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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: 18,750
    10-11-2014, 12:02 PM Go to last post
  1. 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: 3,590
    04-09-2006, 03:44 PM Go to last post
  2. 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: 2,297
    01-08-2007, 09:17 PM Go to last post
  3. 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: 2,473
    06-13-2007, 09:07 AM Go to last post
  4. 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: 2,759
    02-04-2008, 12:50 PM Go to last post
  5. 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: 3,484
    04-11-2008, 05:31 AM Go to last post
  6. 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: 2,897
    05-24-2008, 11:20 AM Go to last post
  7. 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: 3,030
    05-27-2008, 09:35 AM Go to last post
  8. 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: 2,900
    06-11-2008, 10:26 AM Go to last post
  9. 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: 2,570
    06-17-2008, 02:40 AM Go to last post
  10. 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: 2,893
    06-23-2008, 09:54 AM Go to last post
  11. 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: 3,049
    06-24-2008, 10:44 AM Go to last post
  12. 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: 3,154
    07-09-2008, 09:53 AM Go to last post
  13. 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: 3,392
    07-14-2008, 07:46 AM Go to last post
  14. 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: 9,729
    07-18-2008, 01:04 PM Go to last post
  15. 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: 3,796
    07-24-2008, 10:33 PM Go to last post
  16. 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: 10,801
    07-25-2008, 08:59 AM Go to last post
  17. 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: 2,974
    07-28-2008, 05:28 AM Go to last post
  18. 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: 2,570
    08-03-2008, 11:23 AM Go to last post
  19. 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: 2,623
    08-18-2008, 03:29 AM Go to last post
  20. 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: 2,185
    08-27-2008, 10:06 PM Go to last post
  21. Help in Genetic Analysis

    Hy, what is the better test (or software) to compare the genotype (or allele) frequency of several gene mutations, at the same time in two...

    Started by mnasi‎, 09-10-2008 08:30 AM
    • Replies: 0
    • Views: 2,449
    09-10-2008, 08:30 AM Go to last post
  22. Covariate Estimation & Unbiased Estimation

    I work with a group that utilizes the Mahalanobis Distance to detect the health of a system, mostly electronics. Within this research, we are looking...

    Started by 3waytie4last‎, 09-10-2008 12:41 PM
    • Replies: 0
    • Views: 4,006
    09-10-2008, 12:41 PM Go to last post
  23. Mahalanobis Distance

    I am doing research concerning the degradation of a particular system... In this case, a cooling fan for a computer. I am measuring three...

    Started by 3waytie4last‎, 09-11-2008 09:42 AM
    • Replies: 0
    • Views: 4,501
    09-11-2008, 09:42 AM Go to last post
  24. help choosing LDA situation to implement

    Hey all, I am a comp sci grad student interested in pattern recognition, and have been told that LDA is a good place to start before moving into...

    Started by dkwestbr‎, 10-06-2008 01:00 AM
    • Replies: 0
    • Views: 2,449
    10-06-2008, 01:00 AM Go to last post
  25. A Simple Meta-Analysis query

    Hi All, I am working on my first meta-analysis project and this may sound silly, but I am having difficulty deciding which studies to include. ...

    Started by claireH‎, 10-10-2008 04:50 AM
    • Replies: 0
    • Views: 2,452
    10-10-2008, 04:50 AM Go to last post
  26. concordance of two sets of data

    here is my problem: for a set of genes i have an expected(predicted) phenotype and an observed phenotype. i need prove that the level of...

    Started by anjan_purkayastha‎, 10-13-2008 12:29 PM
    • Replies: 0
    • Views: 3,384
    10-13-2008, 12:29 PM Go to last post
  27. Bayesian Logistic Regression

    I have the following logistic regression problem I am trying to solve using bayesian approach. " We consider a logistic regression setting where...

    Started by vioravis‎, 10-13-2008 03:09 PM
    • Replies: 0
    • Views: 3,153
    10-13-2008, 03:09 PM Go to last post
  28. Two Stage Least Squares Regression

    I am trying to test a model and have been advised that 2SLS is the appropriate method. I am using SPSS which has the 2SLS option. My problem is that...

    Started by Lisa‎, 10-19-2008 06:35 AM
    • Replies: 0
    • Views: 5,036
    10-19-2008, 06:35 AM Go to last post
  29. Standard error (asymptotic standard error) of ŷi of exponential regression (Y = exp(a

    Hello People I was look a formual or description how to calculate standard error of ŷi or usually called asymptotic standard error in non-linear...

    Started by ggalex‎, 10-23-2008 10:49 AM
    • Replies: 0
    • Views: 25,362
    10-23-2008, 10:49 AM Go to last post
  30. Correlation/Regression using Aggregrated Data

    Hi, This is something that I've been wondering about for some time now, but which I've never managed to find a formal reference for....

    Started by EH11‎, 10-30-2008 07:44 AM
    • Replies: 0
    • Views: 3,204
    10-30-2008, 07:44 AM Go to last post
  31. Please help?

    Alright, so honestly, I've actually looked up in both my textbooks as well as online tutorials for simplified explanations as to how I can solve the...

    Started by blithevanilla‎, 11-17-2008 12:18 AM
    • Replies: 0
    • Views: 2,265
    11-17-2008, 12:18 AM Go to last post
  32. help with sequential type of tests in statistics for hyppothesis testing

    my research topic is sequential type of tests in statistics for hyppothesis testing and i have been told to coollect atleast 20 sequential type...

    Started by rashid‎, 11-18-2008 10:13 AM
    • Replies: 0
    • Views: 2,101
    11-18-2008, 10:13 AM Go to last post
  33. website splits - sample sizes

    Id like to do some research into website splits. As visitors arrive to one of our websites (lets call it id=123), the page will randomly deliever...

    Started by hip_au‎, 11-19-2008 08:47 PM
    • Replies: 0
    • Views: 2,105
    11-19-2008, 08:47 PM Go to last post
  34. When are random variables random?

    I have an environmental dataset in which a treatment was carried out on a series of plots (situated on the landscape) in duplicate. However the...

    Started by jdmac11‎, 11-26-2008 09:34 AM
    • Replies: 0
    • Views: 3,537
    11-26-2008, 09:34 AM Go to last post
  35. Is this a vaild data transformation method?

    Hello Talkstats people, I am another hopeless case who needs some help with my dissertation statistics. Basically I am not sure if the method...

    Started by anotherhopelesscase‎, 11-26-2008 09:49 AM
    • Replies: 0
    • Views: 4,448
    11-26-2008, 09:49 AM Go to last post
  36. Effect of Culture on Scales

    I am considering implementing a study asking respondents to rate several items on 1-10 scale. In America, I know the limitations of the scale. ...

    Started by mpongras‎, 12-01-2008 10:57 AM
    • Replies: 0
    • Views: 2,156
    12-01-2008, 10:57 AM Go to last post
  37. Product pricing question

    Hello all. It's been a long time since I've been on this forum. Glad I was able to find it again. I'm afraid my stats experience is limited to...

    Started by vangogh228‎, 12-08-2008 07:41 AM
    • Replies: 0
    • Views: 2,786
    12-08-2008, 07:41 AM Go to last post
  38. Unhappy Two groups & two

    Hi Wondering if anyone can help with this one. Well, several really. I am planning to conduct a study examining how easy it is to use two...

    Started by SML‎, 12-18-2008 02:00 PM
    • Replies: 0
    • Views: 2,187
    12-18-2008, 02:00 PM Go to last post
  39. "Maximally uncorrelated" representation for a covariance matrix

    Hi, I have a question about the covariance matrix from a real-life study in particle physics. I am working on a non-linear fit of a...

    Started by pmn1‎, 12-20-2008 08:16 PM
    • Replies: 0
    • Views: 2,163
    12-20-2008, 08:16 PM Go to last post
  40. Power Analysis for SURVEY data

    I am doing secondary data analysis on survey data that has a clustered, complex random design. I am using STATA 9.0. For the Power analysis do I use...

    Started by kawillit‎, 01-10-2009 07:31 PM
    • Replies: 0
    • Views: 4,109
    01-10-2009, 07:31 PM Go to last post
  41. Multivariate Statistics: Which is appropriate PCA, DFA, MANCOVA?

    Hello there, I am trying to determine which multivariate statistical techniques are most appropriate to address my biological questions and type...

    Started by lophodont‎, 01-12-2009 04:15 PM
    • Replies: 0
    • Views: 5,240
    01-12-2009, 04:15 PM Go to last post
  42. Tests for Change in Mean Dependent data

    Hello, I am doing research on change point analysis. I am working on the attached paper and I'm trying to see where the number in Table 1 are...

    Started by SVM‎, 01-14-2009 12:52 AM
    • Replies: 0
    • Views: 3,036
    01-14-2009, 12:52 AM Go to last post
  43. Cool Alternative to two-sample t-test when proportions are SMALL (<0.001)

    Hi, I'm looking for an alternative to the two-sample (independent) t-test for equality of proportions. The two-sample t-statistic only holds...

    Started by swnicholson‎, 01-14-2009 04:15 PM
    • Replies: 0
    • Views: 4,335
    01-14-2009, 04:15 PM Go to last post
  44. Post How to do this power study?

    Suppose I have a function f(x) = { 0 if 0 =< x < 0.5 { Beta=0.5 if 0.5 =< x =< 1 y = f(x) +...

    Started by SVM‎, 01-17-2009 11:22 PM
    • Replies: 0
    • Views: 3,031
    01-17-2009, 11:22 PM Go to last post
  45. 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: 3,572
    01-19-2009, 12:19 AM Go to last post
  46. Question Repeated measurements are negatively correlated

    I have a set of data on 9 subjects. A measurement is taken every week for 10 consecutive weeks. Say I would like to compare the measurements taken on...

    Started by anggraini_13‎, 01-20-2009 03:07 AM
    • Replies: 0
    • Views: 2,325
    01-20-2009, 03:07 AM Go to last post
  47. testing

    I am new to thread but wondering how I would go about testing inferentially a hypothesis for a research paper. It would be regarding productivity as...

    Started by brickwall‎, 02-09-2009 11:06 PM
    • Replies: 0
    • Views: 2,399
    02-09-2009, 11:06 PM Go to last post
  48. variables in linear mixed model

    Hello, I'm performing a longitudinal study, that compares computer use duration measured by 2 different methods: by questionnaire and computer...

    Started by richterr‎, 02-11-2009 10:27 AM
    • Replies: 0
    • Views: 2,476
    02-11-2009, 10:27 AM Go to last post
  49. Testing change between 2 samples at 2 periods of time

    Hi Id wonder if anyone could help me. Im having one of those brain freeze moments when you think you may know the answer but really would...

    Started by lost in stats‎, 02-20-2009 02:54 AM
    • Replies: 0
    • Views: 4,289
    02-20-2009, 02:54 AM Go to last post
  50. 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: 5,268
    02-21-2009, 01:38 PM Go to last post
  51. Comparing deaths with reportings

    Hi. For my dissertation I am looking at how "Superbugs" are represented in the Media, and how the media's portrayal of them has caused some...

    Started by dellmarie88‎, 02-21-2009 02:10 PM
    • Replies: 0
    • Views: 1,972
    02-21-2009, 02:10 PM Go to last post
  52. Videopods

    Is anyone aware of any videopods that cover econometrics courses (especially time series and cross sectional analysis?

    Started by 12345678‎, 02-25-2009 12:15 PM
    • Replies: 0
    • Views: 2,113
    02-25-2009, 12:15 PM Go to last post
  53. 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: 2,445
    03-06-2009, 04:22 PM Go to last post
  54. need urgent help! how analyze data?

    Hi there, I hope anyone can help... Have been looking up text-book after text-book without getting the info I need! I am trying to analyze some...

    Started by SurveyQueen‎, 03-07-2009 10:56 AM
    • Replies: 0
    • Views: 2,573
    03-07-2009, 10:56 AM Go to last post
  55. Post Help in study design! URGENT!

    Suppose I do a retrospective review of patients records of two groups of patients.. one with diagnosis A and the other group with diagnosis B. And I...

    Started by afrasyabkhan‎, 03-08-2009 03:38 AM
    • Replies: 0
    • Views: 2,435
    03-08-2009, 03:38 AM Go to last post
  56. Help?

    I have a survey of college students in which I created individual weights to account for differences in Age, Gender, Race, and degree level, so...

    Started by lisa131067‎, 03-07-2009 08:35 PM
    • Replies: 0
    • Views: 1,823
    03-07-2009, 08:35 PM Go to last post
  57. best presentation of data to aid analysis

    Hello, I need some help with formulating a methodology for my current dissertation. I am investigating the impact of ability setting on students....

    Started by Gemstar‎, 03-12-2009 02:02 AM
    • Replies: 0
    • Views: 2,191
    03-12-2009, 02:02 AM Go to last post
  58. Testing for Developmental Significance

    Please help with my current research analysis. I am studying university students' frequency us, confidence, and success at various study...

    Started by owen7‎, 03-16-2009 02:46 PM
    • Replies: 0
    • Views: 2,313
    03-16-2009, 02:46 PM Go to last post
  59. Isotonic Regression

    Hello, I would like to ask if someone knows the answers to the next questions: 1. When do I use Isotonic Regression and why ? 2. What's the...

    Started by WeeG‎, 03-20-2009 04:19 PM
    • Replies: 0
    • Views: 3,142
    03-20-2009, 04:19 PM Go to last post
  60. About the distribution of confidence interval for Weibull

    Does anyone have an idea about the distribution of the 95&#37; confidence intervals for a population with a Weibull distribution? Thanks in advance!

    Started by ppmovie‎, 03-23-2009 06:18 PM
    • Replies: 0
    • Views: 3,515
    03-23-2009, 06:18 PM Go to last post

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