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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: 18,803
    10-11-2014, 12:02 PM Go to last post
  1. Autocorrelated measurements with autocorrelated errors, covariance term

    Dear all interested stats people, I encountered the following situation for error propagation of a time series. 1.) Given a time series...

    Started by FrostR‎, 08-11-2012 07:43 AM
    • Replies: 0
    • Views: 1,510
    08-11-2012, 07:43 AM Go to last post
  2. analysis over all items OR by-subject OR by-items analysis?

    Hi, Let's say you have a data set of for instance 20 subjects who all answered 15 questions. Every question is one items that is either correct...

    Started by fruppel‎, 02-20-2015 08:05 AM
    by-subject by-item
    • Replies: 1
    • Views: 1,594
    02-20-2015, 10:22 AM Go to last post
  3. Question Multiple Imputation of Pre-Composite Scores

    I'm running the analysis on a study that used questionnaires. Several items on the questionnaires can be added to come up with composite scores of a...

    Started by Fulanito de Tal‎, 02-21-2012 10:53 AM
    • Replies: 4
    • Views: 3,269
    03-02-2012, 06:33 PM Go to last post
  4. Question 'Mean location/ spot'

    I have a design that need to have mean of different spots, in simple term it would be like this. P1 shoot 6 and P2 shoot 8 out of 16 neighboring...

    Started by funny4u22001‎, 07-25-2011 12:45 AM
    • Replies: 0
    • Views: 1,671
    07-25-2011, 12:45 AM Go to last post
  5. ANOVA Explanation

    Hey Guys, am not a statistician but came across a publication when researching on cloud computing but have not been able to understand the...

    Started by Future‎, 01-04-2014 09:48 AM
    • Replies: 1
    • Views: 1,135
    01-13-2014, 09:45 AM Go to last post
  6. need help for senior thesis/ NCHA data

    I am doing a senior thesis. I will be using secondary data from the NCHA. I want to see if there are gender differences in abusive relationships....

    Started by futureJDstudent‎, 02-24-2014 06:52 PM
    • Replies: 3
    • Views: 1,511
    02-24-2014, 08:23 PM Go to last post
  7. kaplan-meier from a survival function

    hi, let assume I have a survival function, given as a solution from a continuous model. To be precise, the cumulative hazard is calculated, Ch(t),...

    Started by fuzzyswat‎, 05-11-2012 12:16 PM
    hazard, survival
    • Replies: 0
    • Views: 1,650
    05-11-2012, 12:16 PM Go to last post
  8. exponential EWMA- statistical process control to monitor time between events

    I am looking into control charts to monitor time between events for rare events. A quick literature review revealed that the following four methods...

    Started by F_Vial‎, 02-06-2014 04:10 AM
    exponential, moving average process
    • Replies: 0
    • Views: 1,445
    02-06-2014, 04:10 AM Go to last post
  9. PCA and symmetric distribution.

    Hello, I hope you can clarify my doubts. I'm an Italian student of business administration. For my thesis I study the application of PCA method for...

    Started by g.arcuri88‎, 10-11-2013 04:30 AM
    pca, pca analysis, symmetry
    • Replies: 1
    • Views: 1,730
    10-11-2013, 04:34 PM Go to last post
  10. Panel Data - Pooled OLS vs Fixed Effects vs Random Effects

    Hi forummers, I am a finance PhD student and am currently undertaking some statistical analysis of bankruptcy risk. I have data on roughly 500...

    Started by g1362901‎, 03-26-2009 11:35 AM
    • Replies: 2
    • Views: 79,010
    03-09-2012, 01:54 PM Go to last post
  11. Power Analysis with limited information

    Hi all, I am trying to determine how many groups per cell I need in 8 cells. The study I'm basing the analysis on reports the number of groups per...

    Started by g2007‎, 07-26-2014 05:31 PM
    • Replies: 0
    • Views: 1,038
    07-26-2014, 05:31 PM Go to last post
  12. Goodness of fit for 2D histograms

    Hello all, I've dragging this problem for quite a while now and I'd really appreciate it if someone could help me whit it. I have two sets of...

    Started by Gaba‎, 04-11-2012 07:11 AM
    goodness of fit, histogram, model validation
    • Replies: 0
    • Views: 1,720
    04-11-2012, 07:11 AM Go to last post
  13. Help with multidimensional scaling for multiple DVs

    Hello statistics experts! I couldn't find an answer to my question so I thought that one of you might know: I have 14 risk sources, like nuclear...

    Started by Gabriel N.‎, 01-01-2016 12:26 PM
    clustering, multidimensional scaling, multivariate analysis, vector
    • Replies: 1
    • Views: 1,633
    01-01-2016, 12:39 PM Go to last post
  14. Business Research, Stratified Sampling and Data Analysis - Need Advice

    Dear Forum Members I need some advice on designing a statistical research for my dissertation. I hope I have posted my query in the right section....

    Started by GACL212003‎, 10-03-2012 01:28 AM
    • Replies: 1
    • Views: 1,310
    10-05-2012, 11:30 AM Go to last post
  15. Is ANOSIM appropriate for my question?

    I'm doing a microbial ecology experiment setup as follows: Six barrels have been filled with different substrates. Water from the environment flows...

    Started by gaeborak‎, 02-12-2014 08:15 AM
    • Replies: 0
    • Views: 1,118
    02-12-2014, 08:15 AM Go to last post
  16. Help with multivariate (MCA) analysis graph interpretation

    Hi All, Thanks in advance for any insight you can offer!! Ive been tasked with analyzing possible correlation between various quantitative...

    Started by Gags‎, 01-04-2012 07:18 PM
    • Replies: 1
    • Views: 4,019
    01-06-2012, 07:44 PM Go to last post
  17. Wilcoxon rank sum test on Cross Validation Results

    Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

    Started by gajan‎, 01-30-2012 04:30 AM
    cross validation, wilcoxon rank sum test
    • Replies: 2
    • Views: 2,599
    01-31-2012, 03:33 AM Go to last post
  18. What statistical test do I use to tell if my data statistically significant?

    This is for a PhD experiment I am working on. I have 5 types of rock samples. I am trying to understand how their ability to preserve a type of...

    Started by galaxz‎, 03-27-2015 08:12 PM
    correlations, statistical significance
    • Replies: 0
    • Views: 1,070
    03-27-2015, 08:12 PM Go to last post
  19. Question Test for symmetry? [Please]

    (This was posted in a different sub-section of the forum, but has remained unanswered for over a month. I'm posting it here in the hopes of getting a...

    Started by Gandalf‎, 08-28-2012 12:18 AM
    distribution, non parametric, symmetry, test
    • Replies: 2
    • Views: 1,265
    09-30-2012, 11:35 PM Go to last post
  20. Any stats tests I can run to show inconsistency/ no correlation?

    Hi, I am doing my msc dissertation and I have gathered 204 responses to a questionnaire with one of the main questions being what exercises specific...

    Started by Gards79‎, 06-06-2014 12:11 PM
    • Replies: 6
    • Views: 1,611
    06-06-2014, 06:13 PM Go to last post
  21. transformation of inverse gamma distributed data

    Hi. I have inverse gamma distributed data (Pearson 5 distribution). I've tried some common transformation such as Ln, Lg, sqrt, LnGamma but could not...

    Started by garybooz‎, 02-27-2013 05:18 AM
    • Replies: 7
    • Views: 4,672
    02-27-2013, 08:46 PM Go to last post
  22. Question Identify the causes for a phenomenon

    Hi everyone. I would like to investigate the relationship of different factors to a phenomenon. Saying I have traffic accidents (1 or 0) with...

    Started by garybooz‎, 11-26-2013 08:39 PM
    factors, significance
    • Replies: 0
    • Views: 3,778
    11-26-2013, 08:39 PM Go to last post
  23. Help for Web Log stats on blog site...

    Hello, I have been asked to run an on-going, weekly statistics rankings of topics on a website (blogs). Each blog author lists 'topics', selected...

    Started by gatorpower‎, 11-09-2009 03:27 PM
    • Replies: 1
    • Views: 2,406
    11-10-2009, 03:01 PM Go to last post
  24. Post ICC and Factor scores

    Dear All, I am computing Inter-class correlations (ICC) for a multilevel comparison of geographical areas. I have a long list of indicators and for...

    Started by gav‎, 01-06-2012 08:17 AM
    factor scores, icc, multilevel analysis
    • Replies: 0
    • Views: 2,039
    01-06-2012, 08:17 AM Go to last post
  25. Factor scores to classify groups?

    Hi there, I have carried out a principal component analysis and I would like to use the factor scores to classify 5 groups of respondents. What...

    Started by gav‎, 01-16-2012 10:03 AM
    classification, factor scores, groups, pcp
    • Replies: 0
    • Views: 2,111
    01-16-2012, 10:03 AM Go to last post
  26. Factor analysis question

    Hi, I was hoping somebody might be able to help with a question about factor analysis. Is there a problem with putting three different groups (of...

    Started by GaX‎, 12-30-2013 12:32 PM
    • Replies: 1
    • Views: 1,429
    12-30-2013, 12:42 PM Go to last post
  27. Correlations among responses to a forced-choice scale

    I have data from participants who rate emotional content of pictures. Specifically, people see 20 pictures of abstract paintings (one at a time) and...

    Started by gbarto3‎, 03-29-2013 09:29 PM
    correlation, forced-choice scale
    • Replies: 3
    • Views: 2,249
    04-08-2013, 06:43 PM Go to last post
  28. Request for help on deciding how to analyse some data

    I have a group of students who have data for % Attendance before and % Attendance after These students can be split by various factors, depending...

    Started by gdmorgan‎, 08-25-2011 10:33 AM
    • Replies: 2
    • Views: 2,166
    08-30-2011, 03:02 AM Go to last post
  29. Finding degree of difference

    I am given two sets of data collected by two different people. The data in includes the variables area, production and productivity of coconut. Now,...

    Started by geek‎, 07-09-2015 02:16 AM
    degree of difference, statistical analysis
    • Replies: 2
    • Views: 1,486
    07-10-2015, 01:54 AM Go to last post
  30. Post [ASK] [Quantification Theory Type I] Kansei Engineering Reference

    Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

    Started by Gema‎, 08-23-2014 12:44 AM
    • Replies: 1
    • Views: 3,243
    03-11-2015, 05:17 PM Go to last post
  31. Scetterplot of ZPRED vs. ZRESID in Multiple Regression

    Hi, I was wondering if any could help interpret my scatterplot in terms of homoscedasticity and independence of errors. I can't quite tell whether...

    Started by Gemma12‎, 04-22-2014 12:26 PM
    • Replies: 0
    • Views: 2,890
    04-22-2014, 12:26 PM Go to last post
  32. Exclamation Are scores significantly different to a neutral response? Please help...

    Hello I am working with a likert scale with response ranges from 1-5. A score of '3' indicates a neutral response. I want to calculate whether,...

    Started by gemma7‎, 10-05-2008 07:28 AM
    • Replies: 5
    • Views: 6,521
    10-06-2008, 07:40 PM Go to last post
  33. best presentation of data to aid analysis

    Hello, I need some help with formulating a methodology for my current dissertation. I am investigating the impact of ability setting on students....

    Started by Gemstar‎, 03-12-2009 02:02 AM
    • Replies: 0
    • Views: 2,199
    03-12-2009, 02:02 AM Go to last post
  34. Pearson or Spearman?

    Hello all I know you're supposed to observe a scatterplot first in order to see if the shape is monotonic or linear to determine which test to...

    Started by gene2420‎, 02-18-2014 12:24 PM
    • Replies: 5
    • Views: 1,738
    02-24-2014, 03:06 PM Go to last post
  35. Paired T-Test Debate

    Hey guys! I was having a little debate with a doctor on her study about which statistical test to use. I was always under the assumption that a...

    Started by gene2420‎, 03-06-2014 08:35 PM
    2 Pages
    1 2
    • Replies: 25
    • Views: 10,364
    03-10-2014, 04:12 PM Go to last post
  36. Question How do I determine best choice based on confidence values?

    I have this problem I don't know how to solve. I have X variables. One of them is a key value. I have different data sets, each containing rows of...

    Started by genesis‎, 11-21-2014 12:08 AM
    • Replies: 0
    • Views: 1,403
    11-21-2014, 12:08 AM Go to last post
  37. Correlation analysis Univariate

    Hello fellow, I recently joined the statistical forum, it is time to join as statistical-member to this forum since my carrier progress will be...

    Started by geonass‎, 08-09-2017 08:55 AM
    • Replies: 1
    • Views: 299
    08-10-2017, 08:40 AM Go to last post
  38. Stores and ordered rank of products

    I have data about popularity of some products in some stores. For each of the stores I have only a ordered rank of best-selling products in them. I...

    Started by George P‎, 08-16-2014 12:21 PM
    data analysis, nonparametric statistics, ordered, ranks, test to use
    • Replies: 3
    • Views: 1,325
    08-16-2014, 08:34 PM Go to last post
  39. Comparing likelihood ratios:please help!!!

    Hi to all. I desperately need a method to compare positive and negative likelihood ratios of a diagnostic test within two strata (e.g. likelihood...

    Started by George76‎, 07-13-2009 07:20 PM
    • Replies: 0
    • Views: 2,832
    07-13-2009, 07:20 PM Go to last post
  40. What is the best practice on categorizing free-text survey one-liners?

    Dear all, I am currently analyzing the free-text component of a satisfaction survey using SPSS Text Analytics. A lot of our questions were...

    Started by GeorgeCH‎, 05-23-2013 03:49 AM
    • Replies: 0
    • Views: 1,350
    05-23-2013, 03:49 AM Go to last post
  41. Exclamation Need help selecting appropriate test

    I'm currently trying to select the appropriate significance test and test of association and would really appreciate some help. My independent...

    Started by geosfranklin‎, 02-26-2017 02:38 PM
    chi sq test, ordinal and categorical
    • Replies: 0
    • Views: 1,135
    02-26-2017, 02:38 PM Go to last post
  42. Suggested Forecasting Techniques and execution

    I am doing a research on accident rates (count in relation to total worked hours) in a company and I have the rates for the last 7 years. Each month,...

    Started by geo_11‎, 06-29-2013 01:29 AM
    • Replies: 0
    • Views: 1,459
    06-29-2013, 01:29 AM Go to last post
  43. Is ANOVA applicable? If not what Statistical Tool woud you recommend?

    I am conducting a study to see whether differences exist among different age groups (10 year interval) to serious injuries. As far as I know, in...

    Started by geo_11‎, 08-22-2013 03:24 PM
    • Replies: 4
    • Views: 2,279
    08-23-2013, 12:36 AM Go to last post
  44. Smile Do I have to test normality?

    I have an experiment contains 10 students and 2 experts. I want to test if the average of students evaluation for the 1st question is similar to...

    Started by ger95‎, 03-03-2015 05:11 AM
    • Replies: 2
    • Views: 1,264
    03-03-2015, 11:55 AM Go to last post
  45. Pooling and a posteriori

    Sorry if I am posting this in the wrong forum, administrators feel free to move my thread! I am having some difficulties understanding when to use...

    Started by gerbera‎, 04-16-2013 05:56 AM
    • Replies: 1
    • Views: 969
    04-16-2013, 07:16 AM Go to last post
  46. Generalised Lambda Distribution

    Hello, Can anyone help me, I am trying to use the Generalized Lambda distribution to model some parts in an assembly, but apart from Wikipedia...

    Started by GG1234‎, 10-02-2017 02:47 AM
    generalised, gld, lambda
    • Replies: 7
    • Views: 290
    Yesterday, 03:00 AM Go to last post
  47. Standard error (asymptotic standard error) of ŷi of exponential regression (Y = exp(a

    Hello People I was look a formual or description how to calculate standard error of ŷi or usually called asymptotic standard error in non-linear...

    Started by ggalex‎, 10-23-2008 10:49 AM
    • Replies: 0
    • Views: 25,386
    10-23-2008, 10:49 AM Go to last post
  48. sample size calculation

    I am trying to determine the necessary sample size I need for a study. Standard 80% power and </= 0.05 p value. The study is designed to use two...

    Started by GGarvin‎, 03-05-2015 09:06 PM
    • Replies: 1
    • Views: 2,411
    03-06-2015, 02:47 AM Go to last post
  49. Analysis of Variance.

    Hi all, I have a one question about the analysis of variance. If I have to variables (e.g. A &B) and I want to deal with them as covariate to...

    Started by ghada8888‎, 01-15-2012 04:10 PM
    • Replies: 1
    • Views: 1,861
    02-04-2012, 04:42 PM Go to last post
  50. Testing Research Hypothesis

    Hi All, I would like to ask about the best method to test the hypothesis research. I have 2 ethnic groups (both gender) and I want to know the...

    Started by ghada8888‎, 11-14-2011 12:39 PM
    • Replies: 4
    • Views: 2,825
    11-15-2011, 08:59 AM Go to last post
  51. Homogeneity of Variance

    Hi all, I want to test the Homogeneity of Variance (HV) before conducted MANOVA, and I have to groups (different nationality; Arabs and British)...

    Started by ghada8888‎, 11-22-2011 05:15 PM
    • Replies: 1
    • Views: 1,969
    11-26-2011, 06:46 PM Go to last post
  52. Analysis of Covariance

    Hi everyone, I would like to ask a question about the type of scale (e.g. categorical , continues variable) that should be use as a covariate. I...

    Started by ghada8888‎, 04-10-2012 10:08 AM
    • Replies: 0
    • Views: 1,032
    04-10-2012, 10:08 AM Go to last post
  53. Groups split /Low and High

    HI ALL, I would like to ask about the best and accurate way to dividing groups as low and high. And how I can conducted this analysis using the...

    Started by ghada8888‎, 05-02-2012 09:19 AM
    • Replies: 0
    • Views: 1,065
    05-02-2012, 09:19 AM Go to last post
  54. T-test question

    Hi there. I have one Q need some advice on it. In my research, I have 2 national groups (British and Saudi) and I need to compare between them in...

    Started by ghada8888‎, 11-08-2012 01:24 PM
    • Replies: 7
    • Views: 1,894
    11-28-2012, 11:44 PM Go to last post
  55. Testing Mediation

    Hi All, I have a general question about the Mediation analysis using Hayes Soble test. My Question is : If there is no correlation between path b...

    Started by ghada8888‎, 02-16-2013 02:04 PM
    • Replies: 0
    • Views: 1,216
    02-16-2013, 02:04 PM Go to last post
  56. Correlation and Regression

    Hi all, I have a question about the significant p value in both correlation and regression. Is there any difference between the p values in both...

    Started by ghada8888‎, 04-09-2013 03:51 PM
    • Replies: 4
    • Views: 1,576
    04-10-2013, 02:37 AM Go to last post
  57. Mediation Analysis

    Hi All, Could any one explain for me what is the exact differences between full Mediation and partial Mediation? With some example please. Many...

    Started by ghada8888‎, 04-03-2013 09:22 AM
    • Replies: 2
    • Views: 1,439
    04-03-2013, 11:38 AM Go to last post
  58. Regression

    Hi All, I have a quick question about the correlation before conducting regression. If there was no correlation between x and y, is there any...

    Started by ghada8888‎, 04-12-2013 12:43 PM
    • Replies: 8
    • Views: 1,451
    04-12-2013, 03:12 PM Go to last post
  59. The best predictor in regression analysis

    Hi All, Could any one explain how i can know which is the best predictor in the regression analysis. Example attached. Many thanks, Gh.

    Started by ghada8888‎, 05-09-2013 08:40 AM
    • Replies: 10
    • Views: 3,719
    05-10-2013, 03:35 PM Go to last post
  60. Mediation Analysis

    Hi All, Could any one explain to me the idea around the correlation in the Mediation Analysis (MA)? I have conductedA the Bootstrapping analysis...

    Started by ghada8888‎, 06-09-2013 01:49 AM
    • Replies: 0
    • Views: 1,318
    06-09-2013, 01:49 AM Go to last post

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