09-2011, 08:23 AM
5. ### Equivalent to RMSE for logistic regression?

I understand that RMSE is a useful summary measure for assessing predictive power of regression model with continuous dependent Y. Is RMSE equally...

• Replies: 1
• Views: 6,480
08-09-2011, 10:54 AM
6. ### different intercept with Multinomial vs Binomial Logistic?

I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was...

• Replies: 0
• Views: 2,691
09-06-2011, 03:02 PM
7. ### control vs exposed

so i have 2 diffferent sample wherein the 1st sample is control and the 2nd sample is exposed to technology i.e in terms of exposure to Mobile...

• Replies: 0
• Views: 1,774
03-24-2014, 02:32 AM
8. ### Machine learning techniques for biomedical prediction

Apologies for cross posting, I have a general question about why ML is not used more in translational research. I know that some/most...

• Replies: 0
• Views: 1,153
12-03-2011, 07:36 PM
9. ### Chi-square instead of Multiple Regression Analysis

Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

• Replies: 0
• Views: 869
05-21-2016, 11:45 AM
10. ### Quick Chi-Square Question

Hi all, I'm familiar with chi-square and have used it for a while at work. Just wondering something... When calculating the Chi-Square for each...

• Replies: 4
• Views: 2,264
03-18-2014, 09:23 AM
11. ### choosing basic test: logistic regression or multiple chi square?

-------------------------------------------------------------------------------- Hi, I'm new to statistics and am working on a project for...

• Replies: 0
• Views: 3,589
06-22-2009, 10:41 AM
12. ### A Soccer/Football Ratings System - Home Advantage

Hi guys, this is my first post. (So do lower your expectations) I'm currently writing a thesis that deal with sports probabilities and part of the...

• Replies: 2
• Views: 3,651
09-02-2015, 03:42 AM
13. ### Meta-analysis - Can I investigate mediation effects for the effectiveness of training

Hello everyone, I am currently working on my Master thesis on moderators and mediators for the effectiveness of cross-cultural training (CCT). I...

• Replies: 0
• Views: 1,057
03-25-2017, 11:34 AM
14. ### Statistic test for comparing time budget?

Hi all I am a beginner in statistics and I have the following difficulty. I video-recorded some animals in two populations and I calculated...

• Replies: 1
• Views: 1,507
03-02-2017, 11:20 AM
15. ### Event Clustering in an Event Study

Dear All, I conducted an Event-Study to assess price effects. Now the result show widely fluctuating abnormal returns. Since the event-date across...

• Replies: 1
• Views: 9,664
03-09-2009, 08:41 AM
16. ### how to initiate statistical research, one dependent variable, many independt

Hi guys For work, I've initiated this project. I've gathered data, now I'm gonna do the analysis. The objective is to find out where we get our...

• Replies: 0
• Views: 973
02-14-2014, 06:16 AM
17. ### 2 Cubed Experiment

Could some one give me an example of a 2 cubed experiment? I am having trouble thinking about one. I need an experiment to record 2 different...

• Replies: 0
• Views: 1,392
09-09-2012, 03:36 PM
18. ### multicollinearity help with control variable

Please can someone help me. I am looking at the effect of board ownership on stock performance and using ln market cap as the control variable....

• Replies: 0
• Views: 1,229
09-05-2012, 03:58 PM
19. ### Sample Size Calculation (HELP!)

Hi all, I wish someone could help me out. I am trying to estimate the sample size for a national health survey. From the previous report,...

• Replies: 1
• Views: 1,974
10-15-2016, 09:44 AM
20. ### Can I use a chi-square test for this 2x3 contingency table?

Imagine I want to find out whether there are any differences between male and female participants in their pet choices, and this is my 2x3...

• Replies: 1
• Views: 19,043
07-26-2012, 09:30 PM
21. ### Multidimensional Scaling - Can I split the comparisons between respondents?

Good evening, For my master thesis I am conducting research in which I want to make decompositional comparisons for Multidimensional Scaling with...

• Replies: 0
• Views: 1,656
06-05-2014, 01:51 PM
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. ### Citation needed for removing 3 Stdev outliers

Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

• Replies: 3
• Views: 2,720
07-30-2012, 04:51 PM
24. ### Calculate CI for Var of sum of normally dist variables?

Hi guys, I'm trying to figure out how to calculate a confidence interval for a variable that is the sum of normally distributed variables. ...

• Replies: 0
• Views: 901
02-02-2014, 10:39 AM
25. ### What is the purpose of inferential statistical tests when you already have parameters

Hello, I'm an undergraduate political science student, and I am working on my senior thesis. I've collected data on a small population (N = 129)....

• Replies: 2
• Views: 1,136
12-29-2015, 11:15 AM
26. ### A Simple Meta-Analysis query

Hi All, I am working on my first meta-analysis project and this may sound silly, but I am having difficulty deciding which studies to include. ...

• Replies: 0
• Views: 2,452
10-10-2008, 04:50 AM
27. ### Issue in Interpreting SPSS output of GLM repeated measures

I have a data set with repeated measures for each individual. That is there a re two groups, treatment and control. And each individual is measured...

• Replies: 0
• Views: 1,062
06-10-2015, 01:43 AM
28. ### What is the proper way to divide a skewed dataset into high, medium, and low interval

I don't know if this is the proper forum for this. Hello, I have a skewed dataset, and I am dividing it into high, medium and low values. I don't...

• Replies: 2
• Views: 6,840
01-24-2011, 11:37 AM

Hi all, I have this question and have been toiling on it for days. Am not sure if I'm tackling it correctly. A group of patients attending a...

• Replies: 5
• Views: 4,213
01-02-2012, 11:23 AM
30. ### Survey on how frequently a group use a particular device: Which analysis methods?

I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want...

• Replies: 0
• Views: 2,504
11-08-2016, 06:51 AM
31. ### What test should have been used...

Done with the assignment ... No replies :(

• Replies: 0
• Views: 1,391
10-15-2013, 08:35 PM
32. ### 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: 1,773
10-09-2013, 04:55 AM
33. ### Infinite divisibility under mixing - kernel density estimation

Hi all, Can we consider a (multi-modal) kernel density estimate as a finite mixture of probabiliy distributions which would be infinite divisible?...

• Replies: 3
• Views: 4,877
08-18-2008, 12:07 PM
34. ### Question Regarding Research Design

If I have a dataset with 100 unspecified cases and I know from a previous chart review that the likelihood is that 10% of these are indeed cases how...

• Replies: 2
• Views: 1,316
05-10-2015, 10:47 PM
35. ### Sample size of US prison population....

So, I'm doing research on economic background of people in US prisons and have to collect the data manually so I'm wondering how many I really need...

• Replies: 3
• Views: 2,654
08-12-2013, 07:56 AM
36. ### Best Approach

Hi, I am looking to analyse a data set consisting of one dependent variable - respondent satisfaction values ranging from 1 to 10 - with three...

• Replies: 2
• Views: 2,445
02-23-2011, 11:38 AM
37. ### Help assessing convergence across categorical responses

Hi folks I posted this in the SPSS section, but its actually more a question about which test to use so I think it belongs here. I'm working...

• Replies: 0
• Views: 930
03-05-2015, 11:07 AM
38. ### T scores & a Multivariate Analysis

4 tests were administered to 2 different groups. The scales of measurement for the tests were different, so the raw scores were converted to...

• Replies: 1
• Views: 3,051
05-30-2007, 12:02 AM
39. ### Test of Significance?

I want to conduct a significance test in finding the significance between either a C+ vs a B- in AP statistics class will affect chances of attending...

• Replies: 42
• Views: 7,702
06-24-2011, 06:30 PM
40. ### Excel sample size comparison

I have two independent groups that tested their own sample size (based on their group's sampling rules) of the same data for process failures. Group...

• Replies: 0
• Views: 266
09-18-2017, 12:47 PM
41. ### Wilcoxon and Anova? Confused!

HI! I'm really quite new to stats so I apologise for glaring foolishness :P Basically in the study that I'm looking at is a within-subjects...

• Replies: 0
• Views: 1,942
04-04-2014, 06:50 AM
42. ### Comparing confidence intervals: CI of mean vs CI of regression coefficient

Hi, I have longitudinal data with measurements at two timepoints. I am interested in the change per year and calculated this in two ways: *...

• Replies: 0
• Views: 1,837
06-22-2012, 08:28 AM
43. ### Help with choice of nonparametric?

Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

• Replies: 2
• Views: 2,516
11-07-2010, 02:57 AM
44. ### Help deciding which analysis to run

Hi all, I'm doing a study and having trouble deciding on the appropriate analysis. I'll give a simple example of what I'm trying to do and any help...

• Replies: 0
• Views: 959
03-23-2012, 02:50 PM
45. ### General Term for Models with Dependend and Independend Variables

Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

• Replies: 3
• Views: 2,469
01-26-2015, 06:44 AM
46. ### Types of Predictive Models

Among the predictive models there are some, 1. which deliver exactly one solution for the estimation problem (e.g. regression, GLM, ...) 2....

• Replies: 0
• Views: 1,203
01-26-2015, 08:50 AM
47. ### Literature regarding Multinomial Logit Regression

Hello, I am looking for helpful links and literature regarding the logit regression with a multinomial target variable aka multinomial GLM. ...

• Replies: 0
• Views: 900
02-12-2015, 08:06 AM
48. ### How to generate multiple correlated variables?

Hello! One can generate two c0rrelated variables as follows: x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal random variable...

• Replies: 2
• Views: 1,974
02-19-2015, 12:15 PM
49. ### How to alter the standard deviation of an empirical distribution?

For the purpose of a simulation I need to increase the standard deviation of an empirical distribution. I want to simulate what will happen if the...

• Replies: 4
• Views: 2,112
02-21-2015, 05:46 PM
50. ### Maximum Likelihood Estimator for a Transformed Uniorm Distribution

Hello, I have got a transformed uniform distribution. The distribution is of the form: v= u^w Where u: uniform distributed variable w:...

• Replies: 0
• Views: 940
02-23-2015, 06:21 AM
51. ### How to generate an autocorrelated random variable?

Hi, I know I can generate two correlated random variables x1 an x2 using x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal...

• Replies: 15
• Views: 4,962
03-11-2015, 01:08 PM
52. ### Book for Applied Panel Data Analysis

Hello, I am looking for a book with the topic applied panel data analysis. I already had a look on these ones: ANALYZING PANEL DATA (P) This...

• Replies: 0
• Views: 1,229
10-03-2013, 10:43 AM
53. ### Does the NSA random number generator backdoor affect statistical random nummbers?

Hello, in my computer magazine I read 1 month ago, that the NSA has inserted a backdoor in the random number generating circuit on Intel...

• Replies: 1
• Views: 2,107
01-17-2014, 06:29 PM
54. ### GLM on bimodal Data possible?

Hello, I've got data, in which the target variable is bimodally distributed. The target variable is also bimodally distributed conditional on the...

• Replies: 0
• Views: 2,470
04-29-2014, 03:57 PM
55. ### Nonparametric for paired, but unequal sample size

Hi, I'm in the midst of writing my master thesis, but I'm having issues with the statistics. I've measured muscle cells. In short, I've 4...

• Replies: 4
• Views: 1,183
03-14-2016, 10:29 AM
56. ### Can they called unequal sample sizes and t-test/ANOVA?

I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

• Replies: 0
• Views: 2,767
05-02-2011, 03:09 AM
57. ### SOS!Correct name of sampling method.

Dear all, please help me as I have to finish my dissertation in one week and I unfortunately cannot find the correct name for the sampling method...

• Replies: 1
• Views: 1,347
08-04-2013, 02:02 PM

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