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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: 18,683
    10-11-2014, 12:02 PM Go to last post
  1. 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...

    Started by Peskarik‎, 06-20-2008 04:39 PM
    • Replies: 3
    • Views: 8,624
    06-26-2008, 03:15 AM Go to last post
  2. Help needed - estimating effect size

    Hi everyone, I'd really appreciate any help/guidance in solving a little problem of mine. I need to know how to estimate an effect size...

    Started by that_guy_‎, 08-01-2008 12:13 PM
    • Replies: 3
    • Views: 4,618
    08-05-2008, 02:00 PM Go to last post
  3. Infinite divisibility under mixing - kernel density estimation

    Hi all, Can we consider a (multi-modal) kernel density estimate as a finite mixture of probabiliy distributions which would be infinite divisible?...

    Started by Cluster‎, 08-15-2008 12:15 PM
    • Replies: 3
    • Views: 4,829
    08-18-2008, 12:07 PM Go to last post
  4. doctoral research

    I would like help with posting and or and analylzing the results of mail surveys on collaboration onto SPSS.

    Started by gradstudent‎, 11-08-2008 10:56 PM
    • Replies: 3
    • Views: 2,579
    11-10-2008, 02:13 AM Go to last post
  5. How to model time-dependent covariate in random effect model?

    I am using a random effect model to examine the effect of several covariates on the outcome variable over time. Some of the covariates are...

    Started by nahh‎, 11-11-2008 11:08 PM
    • Replies: 3
    • Views: 9,778
    11-14-2008, 06:37 PM Go to last post
  6. Hypothesis design

    Hi, I have a question regarding hypothesis design. In other words, how to properly assign H0 and H1. For example, if I have statement: Some drug...

    Started by maxim333‎, 11-18-2008 09:00 AM
    • Replies: 3
    • Views: 3,301
    11-19-2008, 12:31 AM Go to last post
  7. Comparing Improvement Between Groups - Best Approach?

    Perhaps this is an easy issue, but I wanted to throw it out anyway. I'm working on a dataset where there are two groups, both having pre- and...

    Started by Barnzilla‎, 11-28-2008 09:58 AM
    • Replies: 3
    • Views: 4,034
    01-14-2009, 10:27 PM Go to last post
  8. Statistical Research Question

    Here is what I am looking at: I want to know how 3 factors (we'll call them A1, A2, A3) correlate with Store Sales per Store (532 stores). In...

    Started by vanna‎, 01-21-2009 12:38 PM
    • Replies: 3
    • Views: 3,432
    01-22-2009, 02:09 AM Go to last post
  9. Desperate urgent help

    Hi everybody, First, let me say how much I appreciate your help here. Its a life saver. I have a presentation tomorrow on my research and I am...

    Started by ruzbayhhi‎, 02-17-2009 07:00 AM
    • Replies: 3
    • Views: 2,705
    02-20-2009, 02:07 AM Go to last post
  10. How to model lagged correlation data?

    Suppose I have two time series data sets A and B. Calculating the correlation between the two I observe almose -80% correlation among A & B. My...

    Started by SVM‎, 03-08-2009 11:44 PM
    • Replies: 3
    • Views: 5,565
    03-19-2009, 12:07 AM Go to last post
  11. comparing two charts

    Hi, i am new in forum and i am an amateur in Statistics. I have two data sets of the same thing and i want to compare them. For example i have 20...

    Started by stathi02‎, 05-06-2009 11:12 AM
    • Replies: 3
    • Views: 2,829
    05-06-2009, 05:20 PM Go to last post
  12. Question Perception of non-parametric techniques as inferior?

    Hi guys, I've recently worked on a project supervised by a lecturer in the school of psychology at my university. She's been looking over the...

    Started by CowboyBear‎, 05-07-2009 02:55 AM
    • Replies: 3
    • Views: 9,554
    05-08-2009, 06:17 AM Go to last post
  13. ANOVA weighted means?

    Hi Chaps, I am trying to run a comparison between two groups - patients and staff - ratings of the quality of life on a ward. Simple enough,...

    Started by piblet‎, 06-05-2009 08:37 AM
    • Replies: 3
    • Views: 5,762
    06-05-2009, 12:15 PM Go to last post
  14. Why no international statistical testing?

    I am wondering why it's generally not done to conduct a statistical testing comparing prevalence rate between two different countries even they have...

    Started by Yellowknight888‎, 09-06-2009 04:15 PM
    • Replies: 3
    • Views: 2,385
    09-06-2009, 08:51 PM Go to last post
  15. which test to use?

    Hello everyone, Im a bit stuck as to which test i should be using for my analysis. i have collected the reaction times of 35 participants. There...

    Started by noclue‎, 09-15-2009 06:04 AM
    • Replies: 3
    • Views: 1,897
    09-15-2009, 07:33 AM Go to last post
  16. Tricky(?) sampling problem

    Hello all! I have a survey data set consisting of interview answers of different people. The people have been sampled with simple random sampling....

    Started by kmh‎, 09-26-2009 03:27 AM
    • Replies: 3
    • Views: 3,640
    09-27-2009, 02:33 PM Go to last post
  17. Estimating initial level after the treatment!

    Hi, Say I wanted to examine the effect of some treatment on a hormone level but I could not measure the pre-treatment level. Example, person runs...

    Started by PeterVincent‎, 10-09-2009 09:29 AM
    • Replies: 3
    • Views: 2,618
    10-09-2009, 11:46 AM Go to last post
  18. I'm Confused, simple question...

    Hello all. I was reading a friend's dissertation and came across something that left me a bit perplexed. In his study, he stated that there...

    Started by Tolstoy‎, 10-15-2009 01:13 PM
    • Replies: 3
    • Views: 2,787
    10-15-2009, 03:56 PM Go to last post
  19. Certain sample size needed for HLM?

    I have a data set of test scores and memory scores of 111 students, nested in 12 different classroom. 6 classrooms are from high income areas and 6...

    Started by MTT‎, 11-02-2009 02:44 PM
    • Replies: 3
    • Views: 17,290
    11-04-2009, 10:14 AM Go to last post
  20. Question attributes of individuals in discrete choice tasks

    Hello stat talkers, :wave: I'm currently working on a marketing (discrete choice) project concerning brand choice and I stumbled upon some questions...

    Started by alex.wendland‎, 11-16-2009 05:08 AM
    • Replies: 3
    • Views: 3,413
    11-23-2009, 04:23 AM Go to last post
  21. 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: 2,709
    03-07-2010, 10:58 AM Go to last post
  22. 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: 2,314
    03-14-2010, 11:48 AM Go to last post
  23. 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: 3,202
    04-06-2010, 12:00 PM Go to last post
  24. 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: 2,657
    05-28-2010, 08:10 AM Go to last post
  25. 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: 2,488
    05-31-2010, 08:03 AM Go to last post
  26. Regression Model

    wefwefwfweff

    Started by fhaquassho‎, 06-03-2010 06:07 PM
    • Replies: 3
    • Views: 3,882
    06-04-2010, 09:04 AM Go to last post
  27. Ranking advertisers based on performance

    Hi, let's say you run an ad network and you want to rank your advertisers based on their performance. Now what most networks do is simply...

    Started by FlashStats‎, 07-10-2010 10:22 AM
    • Replies: 3
    • Views: 2,882
    07-13-2010, 02:23 PM Go to last post
  28. Unhappy Choosing an appropriate Statistical Test

    Hi All, I'm new here - just wanted to ask you which statistical test I could use for the following case (thanks in advance!): Information: ...

    Started by uzymedphys‎, 08-14-2010 03:39 AM
    • Replies: 3
    • Views: 3,574
    12-06-2010, 11:36 PM Go to last post
  29. Using measures with different Likert-type scaling

    I need some advice regarding methodology. I am creating a single questionnaire comprised of 4 different measures - all with likert-type scaling. ...

    Started by Nebulous13‎, 08-15-2010 01:08 PM
    • Replies: 3
    • Views: 5,120
    08-19-2010, 12:28 AM Go to last post
  30. Exclamation Suggest an Unbiased estimator for θ

    Prove that the maximum of the random sample of size 'n' from uniform distribution over is a biased but a consistent estimator of θ. Suggest a n...

    Started by amul28‎, 08-19-2010 12:59 AM
    • Replies: 3
    • Views: 91,371
    08-19-2010, 03:49 AM Go to last post
  31. puzzling change in effect in multilevel linear regression; suppressor effect?

    In my analysis of educational achievement of second generation migrants, I modelled the effect of mother's and father's education in two ways, which...

    Started by Soporiferous‎, 09-02-2010 08:48 AM
    • Replies: 3
    • Views: 4,442
    09-09-2010, 05:56 AM Go to last post
  32. When do we use...

    just out of curiosity.... where is Mathematical Statistics, if at all, do we use modern algebra (i.e Groups, Rings,....) ?

    Started by WeeG‎, 09-11-2010 09:23 AM
    • Replies: 3
    • Views: 2,344
    09-11-2010, 10:33 AM Go to last post
  33. Red face Using likert scale data and nominal, ratio scale data for Partial Correlation

    Hi All, If Pearson correlation is used through Partial Correlation (on SPSS) for measuring variables measured on a Likert Scale, can we use...

    Started by sachitha‎, 10-04-2010 11:43 AM
    • Replies: 3
    • Views: 14,553
    10-07-2010, 08:03 PM Go to last post
  34. Calculating a sample size for a study

    Hi, I am trying to do a study on patients with a certain disease. I would like to retrospectively review their charts and check whether there were...

    Started by yr20045‎, 10-23-2010 02:34 PM
    • Replies: 3
    • Views: 2,830
    10-24-2010, 10:24 AM Go to last post
  35. Question finding UMVUE

    let X_1,X_2,.....X_n be a random sample from f(x;\theta)=\frac{e^{-|x|/\theta}}{2\theta}, -\infty<x<\infty Find UMVUE of \theta^r help needed...

    Started by Sambit‎, 11-13-2010 07:45 AM
    • Replies: 3
    • Views: 6,943
    11-13-2010, 01:44 PM Go to last post
  36. Question MLE of bivariate normal

    how to calculate the MLEs of the 5 parameters of a bivariate normal population, the parameters being \mu_x,\mu_y,\sigma_x,\sigma_y,\rho? while...

    Started by Sambit‎, 11-26-2010 02:06 AM
    • Replies: 3
    • Views: 9,743
    11-30-2010, 02:23 AM Go to last post
  37. Repeated measures anova or t test

    Hi, The question I have is about which test I could use for the following case: - two groups (an experimental and a control group) - two measures...

    Started by pcastro‎, 12-17-2010 01:25 PM
    • Replies: 3
    • Views: 6,706
    01-08-2011, 12:43 PM Go to last post
  38. an event study? I can't stand. which way should I choose?

    Please a little help. There is an event. You can think a government interference . So, price of firms is decreased and therefore quantity of...

    Started by tiago2‎, 01-01-2011 07:12 AM
    • Replies: 3
    • Views: 6,358
    01-02-2011, 06:15 PM Go to last post
  39. 2 Dice Rolls vs. 1 Target Number

    Hi guys, I hope you don't mind my posting this here. I'm a game designer who needs some help working out probabilities for a dice roll mechanic, and...

    Started by Mechalus‎, 01-05-2011 05:42 PM
    • Replies: 3
    • Views: 4,100
    01-06-2011, 11:09 AM Go to last post
  40. Preference - which statistical method?

    I'm conducting an experiment on female preference with respect to male colouration (black vs. white male mice). The results of the experiment...

    Started by scully101‎, 01-15-2011 02:19 PM
    • Replies: 3
    • Views: 7,598
    01-15-2011, 03:38 PM Go to last post
  41. Can relationship be both moderated and mediated?

    Hello....using SPSS I've found that the relationship between my IV and DV is fully mediated (Baron and Kenny) by Med1. I've also found using the...

    Started by eva2‎, 01-17-2011 01:59 PM
    • Replies: 3
    • Views: 3,688
    01-17-2011, 07:35 PM Go to last post
  42. How to analyze different, complex data sets?

    I'm looking for a good way to compare data sets. For 20 months, we collected larval fish using standard sampling gear (produces larval fish/cubic...

    Started by The_Hand_Hunter‎, 01-20-2011 01:23 PM
    ecological statistics, study design
    • Replies: 3
    • Views: 9,143
    01-25-2011, 04:13 AM Go to last post
  43. Question testing problem

    Let X_1 and X_2 be random sample from a distribution having the probability distribution function f(x). Consider the testing of H_0:f(x)=f_0(x)...

    Started by Sambit‎, 01-21-2011 10:23 AM
    • Replies: 3
    • Views: 1,873
    01-22-2011, 10:06 AM Go to last post
  44. Sunfish NMDS/PERMANOVA in reverse

    I have extensive habitat data for four sunfish species, and I would like to determine if (statistically) they partition habitats to reduce...

    Started by sms16‎, 02-07-2011 02:02 PM
    permanova nmds sunfish
    • Replies: 3
    • Views: 4,500
    02-08-2011, 12:41 AM Go to last post
  45. t-tests after three-way ANOVA?

    Hi all, I've just run a three-way ANOVA on my data (3 IVs, 1 DV). I've got some main effects, as well as a three-way interaction effect. Am I...

    Started by psychi‎, 03-01-2011 05:29 AM
    anova, t-test, three-way anova
    • Replies: 3
    • Views: 5,850
    03-04-2011, 05:20 PM Go to last post
  46. Help with t-test data analysis

    Hi everyone, I am a bit lost when it comes to stats, having only had a tiny amount of it so far. In my biology class we are writing a paper on if...

    Started by dbaker‎, 03-23-2011 07:31 PM
    • Replies: 3
    • Views: 3,221
    04-05-2011, 05:19 AM Go to last post
  47. nonparametric estimate the distribution with a histogram only

    Suppose X1,.., Xn ~iid F with mean mu_F The data is summarized in a histogram and that is all I have. I don't have the individual Xi (i = 1,...,n)....

    Started by zzzc‎, 03-23-2011 11:32 PM
    • Replies: 3
    • Views: 3,070
    03-24-2011, 11:47 PM Go to last post
  48. Excess Return - Benchmark Returns

    Well, I am new in the field of business research with very little stastics knowledge. Problem is that I have to calculate <excess return> which...

    Started by SFranck‎, 04-06-2011 07:15 PM
    • Replies: 3
    • Views: 5,547
    04-06-2011, 08:11 PM Go to last post
  49. Correction for multiple testing when tests are dependent

    Dear all, I have a following problem: given N variables, I calculate N(N-1)/2 correlation coefficients, each against each (this is commonly used...

    Started by jw3‎, 04-08-2011 04:24 AM
    • Replies: 3
    • Views: 7,711
    04-08-2011, 02:24 PM Go to last post
  50. Mann-Whitney or independant T-test?

    Hey all, I'm in the middle of a study comparing a group of CONTROL MICE vs EXPERIMENTAL MICE before and after a stroke. I'm looking at comparing:...

    Started by dkhamoo‎, 04-15-2011 10:56 AM
    • Replies: 3
    • Views: 4,302
    06-13-2011, 05:01 PM Go to last post
  51. PCA latent variables

    For exploratory purposes, should PCA (Principal Component Analysis) be done for one latent variable at a time or should it done for all the latent...

    Started by rajarshic‎, 04-25-2011 10:59 AM
    latent construct, latent variable, pca
    • Replies: 3
    • Views: 4,786
    04-25-2011, 09:33 PM Go to last post
  52. T-test appropriate?

    Hello all, I have a big dataset which I divided into different periods (years) and focused on one group. I calculated the means for the different...

    Started by zerostin‎, 04-26-2011 11:35 AM
    • Replies: 3
    • Views: 2,424
    04-28-2011, 06:33 AM Go to last post
  53. Can anyone help please?

    Hi there, for my dissertation I wanted to know the important factors that managers consider in selecting a supplier. I used a likert scale 1-5 from...

    Started by gizmo00‎, 05-08-2011 02:45 PM
    • Replies: 3
    • Views: 1,712
    05-12-2011, 10:59 AM Go to last post
  54. Need help in finding historic data on real interest rate and CPI

    Hi everyone, In my research I use several financial instruments including real interest rate and real CPI. So far, I have been unable to find any...

    Started by E574‎, 05-18-2011 11:28 AM
    • Replies: 3
    • Views: 4,208
    05-21-2011, 10:01 AM Go to last post
  55. Calculating proability

    If the probability of a resulting number being 10 is %80 chance, 5 %50 and -2 %40 what is the most probable outcome(it could be between values) based...

    Started by Noobie‎, 05-26-2011 05:48 AM
    • Replies: 3
    • Views: 2,046
    06-13-2011, 02:37 PM Go to last post
  56. Forest Plots - Please Help!!!!!

    How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

    Started by Astero‎, 06-22-2011 12:44 PM
    forest plots, statistics, statistics help
    • Replies: 3
    • Views: 8,779
    06-22-2011, 05:55 PM Go to last post
  57. paired t test and simple linear regression

    Two repeatedly measured samples: 15 subjects were measured by two different machines (old and new) for their weight subject machine 1 machine...

    Started by manoa‎, 07-06-2011 04:48 PM
    • Replies: 3
    • Views: 11,360
    07-06-2011, 05:48 PM Go to last post
  58. matching

    How close in age must subjects be for them to be considered matched for age in an experiment? For example, if I am conducting an experiment on...

    Started by rebecca‎, 07-07-2011 01:20 PM
    • Replies: 3
    • Views: 2,064
    07-07-2011, 02:31 PM Go to last post
  59. which test I should use?

    hello, i am conducting research on retail atmosphere in which i have collected data on three different retailing sectors i.e furniture retailers,...

    Started by Anoushey Ali‎, 07-13-2011 12:21 PM
    • Replies: 3
    • Views: 2,133
    07-13-2011, 04:09 PM Go to last post
  60. statistical significance and number of experiments required

    Hi all I have a n*3 matrix. I add guassian noise with mean 0 and SD 1 to this matrix ... My hypothesis is that this noise does not change a...

    Started by azar373‎, 07-14-2011 11:43 AM
    • Replies: 3
    • Views: 2,304
    07-14-2011, 01:04 PM Go to last post

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