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Threads 3121 to 3180 of 3193

# Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

1. ### 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...

• Replies: 14
• Views: 18,657
10-11-2014, 12:02 PM
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...

• Replies: 5
• Views: 3,818
09-24-2008, 02:35 PM
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...

• Replies: 1
• Views: 4,276
09-17-2008, 01:21 PM
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...

• Replies: 2
• Views: 5,747
09-16-2008, 02:22 AM
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...

• Replies: 2
• Views: 8,508
09-15-2008, 09:46 AM
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...

• Replies: 0
• Views: 4,454
09-11-2008, 09:42 AM
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...

• Replies: 0
• Views: 3,940
09-10-2008, 12:41 PM
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...

• Replies: 0
• Views: 2,429
09-10-2008, 08:30 AM
8. ### 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...

• Replies: 1
• Views: 5,881
09-09-2008, 10:02 PM
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...

• Replies: 1
• Views: 3,527
09-09-2008, 12:24 AM
10. ### 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)....

• Replies: 1
• Views: 2,409
09-07-2008, 08:18 PM
11. ### 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...

• Replies: 2
• Views: 4,767
09-02-2008, 03:38 AM
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. ...

• Replies: 4
• Views: 5,950
08-31-2008, 02:58 PM
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...

• Replies: 1
• Views: 4,367
08-28-2008, 03:19 PM
14. ### DOE for Logistic Regression

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

• Replies: 5
• Views: 4,182
08-28-2008, 11:18 AM
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...

• Replies: 0
• Views: 2,170
08-27-2008, 10:06 PM
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...

• Replies: 2
• Views: 9,241
08-27-2008, 04:11 PM

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. ...

• Replies: 1
• Views: 10,330
08-27-2008, 03:34 PM
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...

• Replies: 1
• Views: 2,745
08-25-2008, 11:05 AM
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...

• Replies: 7
• Views: 4,449
08-23-2008, 09:12 PM
20. ### 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...

• Replies: 1
• Views: 2,345
08-21-2008, 01:23 PM
21. ### 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...

• Replies: 2
• Views: 2,355
08-21-2008, 12:36 PM
22. ### 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...

• Replies: 1
• Views: 3,129
08-20-2008, 04:06 PM
23. ### 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...

• Replies: 2
• Views: 9,270
08-19-2008, 10:32 PM
24. ### 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?...

• Replies: 3
• Views: 4,821
08-18-2008, 12:07 PM
25. ### 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...

• Replies: 0
• Views: 2,591
08-18-2008, 03:29 AM
26. ### 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...

• Replies: 2
• Views: 19,063
08-10-2008, 08:16 PM
27. ### 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...

• Replies: 3
• Views: 4,605
08-05-2008, 02:00 PM
28. ### 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...

• Replies: 2
• Views: 2,865
08-04-2008, 11:28 PM
29. ### 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...

• Replies: 4
• Views: 2,857
08-04-2008, 10:43 AM
30. ### 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...

• Replies: 4
• Views: 5,377
08-03-2008, 06:52 PM
31. ### 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...

• Replies: 0
• Views: 2,544
08-03-2008, 11:23 AM
32. ### finding quantiles

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

• Replies: 5
• Views: 7,466
07-31-2008, 04:08 PM
33. ### 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...

• Replies: 2
• Views: 6,798
07-29-2008, 12:15 PM
34. ### 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) ...

• Replies: 0
• Views: 2,942
07-28-2008, 05:28 AM
35. ### 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...

• Replies: 1
• Views: 2,197
07-26-2008, 10:26 PM
36. ### 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...

• Replies: 0
• Views: 10,741
07-25-2008, 08:59 AM
37. ### 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...

• Replies: 0
• Views: 3,780
07-24-2008, 10:33 PM
38. ### 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...

• Replies: 0
• Views: 9,661
07-18-2008, 01:04 PM
39. ### 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...

• Replies: 0
• Views: 3,368
07-14-2008, 07:46 AM
40. ### 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...

• Replies: 0
• Views: 3,127
07-09-2008, 09:53 AM
41. ### 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...

• Replies: 11
• Views: 7,007
07-01-2008, 01:58 PM
42. ### 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...

• Replies: 2
• Views: 3,940
06-29-2008, 08:07 AM
43. ### 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...

• Replies: 6
• Views: 3,616
06-27-2008, 05:47 AM
44. ### 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...

• Replies: 3
• Views: 8,617
06-26-2008, 03:15 AM
45. ### 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...

• Replies: 0
• Views: 3,032
06-24-2008, 10:44 AM
46. ### quantile regression vs. non-parametric curve fit of quantiles

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

• Replies: 0
• Views: 2,873
d^2
06-23-2008, 09:54 AM
47. ### 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...

• Replies: 7
• Views: 7,525
06-20-2008, 08:13 AM
48. ### 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...

• Replies: 0
• Views: 2,551
SPS
06-17-2008, 02:40 AM
49. ### 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? ...

• Replies: 0
• Views: 2,875
06-11-2008, 10:26 AM

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...

• Replies: 4
• Views: 3,242
06-03-2008, 07:20 PM
51. ### 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...

• Replies: 0
• Views: 2,856
05-24-2008, 11:20 AM
52. ### 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...

• Replies: 8
• Views: 14,901
05-23-2008, 08:33 AM
53. ### 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...

• Replies: 1
• Views: 4,020
05-01-2008, 11:08 AM
54. ### 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...

• Replies: 1
• Views: 2,277
04-24-2008, 08:37 AM
55. ### 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...

• Replies: 0
• Views: 3,439
04-11-2008, 05:31 AM
56. ### 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...

• Replies: 0
• Views: 2,738
02-04-2008, 12:50 PM

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