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# 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: 18,750
10-11-2014, 12:02 PM
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...

• Replies: 0
• Views: 3,590
04-09-2006, 03:44 PM
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...

• Replies: 0
• Views: 2,297
01-08-2007, 09:17 PM
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...

• Replies: 0
• Views: 2,473
06-13-2007, 09:07 AM
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...

• Replies: 0
• Views: 2,759
02-04-2008, 12:50 PM
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...

• Replies: 0
• Views: 3,484
04-11-2008, 05:31 AM
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...

• Replies: 0
• Views: 2,897
05-24-2008, 11:20 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: 2,900
06-11-2008, 10:26 AM
8. ### 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: 2,570
SPS
06-17-2008, 02:40 AM
9. ### 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: 2,893
d^2
06-23-2008, 09:54 AM
10. ### 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: 3,049
06-24-2008, 10:44 AM
11. ### 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: 3,154
07-09-2008, 09:53 AM
12. ### 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: 3,392
07-14-2008, 07:46 AM
13. ### 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: 9,729
07-18-2008, 01:04 PM
14. ### 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: 3,796
07-24-2008, 10:33 PM
15. ### 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: 10,801
07-25-2008, 08:59 AM
16. ### 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: 2,974
07-28-2008, 05:28 AM
17. ### 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: 2,570
08-03-2008, 11:23 AM
18. ### 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: 2,623
08-18-2008, 03:29 AM
19. ### 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: 2,185
08-27-2008, 10:06 PM
20. ### 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: 2,449
09-10-2008, 08:30 AM
21. ### 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: 4,006
09-10-2008, 12:41 PM
22. ### 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: 4,501
09-11-2008, 09:42 AM
23. ### 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...

• Replies: 0
• Views: 2,449
10-06-2008, 01:00 AM
24. ### 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. ...

• Replies: 0
• Views: 2,452
10-10-2008, 04:50 AM
25. ### 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...

• Replies: 0
• Views: 3,384
10-13-2008, 12:29 PM
26. ### 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...

• Replies: 0
• Views: 3,153
10-13-2008, 03:09 PM
27. ### 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...

• Replies: 0
• Views: 5,036
10-19-2008, 06:35 AM
28. ### 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....

• Replies: 0
• Views: 3,204
10-30-2008, 07:44 AM

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...

• Replies: 0
• Views: 2,265
11-17-2008, 12:18 AM
30. ### 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...

• Replies: 0
• Views: 2,101
11-18-2008, 10:13 AM
31. ### 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...

• Replies: 0
• Views: 2,105
11-19-2008, 08:47 PM
32. ### 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...

• Replies: 0
• Views: 3,537
11-26-2008, 09:34 AM
33. ### 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...

• Replies: 0
• Views: 4,448
11-26-2008, 09:49 AM
34. ### 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. ...

• Replies: 0
• Views: 2,156
12-01-2008, 10:57 AM
35. ### 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...

• Replies: 0
• Views: 2,786
12-08-2008, 07:41 AM
36. ### 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...

• Replies: 0
• Views: 2,187
SML
12-18-2008, 02:00 PM
37. ### "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...

• Replies: 0
• Views: 2,163
12-20-2008, 08:16 PM
38. ### 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...

• Replies: 0
• Views: 4,109
01-10-2009, 07:31 PM
39. ### 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...

• Replies: 0
• Views: 5,240
01-12-2009, 04:15 PM
40. ### 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...

• Replies: 0
• Views: 4,335
01-14-2009, 04:15 PM
41. ### 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) +...

• Replies: 0
• Views: 3,031
SVM
01-17-2009, 11:22 PM
42. ### 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...

• Replies: 0
• Views: 3,572
01-19-2009, 12:19 AM
43. ### 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...

• Replies: 0
• Views: 2,325
01-20-2009, 03:07 AM
44. ### 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...

• Replies: 0
• Views: 2,399
02-09-2009, 11:06 PM
45. ### 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...

• Replies: 0
• Views: 2,476
02-11-2009, 10:27 AM
46. ### 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...

• Replies: 0
• Views: 4,289
02-20-2009, 02:54 AM
47. ### 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...

• Replies: 0
• Views: 5,268
02-21-2009, 01:38 PM
48. ### Videopods

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

• Replies: 0
• Views: 2,113
02-25-2009, 12:15 PM
49. ### 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...

• Replies: 0
• Views: 2,445
03-06-2009, 04:22 PM
50. ### 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...

• Replies: 0
• Views: 2,573
03-07-2009, 10:56 AM
51. ### 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...

• Replies: 0
• Views: 2,435
03-08-2009, 03:38 AM
52. ### 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...

• Replies: 0
• Views: 1,823
03-07-2009, 08:35 PM
53. ### 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....

• Replies: 0
• Views: 2,191
03-12-2009, 02:02 AM
54. ### Testing for Developmental Significance

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

• Replies: 0
• Views: 2,313
03-16-2009, 02:46 PM
55. ### 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...

• Replies: 0
• Views: 3,142
03-20-2009, 04:19 PM
56. ### 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!

• Replies: 0
• Views: 3,515
03-23-2009, 06:18 PM

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