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Threads 901 to 960 of 3193

Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

  1. Sticky Thread 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...

    Started by Englund‎, 01-18-2014 04:56 AM
    • Replies: 14
    • Views: 18,712
    10-11-2014, 12:02 PM Go to last post
  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...

    Started by jnrntr‎, 06-14-2012 11:06 PM
    chi square, hypothesis testing
    • Replies: 3
    • Views: 2,974
    06-17-2012, 08:48 PM Go to last post
  2. Bonferroni-Holm adjustment

    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...

    Started by lancearmstrong1313‎, 01-30-2012 02:31 PM
    • Replies: 2
    • Views: 2,972
    01-31-2012, 01:18 PM Go to last post
  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...

    Started by Tart‎, 07-06-2010 01:51 PM
    • Replies: 2
    • Views: 2,971
    07-06-2010, 08:36 PM Go to last post
  4. What is Endogeneity?

    Hi! The title says it all. I am a health care worker currently going through a really interesting paper. I have some experience in statistics but...

    Started by plagoniste‎, 09-17-2015 03:31 PM
    • Replies: 11
    • Views: 2,971
    09-17-2015, 08:44 PM Go to last post
  5. 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...

    Started by Carolina‎, 06-16-2009 04:57 AM
    • Replies: 0
    • Views: 2,963
    06-16-2009, 04:57 AM Go to last post
  6. 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) ...

    Started by WeeG‎, 07-28-2008 05:28 AM
    • Replies: 0
    • Views: 2,962
    07-28-2008, 05:28 AM Go to last post
  7. Thumbs down 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...

    Started by C_SH_Yeh‎, 10-11-2010 07:52 AM
    • Replies: 0
    • Views: 2,962
    10-11-2010, 07:52 AM Go to last post
  8. 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...

    Started by Evyatar‎, 02-02-2017 04:14 AM
    correlation, correlation length
    • Replies: 7
    • Views: 2,958
    02-08-2017, 10:34 AM Go to last post
  9. Lightbulb 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. ...

    Started by Sophiie‎, 08-30-2013 02:32 PM
    bayesian, bic, logistic regression, model selection
    • Replies: 0
    • Views: 2,954
    08-30-2013, 02:32 PM Go to last post
  10. 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...

    Started by Patrick Turbiville‎, 09-23-2011 03:21 PM
    • Replies: 5
    • Views: 2,951
    09-24-2011, 04:46 AM Go to last post
  11. 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...

    Started by aesopclimber‎, 10-15-2011 01:51 PM
    • Replies: 5
    • Views: 2,948
    10-19-2011, 01:01 PM Go to last post
  12. 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...

    Started by Nixa‎, 06-11-2012 08:15 AM
    • Replies: 0
    • Views: 2,948
    06-11-2012, 08:15 AM Go to last post
  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...

    Started by micdhack‎, 09-15-2011 05:34 AM
    • Replies: 9
    • Views: 2,943
    09-16-2011, 05:36 AM Go to last post
  14. 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...

    Started by edifier‎, 06-03-2011 06:14 PM
    • Replies: 6
    • Views: 2,942
    06-06-2011, 03:43 PM Go to last post
  15. Post 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...

    Started by AkaKiwi‎, 03-23-2014 06:30 AM
    • Replies: 5
    • Views: 2,940
    03-26-2014, 04:17 AM Go to last post
  16. Interpreting Ranking Data

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

    Started by EricSchoeniger‎, 10-30-2013 08:44 AM
    • Replies: 0
    • Views: 2,935
    10-30-2013, 08:44 AM Go to last post
  17. [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...

    Started by e2012‎, 07-12-2013 03:55 PM
    adonis, permanova, repeat measures
    • Replies: 0
    • Views: 2,932
    07-12-2013, 03:55 PM Go to last post
  18. 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...

    Started by zarasandreas‎, 05-14-2011 05:34 AM
    • Replies: 0
    • Views: 2,926
    05-14-2011, 05:34 AM Go to last post
  19. 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...

    Started by huimeizheng‎, 07-09-2014 01:33 AM
    • Replies: 3
    • Views: 2,926
    07-10-2014, 08:34 AM Go to last post
  20. 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...

    Started by PB66‎, 07-19-2011 11:26 AM
    • Replies: 4
    • Views: 2,923
    07-20-2011, 12:40 AM Go to last post
  21. 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...

    Started by duskstar‎, 09-30-2011 04:10 AM
    • Replies: 0
    • Views: 2,923
    09-30-2011, 04:10 AM Go to last post
  22. 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...

    Started by Rhodo‎, 08-08-2012 08:43 PM
    • Replies: 1
    • Views: 2,919
    08-08-2012, 08:51 PM Go to last post
  23. 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...

    Started by $tatsGuy‎, 10-10-2007 09:48 PM
    • Replies: 3
    • Views: 2,918
    10-11-2007, 11:30 AM Go to last post
  24. 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....

    Started by 5tudent‎, 11-21-2014 06:15 PM
    bonferroni, correction, familywise, pairwise, t-test
    • Replies: 6
    • Views: 2,918
    11-28-2014, 08:13 PM Go to last post
  25. 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...

    Started by MarineRegis‎, 11-22-2016 01:44 PM
    gam model, interaction term
    • Replies: 0
    • Views: 2,917
    11-22-2016, 01:44 PM Go to last post
  26. Discriminant analysis with mostly incomplete cases

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

    Started by Dorquemada‎, 01-29-2009 07:01 PM
    • Replies: 6
    • Views: 2,914
    03-02-2009, 12:52 AM Go to last post
  27. 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...

    Started by kbabs987‎, 08-02-2013 07:23 AM
    • Replies: 0
    • Views: 2,914
    08-02-2013, 07:23 AM Go to last post
  28. Question 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...

    Started by richieboy‎, 10-06-2012 03:39 AM
    • Replies: 0
    • Views: 2,912
    10-06-2012, 03:39 AM Go to last post
  29. 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...

    Started by at474‎, 11-10-2009 10:14 AM
    • Replies: 1
    • Views: 2,909
    01-01-2010, 02:46 PM Go to last post
  30. 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...

    Started by anog‎, 02-24-2011 03:46 PM
    biology, cell, model selection, system biology, systems
    • Replies: 0
    • Views: 2,909
    02-24-2011, 03:46 PM Go to last post
  31. 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...

    Started by trinker‎, 11-03-2011 10:57 AM
    • Replies: 4
    • Views: 2,908
    11-04-2011, 12:27 PM Go to last post
  32. 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...

    Started by mbeckert‎, 09-22-2008 03:04 AM
    • Replies: 1
    • Views: 2,907
    10-16-2008, 02:01 AM Go to last post
  33. Question 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...

    Started by gvadalkivir‎, 06-28-2010 03:01 PM
    • Replies: 0
    • Views: 2,906
    06-28-2010, 03:01 PM Go to last post
  34. [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...

    Started by spunky‎, 09-26-2012 05:19 PM
    • Replies: 2
    • Views: 2,904
    09-26-2012, 05:51 PM Go to last post
  35. Exclamation 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...

    Started by Grant‎, 12-29-2009 09:05 AM
    • Replies: 0
    • Views: 2,903
    12-29-2009, 09:05 AM Go to last post
  36. 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...

    Started by Riccardo‎, 09-01-2014 04:31 PM
    chi square, chi square test, degrees of freedom, normality test
    • Replies: 3
    • Views: 2,903
    09-02-2014, 12:49 AM Go to last post
  37. 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...

    Started by raghustats‎, 03-20-2011 12:27 PM
    • Replies: 1
    • Views: 2,902
    03-28-2011, 07:40 PM Go to last post
  38. 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...

    Started by sleck‎, 07-30-2008 10:49 AM
    • Replies: 2
    • Views: 2,896
    08-04-2008, 11:28 PM Go to last post
  39. Current Commentary Study

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

    Started by viwel‎, 04-28-2009 07:05 AM
    • Replies: 2
    • Views: 2,896
    04-30-2009, 07:52 AM Go to last post
  40. 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...

    Started by Millie‎, 02-01-2012 02:51 AM
    • Replies: 2
    • Views: 2,896
    02-04-2012, 12:46 AM Go to last post
  41. 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...

    Started by marvinb‎, 04-14-2010 02:29 PM
    • Replies: 0
    • Views: 2,895
    04-14-2010, 02:29 PM Go to last post
  42. 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...

    Started by jimbowylie‎, 09-29-2011 06:03 AM
    cronbach's alpha, research, weighted data
    • Replies: 0
    • Views: 2,895
    09-29-2011, 06:03 AM Go to last post
  43. 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...

    Started by hslinhc‎, 11-13-2010 03:59 AM
    • Replies: 2
    • Views: 2,894
    12-04-2010, 05:18 PM Go to last post
  44. 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? ...

    Started by devlynn167‎, 06-11-2008 10:26 AM
    • Replies: 0
    • Views: 2,893
    06-11-2008, 10:26 AM Go to last post
  45. 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...

    Started by FlashStats‎, 07-10-2010 10:22 AM
    • Replies: 3
    • Views: 2,892
    07-13-2010, 02:23 PM Go to last post
  46. 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...

    Started by Damo123‎, 03-24-2016 12:35 PM
    • Replies: 0
    • Views: 2,891
    03-24-2016, 12:35 PM Go to last post
  47. 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...

    Started by Tulip‎, 02-29-2012 04:04 AM
    friedman's anova, mixed-design, non-parametric
    • Replies: 0
    • Views: 2,888
    02-29-2012, 04:04 AM Go to last post
  48. 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...

    Started by Mohil‎, 01-06-2017 11:16 AM
    • Replies: 1
    • Views: 2,888
    01-07-2017, 10:12 PM Go to last post
  49. 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...

    Started by schunajm‎, 08-05-2012 02:52 PM
    • Replies: 12
    • Views: 2,886
    01-31-2013, 01:15 PM Go to last post
  50. 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...

    Started by trinker‎, 11-07-2014 05:20 PM
    • Replies: 1
    • Views: 2,886
    11-07-2014, 06:34 PM Go to last post
  51. quantile regression vs. non-parametric curve fit of quantiles

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

    Started by d^2‎, 06-23-2008 09:54 AM
    • Replies: 0
    • Views: 2,884
    06-23-2008, 09:54 AM Go to last post
  52. 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...

    Started by newbiestats‎, 11-15-2011 10:29 PM
    • Replies: 1
    • Views: 2,883
    11-16-2011, 12:51 AM Go to last post
  53. 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...

    Started by WeeG‎, 05-24-2008 11:20 AM
    • Replies: 0
    • Views: 2,882
    05-24-2008, 11:20 AM Go to last post
  54. 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,...

    Started by random_guest‎, 09-17-2014 06:14 PM
    • Replies: 6
    • Views: 2,882
    09-24-2014, 11:15 AM Go to last post
  55. 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....

    Started by momo‎, 12-05-2010 09:35 AM
    • Replies: 0
    • Views: 2,880
    12-05-2010, 09:35 AM Go to last post
  56. Interval Level

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

    Started by equaglia‎, 10-08-2008 01:40 PM
    • Replies: 1
    • Views: 2,878
    10-08-2008, 02:11 PM Go to last post
  57. 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...

    Started by Urban Colour‎, 04-09-2010 07:45 AM
    • Replies: 2
    • Views: 2,877
    04-09-2010, 09:40 AM Go to last post
  58. 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....

    Started by AndrewHoerner‎, 11-02-2010 02:13 PM
    • Replies: 1
    • Views: 2,875
    11-19-2010, 01:05 AM Go to last post
  59. 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...

    Started by mwill101‎, 03-16-2012 04:13 PM
    • Replies: 0
    • Views: 2,875
    03-16-2012, 04:13 PM Go to last post
  60. 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...

    Started by AASSBB‎, 07-08-2012 05:09 PM
    mixed model anova, nested anova
    • Replies: 5
    • Views: 2,875
    07-16-2012, 04:59 PM Go to last post

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