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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: 18,664
10-11-2014, 12:02 PM
1. ### A power analysis question - am I making a big mistake?

Help! It's a very long time since I have had to tackle Power Analysis but I have recently been handed a couple of problems, one of which I hope...

• Replies: 0
• Views: 2,206
01-01-2010, 05:36 PM
2. ### demographic stats for choosing where to live

Given the vast amount of demographic information on sites like: http://quickfacts.census.gov/qfd/index.html Could I could take a subset of...

• Replies: 2
• Views: 2,342
01-01-2010, 09:35 PM
3. ### Significance of Correspondence Analysis clusterings

Dear All, I would like to ask you about Correspondence Analysis. I am wondering if does any strategy exist to test the significance of the...

• Replies: 4
• Views: 4,599
01-03-2010, 02:27 AM
4. ### Stats for whole population data

Hi all - I'm an employee of a government department who has been asked to answer some question to do with a whole population data set. In short, here...

• Replies: 8
• Views: 6,961
01-04-2010, 11:13 AM
5. ### Garch fitting when some of the data might be inaccurate

Can anyone guide me to any newbie-ish literature on how to fit garch parameters (for example in Garch 1,1) to data where a small percentage of...

• Replies: 0
• Views: 2,627
01-11-2010, 10:53 AM
6. ### repeated measurements

Hi there, I am struggling to understand the way we analyze longitudinal data and I've gone through the net and some books but still have some...

• Replies: 0
• Views: 2,819
01-14-2010, 10:29 AM
7. ### Full factorial design

I have the followinf situation for a full factorial design. Estimated Effects and Coefficients ________t____ p-value...

• Replies: 0
• Views: 3,324
01-19-2010, 08:14 AM
8. ### ANOVA Assumptions for Percentages

I am trying to analyze land use data (e.g. an given area is made up of 14% residential land, 36% agricultural land, and 50% forested land). So the...

• Replies: 1
• Views: 9,688
01-29-2010, 10:30 PM
9. ### probability inequality

Let X be a random variable such that |X|<=C (bounded). Let f be an even, non decreasing function over the positive values of x. Prove that: /f(C)...

• Replies: 4
• Views: 2,596
02-06-2010, 05:53 PM
10. ### Exogenous and Endogenous Variables

How can you identify exogenous and endogenous variables from a chart that uses arrows and slings?

• Replies: 1
• Views: 4,217
02-12-2010, 03:17 AM
11. ### Advice for analyzing a small sample

I am currently working on my doctoral thesis in computer science and I have data from an experiment that I want to analyze, but I don't want to run...

• Replies: 5
• Views: 5,721
02-18-2010, 10:39 PM
12. ### Design Resolution

As a matter of definition, do all factorial designs have resolutions? Sometimes, designs have factors in a +/- table in which none of the factors is...

• Replies: 0
• Views: 1,814
02-21-2010, 12:17 PM
13. ### Marginal Effects

I know how to run marginal effects on STATA, but was never taught the theory behind them. Working through a textbook that I'm thinking of adopting...

• Replies: 0
• Views: 4,270
02-28-2010, 07:42 PM
14. ### PCSE vs FGLS method for analyzing panel data

Hi, Some guidance on the below inquiry would be much appreciated as I am having a hard time finding someone who is faimiliar with the PCSE and...

• Replies: 0
• Views: 6,714
03-02-2010, 04:44 PM
15. ### nearest neighbor

I am trying to understand some paper. In there author has the sample of 140 observations with respective x and y for coordinates. He then proceeds...

• Replies: 1
• Views: 2,815
03-04-2010, 12:32 PM
16. ### need a little hint..... Rosenberg measure of self esteem

Hey everyone, I am not the most statistacally minded person so please talk to me like you would to a 4 year old :eek: I am conducting a study...

• Replies: 3
• Views: 2,705
03-07-2010, 10:58 AM
17. ### Stochastic digraph/motion model switching question

Am deleting this post due to a lack of response. Sad forum...

• Replies: 1
• Views: 2,488
Nav
03-12-2010, 06:15 AM
18. ### Suggestions on Testing of Related Factors

I am designing an experiment that measures the performance of a computer-based system as the response. The response will be measured by how long it...

• Replies: 3
• Views: 2,313
03-14-2010, 11:48 AM
19. ### Percent Change

What should I put for the % change if the beginning value is 0 and the final value is >0, other than "not applicable"?

• Replies: 2
• Views: 4,447
03-16-2010, 01:38 AM
20. ### Problems for ordinary least squares and ridge solutions

I am confused with these two methods. Fox example, Suppose p ≫ n (many more predictor variables than observations), I have a design matrix X and...

• Replies: 1
• Views: 3,530
03-16-2010, 01:51 AM
21. ### Partial vs. Full Likelihoods

Hello, When fitting a proportional hazards model with time-dependent covariates for the transition intensities of a Markov chain, it seems that...

• Replies: 0
• Views: 2,148
TMR
03-17-2010, 01:13 PM
22. ### Choosing a model for categorical data

Hi all, I'm not very familiar with working with categorical data. I would like to model a categorical response variable (nominal, three levels) as a...

• Replies: 2
• Views: 2,633
03-17-2010, 03:59 PM
23. ### Generating correlated binary data

Suppose I have a column of random binary numbers. I would like to find a way to generate a second column with the same number of cases that has a...

• Replies: 2
• Views: 3,406
03-19-2010, 06:31 PM

:eek: Please any kind person help, as I am horribly stuck!!! I have a *very* large dataset (n>300,000 rows) of water readings in this format; ...

• Replies: 2
• Views: 2,185
03-23-2010, 10:43 PM
25. ### Random no, mle,method of moments

Hi. 1. I generate a random sample x=(x1,…,xn) of size n from dist A with parameters (a1,a2) in R. 2. I have a likelihood function which involves...

• Replies: 6
• Views: 3,331
03-24-2010, 06:06 AM
26. ### Post hoc test

I want to run a post hoc test along with my MANOVA, but I don't know which post hoc test to run. I am looking at the difference in prey preference...

• Replies: 1
• Views: 3,015
03-25-2010, 04:24 AM
27. ### Converting 1 Distribution to Another

I have a set of values ranging from .01 to 918 with n = 7368. About 3000 values are below 1 and about 150 values are greater than 100. The mean and...

• Replies: 5
• Views: 4,494
03-26-2010, 12:50 PM
28. ### Hypothesis on spousal mortality

************x

• Replies: 1
• Views: 2,290
03-27-2010, 10:24 PM
29. ### comparing directions on the sphere

Hello everyone, I am trying to compare two directions on the unit sphere, given two estimated mean directions a and b and their covariance...

• Replies: 0
• Views: 1,743
03-29-2010, 03:05 AM
30. ### Statistical test needed (not a homework problem)

I do actual research in Physics. My question is how do I compare two random vectors - do the measurements come from the same underlying process or...

• Replies: 1
• Views: 2,202
03-30-2010, 12:49 AM
31. ### Is multiple regression the method I should use?

Hello everyone, I'm working on my undergrad dissertation at the moment, and I'm not sure what kind of method I should use to analyse my data. I've...

• Replies: 0
• Views: 1,800
03-30-2010, 01:43 PM
32. ### How to run random effect model on spss? or anyother soft.

Hi, I have estimated a fixed effect model from a panel of time series data. I need now to estimate a random effect model? Please any help...

• Replies: 0
• Views: 2,796
03-30-2010, 01:45 PM
33. ### Data collection gone awry -- now what do I do?

Trying to keep this as brief as possible ... I handle the stats for a pilot project for my employer (a government agency). We're trying to...

• Replies: 0
• Views: 2,342
03-30-2010, 02:21 PM
34. ### Data Groveling

I am in the market for biomedical assay data that has lower detection limits and preferably be longitudinal. Someone asked me to find some...

• Replies: 0
• Views: 1,836
04-01-2010, 06:05 PM
35. ### how to find the UMVUE of the location parameter under t distribution

f(x;\theta)={{\Gamma({{v+1}\over2})}\over{\Gamma({v\over2})\sqrt{\pi v}}}\Big(1+\frac{(x-\theta)^2}{v}\Big)^{-\frac{v+1}{2}} , v>=3 i have no...

• Replies: 7
• Views: 5,952
04-04-2010, 09:05 AM
36. ### How to prove the UMVUE under these conditions

Hi everyone, the question is Let \mathbb{U} be the set of all unbiased estimators of 0. Namely, \mathbb{U}={U(X):...

• Replies: 3
• Views: 3,195
04-06-2010, 12:00 PM
37. ### Transition matrix of a Markov chain with a given limiting distrubuti

I want to create a transition matrix P (e.g. 4x4) for a stationary Markov chain with a given limiting distribution p, but I want P to bear as much...

• Replies: 1
• Views: 4,237
04-08-2010, 08:44 PM
38. ### Research for Student help please

Hello all, I have to do a research report for part on my access course before degree in Sep. I have decided to study the effects of poverty...

• Replies: 2
• Views: 2,863
04-09-2010, 09:40 AM
39. ### How to find out the specific association of a particular age bracket to a particular

If I have a table (mXn) that contains the rows of age brackets (like 25-35 years, 35-45 years, 46-60 years) and three columns of low stress, medium...

• Replies: 7
• Views: 3,622
04-10-2010, 10:15 AM
40. ### how to measure love/hate

Any idea about how can one develop a scale (Likert) to measure concepts like love, liking, hate etc towards some prominent leaders from certain...

• Replies: 4
• Views: 5,581
04-13-2010, 01:27 PM
41. ### ANOVA on the sampling distribution instead !

I am comparing 7 different types of stochastic algorithms. Each algorithm's performance is represented by a value (called the COST). The lower the...

• Replies: 0
• Views: 2,864
04-14-2010, 02:29 PM
42. ### Converge question (CLT ?)

hi, the question is: Let X_1, X_2, ... be i.i.d. standard normal random variables. Prove that (X_1+X_2+...+X_n)\over\sqrt{n}does not converge in...

• Replies: 0
• Views: 1,651
04-15-2010, 05:21 AM
43. ### eye beams

A person knows when they are being watched. Has anyone confirmed this effect to some level of significance? If so, is "it" detectible using...

• Replies: 0
• Views: 2,054
04-15-2010, 08:31 AM
44. ### Number of IVs for Mahalanobis

Does the number of IVs that I place in my regression to calculate Mahalanobis Distance affect the probability of a particular case as being a...

• Replies: 0
• Views: 2,241
04-17-2010, 08:33 PM
45. ### P values, z scores, 1 and 2 tailed tests... CONFUSED

Okay, I am completely clueless when it comes to statistics, but I'm trying to figure out this stuff for grad school and I've hit a snag that I just...

• Replies: 1
• Views: 7,359
04-27-2010, 01:22 PM
46. ### Help with repeated measure analysis.

Hi there, I am confused in how to analyze a set of experimental data. I consulted a number of books and did extensive research on the net, but could...

• Replies: 0
• Views: 2,729
04-28-2010, 04:02 AM
47. ### Weakness of Generalized Least Square?

My question is: What is the main weakness of the XTGLS command in STATA? And what are primary weaknesses of any GLS procedure? This is a kind of...

• Replies: 0
• Views: 2,175
04-30-2010, 03:46 AM
48. ### Multinomial Logistic Regression

Does anyone knows how I can formulate a the link function of a multinomial logistic regression without using a base class teotjunk

• Replies: 2
• Views: 3,606
05-07-2010, 05:57 PM
49. ### God you people are clever!

Hi, :wave: I'm collecting data from a single group of 15 participants showing their improvement in a 5 stage levelled test before and after an...

• Replies: 5
• Views: 5,043
05-08-2010, 12:52 AM
50. ### Homogenity and Heterogenity

Hello everyone. I have read that Homogenity and Heterogenity are used for population that have/do not have accordingly the same variance σ^2. Does...

• Replies: 1
• Views: 2,686
05-08-2010, 01:09 AM
51. ### Expected Value

A list of n items is arranged in random order; to find a requested item, they are searched sequentially until the desired item is found. So, how will...

• Replies: 9
• Views: 6,796
05-08-2010, 05:29 AM
52. ### chi test duplication from a research

Exactly what i need. I need to duplicate a research and get their same answers using a 2 prop z test or chi test and i'm having issues... can't go on...

• Replies: 1
• Views: 2,054
05-09-2010, 07:50 PM
53. ### Websites on designing scientific posters

I have to do a poster presentation in a few weeks and I'm looking for some good sites that might give some advice on designing scientific posters,...

• Replies: 5
• Views: 16,109
05-11-2010, 02:08 AM
54. ### Adding Random Variables from Logistic Distributions

Given two logistic distributed random variable: ( mu_1, s_1 ) and ( mu_2, s_2 ) what is the sum of the variable? I tried monte carlo on (...

• Replies: 2
• Views: 8,172
05-13-2010, 04:36 PM
55. ### [Help] What is the statistical formula applied in this problem?

Stat/Math wizs, if you could kindly shine your beacon on this problem. I'm running some statistics using a clustering algorithm and it classified...

• Replies: 2
• Views: 2,158
05-14-2010, 11:15 PM
56. ### S.t.d Calculation of different populations

Hello. I have n different populations with their means and their standard deviations. All these different populations follow the Gaussian...

• Replies: 5
• Views: 3,217
05-18-2010, 08:36 AM

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