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Threads 3181 to 3209 of 3209

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: 19,435
    10-11-2014, 12:02 PM Go to last post
  1. 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: 3,764
    06-27-2008, 05:47 AM Go to last post
  2. 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: 8,879
    06-26-2008, 03:15 AM Go to last post
  3. 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
  4. 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
  5. 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
  6. 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: 2,689
    06-17-2008, 02:40 AM Go to last post
  7. 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
  8. 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
  9. 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: 7,001
    05-30-2008, 10:15 AM Go to last post
  10. 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
  11. 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
  12. 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: 15,338
    05-23-2008, 08:33 AM Go to last post
  13. 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
  14. 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
  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. 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
  17. 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: 2,731
    01-12-2008, 10:19 AM Go to last post
  18. 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: 3,152
    10-11-2007, 11:30 AM Go to last post
  19. 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: 8,130
    08-27-2007, 04:38 AM Go to last post
  20. 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: 3,483
    06-15-2007, 01:34 PM Go to last post
  21. 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
  22. 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
  23. 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
  24. 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
  25. 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: 2,684
    09-08-2006, 08:32 PM Go to last post
  26. 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
  27. 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: 5,905
    03-24-2006, 03:02 PM Go to last post
  28. 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: 6,732
    02-18-2006, 02:27 PM Go to last post
  29. 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

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