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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: 18,712
10-11-2014, 12:02 PM
1. ### Statistical analysis for Rubric Based Research

There are 26 participants who have participated in my research. Each participant treated with a lab module (Hands on Robotics Session). Now each...

• Replies: 3
• Views: 2,974
06-17-2012, 08:48 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: 2,972
01-31-2012, 01:18 PM
3. ### Need Help in identifying problem

Hello all, Imagine you have two time series X1,X2,...Xt - represents incoming volume to the yard, and Y1,Y2,...,Yt - outgoing volume from the...

• Replies: 2
• Views: 2,971
07-06-2010, 08:36 PM
4. ### Absolute or relative changes?

I would like to compare the changes in salt excretion caused by a saline infusion in a group of patients studied under high sodium and low sodium...

• Replies: 0
• Views: 2,963
06-16-2009, 04:57 AM
5. ### Longitudinal Data Analysis

Hello people, I need some help with LDA, I have important home work to do and I have a problem. I got autocorrelation of a model: (obs=70) ...

• Replies: 0
• Views: 2,962
07-28-2008, 05:28 AM
6. ### Internal consistency reliability

Hi there, I have a question about the internal consistency reliability. In a within-subject design, I created a 13-item of self-repeated 9-point...

• Replies: 0
• Views: 2,962
10-11-2010, 07:52 AM
7. ### Correlation length

Hi all, I'm working on a hydrological model. I supposed to build a mesh with correlation length in the permeability field. I know what is the...

• Replies: 7
• Views: 2,958
02-08-2017, 10:34 AM
8. ### Bayes Factors using BIC statistic (model selection)

Hi, I need to compare four different models (logistic regression), model selection is performed using bayes factors using the BIC statisic. ...

• Replies: 0
• Views: 2,954
08-30-2013, 02:32 PM
9. ### best way to create ANOVA groups from a range of scores?

Hello Everyone, I have been involved in a discussion with my Experimental Methods of Psychology Instructor about the best way to divide a range of...

• Replies: 5
• Views: 2,951
09-24-2011, 04:46 AM
10. ### Quick question about reporting statistical results

Hey there, just wondering about proper reporting of results of my 2x2 ANOVA experiment: -I compared lots of morphometric measurements of sea...

• Replies: 5
• Views: 2,948
10-19-2011, 01:01 PM
11. ### More measurements to reduce CV% in RIA?

Hi, everyone! I got quite high CV% between many duplicates in my radio immunoassay experiment. I run the samples again and some results were much...

• Replies: 0
• Views: 2,948
06-11-2012, 08:15 AM
12. ### 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: 2,943
09-16-2011, 05:36 AM
13. ### continuous random variable

why the continuous random variable has to be given a Limit /Range? Cant we solve this random variable without a limit ? What is Continuous...

• Replies: 6
• Views: 2,942
06-06-2011, 03:43 PM
14. ### 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: 2,940
03-26-2014, 04:17 AM
15. ### Interpreting Ranking Data

I need help with the interpretation of ranking data. I should start by saying that I’m a writer/editor and have very little knowledge of statistical...

• Replies: 0
• Views: 2,935
10-30-2013, 08:44 AM
16. ### [R] permanova for multivariate repeat measures toxicology data set

Hello, I would like to use a permanova to analyze my repeated measures, multivariate data set using the package vegan (adonis function) in R. I...

• Replies: 0
• Views: 2,932
07-12-2013, 03:55 PM
17. ### Paired t- test experiment

Hello, I have a sample 20 super market stores of a specific chain (who has in total 100 super market stores). In 1st of July there was an increase...

• Replies: 0
• Views: 2,926
05-14-2011, 05:34 AM
18. ### how to calculate SD or SEM of ratios?

I have 2 groups of data. Group1: x1,x2,x3,x4. Group2:y1,y2,y3,y4. I want to get the ratio of y over x (Y/X) and also needs to know the SD or SEM of...

• Replies: 3
• Views: 2,926
07-10-2014, 08:34 AM
19. ### Research Query

Hello, hope someone can help. I've been having trouble with some data I have collected. I have been taking a series of 12 measurements using three...

• Replies: 4
• Views: 2,923
07-20-2011, 12:40 AM
20. ### Tolerance intervals for binomial

I'm trying to learn more about tolerance intervals for a binomial distribution, but am struggling to find much literature about them. Does anyone...

• Replies: 0
• Views: 2,923
09-30-2011, 04:10 AM
21. ### Using a proportion as an effect size in meta-analysis

Hey TS, I have a question about using a proportion as an effect size in a meta-analysis. Let's say, for example, that I am interested in a...

• Replies: 1
• Views: 2,919
08-08-2012, 08:51 PM
22. ### New guy, Stats help needed with this problem.

Hi guys, I'm taking Mathematical Statistics course and we are following Statistical Inference book by George Casella. I was able to solve most of...

• Replies: 3
• Views: 2,918
10-11-2007, 11:30 AM
23. ### What's the correct correction factor? Multiple one-sample and paired tests...

This question concerns the chance of Type I error in hypothesis testing with multiple statistical tests. The data come from a series of experiments....

• Replies: 6
• Views: 2,918
11-28-2014, 08:13 PM
24. ### GAMs: test of simple effects following a significant interaction

Hello, I am a novice in Generalized Additive Models (GAMs) and I would need some advice on these models. From capture data, I would like to...

• Replies: 0
• Views: 2,917
11-22-2016, 01:44 PM
25. ### Discriminant analysis with mostly incomplete cases

Hello. I have a bit of a biostats problem. I’ve got data on 5 groups and 15 species. There are 9 variables, and 1000 cases total. The problem,...

• Replies: 6
• Views: 2,914
03-02-2009, 12:52 AM
26. ### Rank Based Inverse Normal Transformations for Scales

Hi everyone, I am trying to fix my normality distribution among a series of psychological and social science scales so that I can perform pearsons...

• Replies: 0
• Views: 2,914
08-02-2013, 07:23 AM
27. ### Mediation Hypothesis

Hi all, I am in desperate need of somebody who is familiar with bootstrapping in SPSS to test a mediation hypothesis. I have installed the...

• Replies: 0
• Views: 2,912
10-06-2012, 03:39 AM
28. ### By-item random intercepts--to include or not to include?

We're hoping someone can shed light on this one... :) In experiments involving human subjects, samples are taken from the population. The same can...

• Replies: 1
• Views: 2,909
01-01-2010, 02:46 PM
29. ### Prerequisite for gene regulatory network research (systems biology)

I would appreciate any advice or directions on what to study and in what order, from basic statistics and probability course to were one is able to...

• Replies: 0
• Views: 2,909
02-24-2011, 03:46 PM
30. ### Correlating behaviors in time

This is definitely off topic but still linked. I saw some of what you do TheEcologist. I asked a question on here about correlating behaviors in...

• Replies: 4
• Views: 2,908
11-04-2011, 12:27 PM
31. ### Stat guidence for a research paper

I am currently in the process of writing up a small research paper, but I am quite rusty on my stats. I was wondering if anyone could recomend either...

• Replies: 1
• Views: 2,907
10-16-2008, 02:01 AM
32. ### NLP Algorithm Evaluation: Help?

Hello guys, We're beginners here and please excuse us if our questions are inappropriate in any way. We have a statistics-related problem, and...

• Replies: 0
• Views: 2,906
06-28-2010, 03:01 PM
33. ### [SOLVED] help with some sums and squares please? :)

hey everyone! how are you all doing? so... thing. i'm having trouble following the algebraic steps on an article i'm reading. my math sumation...

• Replies: 2
• Views: 2,904
09-26-2012, 05:51 PM
34. ### Reading Research - ANCOVA?

I have a class (n=30).Using a variety of test I split them into stronger readers - SR (16), weaker readers WR (14) - Quasi-experimental I chose a...

• Replies: 0
• Views: 2,903
12-29-2009, 09:05 AM
35. ### Degrees of freedom for Chi2 normality test

I have found mixed information in regard to the number of degrees of freedom used to evaluate the chi2 statistics derived to check the normality of a...

• Replies: 3
• Views: 2,903
09-02-2014, 12:49 AM
36. ### EM Algorithm

Hi All, I am trying to implement the EM algorithm for a 3 population exponential distribution. I am having the following issues. 1. If l1_true=;9...

• Replies: 1
• Views: 2,902
03-28-2011, 07:40 PM
37. ### Which test to use?

I'm trying to compare one data point to a distribution to see if that one data point fits into the distribution. The distribution is not a normal...

• Replies: 2
• Views: 2,896
08-04-2008, 11:28 PM
38. ### Current Commentary Study

Hi what is it a Current commentary study ??? What does it mean ??? Regards

• Replies: 2
• Views: 2,896
04-30-2009, 07:52 AM
39. ### 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: 2,896
02-04-2012, 12:46 AM
40. ### ANOVA on the sampling distribution instead !

I am comparing 7 different types of stochastic algorithms. Each algorithm's performance is represented by a value (called the COST). The lower the...

• Replies: 0
• Views: 2,895
04-14-2010, 02:29 PM
41. ### Cronbach's alpha with weighted data

Hi I have a test whose reliability I want to calculate, using Cronbach's alpha. The first 18 questions are scored 0 or 1 (right or wrong). The...

• Replies: 0
• Views: 2,895
09-29-2011, 06:03 AM
42. ### Op notation

Hey Guys. It is my first time here. Glad to meet you all. I've got a question on Op notation. In my research, I've got an assumption associated...

• Replies: 2
• Views: 2,894
12-04-2010, 05:18 PM
43. ### Constucting ARMA realizations

Given estimates for the AR and MA coefficients for an ARMA(p,q) model with a non zero mean, how do I construct a realization of the time series? ...

• Replies: 0
• Views: 2,893
06-11-2008, 10:26 AM
44. ### Ranking advertisers based on performance

Hi, let's say you run an ad network and you want to rank your advertisers based on their performance. Now what most networks do is simply...

• Replies: 3
• Views: 2,892
07-13-2010, 02:23 PM
45. ### Do i use an ANCOVA for a cross over of exams, pre/post study?

I have a study i am running and would like to know the appropriate test to apply, its complicated but bear with me :) Background: We are looking...

• Replies: 0
• Views: 2,891
03-24-2016, 12:35 PM
46. ### Comparing three groups that have been analysed by Friedman's ANOVA

Dear all, I have been struggling with the following problem and would be extremely grateful for some help. :confused: I have three groups of...

• Replies: 0
• Views: 2,888
02-29-2012, 04:04 AM
47. ### What statistical test do I use?

Hi there, I'm doing a study on the influence of sexuality on a camouflaging questionnaire which has a score rating (0-40), so is an interval...

• Replies: 1
• Views: 2,888
01-07-2017, 10:12 PM
48. ### Analytic options with multi-level data?

Hello, I've been struggling with choosing an analytical approach to some multi-level data (3 level) I'm working with and wanted to get some fresh...

• Replies: 12
• Views: 2,886
01-31-2013, 01:15 PM
49. ### Assumptions of statistic models

I was watching (https://www.youtube.com/watch?v=8SGif63VW6E) and he said a statement that made me think: 8SGif63VW6E#t=134 I asked for...

• Replies: 1
• Views: 2,886
11-07-2014, 06:34 PM
50. ### quantile regression vs. non-parametric curve fit of quantiles

hello, i am doing some data analysis using a technique like the one pictured here:...

• Replies: 0
• Views: 2,884
d^2
06-23-2008, 09:54 AM
51. ### Histogram height in frequency table

My question for the above image is why is it 190 for the histogram height and 4 at the end?? My other question is why is it 15 in histogram...

• Replies: 1
• Views: 2,883
11-16-2011, 12:51 AM
52. ### Partial Least Squares

Hello, I am doing a project about "Partial Least Squares", and I find it a bit hard to understand the math part of the model. I was wondering if...

• Replies: 0
• Views: 2,882
05-24-2008, 11:20 AM
53. ### Correlation between non-independent variables

Hi, I want to conduct correlation between two variables, that have common term (difference scores). Originally there are three variables X, Y,...

• Replies: 6
• Views: 2,882
09-24-2014, 11:15 AM
54. ### Nominal variables

I use a bivariate probit model to detect the choice between two strategies. I use besides the more interesting variables, some control variables....

• Replies: 0
• Views: 2,880
12-05-2010, 09:35 AM
55. ### Interval Level

Could anybody help with game theory in accordance to penetrating a market? Thank you for your answers!

• Replies: 1
• Views: 2,878
10-08-2008, 02:11 PM
56. ### Research for Student help please

Hello all, I have to do a research report for part on my access course before degree in Sep. I have decided to study the effects of poverty...

• Replies: 2
• Views: 2,877
04-09-2010, 09:40 AM
57. ### Samples drawn from distributions without means: What inferences from subsamples?

I am doing some work for a small nonprofit on time trends in U.S. income inequality, and comparing estimates based on samples from different surveys....

• Replies: 1
• Views: 2,875
11-19-2010, 01:05 AM
58. ### MANOVA interpretation

Hello Everyone, I have a couple questions regarding the interpretation & reporting of a recent MANOVA that I ran. A little background on this...

• Replies: 0
• Views: 2,875
03-16-2012, 04:13 PM
59. ### Need help defining terms for mixed model nested ANOVA

Hello - I am looking at the effects of restoration practices on a suite of environmental soil parameters through time. I am having trouble defining...

• Replies: 5
• Views: 2,875
07-16-2012, 04:59 PM

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