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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: 18,737
    10-11-2014, 12:02 PM Go to last post
  1. General vs Generalized Linear Models

    While defending my thesis yesterday, this difference was pointed out. Surprised that there was actually a difference I wasn't aware of, I've looked...

    Started by Link‎, 03-09-2011 01:51 PM
    • Replies: 12
    • Views: 13,652
    06-23-2015, 12:52 PM Go to last post
  2. 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: 6
    • Views: 247
    10-17-2017, 01:33 PM Go to last post
  3. Generalized estimating equations and multiple imputation

    Hi, I'm running a Generalized estimating equation model with multiple imputed data but I can not get a pooled outcome. Do anyone have a solution to...

    Started by Ulrik‎, 10-29-2014 03:54 AM
    gee multiple imputation
    • Replies: 4
    • Views: 2,994
    10-29-2014, 03:06 PM Go to last post
  4. Generalized Estimation Equations

    Dear all, I have a data set with three independent variables and one dependent variables. Two independent variables are factors with several...

    Started by Wilbert‎, 08-23-2013 04:01 AM
    • Replies: 0
    • Views: 1,002
    08-23-2013, 04:01 AM Go to last post
  5. generate constrained combinations

    I have some vectors like this V1= V2= V3= V4= I would like to get all possible combinations from these vectors that look like this ,V2,V3,v4]...

    Started by kjohn‎, 11-05-2014 05:14 PM
    combinations, constraints
    • Replies: 0
    • Views: 2,319
    11-05-2014, 05:14 PM Go to last post
  6. Generate Data for Correlated Continuous and Discrete variables

    Hi I was wondering if anybody could suggest an appropriate approach for the following... I have one independent variable, X, which takes the...

    Started by sammyj‎, 11-10-2011 07:15 AM
    correlation, multivariate, probit, simulated_data, simulation
    • Replies: 5
    • Views: 4,084
    11-11-2011, 02:29 PM Go to last post
  7. generate data for logistic regression simple question

    Hi there, If I want to see how good can I estimate the coefs in the simple linear model y=b0+b1*x+e when X follows exponential with mean 3 (or...

    Started by leo nidas‎, 08-28-2008 12:55 PM
    • Replies: 1
    • Views: 4,414
    08-28-2008, 03:19 PM Go to last post
  8. generate overdispersed poisson data

    Hi there, Can anyone tell me how to produce overdispersed poisson data? An algorithm or something? I find it difficult. Thanx in advance for...

    Started by leo nidas‎, 06-17-2009 08:53 AM
    • Replies: 5
    • Views: 7,144
    06-19-2009, 03:17 AM Go to last post
  9. Generate Space Filling Designs with nonlinear constraints on the design space

    Hey everybody, thanks for taking the time to view my post. I was wondering if anyone knows of any software that will allow a user to create a...

    Started by TSGarp007‎, 07-08-2013 08:32 AM
    • Replies: 0
    • Views: 792
    07-08-2013, 08:32 AM Go to last post
  10. Generating a multi-parameter space and sampling from it

    Hi all, I have a long list of combination of parameters which covary. I would like to sample from it but not exactly the same values. What I'd like...

    Started by Oritteropus‎, 06-01-2013 11:49 AM
    covariation, parameter space, sampling
    • Replies: 0
    • Views: 1,265
    06-01-2013, 11:49 AM Go to last post
  11. Generating Beta binomial random variables

    Hi, I am looking for the theoretical method/algorithms to generate beta-binomial random variables. I would like to kindly request you to suggest...

    Started by arun‎, 11-19-2012 10:17 AM
    beta binomial, generation
    • Replies: 0
    • Views: 1,195
    11-19-2012, 10:17 AM Go to last post
  12. Generating correlated binary data

    Suppose I have a column of random binary numbers. I would like to find a way to generate a second column with the same number of cases that has a...

    Started by JEHP1846‎, 03-19-2010 04:49 PM
    • Replies: 2
    • Views: 3,417
    03-19-2010, 06:31 PM Go to last post
  13. Generating Skewed Normal Distributions

    I want to generate Random Normal Distributions with specific degrees of Skewness and Kurtosis. So far I have looked at the following two approaches:...

    Started by kanny_g‎, 02-04-2009 04:33 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 42,370
    06-03-2016, 10:10 PM Go to last post
  14. Genes comparison in SPSS

    Hey guys, I have an excel sheet I imported to SPSS all the rows are genes (over 3200), and for each gene I have its expression level in 6...

    Started by XPeriment‎, 06-18-2016 11:30 PM
    • Replies: 1
    • Views: 1,307
    06-19-2016, 03:38 AM Go to last post
  15. geometric argument for constraints on r_xz given r_xy and r_yz

    Today a labmate asked the following question: if we have three random variables x, y, z, and we know the correlations r_{xy} and r_{yz}, what...

    Started by Jake‎, 09-17-2013 01:17 AM
    • Replies: 5
    • Views: 4,057
    05-18-2015, 04:16 PM Go to last post
  16. Getting desperate, please help!

    I have a research project and I am really confused on what I should do with the data. I asked people to complete a survey. The survey had 10...

    Started by blueirony‎, 04-28-2011 06:20 AM
    • Replies: 1
    • Views: 1,586
    04-29-2011, 04:26 PM Go to last post
  17. 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: 1,020
    11-29-2012, 05:41 PM Go to last post
  18. Gibbs sampler problems

    I am trying to implement the gibbs sampler found here http://www.people.fas.harvard.edu/~plam/teaching/methods/mcmc/mcmc.pdf on page 175. It is...

    Started by aminnaar‎, 07-23-2013 12:08 PM
    gibbs sampler, python
    • Replies: 1
    • Views: 1,643
    07-23-2013, 12:46 PM Go to last post
  19. GIS data questions

    Hi All, I have to get some GIS data for a project I am working on but I honestly have no idea where to start. What I need is as follows: 1. I...

    Started by Lazar‎, 06-17-2015 08:09 PM
    • Replies: 5
    • Views: 1,061
    06-18-2015, 11:21 AM Go to last post
  20. Giving statistical significance to the max value of a vector

    Hi, I have many samples, each sample is a vector with n elements. Each element represents a state, and the value in a cell is how likely this...

    Started by danny‎, 10-23-2012 03:11 AM
    • Replies: 4
    • Views: 1,941
    10-29-2012, 11:32 AM Go to last post
  21. GLM on bimodal Data possible?

    Hello, I've got data, in which the target variable is bimodally distributed. The target variable is also bimodally distributed conditional on the...

    Started by consuli1‎, 04-29-2014 03:57 PM
    • Replies: 0
    • Views: 2,468
    04-29-2014, 03:57 PM Go to last post
  22. GLMM - fitting random effects to a complex field design

    Dear forum users, I’d be very grateful to hear about any opinions on a problem I’m having with the random effects side of my generalised linear...

    Started by Mark Kusk‎, 08-02-2014 08:10 AM
    • Replies: 6
    • Views: 2,110
    08-03-2014, 05:07 AM Go to last post
  23. 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: 3,709
    11-15-2012, 03:12 AM Go to last post
  24. Exclamation God you people are clever!

    Hi, :wave: I'm collecting data from a single group of 15 participants showing their improvement in a 5 stage levelled test before and after an...

    Started by help me!‎, 01-05-2010 02:30 PM
    • Replies: 5
    • Views: 5,054
    05-08-2010, 12:52 AM Go to last post
  25. GOF / Diagnostics for a GLM Binomial-Logit Family Model STATA

    Hello, I am using a GLM Binomial-Logit Family Model. I am using this model because my dependent variable is a proportion. Having carried out the...

    Started by Alicia2010‎, 05-20-2010 03:59 AM
    • Replies: 0
    • Views: 4,174
    05-20-2010, 03:59 AM Go to last post
  26. GOF Analysis/Discussion

    What actions constitute an analysis of goodness-of-fit for a regression model? What are the typical graphical displays used in this analysis of...

    Started by shane414‎, 04-14-2017 02:54 AM
    regression analysis
    • Replies: 1
    • Views: 732
    04-14-2017, 10:33 AM Go to last post
  27. GOF measures

    When we validate a statistical model, should we only consider the traditional Goodness-Of-Fit measures? Are there other ways in which the model...

    Started by shane414‎, 04-14-2017 03:09 AM
    • Replies: 1
    • Views: 689
    04-14-2017, 10:48 AM Go to last post
  28. Good Book on Mathematical Statistics

    I'm a mostly self-trained analyst with degrees in the social sciences but not in statistics. I'm looking to improve my knowledge of the mathematics...

    Started by elanmorin‎, 08-27-2014 03:08 PM
    • Replies: 9
    • Views: 2,716
    09-17-2014, 07:09 AM Go to last post
  29. Good sources (books, articles, ....) on the history of Monte Carlo methods?

    I am finally entering the final step of my PhD. Chapter 1 of my dissertation has already been published, Chapter 2 has been submitted for publication...

    Started by spunky‎, 07-21-2016 02:54 PM
    monte carlo, multivariate
    • Replies: 4
    • Views: 2,462
    07-22-2016, 05:38 AM Go to last post
  30. Goodness of Fit Applicability

    I'm Looking for some advice on comparing the results of two different sampling methods (sampling the same population) against each other. The two...

    Started by Archoplites‎, 02-13-2013 02:49 PM
    • Replies: 2
    • Views: 1,231
    02-13-2013, 05:09 PM Go to last post
  31. 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: 1,714
    04-11-2012, 07:11 AM Go to last post
  32. Goodness of fit test for categorical data with non-negative real numbersca

    An experiment that I conduct has 5 outcomes: A, B, C and D. I conduct 12 trials for this experiment. I observe, for example: Outcome : Frequency...

    Started by bakwas‎, 06-30-2016 09:48 AM
    categorical data, chi-square test, fishers exact, goodness-of-fit, model comparison
    • Replies: 2
    • Views: 1,510
    07-14-2016, 01:13 AM Go to last post
  33. Gpower

    I'm wanting to run a study where I record motor evoked potentials evoked from a group of participants they view images of people performing reach and...

    Started by _Craig_‎, 09-23-2009 01:15 PM
    • Replies: 2
    • Views: 5,108
    01-11-2011, 08:28 AM Go to last post
  34. Grade (A, A-, B+, B, B-....)

    Im planning to do run some correlation and different groups stat test on my data. In my all scenarios, Grade is a dependent variable. So, my question...

    Started by studentdoctor‎, 03-16-2011 12:55 PM
    • Replies: 2
    • Views: 3,191
    04-11-2011, 06:32 AM Go to last post
  35. Graduates grades- how to standardize by subject?

    Hello! This is probably rather basic, but I'd appreciate any input. The sample: I have survey responses from a sample of about 4000 German...

    Started by siskin‎, 08-23-2011 07:43 AM
    • Replies: 2
    • Views: 2,318
    08-30-2011, 03:00 AM Go to last post
  36. Granger Causality test help!

    I have run a Granger causality test on two time series but im not sure based on the output whether or not to reject the null hypothesis. Below is the...

    Started by ross781‎, 02-21-2009 01:38 PM
    • Replies: 0
    • Views: 5,263
    02-21-2009, 01:38 PM Go to last post
  37. Graphical Method of Testing Cox Regression Model Fit

    Hi all, Since my last post you'll be happy to know i have successfully built a couple of what appear to be reasonable proportional hazard models...

    Started by Cope_LA2‎, 06-17-2015 10:58 AM
    • Replies: 0
    • Views: 960
    06-17-2015, 10:58 AM Go to last post
  38. Greatly unbalanced sizes of samples for Mann-Whitney U test.

    Hello, I want to compare two independent samples and by doing a little research I have concluded that the Mann-Whitney U test is the most...

    Started by LauraS‎, 12-01-2010 12:00 PM
    • Replies: 1
    • Views: 6,883
    12-02-2010, 05:55 AM Go to last post
  39. Grou x Time interactions

    Hi, I conducted in my clinical trial a mixed anova with repeated measures. What can I conclude if I find significant interactions Group x Time and...

    Started by pcastro‎, 01-09-2011 08:29 PM
    • Replies: 2
    • Views: 11,831
    01-10-2011, 05:26 AM Go to last post
  40. grouing variable,likertscale firm,performance,multvariate analysis

    My research is aim to investigate the mechanisms through which IT influence sustainability of competitive advantage. The data is collected through...

    Started by Anwar Shamamseldinn‎, 12-11-2011 05:45 PM
    • Replies: 0
    • Views: 1,305
    12-11-2011, 05:45 PM Go to last post
  41. Group comparisons using Kruskal-Wallis AND a categorical mediator?

    Hi there, I have four patient groups which I compare in terms of a contiuous variable using Kruskal-Wallis (due to small sample sizes and...

    Started by MVTamburini‎, 11-07-2012 06:39 AM
    • Replies: 0
    • Views: 1,167
    11-07-2012, 06:39 AM Go to last post
  42. Group theoretic approach to ANOVA

    Hello, I have been following the works of Diaconis, Viana and van de Ven and have a query about the approach taken in van de Ven's dissertation...

    Started by Ravi Kulkarni‎, 07-27-2011 03:10 AM
    • Replies: 3
    • Views: 1,713
    07-28-2011, 03:05 AM Go to last post
  43. grouping categorical variables for regression

    I'm working with survey data dealing with reproductive health among women with HIV. I would like to explore possible factors which may contribute to...

    Started by bomme‎, 11-20-2010 10:20 AM
    • Replies: 0
    • Views: 3,383
    11-20-2010, 10:20 AM Go to last post
  44. 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: 2,098
    05-21-2010, 12:46 PM Go to last post
  45. grouping doubt

    Hi , I am new to base sas trying to learn on my own , I have a doubt , I have a data set which contains the information about the firms , they...

    Started by singhakshay1710‎, 05-12-2009 09:41 PM
    • Replies: 0
    • Views: 2,101
    05-12-2009, 09:41 PM Go to last post
  46. Grouping Observations

    Hello! New to the forum here and looking for help. I have 3 separate "Urban" monitoring locations. 10 observations were made at each location. ...

    Started by rs123‎, 09-28-2017 06:07 PM
    • Replies: 3
    • Views: 232
    09-29-2017, 03:59 PM Go to last post
  47. 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: 1,057
    05-02-2012, 09:19 AM Go to last post
  48. Growth Curve Modeling and Covariates

    Hi All, I am in the midst of trying to work out an issue I am having with my model. I have an environmental variable that I want to use as a...

    Started by jazzman19‎, 11-01-2012 01:18 PM
    • Replies: 0
    • Views: 984
    11-01-2012, 01:18 PM Go to last post
  49. Gumbel Copula

    Does anybody have some code or a paper to show how to simulate n dimensional Gumbel copula ?

    Started by kfcnhl‎, 08-12-2009 02:55 PM
    • Replies: 0
    • Views: 2,405
    08-12-2009, 02:55 PM Go to last post
  50. Hartigan's Dip Test for Bi-Modality: Rejecting surprising distributions

    Hi, I'm new here. Thanks for providing this forum! I'm checking some separate sample distributions for bi-modality since most but not all of them...

    Started by kerrio‎, 12-22-2011 12:31 AM
    • Replies: 1
    • Views: 7,012
    12-29-2011, 08:05 PM Go to last post
  51. Have population, use inferential stats? Non-normal dependent variable, what to do?

    Statistics people! I have two questions for you. I am NOT a statistician so please be nice and answer simply :) Background: We are looking at...

    Started by alea iacta est‎, 06-19-2014 05:22 PM
    inferential statistics, interaction, logistic regression, normal distribution, population
    • Replies: 1
    • Views: 1,338
    06-20-2014, 09:07 PM Go to last post
  52. Having a hard time deciding on what test to use for data

    Here is the premise: There are large events taking place on park land. We are using noise disturbance hardware to measure decibels during and not...

    Started by NPS‎, 07-28-2014 09:37 AM
    large sample size, mann whitney
    • Replies: 6
    • Views: 1,868
    07-28-2014, 02:05 PM Go to last post
  53. Health center level data to client level data?? posible?

    I have data for 31 centers (observations) and have the following variables of interest. Ex: IDcenter= 1 client_black=25 client_white 50...

    Started by Marvin85‎, 07-30-2013 09:23 AM
    • Replies: 8
    • Views: 2,009
    08-08-2013, 01:13 PM Go to last post
  54. Heckman regression models

    I am using a 2step heckman regression model and I want to evaluate that probit looks okay and that the model converges and that there are no "red"...

    Started by micdhack‎, 09-26-2016 11:37 AM
    • Replies: 2
    • Views: 1,306
    09-26-2016, 03:27 PM Go to last post
  55. Hello Everyone, need stats help

    Hello everyone, :wave: I'm new to this forum. I need some help figuring out what kind of analysis to run for my undergraduate thesis. I did...

    Started by Rob at U of T‎, 04-09-2011 04:48 PM
    • Replies: 0
    • Views: 2,538
    04-09-2011, 04:48 PM Go to last post
  56. Help Hierarchial Cluster Analysis & Categorical data

    :confused: Hi, I am trying to cluster my variables which are all the letters of the alphabet by the observations of many participants in a...

    Started by Jalsalmi‎, 03-16-2013 06:21 PM
    categorical variables, cluster
    • Replies: 0
    • Views: 2,415
    03-16-2013, 06:21 PM Go to last post
  57. Post Help regarding th topic: Shrinkage Precision Matrix Estimation with Application

    'Shrinkage Precision Matrix Estimation with Applications to Beamforming' or 'Shrinkage Estimation Precision Matrix with Applications to Beamforming'....

    Started by raksmax‎, 08-14-2017 12:46 AM
    assignment, engineering, statistics, statistics assignment
    • Replies: 1
    • Views: 218
    08-14-2017, 07:36 AM Go to last post
  58. HELP - citation model in R

    Hello everyone. I need help with the citation model as explained in This article "Bibliometric tools applied to analytical articles: the example...

    Started by terstat‎, 08-18-2016 10:15 AM
    bibliometric, citation, model, r software, statistic
    • Replies: 3
    • Views: 1,793
    09-05-2016, 09:04 AM Go to last post
  59. Help - problem

    Hi I have a variable VA and want to know if there are significant differences in this variable between group A and group B. N = 93 samples...

    Started by bluecat‎, 06-16-2009 11:47 AM
    • Replies: 1
    • Views: 2,285
    06-17-2009, 10:15 PM Go to last post
  60. Lightbulb Help about kappa coefficient?

    Is it acceptable using kappa coefficient for examining intra-rater agreement? or which statistical measurement do you prefer to use for...

    Started by avatar_avatar‎, 05-05-2013 05:02 PM
    • Replies: 0
    • Views: 938
    05-05-2013, 05:02 PM Go to last post

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