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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: 18,790
    10-11-2014, 12:02 PM Go to last post
  1. Probability of Events in Equations

    Hello, This may be an easy question, but I would like to know how to incorporate the probability of an event in a linear (or non linear)...

    Started by mjgarrin‎, 12-09-2016 09:20 AM
    • Replies: 3
    • Views: 3,733
    12-12-2016, 09:48 AM Go to last post
  2. One sample t-test: help needed

    Hi all! I really hope someone will help me out! I want to compare the difference between a single manager's perceptions and customers' perception...

    Started by scrap‎, 11-15-2010 12:30 PM
    • Replies: 8
    • Views: 3,731
    11-22-2010, 08:42 AM Go to last post
  3. Tests for nonnested models (Vuong, Clarke)

    When comparing generalized linear models, do the Vuong and Clarke tests require that the response distributions be the same? For example, could I...

    Started by CappyD‎, 03-12-2011 01:41 PM
    clarke, non-nested, nonnested, vuong
    • Replies: 0
    • Views: 3,731
    03-12-2011, 01:41 PM Go to last post
  4. Little's MCAR test: mismatch in DF

    Hi, I have a question concerning degree of freedom in little ’s MCAR test. There seems to be a mismatch in the degree of freedom in the results of...

    Started by Patrick@RU‎, 06-23-2013 10:01 AM
    little’ s mcar test, missing data
    • Replies: 0
    • Views: 3,731
    06-23-2013, 10:01 AM Go to last post
  5. GLS in MATLAB

    Hi, Can anybody help me to solve a simultaneous equation model with Generalised least square in MATLAB?

    Started by poulamibhattacharjee‎, 11-15-2012 03:12 AM
    • Replies: 0
    • Views: 3,719
    11-15-2012, 03:12 AM Go to last post
  6. 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: 3,716
    05-10-2013, 03:35 PM Go to last post
  7. MLE for correlation (not covariance) matrix?

    Is there an efficient way to estimate the correlation matrix for the D-dimensional r.v. \mathcal X = (\mathcal X_1, \ldots, \mathcal X_D) under the...

    Started by Daniel Dvorkin‎, 02-08-2013 10:06 AM
    • Replies: 4
    • Views: 3,714
    02-08-2013, 11:33 AM Go to last post
  8. Advice on predictive modelling/forecasting

    Hi - I am looking for some advice on predictive forecasting. I will be taking measurements of power grid frequency data. These will all be within...

    Started by scothoward‎, 01-19-2011 08:28 AM
    • Replies: 1
    • Views: 3,713
    01-24-2011, 07:51 AM Go to last post
  9. Canonical Discriminant analysis.

    Hi everyone :) I am new here. May be my query is too easy for you people but I have no idea how to do that. :confused: :( .Please help me. So my...

    Started by sristi‎, 03-06-2013 02:51 AM
    • Replies: 3
    • Views: 3,708
    03-19-2013, 02:54 PM Go to last post
  10. [help]interpretation needed please

    How would you interpret the regression result is good or not?> How would you interpret coefficient and ? Would you reject the hypothesis that...

    Started by numerospy‎, 11-15-2013 10:28 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 3,707
    11-20-2013, 02:43 AM Go to last post
  11. which statistical test to use - Observed difference in outcome is due to chance?

    Hi, I have results from two very sensitive but different lab test trying to find pathogen in a patient sample. For some patients, results from two...

    Started by deepbiomed‎, 11-03-2016 08:49 PM
    • Replies: 12
    • Views: 3,706
    11-06-2016, 08:07 PM Go to last post
  12. Tricky(?) sampling problem

    Hello all! I have a survey data set consisting of interview answers of different people. The people have been sampled with simple random sampling....

    Started by kmh‎, 09-26-2009 03:27 AM
    • Replies: 3
    • Views: 3,690
    09-27-2009, 02:33 PM Go to last post
  13. Thumbs up Research Ethics

    If allowed, should animal research be limited to research that investigates cures for terminal illnesses, or should they continue to be used in any...

    Started by meshelle‎, 01-13-2012 12:57 PM
    • Replies: 13
    • Views: 3,689
    01-23-2012, 09:06 PM Go to last post
  14. comparison of Exponential distribution and Lognormal Distribution parameters

    Hi everyone! I have 30 days worth of data. Each day, I have a set of interarrival times. I wanted to find out the distribution of the arrivals, so...

    Started by whattodo‎, 05-29-2012 07:07 AM
    • Replies: 0
    • Views: 3,687
    05-29-2012, 07:07 AM Go to last post
  15. I.I.D assumption of T-test

    I am writing my second master's thesis now and I came across a situation where V\neq{V}. So I thought I'd test whether this need to be the case in...

    Started by Englund‎, 01-14-2014 03:40 PM
    • Replies: 10
    • Views: 3,685
    01-16-2014, 02:29 PM Go to last post
  16. Comparing means from SAME sample

    I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

    Started by HumanParticipantResearch‎, 09-01-2010 01:35 PM
    • Replies: 0
    • Views: 3,684
    09-01-2010, 01:35 PM Go to last post
  17. Cronbach's alpha

    Help please! What data do I need to work out the cronbach alpha coefficient? I have 30 responses to a large number of Likert-type questions. We want...

    Started by ljsimkcd‎, 10-12-2011 08:10 AM
    • Replies: 5
    • Views: 3,684
    10-14-2011, 05:01 AM Go to last post
  18. Which statistical test shall I use please? Thanks a lot

    Hi I am trying to compare 2 groups- one that has had surgery on the same leg (37) vs opposite leg (48) and to compare whether there is any...

    Started by saral123123‎, 12-28-2016 04:08 PM
    • Replies: 3
    • Views: 3,681
    12-29-2016, 08:42 AM Go to last post
  19. which correlation for a PCA?

    I have data that has both discreet and continuous variables and, that are highly variable, not entirely independent of each other and some aren't...

    Started by madhatter‎, 05-08-2009 05:11 AM
    • Replies: 0
    • Views: 3,677
    05-08-2009, 05:11 AM Go to last post
  20. Power calculation with measurement error on Y

    I'm trying to do a power calculation for a study I'm involved in, and I'm a bit stuck. The study is about textual cues of trust. We want to...

    Started by Junes‎, 11-01-2016 07:22 AM
    measurement error, multicolinearity, power
    • Replies: 12
    • Views: 3,676
    11-01-2016, 07:02 PM Go to last post
  21. Checking if Critical Point Max or Min or Saddle

    How can I check if a critical point (x1,x2,...x10) for a function of 10 variables is a minimum or maximum or saddle? There is a lot of...

    Started by Valen‎, 02-04-2011 05:42 PM
    • Replies: 0
    • Views: 3,672
    02-04-2011, 05:42 PM Go to last post
  22. Wilk s theorem and LR test

    Hello, I have first posted the following in the "Statistics help" section, but it might be that it is better to post it here. I have some...

    Started by Arkonis‎, 03-22-2012 11:19 AM
    • Replies: 2
    • Views: 3,672
    03-30-2012, 09:56 AM Go to last post
  23. How to Adjust Frequency Table Range

    I have a set of data and am trying to find the best ranges to create a frequency table/chart. As I change the first interval, the frequency table...

    Started by therichard‎, 04-14-2011 10:15 AM
    • Replies: 0
    • Views: 3,671
    04-14-2011, 10:15 AM Go to last post
  24. A Soccer/Football Ratings System - Home Advantage

    Hi guys, this is my first post. (So do lower your expectations) I'm currently writing a thesis that deal with sports probabilities and part of the...

    Started by chrishello92‎, 09-02-2015 12:48 AM
    • Replies: 2
    • Views: 3,671
    09-02-2015, 03:42 AM Go to last post
  25. How to find out the specific association of a particular age bracket to a particular

    If I have a table (mXn) that contains the rows of age brackets (like 25-35 years, 35-45 years, 46-60 years) and three columns of low stress, medium...

    Started by Dr.Appalayya‎, 04-06-2010 03:54 AM
    • Replies: 7
    • Views: 3,665
    04-10-2010, 10:15 AM Go to last post
  26. Sample size...

    have found numerous on-line calculators and have read through some forum postings but am now more confused than ever. I have been asked to...

    Started by mysterymouse‎, 05-19-2009 11:43 PM
    • Replies: 1
    • Views: 3,654
    05-20-2009, 09:13 AM Go to last post
  27. The gumball analogy - research advice please.


    Started by screamingforanewday‎, 10-28-2011 08:45 PM
    • Replies: 1
    • Views: 3,654
    10-29-2011, 12:19 AM Go to last post
  28. power analysis for parameter estimation of a gamma distribution?

    How do I calculate the needed sample size to determine if the parameter estimates are accurate enough for a gamma distribution? Thanks.

    Started by manoa‎, 08-03-2011 09:23 PM
    • Replies: 10
    • Views: 3,653
    08-04-2011, 05:30 PM Go to last post
  29. Modeling traffic according to a distribution.

    Hello everybody! I'm new in this forum and I hope this is the right place to post this thread.. I'd like to kindly ask you just a suggestion to...

    Started by smoking81‎, 06-19-2008 02:44 AM
    • Replies: 6
    • Views: 3,652
    06-27-2008, 05:47 AM Go to last post
  30. paired or unpaired T-Test or even some other test?

    Hello there, I am trying to help out some students of medicine who are writing at their phd-thesis in germany. they have data from several...

    Started by Kullukschan‎, 09-14-2011 11:50 AM
    • Replies: 7
    • Views: 3,651
    09-14-2011, 07:18 PM Go to last post
  31. number of distinct samples in sampling with replacement

    If I have a set (X1, X2,X3) and I want to re-sample them with replacement, the possible combinations of the samples are (the order doesn't matter):...

    Started by zzzc‎, 02-01-2011 06:58 PM
    • Replies: 0
    • Views: 3,650
    02-01-2011, 06:58 PM Go to last post
  32. non-parametric equivalent for mixed-factorial design

    I have to analyze my confidence data which is measured using a likert scale (1 – 7). Because it’s ordinal in nature, I need to use non-parametric...

    Started by gradstudent87‎, 04-27-2011 04:12 PM
    • Replies: 2
    • Views: 3,648
    04-27-2011, 11:13 PM Go to last post
  33. Which test to use / Spearman's Rank Order correlation

    I am trying to find a relationship between two firm performance scores - how board diversity score (independent variable) affects companies' social...

    Started by jamai‎, 08-14-2012 05:56 AM
    • Replies: 2
    • Views: 3,647
    08-14-2012, 09:31 AM Go to last post
  34. Logistic regresion with only discrete IV

    Hi, I saw a few binary logistic regressions in Minitab where we did not have any continuous variables and the analysis Minitab gave was simply the...

    Started by rogojel‎, 08-02-2013 06:48 AM
    • Replies: 5
    • Views: 3,647
    08-03-2013, 02:29 PM Go to last post
  35. Testing Standard deviations for repeated measures design

    Hi, I need to do a within subject test of standard deviations. I have 14 people and 4 groups of standard deviations. We want to see if there is any...

    Started by katikarp‎, 07-21-2011 12:19 PM
    • Replies: 5
    • Views: 3,645
    07-21-2011, 02:16 PM Go to last post
  36. Multinomial Logistic Regression

    Does anyone knows how I can formulate a the link function of a multinomial logistic regression without using a base class teotjunk

    Started by teotjunk‎, 05-05-2010 06:12 AM
    • Replies: 2
    • Views: 3,640
    05-07-2010, 05:57 PM Go to last post
  37. NOOB questions about Mancova, Ancova and multiple regression

    I'm a beginning grad student and having a tough time understanding how test results determine if there is reliability and validity. In the study...

    Started by julieo00‎, 12-01-2011 03:34 AM
    • Replies: 3
    • Views: 3,634
    12-02-2011, 09:58 AM Go to last post
  38. finding data trends

    I have a dataset that includes four replicates of 7 different concentrations of pesticides applied to a plant. After exposure the number of offshoots...

    Started by studentmile‎, 11-02-2008 01:20 PM
    • Replies: 2
    • Views: 3,631
    11-16-2008, 03:31 AM Go to last post
  39. High Correlations with Very Different Distributions..?

    I am comparing a similar calculation for the same sample via two different methods. My goal is to show that the second measure offers more rich /...

    Started by american_rob‎, 07-08-2008 02:46 PM
    • Replies: 4
    • Views: 3,628
    07-14-2008, 09:59 PM Go to last post
  40. Regression on Binned data

    Hi, Can I carry out linear regression reliably with binned data. IE. data on cases falling into a series of ranges over time. I can imagine...

    Started by Cox‎, 11-30-2009 09:38 AM
    • Replies: 0
    • Views: 3,626
    11-30-2009, 09:38 AM Go to last post
  41. Multivariate analysis - help

    Hi, I'm looking at place of death in a group of people, I have information on where they died, what they died of, their ethnicity, the area of...

    Started by tje257‎, 05-28-2010 05:02 AM
    • Replies: 4
    • Views: 3,619
    05-30-2015, 05:37 AM Go to last post
  42. Event study t-test help

    Hi, Im doing a report about clinical trials and abnormal effect returns on the stock market. I have collected 7 events with an eventwindow of -5...

    Started by Patark‎, 05-04-2011 03:14 PM
    • Replies: 0
    • Views: 3,619
    05-04-2011, 03:14 PM Go to last post
  43. Statistical test for two Maxwell-Boltzmann distributions

    Suppose we have two processes A and B, and N subjects, x_i. A(x) is distributed as a Maxwell-Boltzmann distribution with scale parameter alpha_a;...

    Started by xygorn‎, 04-12-2011 10:57 AM
    maxwell-boltzmann, scale parameter, statistical test
    • Replies: 2
    • Views: 3,618
    04-12-2011, 01:10 PM Go to last post
  44. Smile Correlational stusy, Conformity and Intelligence

    Im doing a research correlation between Confirmity and Intelligence. Got 60 sample size. All participants where given 2 tests to fill up, Approval...

    Started by Psychonaut‎, 12-26-2011 02:36 AM
    correlational study help
    • Replies: 5
    • Views: 3,614
    12-29-2011, 07:51 PM Go to last post
  45. Red face Convergent and Divergent Validity

    Is it possible to make a multimethod-multitrait matrix of tests with different number of items? example: Test 1 consists of 5 categories with 24...

    Started by mae‎, 03-05-2012 10:07 AM
    • Replies: 7
    • Views: 3,612
    03-06-2012, 10:30 AM Go to last post
  46. 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: 3,611
    10-15-2011, 07:30 PM Go to last post
  47. EM algorithm

    Hello can you help me? I require a program for estimate of parameters in density of mixture exponential With EM algorithm . Thank you for your...

    Started by elnaz‎, 04-09-2006 03:44 PM
    • Replies: 0
    • Views: 3,608
    04-09-2006, 03:44 PM Go to last post
  48. Unhappy Choosing an appropriate Statistical Test

    Hi All, I'm new here - just wanted to ask you which statistical test I could use for the following case (thanks in advance!): Information: ...

    Started by uzymedphys‎, 08-14-2010 03:39 AM
    • Replies: 3
    • Views: 3,605
    12-06-2010, 11:36 PM Go to last post
  49. Propensity score matching - pre-treatment outcome variable

    Hi all, maybe this rather a silly question but I have not found anything helpful. I have two groups of samples which are basically a treatment and...

    Started by Chickencheese‎, 11-19-2016 08:14 AM
    control, matching, propensity score matching
    • Replies: 5
    • Views: 3,602
    12-05-2016, 03:20 PM Go to last post
  50. choosing basic test: logistic regression or multiple chi square?

    -------------------------------------------------------------------------------- Hi, I'm new to statistics and am working on a project for...

    Started by Chris Webber‎, 06-22-2009 10:41 AM
    • Replies: 0
    • Views: 3,601
    06-22-2009, 10:41 AM Go to last post
  51. Arrow transformation response and predictors

    How to find the proper transformation of the response or predictors ? Is it simply to identify from the diagmostic plot ? Usually I apply...

    Started by purple‎, 11-03-2010 01:48 PM
    • Replies: 1
    • Views: 3,599
    11-03-2010, 03:08 PM Go to last post
  52. Inter rater reliability

    I'm hoping someone might be able to help me figure out how best to analyse the data I have. For my research, subjects each create 3 small image...

    Started by willpy‎, 11-10-2010 11:45 AM
    • Replies: 0
    • Views: 3,599
    11-10-2010, 11:45 AM Go to last post
  53. Rasch Analysis

    Hello all, someone asked me to look into Rasch Analysis. I have found a few articles that I am going to read but I was just curious if anybody is...

    Started by lancearmstrong1313‎, 11-20-2012 07:05 AM
    • Replies: 4
    • Views: 3,599
    02-23-2016, 12:09 PM Go to last post
  54. Question What is the technique of analyzing pooled cross sectional data?

    Like the title suggests, I have a data set that comprise of several cross sectional waves. The subjects in each wave are different, just to be clear....

    Started by non-sleeper‎, 03-28-2011 02:15 AM
    • Replies: 0
    • Views: 3,596
    03-28-2011, 02:15 AM Go to last post
  55. Question Scientific Theories

    When evaluating a theory, which of these criteria do you think is the most important, the least important, and why? Do all of these criteria need to...

    Started by misty‎, 01-17-2012 07:42 PM
    • Replies: 9
    • Views: 3,592
    01-19-2012, 02:40 PM Go to last post
  56. Question Problems for ordinary least squares and ridge solutions

    I am confused with these two methods. Fox example, Suppose p ≫ n (many more predictor variables than observations), I have a design matrix X and...

    Started by tx1988‎, 03-16-2010 01:27 AM
    • Replies: 1
    • Views: 3,588
    03-16-2010, 01:51 AM Go to last post
  57. Categorical data goodness of fit question

    Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion...

    Started by szm‎, 02-21-2012 04:12 PM
    categorical data analysis, chi square, deviance, genmod, log linear
    • Replies: 6
    • Views: 3,588
    02-21-2012, 06:20 PM Go to last post
  58. Using Mann-Whitney U?

    Hi, I'm confused about which statistic to use. I want to find out if a law in two different states influences service delivery (get referral/ do...

    Started by picaritos‎, 08-21-2012 11:22 AM
    • Replies: 10
    • Views: 3,582
    08-27-2012, 03:56 PM Go to last post
  59. Randomization in an experiment

    Hi, everyone. I know randomization is basically to help guarantee that the experiment at hand doesn't systematically favor any condition over...

    Started by cowmoose‎, 01-19-2009 12:19 AM
    • Replies: 0
    • Views: 3,578
    01-19-2009, 12:19 AM Go to last post
  60. Bivariate Contour Ellipse Area

    I have found a research paper, where there is need to calculate the area of a bivariate contour ellipse. I am familiar with drawing a confidence...

    Started by m1chael‎, 07-21-2016 07:25 AM
    • Replies: 0
    • Views: 3,576
    07-21-2016, 07:25 AM Go to last post

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