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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: 18,636
    10-11-2014, 12:02 PM Go to last post
  1. Calculating likelihood for a particular biological sample. Is is possible?

    Hi you all! I've got a problem when trying to analyze some biological data in my PhD. Let's say that I'm interested in performing an analysis...

    Started by EuGENE‎, 09-29-2015 06:42 AM
    biological statistics, likelihood, likelihood ratio test, non parametric
    • Replies: 0
    • Views: 1,006
    09-29-2015, 06:42 AM Go to last post
  2. Why use Chi-square?

    Hi, I am putting together a statistics course about inference techniques to use when the predictor variable(s) are categorical (by which I mean,...

    Started by Eugenie‎, 08-13-2012 09:33 AM
    chi squared, fisher exact test
    • Replies: 9
    • Views: 4,666
    08-15-2012, 01:58 PM Go to last post
  3. Why use Kruskal-Wallis?

    Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

    Started by Eugenie‎, 08-13-2012 09:44 AM
    anova, bootstrapping, kruskal-wallis
    • Replies: 9
    • Views: 7,210
    08-13-2012, 03:14 PM Go to last post
  4. SEM (Structural Equation Modeling)-trimmed model

    Is it okay if I can fix one path between one moderator and another moderator (instead of one path between major variables) to 0 for trimmed model?...

    Started by eunkum‎, 09-13-2012 12:45 PM
    • Replies: 1
    • Views: 1,810
    09-13-2012, 07:06 PM Go to last post
  5. nonparametric test for Two-way repeated measures ANOVA?

    What is a nonparametric test for Two-way repeated measures ANOVA?

    Started by eunkum‎, 11-01-2012 12:14 PM
    • Replies: 0
    • Views: 8,644
    11-01-2012, 12:14 PM Go to last post
  6. Effect size and Significance

    I want to use Students' Treatment Total Score and Control Group Total Score, and measure 'difference between the scores'. And then I want to measure...

    Started by eunkum‎, 11-12-2012 05:49 PM
    • Replies: 0
    • Views: 1,061
    11-12-2012, 05:49 PM Go to last post
  7. multivariate logistic regression

    I want to do multivariate logistic regression. Does it mean "one logistic regression with 2 dependent variables at the same time? Or Does it mean...

    Started by eunkum‎, 04-18-2013 12:02 PM
    • Replies: 5
    • Views: 3,241
    06-16-2013, 01:46 PM Go to last post
  8. time series analysis

    Is time series analysis correlational research? or descriptive research? Please help me!!

    Started by eunkum‎, 04-25-2013 09:23 AM
    • Replies: 0
    • Views: 1,336
    04-25-2013, 09:23 AM Go to last post
  9. Cox Proportional Hazard method survival analysis

    Cox Proportional Hazard method survival analysis is the same as Cox regression analysis?

    Started by eunkum‎, 03-15-2013 03:43 PM
    • Replies: 1
    • Views: 2,472
    03-20-2013, 02:22 PM Go to last post
  10. Durbin-Watson statistics - autocorrelation

    If the Durbin-Watson statistics for the OLS regression was 2.268, does it suggest that there is no autocorrelation among residuals since d is near 2?...

    Started by eunkum‎, 03-21-2013 10:25 AM
    • Replies: 4
    • Views: 3,441
    03-21-2013, 04:01 PM Go to last post
  11. creating a variable

    MY hypothesis is the following: The demographic variable of age has a significant impact on the relationship between organizational trust and the...

    Started by eunkum‎, 03-08-2013 02:56 PM
    • Replies: 1
    • Views: 1,504
    03-09-2013, 02:48 PM Go to last post
  12. Hlm

    I did hierarchical linear modeling. Two variables were not significantly related to the dependent variable at level 1, but I retained them in the...

    Started by eunkum‎, 05-16-2013 10:01 AM
    • Replies: 1
    • Views: 1,108
    05-16-2013, 02:22 PM Go to last post
  13. t-test

    The inpatients infection rates will be tracked from the entire inpatient population on all three adult units allowing it to be compared to the rates...

    Started by eunkum‎, 07-19-2013 10:53 AM
    • Replies: 2
    • Views: 1,287
    07-19-2013, 03:56 PM Go to last post
  14. random effects model

    In Random Effects model, what do Qb and d indicate?

    Started by eunkum‎, 07-11-2013 03:46 PM
    • Replies: 1
    • Views: 1,011
    07-11-2013, 03:50 PM Go to last post
  15. time series

    H1: A correlation exists between agricultural sectors, exports, GDP, and economic growth in Haiti from 1970 through 2010. IV=agricultural sectors...

    Started by eunkum‎, 08-09-2013 03:34 PM
    • Replies: 2
    • Views: 1,505
    08-28-2013, 10:25 AM Go to last post
  16. normal distribution

    I tried three transformations (LG10, SQRT, rank transformation). But I couldn't make the data normally distributed. Could you kindly let me know if...

    Started by eunkum‎, 09-04-2013 05:26 PM
    • Replies: 8
    • Views: 2,056
    09-04-2013, 06:54 PM Go to last post
  17. unidimensionality

    I have six constructs. Each construct has several items. Before we do structural equation modeling, I want to check unidimensionality and convergent...

    Started by eunkum‎, 09-27-2013 10:13 AM
    • Replies: 0
    • Views: 2,023
    09-27-2013, 10:13 AM Go to last post
  18. confirmatory factor analysis

    I did confirmatory factor analysis and wanted to know which item is a high-loading item. One item is significant, but it's path coefficient is...

    Started by eunkum‎, 09-23-2013 05:42 PM
    • Replies: 0
    • Views: 1,470
    09-23-2013, 05:42 PM Go to last post
  19. missing variable

    Items include the scale of 0 (Does not apply or not used) to 3 (Used a great deal). I want to combine several items to make one scale. I assigned a...

    Started by eunkum‎, 12-10-2014 03:14 PM
    missing varible
    • Replies: 0
    • Views: 1,435
    12-10-2014, 03:14 PM Go to last post
  20. noramlization

    I weighted the variables to do structural equation modeling (SEM). I found that some weighted variables were not normally distributed. Do I have to...

    Started by eunkum‎, 01-08-2015 02:06 PM
    normalization
    • Replies: 3
    • Views: 1,495
    01-10-2015, 01:07 AM Go to last post
  21. margin of error

    I have two questions as follows: *Is there a way to apply the margin of error to achieve 99.99% level of confidence? *Can I use the margin of...

    Started by eunkum‎, 04-02-2015 12:13 PM
    statistics
    • Replies: 1
    • Views: 528
    04-02-2015, 12:27 PM Go to last post
  22. stat test

    I want to test the following hypothesis. Which test would be appropriate to test it? H1: The Millennials in YMCA Central Florida score lower in...

    Started by eunkum‎, 07-15-2015 07:42 PM
    • Replies: 1
    • Views: 1,515
    07-18-2015, 12:12 PM Go to last post
  23. Randomised Complete Block Design (RCBD)

    During the cotton-spinning process, a strand of cotton thicker than the final thread is produced, and then twisted before it is wound onto a bobbin....

    Started by eunkum‎, 05-03-2016 01:36 PM
    • Replies: 0
    • Views: 1,073
    05-03-2016, 01:36 PM Go to last post
  24. a completely randomized experimental design and regression

    A company studied the effects of three different methods of promotions on sales of its crackers (labeled as Treatment 1 to 3). Fifteen stores were...

    Started by eunkum‎, 06-02-2016 10:54 AM
    regression
    • Replies: 1
    • Views: 1,728
    06-02-2016, 02:38 PM Go to last post
  25. within subjects factors

    I have two within subjects factors. One variable is fatigue (baseline, fatigue, rest). The other variable is the amplitude of swallowing muscle...

    Started by eunkum1‎, 04-03-2014 04:44 PM
    • Replies: 7
    • Views: 1,431
    04-04-2014, 09:56 PM Go to last post
  26. chi-square

    I need to know if severely (all 52) depressed women more/less likely to commit violent /other crimes. How can I do Chi-Square with Fisher Exact Stat...

    Started by eunkum1‎, 04-10-2014 01:43 PM
    • Replies: 2
    • Views: 1,008
    04-10-2014, 05:09 PM Go to last post
  27. within-subject factor

    RQ: Is there an effect of the number of PEmax maneuvers on EMG amplitude? PEmax(within-subject factor: base, fatigue, rest), EMG amplitude...

    Started by eunkum1‎, 04-17-2014 10:23 AM
    • Replies: 0
    • Views: 874
    04-17-2014, 10:23 AM Go to last post
  28. posthoc test for a within-subject factor

    I am doing MANOVA. I have a within-subject factor "fatigue". One variable is fatigue (baseline, fatigue, rest). One of the dependent variables is the...

    Started by eunkum1‎, 04-15-2014 09:51 AM
    • Replies: 0
    • Views: 940
    04-15-2014, 09:51 AM Go to last post
  29. observed number & expected number

    I did a chi-square analysis. Could you kindly answer the following question? My observed number is the same as my expected number. How can I...

    Started by eunkum1‎, 04-30-2014 03:25 PM
    • Replies: 0
    • Views: 1,195
    04-30-2014, 03:25 PM Go to last post
  30. adj. r-square

    I got a negative adj. r-square. Since the effect size (Adj R-sq=-.016) was low, did it indicate that a time in treatment (the independent variable)...

    Started by eunkum1‎, 05-02-2014 01:20 PM
    • Replies: 8
    • Views: 3,142
    05-02-2014, 05:10 PM Go to last post
  31. factor analysis

    Can I do a factor analysis with one dependent variable and one independent variable? Do I need to have at least two dependent variables to do a...

    Started by eunkum1‎, 07-28-2014 02:23 PM
    • Replies: 5
    • Views: 1,170
    07-29-2014, 09:02 AM Go to last post
  32. Re: what is the best test

    Dear all, I am analysing the data set with two independent variables (syntax, position), two levels each, affecting children's performance on the...

    Started by Eva Edel‎, 07-09-2016 05:45 PM
    • Replies: 1
    • Views: 947
    07-14-2016, 01:08 AM Go to last post
  33. Can relationship be both moderated and mediated?

    Hello....using SPSS I've found that the relationship between my IV and DV is fully mediated (Baron and Kenny) by Med1. I've also found using the...

    Started by eva2‎, 01-17-2011 01:59 PM
    • Replies: 3
    • Views: 3,668
    01-17-2011, 07:35 PM Go to last post
  34. Question Sig diff means - likert scale and multiple variables

    Hi, I have a dataset of 100 survey responses. The survey asked respondents how frequently they engaged in certain leadership behaviours. There...

    Started by evegrace‎, 08-12-2016 09:04 AM
    • Replies: 1
    • Views: 1,116
    08-13-2016, 09:03 AM Go to last post
  35. Assistance with Comparing Two Months of Survey Data

    I'm probably making this harder than it is but I'll ask for opinions anyways. I'm trying to analyze two months of Yes/No survey data. Each month...

    Started by evo8cutie‎, 05-09-2011 08:46 PM
    • Replies: 1
    • Views: 1,947
    05-09-2011, 09:59 PM Go to last post
  36. 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: 2,936
    02-08-2017, 10:34 AM Go to last post
  37. Panel Data Fixed Effects with year dummies

    I wasn't sure quite were to put this thread, so I'm posting here even though it's very similar to another one I posted in another thread. Quick...

    Started by ewalcott‎, 03-19-2013 09:54 AM
    fixed effects, panel data
    • Replies: 0
    • Views: 3,348
    03-19-2013, 09:54 AM Go to last post
  38. Analyzing with heavy skew, transforms not working?

    I have a set with around 200 individuals dealing with cognitive task scores. Most of it is skewed heavily and I'm trying to analyze ideally with a...

    Started by excellrec‎, 05-19-2011 02:25 PM
    • Replies: 7
    • Views: 2,756
    05-24-2011, 06:08 PM Go to last post
  39. trend or forecast

    I have done some research related to computer users and files generating pattern on PC. I collected data from PC where I have information when (date)...

    Started by explorer‎, 10-20-2016 06:37 AM
    data set, prediction model, trend detection
    • Replies: 0
    • Views: 2,080
    10-20-2016, 06:37 AM Go to last post
  40. Comparing 2 groups of means ! shoud I use letters ?

    Hello, I hope everyone is doing well ! when comparing groups of means in a table, usually we express the differences in terms of letters next to...

    Started by expressomar‎, 07-06-2014 10:15 AM
    letters, means, probability
    • Replies: 0
    • Views: 1,390
    07-06-2014, 10:15 AM Go to last post
  41. correlation with missing data

    I got a problem with correlating 2 signals x1,x2 (isgnal in time) with missing data. the missing data is periodic and is in both signals. my...

    Started by eyalenjoi‎, 08-17-2014 05:46 AM
    • Replies: 0
    • Views: 1,424
    08-17-2014, 05:46 AM Go to last post
  42. Advice for a book about Higher Order and Asymptotic Likelihood

    Hi, I'm a bachelor student in statistics. I'm looking for a book about higher order and asymptotic likelihood that is not too complicated and...

    Started by e__‎, 09-14-2015 07:50 AM
    • Replies: 0
    • Views: 795
    09-14-2015, 07:50 AM Go to last post
  43. Comparing the mean of two non-random groups

    Students are assigned to group A or B based on two aspects: a grade from an exam and an evaluation of their teacher. Students with both a high grade...

    Started by f3000‎, 11-10-2013 07:46 AM
    • Replies: 1
    • Views: 1,758
    11-30-2013, 10:59 AM Go to last post
  44. Comparing categorical data with 2 independent variables

    Hi All, I'm a student researcher and am needing some statistical advice. I stumbled upon a post regarding a similar problem at this site, so I'll...

    Started by f344‎, 05-22-2012 09:12 AM
    • Replies: 0
    • Views: 1,401
    05-22-2012, 09:12 AM Go to last post
  45. Dealing with missing values in cluster analysis

    I am currently looking for a cluster algorithm to deal with a large amount of systematically missing values. In particular, I need to cluster...

    Started by fabiangmueller‎, 07-15-2016 05:04 PM
    • Replies: 5
    • Views: 1,146
    07-16-2016, 06:53 AM Go to last post
  46. Effect size for small non-parametric data

    Hi Guys, I would like to run a effect size test for a very small non-parametric analysis (n=4 per group), which one is the most recommended test?...

    Started by fabinha‎, 06-23-2014 09:13 PM
    • Replies: 5
    • Views: 3,094
    06-30-2014, 06:25 PM Go to last post
  47. Terminology for comparing reference questions to answers after a policy change

    Hi, Im conducting a questionnaire in order to examine the behavior of drivers of electric vehicles when providing information, such as parking...

    Started by fader‎, 05-16-2015 05:35 AM
    • Replies: 0
    • Views: 903
    05-16-2015, 05:35 AM Go to last post
  48. Best tool to analyse data

    Hi, I have 20 years of data about calibration reports of various clients which primarily shows three-variables. COMPANY A YEAR 2001 1.)...

    Started by fahm‎, 06-21-2017 05:16 AM
    • Replies: 1
    • Views: 452
    06-21-2017, 10:59 AM Go to last post
  49. predictive analysis algorithm

    Hi, What will be the best algorithms to use in case of predicting a large set of web data. mainly there will be 3 ,4 variables with which i want...

    Started by fajo‎, 05-25-2010 07:57 AM
    • Replies: 0
    • Views: 2,485
    05-25-2010, 07:57 AM Go to last post
  50. Gibbs Point Process

    Does anyone knows what is the aim of using Gibbs marked point process?! I read a paper that used this method to find the best configuration of...

    Started by Faranakf‎, 11-29-2012 05:41 PM
    • Replies: 0
    • Views: 1,013
    11-29-2012, 05:41 PM Go to last post
  51. Agreement between studies- which test is appropriate?

    I'm not using questionnaire. I need to find the agreement between previous studies on the elements of sustainability practice in campus. I'm applying...

    Started by fariha‎, 09-29-2015 02:28 AM
    • Replies: 3
    • Views: 1,313
    10-01-2015, 02:33 AM Go to last post
  52. Confidence interval for N, based on binomial

    Hi all, I've searched the web and these forums but couldn't find a subject that resembled my problem. If I missed something then I'd like to...

    Started by farmer_jim‎, 07-14-2014 03:59 AM
    • Replies: 0
    • Views: 1,282
    07-14-2014, 03:59 AM Go to last post
  53. single function of two gaussian distributed variables..

    Hi Folks, I have a two 2 dimenstional gaussian function of variables x and y and of their respective standard deviations. I have single valued...

    Started by Farzad‎, 03-28-2015 12:48 PM
    • Replies: 3
    • Views: 1,309
    03-29-2015, 05:48 AM Go to last post
  54. Regression Assumption

    Why do you need to meet the homogeneity of regression assumption in ANCOVA? If this assumption violates so what happens?

    Started by fayyazcivil‎, 12-04-2013 04:42 AM
    • Replies: 0
    • Views: 1,504
    12-04-2013, 04:42 AM Go to last post
  55. How to test this research model? With SEM?

    Hey, I am currently writing my master thesis and have gathered all the necessary data and complete my model. 1) Institutional dimension...

    Started by fazzmo‎, 11-21-2012 05:24 AM
    • Replies: 1
    • Views: 1,398
    01-26-2014, 05:45 PM Go to last post
  56. Question Process averages as data points in factorial ANOVA

    (Reposting here, original posted in the "Statistical Consulting" forum) Hello all! Electrical engineer here, currently doing research in...

    Started by fcampelo‎, 10-13-2009 12:49 PM
    • Replies: 1
    • Views: 2,178
    10-13-2009, 09:29 PM Go to last post
  57. Data Groveling

    I am in the market for biomedical assay data that has lower detection limits and preferably be longitudinal. Someone asked me to find some...

    Started by fed1‎, 04-01-2010 06:05 PM
    • Replies: 0
    • Views: 1,836
    04-01-2010, 06:05 PM Go to last post
  58. Maximum number of groups in Kruskal Wallis one-way analysis of variance

    Is there a maximum number of groups in Kruskal Wallis' one-way ANOVA? I am looking at a data set with 42 separate groups and I am unsure if there...

    Started by feignfeign‎, 01-09-2017 11:02 PM
    • Replies: 5
    • Views: 2,835
    01-12-2017, 07:14 PM Go to last post
  59. Why does the following assumptions matter?

    When running an ANOVA we are told that certain assumptions of the test must be present for it to be applicable to the data. I never understood the...

    Started by feignfeign‎, 01-12-2017 07:24 PM
    • Replies: 0
    • Views: 1,781
    01-12-2017, 07:24 PM Go to last post
  60. How to calculate variance on pooled data

    I have an array of pairs. Each pair represents a "bin" in a range. Each pair stores a sum and a count. Data is added to a pair/bin by adding the...

    Started by felixcollins‎, 05-17-2010 11:37 PM
    • Replies: 2
    • Views: 6,022
    05-30-2010, 09:49 PM Go to last post

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