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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: 18,795
    10-11-2014, 12:02 PM Go to last post
  1. descriptive correlational study


    Started by JAR‎, 03-25-2015 12:17 PM
    • Replies: 1
    • Views: 1,227
    03-25-2015, 01:30 PM Go to last post
  2. Design Resolution

    As a matter of definition, do all factorial designs have resolutions? Sometimes, designs have factors in a +/- table in which none of the factors is...

    Started by nits555‎, 02-21-2010 12:17 PM
    • Replies: 0
    • Views: 1,831
    02-21-2010, 12:17 PM Go to last post
  3. Exclamation desperate for some help with a confidence interval question.

    please delete thread

    Started by djani‎, 04-30-2012 08:30 AM
    • Replies: 0
    • Views: 1,563
    04-30-2012, 08:30 AM Go to last post
  4. Desperate urgent help

    Hi everybody, First, let me say how much I appreciate your help here. Its a life saver. I have a presentation tomorrow on my research and I am...

    Started by ruzbayhhi‎, 02-17-2009 07:00 AM
    • Replies: 3
    • Views: 2,715
    02-20-2009, 02:07 AM Go to last post
  5. detect mean and variance shifts

    from the plotted figure, how i can distinguish what i have to monitor mean or variance to detect a shift from the process

    Started by sihem‎, 05-06-2012 03:52 PM
    • Replies: 2
    • Views: 1,604
    05-06-2012, 04:25 PM Go to last post
  6. determening normality in repeated measures ANOVA

    Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

    Started by BBD‎, 01-29-2011 01:47 AM
    • Replies: 6
    • Views: 19,610
    07-19-2011, 05:11 AM Go to last post
  7. Unhappy Determining a new variance

    I am trying to understand a property of ML Estimates, that their distribution is asymptotically normal with covariance matrix inverse of Fisher's...

    Started by justin.sharber‎, 02-19-2011 12:13 AM
    • Replies: 1
    • Views: 2,520
    02-19-2011, 04:30 PM Go to last post
  8. Determining Clustering in Time Series Data

    Dear all, Let me begin by apologising if my question is obvious or rudimentary, I have a very basic knowledge of statistics. I have some time...

    Started by Rss‎, 11-19-2010 07:50 AM
    • Replies: 2
    • Views: 4,130
    11-20-2010, 07:14 PM Go to last post
  9. determining sample size

    Hello everyone, i hope that someone can help me. i'm doing an experiment at my work place. i have 4 vehicles that need to go through the same...

    Started by boris_sht‎, 11-13-2011 07:39 AM
    • Replies: 1
    • Views: 1,846
    11-13-2011, 05:06 PM Go to last post
  10. Determining Sample Size for Quality Audit

    I hope I am posting this to the right section, I really have no idea about statistics. I work for a healthcare company working in residential...

    Started by heathstats‎, 07-11-2014 03:01 AM
    • Replies: 0
    • Views: 2,026
    07-11-2014, 03:01 AM Go to last post
  11. Determining sample size in a factorial repeated measures ANOVA using GPower

    Hi all Can anybody tell me which F-test option in G power is appropriate to find out the sample size for a 2x2x2 repeated measures ANOVA?...

    Started by Jess@Leeds‎, 07-15-2014 11:35 AM
    factorial anova, g-power, power analysis, repeated measures anova, sample size
    • Replies: 0
    • Views: 2,878
    07-15-2014, 11:35 AM Go to last post
  12. Determining Significance Based on Prelimiary Data

    I have conducted a test where I measured the same subjects (n =9, 2 groups) over a period of 8 days. To determine significance between the two groups...

    Started by majixx11‎, 02-26-2012 04:38 PM
    • Replies: 5
    • Views: 1,926
    02-27-2012, 12:58 PM Go to last post
  13. Determining which data set is most like another

    I am new to this forum - so let me apologize in advance if this is the wrong location. Given a specific multivariate data set, and numerous other...

    Started by EMStelley‎, 04-26-2012 12:23 PM
    chi-squared, multivariate data sets
    • Replies: 6
    • Views: 1,757
    04-27-2012, 02:08 PM Go to last post
  14. Smile DF and fishers vs. pearson's

    Hallo everyone I'm having a mental block today, and having trouble getting my df value. So, here's a summary of my data to help: 32...

    Started by drewmac‎, 08-28-2011 07:38 PM
    binomial, chi, degrees of freedom, fisher, pearson
    • Replies: 3
    • Views: 2,638
    08-29-2011, 12:04 PM Go to last post
  15. Red face DF in Repeated Measures ANOVA

    Hi all! :wave: In advance: thank you to all those who take the time to even read this post, as well as answer it: Additional to my sunfish study...

    Started by sms16‎, 02-08-2011 12:23 AM
    degrees of feedom, proc mixed, sas
    • Replies: 0
    • Views: 4,730
    02-08-2011, 12:23 AM Go to last post
  16. Dichotomous data...

    Could you tell me if you can use ANOVAs on dichotomous data (specifically "yes" / "no") responses? If not, what other options do you have if your...

    Started by nogoodatstats‎, 08-20-2009 03:25 PM
    • Replies: 1
    • Views: 4,687
    08-21-2009, 01:41 PM Go to last post
  17. Dickey Fuller Test

    I am studying the Dickey Fuller test. The book of reference is Introductory Econometrics for Finance by C. Brooks. I firstly consider the zero mean...

    Started by zarasandreas‎, 11-24-2011 12:54 PM
    dickey fuller, econometrics, stationarity
    • Replies: 1
    • Views: 3,155
    11-25-2011, 01:49 AM Go to last post
  18. Diebold and Mariano Test

    Hello, I'm currently writing an article about stock return predictability. I have 2 predictive regression models, where I calculated for both the...

    Started by tjeu‎, 04-06-2012 02:24 AM
    • Replies: 1
    • Views: 7,820
    09-18-2015, 01:21 PM Go to last post
  19. Difference between DBLIM and distance-based redundancy analysis???

    Hey there statistical wizards, I have been conducting some statistics using Primer on some ecological data incorporating environmental...

    Started by mycelialgroove‎, 07-17-2011 11:27 AM
    • Replies: 1
    • Views: 4,738
    07-17-2011, 06:07 PM Go to last post
  20. Difference between expected spending and observed spending. What kind of statistical

    I would like some advice from you about what kind of statistical analysis I could do about that data. My case is as follows: According to a...

    Started by pelluzi‎, 05-04-2016 12:02 AM
    anova, chi sq, chi square, f-test, hyposteses testing
    • Replies: 0
    • Views: 2,183
    05-04-2016, 12:02 AM Go to last post
  21. difference between mean ranks

    Hello! I asked respondents to rank 13 motivation factors in order of importance (from the most important to the least important). Now, I would...

    Started by m777k‎, 08-06-2010 07:34 AM
    • Replies: 1
    • Views: 5,642
    08-06-2010, 08:25 AM Go to last post
  22. Difference between samples in terms of frequency ranks

    I have 3 different texts, and for each one of them, I have the frequencies of 25 letters appearing in those texts (Text A, letter A, freq = 5013;...

    Started by NoelAramis‎, 10-07-2015 01:57 AM
    frequency, kruskal-wallis, ranking, ranks
    • Replies: 0
    • Views: 1,299
    10-07-2015, 01:57 AM Go to last post
  23. Difference between two independent proportions

    Hello, I am not a statistician, however, for my latest small research, I would like to test whether there is a difference between two independent...

    Started by Zuzanah‎, 11-07-2016 07:10 AM
    chi-square, proportion test, z-test
    • Replies: 4
    • Views: 4,205
    03-03-2017, 01:48 PM Go to last post
  24. Question Difference between VCV by inverting Hessian at ML and by Hierarchical Bayes

    Let's say we have a multimomial logit problem and we find the best beta coeffcients b* aggregating all units. The inverse of the Hessian at b* gives...

    Started by alik3954‎, 06-10-2014 09:59 AM
    bayesian, bayesian beta regression, bayesian inference, maximum likehood, monte carlo
    • Replies: 0
    • Views: 1,118
    06-10-2014, 09:59 AM Go to last post
  25. Difference in coefficients between regressions?

    Hi - I'm looking for a way to test whether the beta coefficients are significantly different between two regression analyses. For example:...

    Started by dave25‎, 03-19-2009 11:37 PM
    • Replies: 1
    • Views: 10,312
    03-25-2009, 11:55 PM Go to last post
  26. Difference in difference problem.

    Hi. I want to examine the effects of a legislative amendment on limited liability companies. I am using a binary variable as my dependent...

    Started by Kristian Korbu‎, 07-18-2014 09:01 AM
    • Replies: 0
    • Views: 2,105
    07-18-2014, 09:01 AM Go to last post
  27. Difference in mean for compositional data

    How do you test for a different mean between groups in composititions?

    Started by Robert Power‎, 08-14-2014 02:11 PM
    compositional data, compositions
    • Replies: 0
    • Views: 1,098
    08-14-2014, 02:11 PM Go to last post
  28. Difference needed for power in fixed population.

    Hi, I am designing a study to examine the difference made by implementing a new treatment strategy for a medical condition. I have become a...

    Started by schisms‎, 03-23-2011 05:38 AM
    power, significance
    • Replies: 7
    • Views: 3,408
    03-25-2011, 12:34 PM Go to last post
  29. differences between values a meaningful unit (I like cake too)

    Alright I'm still working away on my problem of distance between different types of behavior. I can calculate distances between occurrences and spit...

    Started by trinker‎, 11-02-2012 09:00 PM
    • Replies: 11
    • Views: 2,023
    11-04-2012, 01:01 AM Go to last post
  30. Differences in differences analysis( 2 vs 1 data values)

    Hello I am carrying out a differences in differences analysis for the effects of a treaty agreement on GDP of countries who entered the treaty(...

    Started by stat&data‎, 08-27-2015 03:02 PM
    • Replies: 1
    • Views: 1,812
    09-01-2015, 11:45 AM Go to last post
  31. Differences in responses on a 5 point scale between three groups? Kruskal-Wallis?

    Dear madam/sir, Recently I have designed a course that was run at three different locations. To know what the students thought of the course they...

    Started by blubblub‎, 04-18-2013 06:16 AM
    kruskal-wallis, nominal-ordinal, nonparametric
    • Replies: 2
    • Views: 1,932
    04-18-2013, 05:20 PM Go to last post
  32. different intercept with Multinomial vs Binomial Logistic?

    I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was...

    Started by chipsens‎, 09-06-2011 03:02 PM
    logistic regression
    • Replies: 0
    • Views: 2,700
    09-06-2011, 03:02 PM Go to last post
  33. Different p-values for similar model

    Hello guys, I have a problem related to p-values. here's screen the problem is very high p-value of CPI in model 7, on the other hand CPI in...

    Started by WinstonHuxley‎, 03-31-2014 02:00 PM
    • Replies: 0
    • Views: 1,185
    03-31-2014, 02:00 PM Go to last post
  34. different test for normality

    Hi, Can anybody give a brief description for different non-parametric tests of distributions (like normality)? what are differences between...

    Started by Fred_a‎, 05-04-2013 08:02 PM
    kolmogorov-smirnov, lil, non parametric, shapiro-wilk test
    • Replies: 3
    • Views: 2,292
    05-05-2013, 12:58 PM Go to last post
  35. Difficult forecasting/ density estimation problem in an experimental setting

    Hi everyone, I am researcher conducting a set of economics experiments that are eventually supposed to produce some forecasts for a given player’s...

    Started by whaddup‎, 07-02-2011 04:23 PM
    • Replies: 4
    • Views: 3,219
    07-05-2011, 12:27 PM Go to last post
  36. Question difficulties with finding a suitable research question(s)

    Hello, everyone, :wave: I have an ANOVA-analysis task, and I need to come up with the most suitable research questions for it. the task is as...

    Started by invisibleme‎, 05-03-2013 07:45 AM
    anova, research questions
    • Replies: 4
    • Views: 1,238
    05-03-2013, 08:26 AM Go to last post
  37. Difficulty with Rank-biserial correlation coefficient, N = 5

    Hi there, I am calculating Difficulty with Rank-biserial correlation coefficients in a spreadsheet using the following formula: rb = (2/n)*(Y1...

    Started by BOAZ‎, 01-22-2012 05:59 PM
    rank-biserial correlation
    • Replies: 6
    • Views: 7,864
    01-22-2012, 08:49 PM Go to last post
  38. Dimensionalities in Multi-Dimensional Scaling

    Hello all, :wave: I'm conducting market research and want to use compositional Multi-dimensional scaling to create perceptual maps of Brand...

    Started by JessieB‎, 03-11-2013 08:16 AM
    multi-dimensioanl scaling
    • Replies: 2
    • Views: 1,794
    03-14-2013, 12:49 AM Go to last post
  39. Directional or Non-directional Hypothesis for Independant t-test?

    I am doing a comparative study on the level of depression , anxiety and stress perceived between adolescents (male and females). My sample Size is 60...

    Started by kathmustdie‎, 12-27-2011 12:36 AM
    • Replies: 8
    • Views: 12,428
    12-27-2011, 02:48 PM Go to last post
  40. directional stats: combination of von Mises distributions

    Dear Stats-Experts: I am at loss in my research project and would appreciate any input, reference to literature, publications, etc. Here it goes:...

    Started by tuco‎, 04-18-2012 09:33 PM
    combination, directional statistics, von mises
    • Replies: 0
    • Views: 1,543
    04-18-2012, 09:33 PM Go to last post
  41. Red face Discrete choice experiment - correlation between attributes

    Hi all, am new to this site, so please excuse if I have posted incorrectly. Basically I have designed a discrete choice experiment (DCE)examining the...

    Started by shellbridge‎, 06-15-2013 02:05 PM
    discrete choice
    • Replies: 0
    • Views: 1,393
    06-15-2013, 02:05 PM Go to last post
  42. Discrete distribution with var larger than mean

    Hi, everyone. Is there any statistical distribution (other than binomial) with its variance larger than its mean? Preferably, a distribution which...

    Started by tsukiko‎, 10-29-2011 10:13 PM
    • Replies: 3
    • Views: 7,582
    10-30-2011, 12:41 AM Go to last post
  43. Discrete or Continuous Data and Effect Size

    Dear All, I have a paper with baseline (expressed as median and IQR) and change scores at 12 months (mean, 95%CI) regarding the number of days per...

    Started by Pedro's PhD‎, 07-12-2016 02:47 PM
    • Replies: 0
    • Views: 1,058
    07-12-2016, 02:47 PM Go to last post
  44. Question Discrete time series analysis

    Hello everybody, Well, as student I'm working this last year on my bachelor proof. The subject I'd chosen is discrete (integer) valued time...

    Started by normal_david‎, 04-08-2013 02:01 PM
    discrete, integer, time series
    • Replies: 0
    • Views: 1,688
    04-08-2013, 02:01 PM Go to last post
  45. 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,...

    Started by Dorquemada‎, 01-29-2009 07:01 PM
    • Replies: 6
    • Views: 2,934
    03-02-2009, 12:52 AM Go to last post
  46. discriminant linear analysis, coefficient interpretation

    Hi everyone, I am trying to weigh the effect of two independent variables (age, gender) on a response variable (pass or fail in a Math's test)....

    Started by parsec2011‎, 03-17-2013 09:57 PM
    • Replies: 2
    • Views: 19,421
    03-19-2013, 02:47 PM Go to last post
  47. Discriminant validity issues. Can this be improved?

    Hi, I have some issues with my discriminant validity, as some of the factor variance correlations are greater than the Average Variance Extracted....

    Started by deto4ka‎, 05-04-2013 10:51 AM
    • Replies: 0
    • Views: 1,274
    05-04-2013, 10:51 AM Go to last post
  48. disregard post, need 5 posts to pm someone

    Random stuff to get 5 posts

    Started by Jay Kenyon‎, 12-04-2015 02:22 AM
    • Replies: 2
    • Views: 1,006
    12-04-2015, 02:23 AM Go to last post
  49. Dissemination Research

    Hey Guys/Girls!:D Currently im in the finalizing stage of my master thesis (On gossip versus rumor dissemination on the work floor). Out of a...

    Started by Tim Pigeon‎, 08-04-2013 09:50 AM
    • Replies: 1
    • Views: 1,252
    08-04-2013, 01:44 PM Go to last post
  50. Dissertation confusion!

    Hi there guys, i'm new so hopefully i'll get enough information down here for you, any questions then just ask! Ok so here's the deal... i'm a...

    Started by Swarley‎, 03-06-2009 04:22 PM
    • Replies: 0
    • Views: 2,451
    03-06-2009, 04:22 PM Go to last post
  51. Dissertation statistics

    Hi, I am currently writing my dissertation on long term effects of CEO successions, ie. are there any statistically significant effects on measures...

    Started by estho‎, 07-13-2009 05:21 AM
    • Replies: 0
    • Views: 1,915
    07-13-2009, 05:21 AM Go to last post
  52. Distribution not normal

    Hello, The Shapiro-Wilk test of normality on my data indicates that the distribution is not normal. I have tried to compute the data, but I...

    Started by dissstat1‎, 04-08-2011 08:07 PM
    • Replies: 4
    • Views: 3,329
    04-11-2011, 05:29 PM Go to last post
  53. Distribution of estimator (exponential distribution; truncated at both ends)

    Good day forum, I've been struggling with for a while and would like to hear some thoughts on this one. I've got an exponential distribution,...

    Started by chippy‎, 07-13-2012 07:42 AM
    • Replies: 3
    • Views: 1,691
    11-05-2012, 01:57 PM Go to last post
  54. Distribution of p values

    Hello, I need some help understanding the last stage of a proof. I am trying to understand the proof that say that the distribution of the P...

    Started by NN_STAT‎, 07-30-2012 07:46 AM
    • Replies: 4
    • Views: 5,644
    08-01-2012, 09:11 AM Go to last post
  55. Divergent results - RMANOVA vs. paired samples t-tests

    Hi there, I'm analyzing a dataset (a pre - post intervention), where I have a baseline and 2 post-intervention time points. If I perform a RMANOVA...

    Started by Virconrui‎, 05-15-2012 08:50 AM
    paired samples t-test, repeated measures anova
    • Replies: 0
    • Views: 2,092
    05-15-2012, 08:50 AM Go to last post
  56. Do I have a problem with simultaneity here??

    Hi, I am modelling the demand for imported rice for a sample of countries. The price of imports, one of the explanatory variables, is assumed to...

    Started by KristieK‎, 08-29-2009 07:06 AM
    • Replies: 0
    • Views: 3,324
    08-29-2009, 07:06 AM Go to last post
  57. 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
  58. Do I need separate margins of error?

    I have a question regarding margins of error. I'm looking for correlations between political knowledge and favorability of presidential candidates...

    Started by Husker‎, 10-13-2011 11:01 AM
    • Replies: 0
    • Views: 1,637
    10-13-2011, 11:01 AM Go to last post
  59. 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: 2,900
    03-24-2016, 12:35 PM Go to last post
  60. Poll Poll: do my model considered fit in AMOS?

    Dear all members, I m hereby new members and currently conducting research on organization behavior areas. I need help from all of you. I am very...

    Started by harianto‎, 02-28-2011 02:13 AM
    • Replies: 3
    • Views: 13,366
    08-20-2011, 01:22 AM Go to last post

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