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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: 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: 19,435
10-11-2014, 12:02 PM
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...

• Replies: 6
• Views: 3,764
06-27-2008, 05:47 AM
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...

• Replies: 3
• Views: 8,879
06-26-2008, 03:15 AM
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...

• Replies: 0
• Views: 3,175
06-24-2008, 10:44 AM
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:...

• Replies: 0
• Views: 2,979
d^2
06-23-2008, 09:54 AM
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...

• Replies: 7
• Views: 7,677
06-20-2008, 08:13 AM
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...

• Replies: 0
• Views: 2,689
SPS
06-17-2008, 02:40 AM
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? ...

• Replies: 0
• Views: 2,985
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: 3,370
06-03-2008, 07:20 PM
9. ### 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: 3,042
05-24-2008, 11:20 AM
10. ### 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: 15,338
05-23-2008, 08:33 AM
11. ### 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: 4,181
05-01-2008, 11:08 AM
12. ### 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: 2,373
04-24-2008, 08:37 AM
13. ### 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: 3,747
04-11-2008, 05:31 AM
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...

• Replies: 0
• Views: 2,862
02-04-2008, 12:50 PM
15. ### 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...

• Replies: 1
• Views: 2,731
01-12-2008, 10:19 AM
16. ### 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...

• Replies: 3
• Views: 3,152
10-11-2007, 11:30 AM
17. ### 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....

• Replies: 8
• Views: 8,130
08-27-2007, 04:38 AM
18. ### 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...

• Replies: 4
• Views: 3,483
06-15-2007, 01:34 PM
19. ### 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...

• Replies: 0
• Views: 2,556
06-13-2007, 09:07 AM
20. ### 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...

• Replies: 1
• Views: 3,170
05-30-2007, 12:02 AM
21. ### 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...

• Replies: 0
• Views: 2,363
01-08-2007, 09:17 PM
22. ### 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...

• Replies: 4
• Views: 3,205
11-19-2006, 03:33 PM
23. ### 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,...

• Replies: 1
• Views: 2,684
09-08-2006, 08:32 PM
24. ### 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...

• Replies: 0
• Views: 3,727
04-09-2006, 03:44 PM
25. ### 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...

• Replies: 1
• Views: 5,905
03-24-2006, 03:02 PM
26. ### 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...

• Replies: 1
• Views: 6,732
02-18-2006, 02:27 PM
27. ### 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...

• Replies: 11
• Views: 4,779
12-14-2005, 05:55 PM

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