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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. a data modeling question

Just had a job interview with a bank. They asked me the following questions: 1. Their credit card offers reward points. They want to predict...

• Replies: 1
• Views: 1,676
03-05-2012, 04:26 AM
2. Appropriate sample size for unusual "populations"

There seems to be a lot of literature about determining sample size based on population, margin of error and confidence level. This seems difficult...

• Replies: 2
• Views: 881
08-16-2016, 08:22 PM
3. 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: 49,411
01-31-2012, 01:11 PM
4. Simple regression

Hi, I am having a problem and I know a way to solve but don't know how to statistically implement it. I'm trying to summarize the problem in a...

• Replies: 4
• Views: 2,822
12-25-2009, 09:18 PM
5. Significance in a Yes/No question

Hi, So I'm working on a research project that is looking into whether there's a statistically significant difference between pilots in their...

• Replies: 2
• Views: 5,731
06-22-2011, 02:01 PM
6. one sample t-test alternative

Hello, I hope someone can help me, because I am getting crazy with this. Imagine the following scenario: I have several participants. Each...

• Replies: 13
• Views: 2,233
04-10-2014, 07:08 AM
7. Can sensitivity be calculated in non-binary variables?

Hi everyone, Is there any analogous measure of sensitivity and specificity for non-binary variables? For example, if I want to study the...

• Replies: 2
• Views: 417
07-20-2017, 05:27 AM
8. 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: 1,288
03-16-2013, 08:06 AM
9. 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: 41,309
05-31-2012, 05:02 PM
10. 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: 2,945
03-26-2014, 04:17 AM
11. Kappa coefficient for repeated measures

Hi Everyone, I know that a kappa coefficient for repeated measures exists, but I didn't find the article in free access (Kraemer HC. Extensions of...

• Replies: 0
• Views: 2,358
05-22-2014, 04:59 AM
12. Principal component analysis (PCA) on clustered data

Hi Everyone, I am analysing data about physical condition tests on students belonging to different type of schools (general, professional,...

• Replies: 3
• Views: 1,667
03-21-2016, 03:18 AM
13. Theory of p value matching????

I am required to write about this for my lit review. I asked the stats lecturer but he said he never heard of it! could anyone hazard a guess to...

• Replies: 7
• Views: 1,602
11-13-2015, 02:25 PM
14. data analysis for likert scale

i have a group of variables being measured on a likert scale from 1 to 5, the agreement or disagreement of these variables will help me know the...

• Replies: 2
• Views: 1,676
10-01-2012, 08:39 AM
15. Measuring Neural Network Performance

Hi all, I have a set of matrix where the last column is the RESPONSE VECTOR. I have performed a backprop NN (neural network) in order to...

• Replies: 4
• Views: 5,240
12-21-2009, 04:14 PM
16. 2 or 3 way ANOVA?

Hi I'm not sure whether to use a 2 or 3 way ANOVA. My project I'm working on is focussing on one antibiotic and seeing how toxic it is at...

• Replies: 1
• Views: 1,152
05-26-2015, 07:04 AM
17. How to analyse a set of data without normality and homoscedasticity?

Hello, I'm a postgraduate student in Biology. From some time on, I wanted to publish a paper regarding the affectance of temperature to the shell...

• Replies: 0
• Views: 1,040
08-28-2015, 02:08 AM
18. Which version of the Chi-Square test should I use?

Hello, I am doing an honors project at my university. It is for my stat's class and due to the very short length of our class we did not cover the...

• Replies: 0
• Views: 938
11-09-2013, 09:53 PM
19. 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: 1,942
01-31-2012, 06:52 PM
20. Need assistance to conduct a validation of research instrument

I'm completing a PhD degree and need help from five PhD holders in order to conduct an instrument validation (face value and content validation). The...

• Replies: 0
• Views: 1,729
04-29-2012, 06:48 PM
21. Have population, use inferential stats? Non-normal dependent variable, what to do?

Statistics people! I have two questions for you. I am NOT a statistician so please be nice and answer simply :) Background: We are looking at...

• Replies: 1
• Views: 1,336
06-20-2014, 09:07 PM
22. Can I use regression to increase sample size of survey responders?

I have a question about how I can extrapolate responses from a survey to apply to the entire population with a decent level of confidence and...

• Replies: 1
• Views: 1,198
07-24-2013, 05:26 PM
23. attributes of individuals in discrete choice tasks

Hello stat talkers, :wave: I'm currently working on a marketing (discrete choice) project concerning brand choice and I stumbled upon some questions...

• Replies: 3
• Views: 3,431
11-23-2009, 04:23 AM
24. compute true values monte carlo simulation

Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

• Replies: 16
• Views: 6,724
07-04-2010, 05:19 AM
25. confidence interval for the median(Wilcoxon)

Hello.I have a project with subject the confidence interval for the median(Wilcoxon) and i can't find any information.I would appreciate it if...

• Replies: 0
• Views: 1,226
06-16-2014, 02:35 PM
26. Multi Modal Example trying to assess correct Statiscal approach

I am trying to figure out the best statistical approach to address a problem. I am looking at 100 retail stores and looking at their hourly traffic....

• Replies: 1
• Views: 1,176
01-12-2016, 01:52 PM
27. How to report t-test results

Hi, Im having trouble writting the result of a null hypothesis. so far this was the template i was using when reporting the result of a...

• Replies: 1
• Views: 12,649
10-20-2011, 11:45 PM
28. How to create a representative sample?

Hello to all! :) I have recently launched a survey to students of specific universities among European countries and got nearly 3000 replies....

• Replies: 2
• Views: 2,445
11-04-2013, 09:39 PM
29. Identifying the better "performers" in groups of uneven population

Hello. If the answer to this question is out there, the internet has hidden it pretty well... I've got 5 groups, each with a different...

• Replies: 1
• Views: 890
12-04-2012, 04:29 PM
30. Augment a sample to improve goodness-of-fit

Hi all, Lets say I have a sample from a normal (or any other) distribution, and the goodness-of-fit is reasonable. It is possible to improve this...

• Replies: 0
• Views: 1,431
06-24-2013, 05:05 AM
31. Is this method to post-hoc determine the sample size a known one?

Hi all! In the last weeks I'm facing the issue of determining if my sample is big enough to describe the world population. Apart from the usual...

• Replies: 3
• Views: 1,834
12-12-2014, 08:16 AM
32. What statistical test do i need to run?

Hi there folks, I'm having a little difficulty choosing what statistical test i need to run, I've conducted a series of behavioural experiments,...

• Replies: 0
• Views: 1,168
12-16-2013, 06:56 PM
33. t-test or Mann-Whitney test

I am comparing two samples of IPO (Initial public offerings) companies using t-test and Wilcoxon Mann Whitney Test. But since I am comparing 102 IPO...

• Replies: 7
• Views: 2,366
08-26-2013, 04:39 PM
34. white test for heteroskedasticity

Hi everyone In STATA, how to inerpret the results of the heteroskedasticity test? I typed in imtest, white to do the test, and got these results:...

• Replies: 0
• Views: 3,274
09-15-2013, 08:50 PM
35. Mancova help

Hello everyone, I wanted to test the effectiveness of a new teaching method. I asked 5 teachers to use this new method in their classes, and used...

• Replies: 0
• Views: 1,445
06-30-2011, 08:58 AM
36. Frequency data analysis - repeated measures, between groups

Hi, I am using SPSS and testing frequency data before and after a treatment, plus follow-up. The variable I am looking at is frequency of symptoms...

• Replies: 3
• Views: 1,481
11-01-2012, 06:17 PM
37. GOF / Diagnostics for a GLM Binomial-Logit Family Model STATA

Hello, I am using a GLM Binomial-Logit Family Model. I am using this model because my dependent variable is a proportion. Having carried out the...

• Replies: 0
• Views: 4,171
05-20-2010, 03:59 AM
38. Difference between VCV by inverting Hessian at ML and by Hierarchical Bayes

Let's say we have a multimomial logit problem and we find the best beta coeffcients b* aggregating all units. The inverse of the Hessian at b* gives...

• Replies: 0
• Views: 1,110
06-10-2014, 09:59 AM
39. Monte Carlo simulation: how many runs?

Hi, Most papers I read related to Monte Carlo (MC) simulation method say that there is no rule on the minimum number of runs required. However, in...

• Replies: 12
• Views: 6,110
BGM
04-07-2015, 06:21 AM
40. Trying to find MS Excel Wilcoxon Rank Sum test example

I am a pharmacy student doing a 4th year (final year) Capstone Research Project. I am attempting to run my data utilizing a Wilcoxon Rank Sum Test...

• Replies: 1
• Views: 1,249
12-01-2015, 08:55 PM
41. 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
42. sum of truncated Normal Variables

Hello all, I am trying to find if there exists a closed solution for the following: X~N(u,var) {normal dist) Y~N((u,var)|Y>a) {truncated normal...

• Replies: 0
• Views: 3,185
08-21-2012, 03:23 AM
43. Statistical Independence

I'm trying to give my students a brief introduction to chi-square testing, but there's something that's a little confusing to me regarding the...

• Replies: 1
• Views: 3,420
04-27-2011, 11:02 PM
44. non-parametric test for repeated measurement

Hello everyone, I would like to know if some non-parametric test is available to asses wether 2 samples come from the same distribution for repeated...

• Replies: 4
• Views: 5,372
11-17-2008, 04:34 AM
45. statistical power of a General Linear Mixed Model with repeated measurements

Hello, I would like to be able to calculate the statistical power of a General Linear Mixed Model. This model is applied on longitudinal data on...

• Replies: 0
• Views: 3,773
04-15-2009, 07:37 AM
46. Median or Mean vs Data distribution

Hi, I am stuck at this point in my thesis in selected between Median and Mean. My data and work: I have a set of data X, and for each data y...

• Replies: 3
• Views: 3,239
12-26-2016, 09:50 AM
47. Using statistical analysis to show hybrid performance gains

Are there any statistical analysis techniques that i can use for the following scenario? As part of my report, i was asked to study the fuel...

• Replies: 1
• Views: 1,611
08-04-2011, 02:38 PM
48. Best test to use?

Hi Everyone, I am trying to design a medical study and having difficult for teh best to use, in summary: Stage 1: Patients are classified into...

• Replies: 0
• Views: 1,636
09-15-2011, 06:02 PM
49. Which test?

I am trying desperately to figure out which test I should use. I want to test if self-efficacy survey results and/or internship opportunities result...

• Replies: 1
• Views: 1,929
09-21-2014, 06:15 AM
50. Uncertainty

Hi there, If I take measurements every minute for a whole hour, and I know the uncertainty of a single measurement, is it possible to calculate...

• Replies: 1
• Views: 2,718
05-20-2009, 06:42 PM
51. How to do a Validation Study?

My professor has asked me to do a validation study but I have never done one before and don't know what methodology or statistics to use. Basically...

• Replies: 1
• Views: 5,154
12-17-2014, 01:05 AM
52. Univariate vs Multivariate results

Hi, Am I correct in assuming that if a variable was found to be good predictor in univariate analysis, it should also be found to be a good...

• Replies: 0
• Views: 1,143
03-08-2015, 05:19 AM
53. Which statistical test to use to establish different behaviour between groups?

Hi, I have got a dataset with a dichotomous groupid variable and many other independent categorical variables. My aim is to find out if subjects...

• Replies: 0
• Views: 1,726
03-08-2015, 05:20 AM
54. Need Help ALL STatistition

ANy one can tell me what is a major difference between bonferoni correction and sidak correction ???

• Replies: 2
• Views: 1,735
09-17-2013, 12:41 PM
55. Test-retest repeatability

Hello, I have some questions regarding the use of ICC (intraclass correlation coefficient) to measure the repeatability of a 146-item...

• Replies: 0
• Views: 5,191
11-22-2010, 08:38 AM
56. Is Levene's transformation with ANOVA equivalent to Levene's W?

Hello, Just a quick question that I have been pondering: I read an article (Plavcan and Cope, 2001 Evol. Anthro.) where they say that Levene's test...

• Replies: 0
• Views: 5,390
03-25-2011, 09:36 PM
57. How to generate right censored data

Hi all, I want to generate some data from a given distribution, let say exponential distribution. But I do not now how. Any help would be...

• Replies: 1
• Views: 5,167
05-27-2009, 04:34 PM

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