1. Announcement:
05-10-2017
Views:
1,780
Page 48 of 54 First ... 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 Last
Threads 2821 to 2880 of 3192

# 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: 18,625
10-11-2014, 12:02 PM
1. ### sufficient statistic

Hi guys, I have a little question. I got a density function: f(x)=exp{-(x-\theta)} when \theta<X<infinity I need to find a sufficient...

• Replies: 1
• Views: 3,978
06-02-2010, 11:59 AM
2. ### Probability Density Function needed

I am looking for a continuous probability density function defined in the interval with the following properties: 1. If the mode is 0.5 then...

• Replies: 1
• Views: 3,135
06-01-2010, 09:10 AM
3. ### Sample

Consider we have a random sample (120 answers) and a convenience sample (80 answers) from the same population. Since the means of both samples are...

• Replies: 3
• Views: 2,485
05-31-2010, 08:03 AM
4. ### How to calculate variance on pooled data

I have an array of pairs. Each pair represents a "bin" in a range. Each pair stores a sum and a count. Data is added to a pair/bin by adding the...

• Replies: 2
• Views: 6,017
05-30-2010, 09:49 PM
5. ### Market research questionnaire re-design

Hi, I have a questionnaire which contains 91 questions, I need to take away roughly 10-20 of them due to cost reason. I was thinking to use Factor...

• Replies: 3
• Views: 2,649
05-28-2010, 08:10 AM
6. ### predictive analysis algorithm

Hi, What will be the best algorithms to use in case of predicting a large set of web data. mainly there will be 3 ,4 variables with which i want...

• Replies: 0
• Views: 2,484
05-25-2010, 07:57 AM
7. ### gee longitudinal

Hi there, I goin crazy with GEE and longitudianl data. I've studied the algorithm in many books and I am sure that I understand it and try to...

• Replies: 0
• Views: 2,029
05-23-2010, 05:01 PM
8. ### pearsons versus spearmans

Hi I have a very common but somehow still confusing question regarding correct correlation to use when addressing the relationship between two...

• Replies: 1
• Views: 2,625
05-23-2010, 10:28 AM
9. ### Grouping distributions together based on significance

Hi, all: My PhD research has wandered into an area that requires more statistical analysis than I am currently comfortable with, and so I'm...

• Replies: 2
• Views: 2,079
05-21-2010, 12:46 PM
10. ### Model Suggestions?

Hello Stat experts - I'm hoping to find some inspiration in a project I'm doing. I have some longitudinal data, 15 series of measurements ...

• Replies: 2
• Views: 2,474
05-20-2010, 08:07 AM
11. ### GOF / Diagnostics for a GLM Binomial-Logit Family Model STATA

Hello, I am using a GLM Binomial-Logit Family Model. I am using this model because my dependent variable is a proportion. Having carried out the...

• Replies: 0
• Views: 4,145
05-20-2010, 03:59 AM
12. ### 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: 3,212
05-18-2010, 08:36 AM
13. ### [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: 2,152
05-14-2010, 11:15 PM
14. ### 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: 8,161
05-13-2010, 04:36 PM
15. ### 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: 16,091
05-11-2010, 02:08 AM
16. ### 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: 2,048
05-09-2010, 07:50 PM
17. ### 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: 6,782
05-08-2010, 05:29 AM
18. ### 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: 2,684
05-08-2010, 01:09 AM
19. ### 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: 5,039
05-08-2010, 12:52 AM
20. ### 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: 3,599
05-07-2010, 05:57 PM
21. ### 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: 2,168
04-30-2010, 03:46 AM
22. ### 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: 2,714
04-28-2010, 04:02 AM
23. ### 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: 7,342
04-27-2010, 01:22 PM
24. ### 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: 2,233
04-17-2010, 08:33 PM
25. ### 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: 2,045
04-15-2010, 08:31 AM
26. ### 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: 1,648
04-15-2010, 05:21 AM
27. ### 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: 2,851
04-14-2010, 02:29 PM
28. ### 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: 5,574
04-13-2010, 01:27 PM
29. ### 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: 3,610
04-10-2010, 10:15 AM
30. ### 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: 2,851
04-09-2010, 09:40 AM
31. ### 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: 4,234
04-08-2010, 08:44 PM
32. ### 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: 3,187
04-06-2010, 12:00 PM
33. ### 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: 5,942
04-04-2010, 09:05 AM
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: 1,835
04-01-2010, 06:05 PM
35. ### 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: 2,333
03-30-2010, 02:21 PM
36. ### 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: 2,795
03-30-2010, 01:45 PM
37. ### 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
38. ### 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: 2,198
03-30-2010, 12:49 AM
39. ### 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: 1,741
03-29-2010, 03:05 AM
40. ### Hypothesis on spousal mortality

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

• Replies: 1
• Views: 2,288
03-27-2010, 10:24 PM
41. ### 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: 4,484
03-26-2010, 12:50 PM
42. ### 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: 3,010
03-25-2010, 04:24 AM
43. ### 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: 3,328
03-24-2010, 06:06 AM

: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: 2,182
03-23-2010, 10:43 PM
45. ### 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: 3,402
03-19-2010, 06:31 PM
46. ### 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: 2,631
03-17-2010, 03:59 PM
47. ### 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: 2,146
TMR
03-17-2010, 01:13 PM
48. ### 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: 3,525
03-16-2010, 01:51 AM
49. ### 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: 4,441
03-16-2010, 01:38 AM
50. ### 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: 2,311
03-14-2010, 11:48 AM
51. ### Stochastic digraph/motion model switching question

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

• Replies: 1
• Views: 2,485
Nav
03-12-2010, 06:15 AM
52. ### 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: 2,697
03-07-2010, 10:58 AM
53. ### 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: 2,809
03-04-2010, 12:32 PM
54. ### 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: 6,697
03-02-2010, 04:44 PM
55. ### 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: 4,264
02-28-2010, 07:42 PM

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.

#### Icon Legend

You have posted in this thread

#### Posting Permissions

• You may not post new threads
• You may not post replies
• You may not post attachments
• You may not edit your posts