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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: 19,405
    10-11-2014, 12:02 PM Go to last post
  1. 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: 3,142
    10-11-2007, 11:30 AM Go to last post
  2. Help Anova

    hi everyone, I currently try to find an open source C/C++statistical library. Basically, I want to calculate the p and F value from oneway (or N...

    Started by 02020954‎, 12-12-2005 07:11 PM
    • Replies: 11
    • Views: 4,776
    12-14-2005, 05:55 PM Go to last post
  3. Which statistical test to use for the following scenario?

    Firstly, thanks for taking the time to read my post. The scenario: I have 20 novice darts players- split into 5 teams. They're told it's a darts...

    Started by 03turnerS‎, 04-09-2013 07:36 PM
    • Replies: 3
    • Views: 2,391
    04-10-2013, 12:33 AM Go to last post
  4. What test to identify words used more frequently by one group than another?

    I have two groups of subjects, A and B. I have a text sample produced by each subject. My goal is to idenitfy those words that are used significantly...

    Started by 1234‎, 07-29-2013 12:53 PM
    frequency, word
    • Replies: 6
    • Views: 1,740
    07-29-2013, 03:23 PM Go to last post
  5. Videopods

    Is anyone aware of any videopods that cover econometrics courses (especially time series and cross sectional analysis?

    Started by 12345678‎, 02-25-2009 12:15 PM
    • Replies: 0
    • Views: 2,180
    02-25-2009, 12:15 PM Go to last post
  6. gender differences

    Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

    Started by 12345678‎, 04-10-2009 01:08 AM
    • Replies: 6
    • Views: 5,152
    05-09-2009, 07:40 PM Go to last post
  7. panel data regressions

    Hi, I used matlab to run unbalanced panel data analysis (attached) . I am finding difficulties finding out whether my model is valid with the huge...

    Started by 12345678‎, 10-15-2011 07:30 PM
    • Replies: 0
    • Views: 3,776
    10-15-2011, 07:30 PM Go to last post
  8. Interpreting the interaction effect in a well known paper

    Attached you will find a well known research paper. If you go to page 438 (page 9 of the pdf file) you will find a model where: change in tax rate...

    Started by 12345678‎, 12-30-2016 04:25 PM
    • Replies: 5
    • Views: 4,284
    01-01-2017, 01:40 PM Go to last post
  9. Which Non-parametric Significance Test Should I Use?

    Hi, I've been working on a little project. Last year I delivered pizzas. I recorded data for 300 of my deliveries like tip amounts, order totals,...

    Started by 13gentj‎, 06-07-2016 08:36 PM
    exact test, fail assumptions, non-normal, permutation test, randomization test
    • Replies: 5
    • Views: 2,246
    06-09-2016, 02:34 AM Go to last post
  10. Hypothsis Testing

    In a training center, a new strategy was implemented. After the implementation of this new strategy the training center claimed that on an average...

    Started by 17.abhi‎, 09-30-2013 12:07 PM
    • Replies: 2
    • Views: 1,499
    09-30-2013, 01:30 PM Go to last post
  11. Risk Averse

    A store has enough employees to attend to customers that are flowing into it at an average rate of 25 per hour. Should the store manager be employing...

    Started by 17.abhi‎, 09-30-2013 12:13 PM
    probability distribution
    • Replies: 1
    • Views: 1,612
    09-30-2013, 01:38 PM Go to last post
  12. Testing Model Fit between Subsets of Data When Using Multilevel Models

    When using multilevel models based on maximum likelihoods, one can use either deviance statistics (e.g., -2LLs) for nested models or information...

    Started by 3.14159‎, 11-18-2015 03:49 PM
    maximum likehood, model fit, mulitilevel model
    • Replies: 0
    • Views: 1,152
    11-18-2015, 03:49 PM Go to last post
  13. Covariate Estimation & Unbiased Estimation

    I work with a group that utilizes the Mahalanobis Distance to detect the health of a system, mostly electronics. Within this research, we are looking...

    Started by 3waytie4last‎, 09-10-2008 12:41 PM
    • Replies: 0
    • Views: 4,287
    09-10-2008, 12:41 PM Go to last post
  14. Mahalanobis Distance

    I am doing research concerning the degradation of a particular system... In this case, a cooling fan for a computer. I am measuring three...

    Started by 3waytie4last‎, 09-11-2008 09:42 AM
    • Replies: 0
    • Views: 4,787
    09-11-2008, 09:42 AM Go to last post
  15. 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: 3,104
    11-28-2014, 08:13 PM Go to last post
  16. Help understanding results of this radomized controlled trial.

    In the following published paper linked to below, could someone explain the meaning of this quote: Link to publication that the quote is from:...

    Started by 7055‎, 11-21-2015 05:44 PM
    • Replies: 2
    • Views: 1,396
    11-22-2015, 10:20 AM Go to last post
  17. basic question about variance of categorical data

    So I have some data regarding items people have selected, and the people are separated into groups. I'm interested in whether or not one group has...

    Started by 80past2‎, 02-06-2012 03:31 PM
    • Replies: 1
    • Views: 2,375
    02-10-2012, 06:33 PM Go to last post
  18. Analysis of 5 point Likert Scale Data

    I am working on analysis of a survey conducted with a 5 point likert agreement scale. I need to explain why 70% agreement (combined agreed and...

    Started by AAA‎, 12-15-2009 12:12 AM
    • Replies: 1
    • Views: 12,717
    12-15-2009, 08:47 PM Go to last post
  19. Finding cyclic function from points with more than 2 indep. variables

    Hello, I am doing my master thesis in Electrical engineering about the impact of the humidity and temperature on power consumption I have a...

    Started by aahh1982‎, 12-11-2010 08:45 PM
    • Replies: 0
    • Views: 3,556
    12-11-2010, 08:45 PM Go to last post
  20. How to calculate credibility interval limits

    Hi everyone. My name is Choi. I'm working on detecting drug adverse reaction signals using health insurance data. I have a problem in getting...

    Started by aamssa‎, 09-14-2011 02:52 AM
    • Replies: 2
    • Views: 5,641
    09-14-2011, 09:32 PM Go to last post
  21. A question on adjusted f effect size formula

    The F adjusted formula as I am aware is: sqrt where a is the number of conditions (a=3 for my case), N the total sample size (N=30 for my case...

    Started by Aaron Ang‎, 09-22-2017 03:31 AM
    • Replies: 0
    • Views: 316
    09-22-2017, 03:31 AM Go to last post
  22. Npar K-S test acceptable for normailty test??

    hi just testing parametric assumptions and realised that they are 2 ways to check Kolmogorov-Smirnov Test. 1) Analyze-Nonparametric Tests-1-Sample...

    Started by aarong‎, 07-14-2011 01:58 PM
    • Replies: 1
    • Views: 3,535
    07-14-2011, 05:42 PM Go to last post
  23. 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: 3,049
    07-16-2012, 04:59 PM Go to last post
  24. Chi and linear-by-linear

    A quick question about the use of linear-by-linear association tests for small samples - with a structure greater than 2X2. As we know, a chi...

    Started by abacus‎, 03-13-2013 11:45 AM
    • Replies: 4
    • Views: 4,840
    03-14-2013, 01:37 AM Go to last post
  25. BMA (Bayesian Model Averaging ) or a classic fixed effects macro panel ?

    Hey folks I would like your opinion..So I need to decide between a BMA (Bayesian Model Averaging ) or a classic fixed effects macro panel in order to...

    Started by abc‎, 12-22-2013 01:55 PM
    • Replies: 0
    • Views: 1,075
    12-22-2013, 01:55 PM Go to last post
  26. Can't find a convenient test for this huge dataset :-(

    Hi everyone, I have some trouble choosing the right test for the following study: I have a group of parents and a lot of ordinal measures. I...

    Started by Abdel‎, 05-12-2009 08:55 PM
    • Replies: 0
    • Views: 2,942
    05-12-2009, 08:55 PM Go to last post
  27. Multivariate generalization of Poisson-Gamma model?

    Hello! I actually assumed it would be easy to find a multivariate version of the Poisson distribution, but couldn't find any concrete solution (in...

    Started by abdhk383‎, 10-29-2015 08:01 AM
    • Replies: 0
    • Views: 1,347
    10-29-2015, 08:01 AM Go to last post
  28. Principal Component Analysis

    hi guys, sorry to bother you. would like to seek help on principal component analysis regarding the interpretation of data or on how its going...

    Started by abdul.karim‎, 03-26-2011 02:12 AM
    • Replies: 1
    • Views: 4,470
    08-01-2012, 03:32 AM Go to last post
  29. Failed Assumptions for a Two-Way Manova

    My dataset from an archival data source has failed to meet assumptions. Here's a paragraph from my dissertation. The Kolmogorov-Smirnov test of...

    Started by abelltx‎, 10-29-2017 09:19 AM
    • Replies: 1
    • Views: 189
    11-13-2017, 07:13 PM Go to last post
  30. Problem in Structural Breaks

    Suppose, if I draw samples of different sizes at time t=1,2,..,T,T+1,..,2T where the sample sizes could be different and the observed variable is a...

    Started by abhic_1983‎, 05-10-2016 12:17 AM
    bai-perron test, shapiro wilk, structural breaks
    • Replies: 0
    • Views: 1,159
    05-10-2016, 12:17 AM Go to last post
  31. indirect influence

    How do I analyze an indirect influence? I have 6 variables (A-F) that have an influence on Y. Now I want to know if X has an influence on A-F, so...

    Started by Abigail‎, 11-14-2013 04:10 PM
    • Replies: 0
    • Views: 1,362
    11-14-2013, 04:10 PM Go to last post
  32. Help with real estate statistics.

    I am a real estate appraiser in California. I want to conduct a study that will tell me what certain aspects of properties, like bedrooms, square...

    Started by ablackburn‎, 11-11-2012 11:28 AM
    home, real estate, statisics
    • Replies: 2
    • Views: 1,395
    11-11-2012, 03:25 PM Go to last post
  33. Comparing two groups - best test to use?

    Hi all, I have two sets of data - hospital admission lengths (measured in whole hours) grouped in to 'younger patients' and 'older patients'....

    Started by AbnormallyDistributed‎, 08-29-2016 10:48 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,856
    09-06-2016, 03:43 PM Go to last post
  34. Easy Standardization Question

    Hello everyone, I have a hopefully solveable question, however, I would like to get your opinion on it, as I am not 100% sure. I have a dataset...

    Started by Absolutlyclueless‎, 05-30-2012 04:15 AM
    • Replies: 0
    • Views: 1,376
    05-30-2012, 04:15 AM Go to last post
  35. Analyzing Pooled Likert Data

    Hi Everyone, I'm analyzing Likert Survey Responses for a question "How satisfied are you with your Item?" (1 = Very Dissatisfied / 5 = Very...

    Started by ac2013‎, 09-13-2013 06:21 AM
    • Replies: 3
    • Views: 1,100
    10-01-2013, 08:40 AM Go to last post
  36. Unequal sample sizes - one-way ANOVA and MANOVA

    Hello everyone:wave:, I know that unequal sample sizes would confound IVs in factorial design. But how about in one way analysis? How and...

    Started by acchan‎, 09-27-2013 03:51 AM
    • Replies: 0
    • Views: 1,842
    09-27-2013, 03:51 AM Go to last post
  37. Spearman correlation

    After collecting data from 1000 questionnaires, I have found that the variables are not normally distributed. If I want to test the correlations...

    Started by acchan‎, 11-17-2013 10:35 PM
    • Replies: 0
    • Views: 1,197
    11-17-2013, 10:35 PM Go to last post
  38. markov chain modelling

    Hi guys, Got a complex question regarding markov chain modelling. I'll start off with an example. Say you own a credit card and you can only...

    Started by ace123‎, 08-22-2008 04:51 PM
    • Replies: 7
    • Views: 4,653
    08-23-2008, 09:12 PM Go to last post
  39. How to compare multiple testers wine ratings?

    Newbie alert! Problem description: I have 20 wines and 6 tasters. Each taster ranks the wines from 1 to 20. Question: How do I test the...

    Started by achalk‎, 06-24-2013 07:05 PM
    • Replies: 8
    • Views: 1,576
    06-25-2013, 07:48 AM Go to last post
  40. Sensitivity Analysis for Multivariable Problem

    Hello all, first off I hope this is in the right forum and thanks for reading. I am a practicing engineer and have run into a problem where I have...

    Started by Acorogia‎, 12-23-2011 06:39 PM
    • Replies: 2
    • Views: 1,859
    01-03-2012, 02:47 PM Go to last post
  41. Enrichment / over-representation of pairs, triplets, quadruples, etc.

    Due to a lack of interest from users for over a month I would like to delete this thread.

    Started by Adam Przedniczek‎, 12-19-2015 04:01 PM
    enrichment, over-representation
    • Replies: 0
    • Views: 915
    12-19-2015, 04:01 PM Go to last post
  42. small sample size

    hi everybody. i need your help urgently... in my resource i need to measure a distribution for a Certain metal property (microscopic property)....

    Started by adam2649‎, 05-19-2015 01:02 AM
    • Replies: 0
    • Views: 759
    05-19-2015, 01:02 AM Go to last post
  43. Talking Shapley Value

    Hi, I'm trying to get a "Shapley Value" for determining each attributes utilities. I've already heard this could be done with simple excel or...

    Started by adamantem‎, 04-20-2009 04:43 AM
    • Replies: 10
    • Views: 13,745
    09-28-2012, 09:44 AM Go to last post
  44. it is must to include include ANOVA results in specified format

    Hi. My thesis has calculations that uses one-way ANOVA.There are 40 dependent variables which are needed to be compared under 14 independent...

    Started by addikted‎, 11-19-2016 03:19 AM
    • Replies: 0
    • Views: 3,663
    11-19-2016, 03:19 AM Go to last post
  45. 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

    I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) Ė e/(1 +...

    Started by Ade Sol‎, 01-27-2012 11:33 AM
    • Replies: 1
    • Views: 2,749
    01-27-2012, 11:54 AM Go to last post
  46. How to report Correspondence Analysis

    Hi. I'm busy with a scientific research honours thesis, and for my results the statistician at my university conducted a correspondence analysis...

    Started by Adri‎, 10-10-2013 02:36 AM
    correspondence analysis, eigenvalue, reporting results, scatterplot
    • Replies: 3
    • Views: 1,876
    10-10-2013, 04:48 AM Go to last post
  47. Grouping distributions together based on significance

    Hi, all: My PhD research has wandered into an area that requires more statistical analysis than I am currently comfortable with, and so I'm...

    Started by Adrian‎, 05-21-2010 11:19 AM
    • Replies: 2
    • Views: 2,168
    05-21-2010, 12:46 PM Go to last post
  48. Hey Guys I'm new and I need help

    So basically, I have a very little knowledge about using SPSS, but I'm willing to learn. The problem is I'm having hard time on how to organize the...

    Started by adrianbrah‎, 01-16-2012 12:35 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,786
    02-03-2012, 01:00 PM Go to last post
  49. Comparing two groups responses to a 5 question likert questionnaire

    I'm analyzing a likert questionnaire to determine if respondent's answered questions differently based on whether they compete frequently or...

    Started by aduray‎, 05-21-2012 09:34 PM
    • Replies: 5
    • Views: 4,631
    05-21-2012, 11:08 PM Go to last post
  50. Need help with large data set. Nested/factorial??

    I'm working with my field data and trying to understand the best way to analyze it. I have: 6 Sites 2 tide-pools per site Each pool has at...

    Started by aesopclimber‎, 11-08-2010 04:06 AM
    • Replies: 2
    • Views: 2,682
    11-08-2010, 07:51 PM Go to last post
  51. Was thinking Kendall's Tau but...(correlation)

    Hey guys, I was wondering if you could help me out with this: I have seven sites along the west coast each with two types of data and several...

    Started by aesopclimber‎, 07-20-2011 11:39 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,465
    08-15-2011, 08:06 PM Go to last post
  52. Which Correlation is correct?

    Hi there, I'm having a bit of a problem with the last bit of analysis for my thesis. I would like to compare wave exposure of sites along the U.S....

    Started by aesopclimber‎, 08-09-2011 12:00 AM
    • Replies: 1
    • Views: 1,412
    08-09-2011, 12:07 AM Go to last post
  53. 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: 3,140
    10-19-2011, 01:01 PM Go to last post
  54. Sample size calculation

    Hi everyone, I'm a bit of a newbie here. I am trying to determine the appropriate sample size. I have a survey with several dozen questions, most...

    Started by aferim‎, 09-11-2013 04:47 PM
    • Replies: 2
    • Views: 2,805
    09-19-2013, 08:38 AM Go to last post
  55. Post Help in study design! URGENT!

    Suppose I do a retrospective review of patients records of two groups of patients.. one with diagnosis A and the other group with diagnosis B. And I...

    Started by afrasyabkhan‎, 03-08-2009 03:38 AM
    • Replies: 0
    • Views: 2,601
    03-08-2009, 03:38 AM Go to last post
  56. Question Likert scale in SPSS

    Hello, Iíve got an research assignment to do by means of questionnaire. Iíve got some basic info (gender, education level, etc) and then Iíve got 9...

    Started by afronef‎, 12-13-2016 06:49 AM
    • Replies: 1
    • Views: 2,742
    12-13-2016, 08:11 AM Go to last post
  57. t test using diversity index

    So, I am trying to perform a t-test using diversity indexes, but the biostat book I am using is a little bit confusing. the calculated t value =...

    Started by agarcin‎, 07-23-2010 08:49 PM
    • Replies: 0
    • Views: 3,592
    07-23-2010, 08:49 PM Go to last post
  58. Sample size help!!

    Hello! New to the forum but would greatly appreciate any help people may have to offer... Essentially I am trying to organise a scientific study...

    Started by aglove‎, 11-13-2014 03:23 PM
    • Replies: 5
    • Views: 3,065
    11-17-2014, 03:53 PM Go to last post
  59. Reliability/Survival - Where to start?

    General question: I want to examine the reliability/durability of an item that deteriorates every time it is used. Let's say the subject in question...

    Started by agp‎, 02-13-2013 10:48 AM
    • Replies: 0
    • Views: 1,253
    02-13-2013, 10:48 AM Go to last post
  60. Cluster analysis or factor analysis?

    I'm trying to decide which route to proceed for a project I am working on, any input is appreciated. Data: 228 by 10,000 matrix. 114 subjects'...

    Started by agp‎, 02-08-2013 09:25 PM
    • Replies: 1
    • Views: 1,493
    02-09-2013, 12:34 AM Go to last post

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