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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: 18,657
    10-11-2014, 12:02 PM Go to last post
  1. simple regression question (I think)

    Hi there, Suppose I have the simple libear regression model: Y=a0+a1*X+ε where ε~N(0,σ^2) Suppose that via least squares I estimate a0...

    Started by leo nidas‎, 09-24-2008 07:19 AM
    • Replies: 5
    • Views: 3,818
    09-24-2008, 02:35 PM Go to last post
  2. Probability Theory Exam

    Studying for a probability exam and here are two practice problems I can't seem to solve 1. Let P be the uniform distribution on a finite set...

    Started by statboy‎, 09-17-2008 10:04 AM
    • Replies: 1
    • Views: 4,276
    09-17-2008, 01:21 PM Go to last post
  3. Cut-off Points in Linear Discriminant Analysis

    Everyone can discuss about the cut-off points in linear discriminant analysis. I know how to calculate it when there are 2 groups. But, more than 2...

    Started by shike‎, 09-15-2008 11:55 PM
    • Replies: 2
    • Views: 5,747
    09-16-2008, 02:22 AM Go to last post
  4. Deck of cards: Odds of being dealt 3 of a suit?

    I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

    Started by domino‎, 09-15-2008 03:31 AM
    • Replies: 2
    • Views: 8,508
    09-15-2008, 09:46 AM Go to last post
  5. 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: 4,454
    09-11-2008, 09:42 AM Go to last post
  6. 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: 3,940
    09-10-2008, 12:41 PM Go to last post
  7. 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: 2,429
    09-10-2008, 08:30 AM Go to last post
  8. Question pre-test post-test difficulty

    Hi everyone, I'm new to the forum, but I'm definitely glad it's here. I have a difficult research design problem / stats problem that I was...

    Started by rclukey‎, 09-09-2008 05:09 PM
    • Replies: 1
    • Views: 5,881
    09-09-2008, 10:02 PM Go to last post
  9. Meta-Analysis

    Hello, I am in the process of coding a number of study results for the purpose of conducting a meta-analysis. At present i am having an issue with...

    Started by Jogilvie‎, 09-03-2008 06:33 AM
    • Replies: 1
    • Views: 3,527
    09-09-2008, 12:24 AM Go to last post
  10. Question Q re Gauss-Newton Method convergence in Nonlinear Regression

    I am using a Minitab implementation of the Gauss-Newton Method to approximate a nonlinear regression of a model with 6 parameters (2 are covariates)....

    Started by jalanthomas‎, 09-07-2008 10:25 AM
    • Replies: 1
    • Views: 2,409
    09-07-2008, 08:18 PM Go to last post
  11. Question Anova

    Develop two-null hypothesis tests to ascertain if there are any statistical variances in the averages of bus route times and any statistical variance...

    Started by tyrankj‎, 09-02-2008 12:20 AM
    • Replies: 2
    • Views: 4,767
    09-02-2008, 03:38 AM Go to last post
  12. From OLS to Box Cox to ?

    Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

    Started by andony‎, 08-29-2008 01:25 PM
    • Replies: 4
    • Views: 5,950
    08-31-2008, 02:58 PM Go to last post
  13. 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: 4,367
    08-28-2008, 03:19 PM Go to last post
  14. 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: 4,182
    08-28-2008, 11:18 AM Go to last post
  15. 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: 2,170
    08-27-2008, 10:06 PM Go to last post
  16. 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: 9,241
    08-27-2008, 04:11 PM Go to last post
  17. 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: 10,330
    08-27-2008, 03:34 PM Go to last post
  18. 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: 2,745
    08-25-2008, 11:05 AM Go to last post
  19. 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: 4,449
    08-23-2008, 09:12 PM Go to last post
  20. 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: 2,519
    08-21-2008, 08:00 PM Go to last post
  21. 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: 2,345
    08-21-2008, 01:23 PM Go to last post
  22. 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: 2,355
    08-21-2008, 12:36 PM Go to last post
  23. 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: 3,129
    08-20-2008, 04:06 PM Go to last post
  24. 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: 9,270
    08-19-2008, 10:32 PM Go to last post
  25. 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: 4,821
    08-18-2008, 12:07 PM Go to last post
  26. 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: 2,591
    08-18-2008, 03:29 AM Go to last post
  27. 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: 19,063
    08-10-2008, 08:16 PM Go to last post
  28. 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: 4,605
    08-05-2008, 02:00 PM Go to last post
  29. 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: 2,865
    08-04-2008, 11:28 PM Go to last post
  30. 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: 2,857
    08-04-2008, 10:43 AM Go to last post
  31. 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: 5,377
    08-03-2008, 06:52 PM Go to last post
  32. 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: 2,544
    08-03-2008, 11:23 AM Go to last post
  33. 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: 7,466
    07-31-2008, 04:08 PM Go to last post
  34. 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: 6,798
    07-29-2008, 12:15 PM Go to last post
  35. 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: 2,942
    07-28-2008, 05:28 AM Go to last post
  36. 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: 2,197
    07-26-2008, 10:26 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: 10,741
    07-25-2008, 08:59 AM Go to last post
  38. 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: 3,780
    07-24-2008, 10:33 PM Go to last post
  39. 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: 9,661
    07-18-2008, 01:04 PM Go to last post
  40. 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: 3,583
    07-14-2008, 09:59 PM Go to last post
  41. 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: 3,368
    07-14-2008, 07:46 AM Go to last post
  42. 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: 3,127
    07-09-2008, 09:53 AM Go to last post
  43. 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: 7,007
    07-01-2008, 01:58 PM Go to last post
  44. 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: 3,940
    06-29-2008, 08:07 AM Go to last post
  45. 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: 3,616
    06-27-2008, 05:47 AM Go to last post
  46. 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: 8,617
    06-26-2008, 03:15 AM Go to last post
  47. 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: 3,032
    06-24-2008, 10:44 AM Go to last post
  48. 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: 2,873
    06-23-2008, 09:54 AM Go to last post
  49. 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: 7,525
    06-20-2008, 08:13 AM Go to last post
  50. 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: 2,551
    06-17-2008, 02:40 AM Go to last post
  51. 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: 2,875
    06-11-2008, 10:26 AM Go to last post
  52. 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: 3,242
    06-03-2008, 07:20 PM Go to last post
  53. 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: 6,531
    05-30-2008, 10:15 AM Go to last post
  54. 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: 2,986
    05-27-2008, 09:35 AM Go to last post
  55. 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: 2,856
    05-24-2008, 11:20 AM Go to last post
  56. 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: 14,901
    05-23-2008, 08:33 AM Go to last post
  57. 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: 4,020
    05-01-2008, 11:08 AM Go to last post
  58. 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: 2,277
    04-24-2008, 08:37 AM Go to last post
  59. 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: 3,439
    04-11-2008, 05:31 AM Go to last post
  60. 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: 2,738
    02-04-2008, 12:50 PM Go to last post

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