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Forum: Statistical Research

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

  1. Sticky Thread 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...

    Started by Englund‎, 01-18-2014 04:56 AM
    • Replies: 14
    • Views: 18,625
    10-11-2014, 12:02 PM Go to last post
  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...

    Started by WeeG‎, 06-02-2010 11:51 AM
    • Replies: 1
    • Views: 3,978
    06-02-2010, 11:59 AM Go to last post
  2. Question 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...

    Started by pandre‎, 05-25-2010 04:51 AM
    • Replies: 1
    • Views: 3,135
    06-01-2010, 09:10 AM Go to last post
  3. Cool multinomial score

    I am struggling with getting a result from McCullagh & Nelder 1989 GLM on p. 171 they show the derivative of the likelihood to be what is shown...

    Started by stephenb‎, 05-31-2010 10:42 AM
    • Replies: 0
    • Views: 2,162
    05-31-2010, 10:42 AM Go to last post
  4. Smile 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...

    Started by Marte‎, 05-30-2010 01:37 PM
    • Replies: 3
    • Views: 2,485
    05-31-2010, 08:03 AM Go to last post
  5. 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...

    Started by felixcollins‎, 05-17-2010 11:37 PM
    • Replies: 2
    • Views: 6,017
    05-30-2010, 09:49 PM Go to last post
  6. 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...

    Started by Tiffy‎, 05-27-2010 05:53 AM
    • Replies: 3
    • Views: 2,649
    05-28-2010, 08:10 AM Go to last post
  7. 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...

    Started by fajo‎, 05-25-2010 07:57 AM
    • Replies: 0
    • Views: 2,484
    05-25-2010, 07:57 AM Go to last post
  8. 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...

    Started by leo nidas‎, 05-23-2010 05:01 PM
    • Replies: 0
    • Views: 2,029
    05-23-2010, 05:01 PM Go to last post
  9. 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...

    Started by RuthH‎, 05-02-2010 08:37 AM
    • Replies: 1
    • Views: 2,625
    05-23-2010, 10:28 AM Go to last post
  10. 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...

    Started by Adrian‎, 05-21-2010 11:19 AM
    • Replies: 2
    • Views: 2,079
    05-21-2010, 12:46 PM Go to last post
  11. 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 ...

    Started by Flatnose‎, 05-15-2010 06:25 AM
    • Replies: 2
    • Views: 2,474
    05-20-2010, 08:07 AM Go to last post
  12. 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...

    Started by Alicia2010‎, 05-20-2010 03:59 AM
    • Replies: 0
    • Views: 4,145
    05-20-2010, 03:59 AM Go to last post
  13. 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...

    Started by dervast‎, 05-13-2010 11:16 AM
    • Replies: 5
    • Views: 3,212
    05-18-2010, 08:36 AM Go to last post
  14. [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...

    Started by psynpsyn‎, 05-13-2010 02:48 AM
    • Replies: 2
    • Views: 2,152
    05-14-2010, 11:15 PM Go to last post
  15. 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 (...

    Started by JoeyM‎, 05-12-2010 03:31 PM
    • Replies: 2
    • Views: 8,161
    05-13-2010, 04:36 PM Go to last post
  16. 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,...

    Started by freebird2008‎, 02-23-2010 03:15 PM
    • Replies: 5
    • Views: 16,091
    05-11-2010, 02:08 AM Go to last post
  17. 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...

    Started by saraservis‎, 05-09-2010 10:14 AM
    • Replies: 1
    • Views: 2,048
    05-09-2010, 07:50 PM Go to last post
  18. 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...

    Started by SmileAli‎, 05-07-2010 06:37 PM
    • Replies: 9
    • Views: 6,782
    05-08-2010, 05:29 AM Go to last post
  19. 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...

    Started by dervast‎, 05-06-2010 10:29 AM
    • Replies: 1
    • Views: 2,684
    05-08-2010, 01:09 AM Go to last post
  20. Exclamation 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...

    Started by help me!‎, 01-05-2010 02:30 PM
    • Replies: 5
    • Views: 5,039
    05-08-2010, 12:52 AM Go to last post
  21. 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

    Started by teotjunk‎, 05-05-2010 06:12 AM
    • Replies: 2
    • Views: 3,599
    05-07-2010, 05:57 PM Go to last post
  22. Post Really really need your help! Im lost!

    Posted this before but got no response and the project deadline is only a few days away and my tutor cant meet with me at all PLEASE HELP!!! Hi...

    Started by CatherineAnn1089‎, 05-04-2010 04:09 AM
    • Replies: 0
    • Views: 2,444
    05-04-2010, 04:09 AM Go to last post
  23. Central Limit Theorem

    Hi guys, According to the central limit theorem, if I have a sample of n independent variables X1,....Xn, from ANY distribution, the sample mean...

    Started by WeeG‎, 05-03-2010 02:20 AM
    • Replies: 1
    • Views: 3,226
    05-03-2010, 06:51 AM Go to last post
  24. Question 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...

    Started by non-sleeper‎, 04-30-2010 03:46 AM
    • Replies: 0
    • Views: 2,168
    04-30-2010, 03:46 AM Go to last post
  25. 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...

    Started by lafcina‎, 04-28-2010 04:02 AM
    • Replies: 0
    • Views: 2,714
    04-28-2010, 04:02 AM Go to last post
  26. 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...

    Started by theoutsyder83‎, 04-26-2010 09:31 AM
    • Replies: 1
    • Views: 7,342
    04-27-2010, 01:22 PM Go to last post
  27. Interpretation of Multinomial Regression Output

    Hi I have attached the output of a Multinomial Regression.I have taken referrence group as 4 for the variable next_Cur_Cust_Segment_LVL_2. ...

    Started by stata‎, 04-20-2010 09:32 AM
    • Replies: 0
    • Views: 4,531
    04-20-2010, 09:32 AM Go to last post
  28. 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...

    Started by stephonomon‎, 04-17-2010 08:33 PM
    • Replies: 0
    • Views: 2,233
    04-17-2010, 08:33 PM Go to last post
  29. Red face Analyzing factor scores from principal components analysis

    Hoping someone can help - I performed a PCA (using SPSS 18 Gradpack) on 10 variables (all measured on a scale of 0-10). Cases are individual...

    Started by careerstudent‎, 04-14-2010 06:34 PM
    • Replies: 6
    • Views: 5,612
    04-17-2010, 02:45 PM Go to last post
  30. 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...

    Started by Outlier‎, 04-15-2010 08:31 AM
    • Replies: 0
    • Views: 2,045
    04-15-2010, 08:31 AM Go to last post
  31. 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...

    Started by egpivo‎, 04-15-2010 05:21 AM
    • Replies: 0
    • Views: 1,648
    04-15-2010, 05:21 AM Go to last post
  32. 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...

    Started by marvinb‎, 04-14-2010 02:29 PM
    • Replies: 0
    • Views: 2,851
    04-14-2010, 02:29 PM Go to last post
  33. 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...

    Started by Dr.Appalayya‎, 01-22-2010 01:02 AM
    • Replies: 4
    • Views: 5,574
    04-13-2010, 01:27 PM Go to last post
  34. 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...

    Started by Dr.Appalayya‎, 04-06-2010 03:54 AM
    • Replies: 7
    • Views: 3,610
    04-10-2010, 10:15 AM Go to last post
  35. 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...

    Started by Urban Colour‎, 04-09-2010 07:45 AM
    • Replies: 2
    • Views: 2,851
    04-09-2010, 09:40 AM Go to last post
  36. 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...

    Started by efl86‎, 01-08-2010 12:41 PM
    • Replies: 1
    • Views: 4,234
    04-08-2010, 08:44 PM Go to last post
  37. 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):...

    Started by egpivo‎, 04-05-2010 07:54 AM
    • Replies: 3
    • Views: 3,187
    04-06-2010, 12:00 PM Go to last post
  38. 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...

    Started by egpivo‎, 04-03-2010 01:10 AM
    • Replies: 7
    • Views: 5,942
    04-04-2010, 09:05 AM Go to last post
  39. 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...

    Started by fed1‎, 04-01-2010 06:05 PM
    • Replies: 0
    • Views: 1,835
    04-01-2010, 06:05 PM Go to last post
  40. 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...

    Started by Berley‎, 03-30-2010 02:21 PM
    • Replies: 0
    • Views: 2,333
    03-30-2010, 02:21 PM Go to last post
  41. 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...

    Started by tantan‎, 03-30-2010 01:45 PM
    • Replies: 0
    • Views: 2,795
    03-30-2010, 01:45 PM Go to last post
  42. Talking 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...

    Started by savocado‎, 03-30-2010 01:43 PM
    • Replies: 0
    • Views: 1,800
    03-30-2010, 01:43 PM Go to last post
  43. 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...

    Started by sumdumguy‎, 03-27-2010 09:22 PM
    • Replies: 1
    • Views: 2,198
    03-30-2010, 12:49 AM Go to last post
  44. 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...

    Started by LauraMuffin‎, 03-29-2010 03:05 AM
    • Replies: 0
    • Views: 1,741
    03-29-2010, 03:05 AM Go to last post
  45. Hypothesis on spousal mortality

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

    Started by Outlier‎, 03-14-2010 04:59 PM
    • Replies: 1
    • Views: 2,288
    03-27-2010, 10:24 PM Go to last post
  46. 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...

    Started by zeloc‎, 03-06-2010 12:51 PM
    • Replies: 5
    • Views: 4,484
    03-26-2010, 12:50 PM Go to last post
  47. 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...

    Started by astuczka‎, 03-24-2010 07:32 PM
    • Replies: 1
    • Views: 3,010
    03-25-2010, 04:24 AM Go to last post
  48. 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...

    Started by tsukiko‎, 03-23-2010 03:42 AM
    • Replies: 6
    • Views: 3,328
    03-24-2010, 06:06 AM Go to last post
  49. Don't know where to start, please help

    :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; ...

    Started by heather_s‎, 03-23-2010 12:30 AM
    • Replies: 2
    • Views: 2,182
    03-23-2010, 10:43 PM Go to last post
  50. 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...

    Started by JEHP1846‎, 03-19-2010 04:49 PM
    • Replies: 2
    • Views: 3,402
    03-19-2010, 06:31 PM Go to last post
  51. 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...

    Started by Heidi Swanson‎, 03-09-2010 05:20 PM
    • Replies: 2
    • Views: 2,631
    03-17-2010, 03:59 PM Go to last post
  52. 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...

    Started by TMR‎, 03-17-2010 01:13 PM
    • Replies: 0
    • Views: 2,146
    03-17-2010, 01:13 PM Go to last post
  53. Question 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...

    Started by tx1988‎, 03-16-2010 01:27 AM
    • Replies: 1
    • Views: 3,525
    03-16-2010, 01:51 AM Go to last post
  54. 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"?

    Started by yu78zer1‎, 03-08-2010 03:37 AM
    • Replies: 2
    • Views: 4,441
    03-16-2010, 01:38 AM Go to last post
  55. 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...

    Started by jalanthomas‎, 03-13-2010 09:04 PM
    • Replies: 3
    • Views: 2,311
    03-14-2010, 11:48 AM Go to last post
  56. Stochastic digraph/motion model switching question

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

    Started by Nav‎, 03-10-2010 05:30 AM
    • Replies: 1
    • Views: 2,485
    03-12-2010, 06:15 AM Go to last post
  57. 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...

    Started by Thesis12‎, 02-05-2010 05:24 PM
    • Replies: 3
    • Views: 2,697
    03-07-2010, 10:58 AM Go to last post
  58. 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...

    Started by jenya56‎, 03-03-2010 10:31 PM
    • Replies: 1
    • Views: 2,809
    03-04-2010, 12:32 PM Go to last post
  59. 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...

    Started by jlind135‎, 03-02-2010 04:44 PM
    • Replies: 0
    • Views: 6,697
    03-02-2010, 04:44 PM Go to last post
  60. 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...

    Started by wjm15‎, 02-28-2010 07:42 PM
    • Replies: 0
    • Views: 4,264
    02-28-2010, 07:42 PM Go to last post

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