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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: 19,432
    10-11-2014, 12:02 PM Go to last post
  1. Help Anova

    hi everyone, I currently try to find an open source C/C++statistical library. Basically, I want to calculate the p and F value from oneway (or N...

    Started by 02020954‎, 12-12-2005 07:11 PM
    • Replies: 11
    • Views: 4,779
    12-14-2005, 05:55 PM Go to last post
  2. Sample size for repeated measures or dependent-sample t

    Hi John: I have another question. I collected these data from parents and their children about children's chronic condition. I wanted 100...

    Started by Susanbwh‎, 02-18-2006 12:51 PM
    • Replies: 1
    • Views: 6,729
    02-18-2006, 02:27 PM Go to last post
  3. Two-tail test

    For 1996, the U.S. Department of Agriculture has estimated that American consumers would have eaten, on average, 2.6 pounds of cottage cheese...

    Started by toby‎, 03-19-2006 01:24 PM
    • Replies: 1
    • Views: 5,904
    03-24-2006, 03:02 PM Go to last post
  4. 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: 3,727
    04-09-2006, 03:44 PM Go to last post
  5. Longitudinal Statistics

    I'm performing a longitudinal study on allergen challenged (daily) mice (3 total) where I sample blood from the same mouse daily, over a week's time,...

    Started by WTB‎, 09-08-2006 04:34 PM
    • Replies: 1
    • Views: 2,683
    09-08-2006, 08:32 PM Go to last post
  6. attrition: comparing *surviving* sample to original

    Hi, I have a question about attrition analyses in longitudinal databases. I know that I can compare the subjects who dropped out...

    Started by foreverpostdoc‎, 11-15-2006 11:45 AM
    • Replies: 4
    • Views: 3,205
    11-19-2006, 03:33 PM Go to last post
  7. ANOVA without random variables?

    I am making a preliminary selection of algorithms to use for recognizing a collection of objects in images. I have a simulation that creates a set...

    Started by jalanthomas‎, 01-08-2007 09:17 PM
    • Replies: 0
    • Views: 2,363
    01-08-2007, 09:17 PM Go to last post
  8. T scores & a Multivariate Analysis

    4 tests were administered to 2 different groups. The scales of measurement for the tests were different, so the raw scores were converted to...

    Started by colorfulbouquet‎, 01-29-2007 11:31 AM
    • Replies: 1
    • Views: 3,170
    05-30-2007, 12:02 AM Go to last post
  9. General lasso question

    Hi all, I'm using logistic regression with a lasso-like constraint on the parameters. I have noticed that very often the sum of the absolute...

    Started by olac‎, 06-13-2007 09:07 AM
    • Replies: 0
    • Views: 2,556
    06-13-2007, 09:07 AM Go to last post
  10. Regression Method

    I need to create a software algorithm to calculate cubic or quartic regression on an array of values, but it's been a while since my last stats...

    Started by djshusko‎, 06-13-2007 09:20 AM
    • Replies: 4
    • Views: 3,482
    06-15-2007, 01:34 PM Go to last post
  11. comparing two measurements over time

    I'm designing an experiment with two condition. Cond A with no manipulation of the independent var and ConB with manipulation of the independent var....

    Started by dirkheld‎, 08-22-2007 07:11 AM
    • Replies: 8
    • Views: 8,128
    08-27-2007, 04:38 AM Go to last post
  12. New guy, Stats help needed with this problem.

    Hi guys, I'm taking Mathematical Statistics course and we are following Statistical Inference book by George Casella. I was able to solve most of...

    Started by $tatsGuy‎, 10-10-2007 09:48 PM
    • Replies: 3
    • Views: 3,151
    10-11-2007, 11:30 AM Go to last post
  13. markov chains- estimation

    Hello all, my task is to estimate parametres of markov chain model basing on real economic data. Does anyone have any idea what sort of data would...

    Started by zhukov‎, 01-11-2008 05:23 PM
    • Replies: 1
    • Views: 2,730
    01-12-2008, 10:19 AM Go to last post
  14. weibull distribution

    i'm studying film life cycle using the weibull distribution. given the survival function, there exists the hazard rate, or the failure rate, a point...

    Started by angelo_s‎, 02-04-2008 12:50 PM
    • Replies: 0
    • Views: 2,862
    02-04-2008, 12:50 PM Go to last post
  15. Describing a curve in order to compare with species abundance

    Hi, I was wondering if there was an established method / algorithm for describing a curve (in this case, grain-size data) in order to compare...

    Started by nicknara25‎, 04-11-2008 05:31 AM
    • Replies: 0
    • Views: 3,747
    04-11-2008, 05:31 AM Go to last post
  16. Impact of static sample on CI

    I'll get straight to the question first and then explain it. In a longitudinal study, does having a static sample impact how the CI is...

    Started by TRandall‎, 04-23-2008 02:42 PM
    • Replies: 1
    • Views: 2,373
    04-24-2008, 08:37 AM Go to last post
  17. Weighted EM algorithm?

    Hi, I have written an EM algorithm for mixtures of gaussian distributions. However, my problem is that I would now like to "weight" the EM so that...

    Started by tecne‎, 02-22-2008 09:23 PM
    • Replies: 1
    • Views: 4,181
    05-01-2008, 11:08 AM Go to last post
  18. continuous/categorical IV in anova

    Hi, I understand that ANOVA assumes categorical IVs, and ANCOVA should be used if continuous IVs are included in the model. I am currently analyzing...

    Started by kk49‎, 05-21-2008 08:41 PM
    • Replies: 8
    • Views: 15,337
    05-23-2008, 08:33 AM Go to last post
  19. Partial Least Squares

    Hello, I am doing a project about "Partial Least Squares", and I find it a bit hard to understand the math part of the model. I was wondering if...

    Started by WeeG‎, 05-24-2008 11:20 AM
    • Replies: 0
    • Views: 3,042
    05-24-2008, 11:20 AM Go to last post
  20. Kaplan-Meier: Overall time longer than 2 factors

    I have an SPSS output of a Kaplan-Meier in which I compared to factors. The overall mean survival time is longer than the 2 factors. Is this because...

    Started by sheederj‎, 05-27-2008 09:35 AM
    • Replies: 0
    • Views: 3,248
    05-27-2008, 09:35 AM Go to last post
  21. bell curve question

    I have data distributed unevenly on both side of the average.How do I go about normalizing the data so that it makes a perfect curve? I don't have a...

    Started by cpp_coder‎, 05-26-2008 01:49 PM
    • Replies: 10
    • Views: 7,000
    05-30-2008, 10:15 AM Go to last post
  22. Question Question About K-Means

    I'm currently working on a project that looks at clustering retail stores on the bases of their Sales performance by item class. Items that are sold...

    Started by Kam36‎, 06-03-2008 05:11 PM
    • Replies: 4
    • Views: 3,370
    06-03-2008, 07:20 PM Go to last post
  23. Constucting ARMA realizations

    Given estimates for the AR and MA coefficients for an ARMA(p,q) model with a non zero mean, how do I construct a realization of the time series? ...

    Started by devlynn167‎, 06-11-2008 10:26 AM
    • Replies: 0
    • Views: 2,985
    06-11-2008, 10:26 AM Go to last post
  24. Two objective functions in one Unconstrained optimization problem

    Think about we have 2 objective functions and both of them are in the form of being equal to zero. For example, maximize f1: x1^2+x1*x2+2*x2^3=0...

    Started by SPS‎, 06-17-2008 02:40 AM
    • Replies: 0
    • Views: 2,688
    06-17-2008, 02:40 AM Go to last post
  25. Joint Normal CDF

    Hello I am new to this forum as well as to actuary field. I have this question: There are two random variables X_1 and X_2 following standard...

    Started by hpriye‎, 06-19-2008 05:10 AM
    • Replies: 7
    • Views: 7,677
    06-20-2008, 08:13 AM Go to last post
  26. quantile regression vs. non-parametric curve fit of quantiles

    hello, i am doing some data analysis using a technique like the one pictured here:...

    Started by d^2‎, 06-23-2008 09:54 AM
    • Replies: 0
    • Views: 2,979
    06-23-2008, 09:54 AM Go to last post
  27. Lanczos' Algorithm for Sparse Matrices

    I just have a quick question about the implementation of lanczos' algorithm. If you are unfamiliar with it, it can be found at...

    Started by senorbum‎, 06-24-2008 10:44 AM
    • Replies: 0
    • Views: 3,175
    06-24-2008, 10:44 AM Go to last post
  28. Question about copula-GARCH models

    Hello everyone, I am learning about copulas and also do some MATLAB coding to get better understanding of how copulas work. Recently I have...

    Started by Peskarik‎, 06-20-2008 04:39 PM
    • Replies: 3
    • Views: 8,878
    06-26-2008, 03:15 AM 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: 3,762
    06-27-2008, 05:47 AM Go to last post
  30. Multinomial logistic regression

    I have been carrying out some analysis using multinomial logistic regression and I would like to compare two competing models to see which is the...

    Started by josie‎, 06-27-2008 09:44 AM
    • Replies: 2
    • Views: 4,103
    06-29-2008, 08:07 AM Go to last post
  31. Eigenvector for large matrices

    Well, this is kind of a linear algebra question, but is used very often in statistics, so it seems applicable for this forum. My question is, does...

    Started by senorbum‎, 06-30-2008 09:01 AM
    • Replies: 11
    • Views: 7,211
    07-01-2008, 01:58 PM Go to last post
  32. Testing Accuracy of Tridiagonal Matrix Computation

    So I implemented a lanczos algorithm which tridiagonalizes a real symmetric matrix. However, I don't know if my result is accurate. How would I be...

    Started by senorbum‎, 07-09-2008 09:53 AM
    • Replies: 0
    • Views: 3,277
    07-09-2008, 09:53 AM Go to last post
  33. simultanoues equations for panel data

    I want to estimate a simultaneous equations model in which each structural equation has a panel data structure. how to do it? Stata doesn't have a...

    Started by loukil‎, 07-14-2008 07:46 AM
    • Replies: 0
    • Views: 3,588
    07-14-2008, 07:46 AM Go to last post
  34. 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: 3,807
    07-14-2008, 09:59 PM Go to last post
  35. Smile Comparing 2 Likert scale with different scale numbers

    One of my surveys has a Likert scale of 1-7. The other survey that I am comparing it too has a scale of 0-5. My study is a correlation study, but I...

    Started by jillyoung‎, 07-18-2008 01:04 PM
    • Replies: 0
    • Views: 10,163
    07-18-2008, 01:04 PM Go to last post
  36. Weighting by sample size/confidence intervals in regression analysis?

    Hello, I am conducting an analysis of how a gene frequency (technically allele frequency) correlates with certain ecological variables (mainly...

    Started by dtae‎, 07-24-2008 10:33 PM
    • Replies: 0
    • Views: 3,989
    07-24-2008, 10:33 PM Go to last post
  37. Plus-4 Method

    Can anyone explain the reasoning behind why the "Plus-4" Method is more reliable? Or, can anyone point me to a resource that explains why? This is...

    Started by theviaster‎, 07-25-2008 08:59 AM
    • Replies: 0
    • Views: 11,167
    07-25-2008, 08:59 AM Go to last post
  38. Question What test?

    HI! Thanks to anyone that is reading this!! I am a masters student and I am trying to figure out what test I should use to analyze some of my...

    Started by Candice‎, 07-25-2008 10:14 PM
    • Replies: 1
    • Views: 2,313
    07-26-2008, 10:26 PM Go to last post
  39. Longitudinal Data Analysis

    Hello people, I need some help with LDA, I have important home work to do and I have a problem. I got autocorrelation of a model: (obs=70) ...

    Started by WeeG‎, 07-28-2008 05:28 AM
    • Replies: 0
    • Views: 3,127
    07-28-2008, 05:28 AM Go to last post
  40. time variables in a regression

    Hi all, I'm looking at a linear regression model using the data on wars in the 20th century. There are two time variables on the right-hand...

    Started by user9791‎, 07-29-2008 08:35 AM
    • Replies: 2
    • Views: 7,045
    07-29-2008, 12:15 PM Go to last post
  41. finding quantiles

    how do you find the quantile of a single number in a distribution in R? input: number output: percentage THank you!

    Started by sleck‎, 07-31-2008 10:42 AM
    • Replies: 5
    • Views: 7,696
    07-31-2008, 04:08 PM Go to last post
  42. Smile need help for my research

    Hello ! Two types of people probably lurk on this type of Internet site! The ones who hate statistics and for which numerical logic remains a...

    Started by statstruggler‎, 08-03-2008 11:23 AM
    • Replies: 0
    • Views: 2,750
    08-03-2008, 11:23 AM Go to last post
  43. Hypothesis testing

    conduct a hypotheses text for each sample at the .01 level of significance and what action should be taken provide the test statistic and p-value for...

    Started by rock9449‎, 08-02-2008 08:49 PM
    • Replies: 4
    • Views: 5,608
    08-03-2008, 06:52 PM Go to last post
  44. negligible trend tests?

    Greetings, I'm looking for information on how to test for a "negligible" trend. Info such as links to websites, formula/equations, and other...

    Started by Burgs‎, 08-02-2008 04:18 PM
    • Replies: 4
    • Views: 2,968
    08-04-2008, 10:43 AM Go to last post
  45. Which test to use?

    I'm trying to compare one data point to a distribution to see if that one data point fits into the distribution. The distribution is not a normal...

    Started by sleck‎, 07-30-2008 10:49 AM
    • Replies: 2
    • Views: 3,165
    08-04-2008, 11:28 PM Go to last post
  46. Help needed - estimating effect size

    Hi everyone, I'd really appreciate any help/guidance in solving a little problem of mine. I need to know how to estimate an effect size...

    Started by that_guy_‎, 08-01-2008 12:13 PM
    • Replies: 3
    • Views: 5,043
    08-05-2008, 02:00 PM Go to last post
  47. Regression Equation

    Hi there, Could someone please tell me which values do the following symbols represent in the regression equation: ∆R2 (R Square Change?) ∆F (F...

    Started by Jana‎, 08-09-2008 08:03 AM
    • Replies: 2
    • Views: 19,861
    08-10-2008, 08:16 PM Go to last post
  48. help on statisitcal test to use

    Hi! In my research I am using a surrogate approach (number of surrogates=100) and I making a comparison among indeces (as correlation indeces...

    Started by netrunner‎, 08-18-2008 03:29 AM
    • Replies: 0
    • Views: 2,779
    08-18-2008, 03:29 AM Go to last post
  49. Infinite divisibility under mixing - kernel density estimation

    Hi all, Can we consider a (multi-modal) kernel density estimate as a finite mixture of probabiliy distributions which would be infinite divisible?...

    Started by Cluster‎, 08-15-2008 12:15 PM
    • Replies: 3
    • Views: 5,136
    08-18-2008, 12:07 PM Go to last post
  50. Coding Open Ended Questions

    Hi, Can anyone tell me where I would begin if I wanted to code some open ended questions? People tell me it's easy, but I don't know; where or...

    Started by statman13‎, 08-04-2008 05:17 AM
    • Replies: 2
    • Views: 9,512
    08-19-2008, 10:32 PM Go to last post
  51. Factor Analysis Transformations: Thesis Help Needed Please!

    Hi I'm really hoping that someone will be able to help me? I am currently in the process of running a factor analysis. The individual items...

    Started by Kellyb‎, 08-20-2008 03:27 PM
    • Replies: 1
    • Views: 3,264
    08-20-2008, 04:06 PM Go to last post
  52. What kind of ANOVA is this?

    I'm doing an MRI research study on source memory and aging using emotional stimuli. This is probably a fairly basic question, but I'm not sure what...

    Started by amk86‎, 08-20-2008 03:18 PM
    • Replies: 2
    • Views: 2,481
    08-21-2008, 12:36 PM Go to last post
  53. Clusters - Help!!!!!

    Hi unfortunately my stats abilities fall well short of solving this problem properly (it is over 20 years since I finished my Chemical Engineering...

    Started by murfinp‎, 08-20-2008 04:45 AM
    • Replies: 1
    • Views: 2,519
    08-21-2008, 01:23 PM Go to last post
  54. Need a help on statistics pricing problem

    Attachement has the clear explanation Question is What can you conclude about the price in this problem if the probability function has...

    Started by sbokka‎, 08-21-2008 01:58 PM
    • Replies: 1
    • Views: 2,696
    08-21-2008, 08:00 PM Go to last post
  55. markov chain modelling

    Hi guys, Got a complex question regarding markov chain modelling. I'll start off with an example. Say you own a credit card and you can only...

    Started by ace123‎, 08-22-2008 04:51 PM
    • Replies: 7
    • Views: 4,655
    08-23-2008, 09:12 PM Go to last post
  56. A bit rusty could someone give me a shove in the right Direction Please

    Hi guys , I'm a management PhD student. I did a module on SPSS 14 before having to take a year out. I'm now starting to write up a bit of my thesis...

    Started by arobbo‎, 08-25-2008 07:48 AM
    • Replies: 1
    • Views: 2,905
    08-25-2008, 11:05 AM Go to last post
  57. Pretest-posttest and Likert Scale? Please Help!

    Hi, I'm new to the forum, and worried that I have screwed up my thesis project. I thought I designed a standard one group pretest/postest design. ...

    Started by So Lost‎, 08-01-2008 06:09 PM
    • Replies: 1
    • Views: 10,664
    08-27-2008, 03:34 PM Go to last post
  58. Repeated Measures ANOVA with a Continuous Variable?

    Hi, I'm trying to run a repeated measures ANOVA. There's a continuous variable that's affecting my data, that I need to control for. I tried...

    Started by Lola‎, 08-20-2008 10:01 AM
    • Replies: 2
    • Views: 9,629
    08-27-2008, 04:11 PM Go to last post
  59. Factor Analysis Projections

    I'm working with some time series data and I'm trying to determine if using factor analysis as a clustering method will lead me to a different...

    Started by lfalin‎, 08-27-2008 10:06 PM
    • Replies: 0
    • Views: 2,329
    08-27-2008, 10:06 PM Go to last post
  60. DOE for Logistic Regression

    Hello- Does anyone have any references for DOE (especially multivariate testing / Taguchi) for binary response variables (analyzing with Logistic...

    Started by B_Miner‎, 08-28-2008 09:31 AM
    • Replies: 5
    • Views: 4,368
    08-28-2008, 11:18 AM Go to last post

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