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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: 18,669
    10-11-2014, 12:02 PM Go to last post
  1. 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: 4,436
    09-09-2010, 05:56 AM Go to last post
  2. Question Regarding Results from Matched Pair T-Test versus Tamhane's Test

    I have a group of data from a survey regarding attitudes. The data was collected pre and post intervention on a group of students. The data n is...

    Started by vbode‎, 09-06-2010 07:08 AM
    • Replies: 1
    • Views: 4,475
    09-07-2010, 10:44 AM Go to last post
  3. non-parametric 1-way anova, but samples not independent

    Hi, I'm in a quandary. Samples that I wish to analyse are ordinal and should be treated as a matched (dependent) since they were drawn from a...

    Started by DrCJones‎, 09-07-2010 01:51 AM
    • Replies: 1
    • Views: 4,239
    09-07-2010, 07:27 AM Go to last post
  4. Does anybody have a calculus example for Bartlett and Levene tests?

    Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

    Started by quantster‎, 09-01-2010 02:54 PM
    • Replies: 14
    • Views: 6,404
    09-07-2010, 05:59 AM Go to last post
  5. Combining outcome scores: standardising case and control data

    Hi tehre, I have 2 separate tasks that I ask a group of individuals to complete, half the group are given a drug after the baseline measure is...

    Started by JG28‎, 09-05-2010 08:02 PM
    • Replies: 0
    • Views: 3,833
    09-05-2010, 08:02 PM Go to last post
  6. Comparing means from SAME sample

    I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

    Started by HumanParticipantResearch‎, 09-01-2010 01:35 PM
    • Replies: 0
    • Views: 3,612
    09-01-2010, 01:35 PM Go to last post
  7. repeated measures MANOVA on mixed design

    Hi folks, I have data from a drug study that I am trying to perform statistical analysis on, and am not sure if my approach is correct. I was...

    Started by simhan4‎, 08-30-2010 03:24 PM
    • Replies: 0
    • Views: 7,025
    08-30-2010, 03:24 PM Go to last post
  8. Negative binomial regression / poisson regression

    Does anyone have experience with STATA? and more specifically how to conduct a negative binomial regression in stata? My problem is that i dont...

    Started by paul de boer‎, 08-27-2010 09:56 AM
    • Replies: 2
    • Views: 8,789
    08-28-2010, 04:24 AM Go to last post
  9. Interpret statistical data - Relative risk, power, and significance?

    "We estimated that a sample size of 1240 patients followed up for an average of 3 years would lead to detection of a 33% difference in the relative...

    Started by nana0709‎, 08-27-2010 08:14 AM
    • Replies: 4
    • Views: 6,246
    08-28-2010, 03:53 AM Go to last post
  10. paired T-test or anova

    Dear all just a quick simple one this time. if i had two sets of runners (in a race) for example and these two groups were linked only by the fact...

    Started by yoma819‎, 08-22-2010 05:51 PM
    • Replies: 7
    • Views: 5,567
    08-23-2010, 10:53 PM Go to last post
  11. Question Sample size calculation formulae

    Sample size calculation formulae Can someone please let me know where I can find a suitable 'Sample Size calculation Formula'? A standard...

    Started by sachitha‎, 08-21-2010 11:07 AM
    • Replies: 2
    • Views: 3,683
    08-21-2010, 11:38 AM Go to last post
  12. 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: 91,367
    08-19-2010, 03:49 AM Go to last post
  13. 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: 5,115
    08-19-2010, 12:28 AM Go to last post
  14. minimum data points for the K-s test for normality

    Dear all I have 6 points of data that i need to test for normality. is this enough to use the K-s test? what is the advised minimum for this test?...

    Started by yoma819‎, 08-18-2010 04:45 PM
    • Replies: 0
    • Views: 4,538
    08-18-2010, 04:45 PM Go to last post
  15. data transformation software

    Does anyone know of any software that will transform data to normality for me? specifically first one: lognormal second one:burr(4p) third one:...

    Started by yoma819‎, 08-17-2010 11:49 AM
    • Replies: 2
    • Views: 3,053
    08-17-2010, 01:08 PM Go to last post
  16. error on percentile estimation

    Hi all, I have a problem that I need help on please. I have some 1000 samples from an unknown distribution, from which I wish to derive various...

    Started by Jack Carter‎, 08-17-2010 03:54 AM
    • Replies: 2
    • Views: 6,515
    08-17-2010, 06:01 AM Go to last post
  17. data transformation links please

    Can anyone suggest a guide or link for more information on the transformation or non normally dirtibuted data? many thanks yoma

    Started by yoma819‎, 08-15-2010 04:25 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,566
    08-16-2010, 11:59 AM Go to last post
  18. muscle strength gain vs. time vs. age

    Anyone have data from longitudinal studies on this? 1% per week seems like a reasonable initial value. Thanks.

    Started by Outlier‎, 08-15-2010 04:24 PM
    • Replies: 0
    • Views: 3,387
    08-15-2010, 04:24 PM Go to last post
  19. A Non parametric equivelent to mixed anova?

    Hello, I am trying to find a non-parametric equivalent to a mixed Anova? My data is horrible. Three small unequal groups (8, 8, 4) and data...

    Started by Elaine98‎, 08-14-2010 07:33 AM
    • Replies: 1
    • Views: 5,064
    08-14-2010, 09:36 AM Go to last post
  20. paired anova for lack of a better word advice please

    Dear All i am stuck at the moment between a rock and a hard place. the short of the story is this. I have 84 petri dishes each containing 4 lines...

    Started by yoma819‎, 08-08-2010 05:58 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,111
    08-14-2010, 08:41 AM Go to last post
  21. post-hocs for repeated measures ancova

    hi there, i am running a 2x2x3 repeated measures anova with a covariate i have an interaction between two within-subjects variables, and...

    Started by purplestar‎, 08-10-2010 07:59 AM
    • Replies: 0
    • Views: 4,143
    08-10-2010, 07:59 AM Go to last post
  22. Does anyone know what associated means??

    I have a stochastic process. Think of it as an assembly line. For the ith item that enters the process it produces a total work time of Y(ti). A...

    Started by wwreith‎, 08-06-2010 09:14 AM
    • Replies: 1
    • Views: 2,993
    08-06-2010, 10:55 AM Go to last post
  23. difference between mean ranks

    Hello! I asked respondents to rank 13 motivation factors in order of importance (from the most important to the least important). Now, I would...

    Started by m777k‎, 08-06-2010 07:34 AM
    • Replies: 1
    • Views: 5,583
    08-06-2010, 08:25 AM Go to last post
  24. How to describe data that trends to a horizontal aymptote?

    Hi all, I'm designing a within-subject experiment with one independent variable X, where we are expecting the dependent variable to increase...

    Started by metric‎, 08-05-2010 01:13 PM
    • Replies: 0
    • Views: 2,967
    08-05-2010, 01:13 PM Go to last post
  25. Sampling question

    I have to estimate 2 parameters from a health claims database: the total dollars paid correctly and the proportion of claims adjudicated correctly. ...

    Started by mrc112‎, 08-05-2010 10:55 AM
    • Replies: 0
    • Views: 2,006
    08-05-2010, 10:55 AM Go to last post
  26. Strange likelihood function

    I have seen multiple instances where a strange negative log-likelihood function is used either to describe the posterior distribution of a model fit...

    Started by ErinFish‎, 07-28-2010 01:03 PM
    • Replies: 2
    • Views: 3,463
    08-04-2010, 01:34 PM Go to last post
  27. Problems with ANOVA Assumptions and I don't think Kruska Wallis will help

    I am conducting an experiment with four independent variables each of which has three or more factor levels. The sample size is quite large i.e....

    Started by wwreith‎, 08-02-2010 08:54 AM
    • Replies: 1
    • Views: 5,448
    08-03-2010, 01:01 PM Go to last post
  28. "significance metrics" for hypothesis testing

    ------------

    Started by p05‎, 08-02-2010 04:58 PM
    • Replies: 0
    • Views: 2,585
    08-02-2010, 04:58 PM Go to last post
  29. levy process, subordinator

    Hi, I start to come across papers talking about levy process and subordinator. Any suggestion for textbook about this topic? Thank you

    Started by pipehappy‎, 08-02-2010 12:53 PM
    • Replies: 0
    • Views: 3,998
    08-02-2010, 12:53 PM Go to last post
  30. Question What is the accepted Confidence Interval for a Business research..

    Hi all, I need to know the accepted Confidence Level (e.g. whether it is 95% or 99%) and the accepted "Confidence Interval" (e.g. if it is 10 or...

    Started by sachitha‎, 07-24-2010 11:33 PM
    • Replies: 4
    • Views: 8,887
    07-31-2010, 11:15 AM Go to last post
  31. Nonparametric assumptions

    Hi, I've come across a paper in the environmental science literature that suggests that the assumption of independence (and additivity) needed in...

    Started by suobs‎, 07-24-2010 11:25 AM
    • Replies: 9
    • Views: 6,717
    07-29-2010, 11:17 AM Go to last post
  32. Question about Stationary R^2 and Ljung-Box Statistics in ARIMA Models...

    On the results of my ARIMA models in SPSS, I am getting Ljung-Box statistics that are statistically significant (P < 0.05) but also horrible R^2...

    Started by stormmedic85‎, 07-25-2010 07:44 PM
    • Replies: 0
    • Views: 4,253
    07-25-2010, 07:44 PM Go to last post
  33. t test using diversity index

    So, I am trying to perform a t-test using diversity indexes, but the biostat book I am using is a little bit confusing. the calculated t value =...

    Started by agarcin‎, 07-23-2010 08:49 PM
    • Replies: 0
    • Views: 3,382
    07-23-2010, 08:49 PM Go to last post
  34. How to correct negative skew

    My dependent variable is negatively skewed with 5 outliers. How do you correct a negative skew? Thanx.

    Started by elf212‎, 07-21-2010 08:20 PM
    • Replies: 2
    • Views: 8,113
    07-23-2010, 05:03 PM Go to last post
  35. Multicointegration - alternative variable?

    Time series: For example, if a dependent variable only have 17 observations could I replace it with something with more data if I want a rough...

    Started by tomandjerry714‎, 07-19-2010 07:31 PM
    • Replies: 0
    • Views: 6,841
    07-19-2010, 07:31 PM Go to last post
  36. variables that are not independent of each other

    What are some ways this dependency is modeled with statistical methods?

    Started by Outlier‎, 07-16-2010 03:12 PM
    • Replies: 5
    • Views: 3,847
    07-16-2010, 05:03 PM Go to last post
  37. multiple groups & dichotomous responses

    I have a set of data from a number of countries where interviewees have answered simple yes/no questions. The "DV" is, in other words, 1 or 0, and...

    Started by pjotr66‎, 07-09-2010 04:02 AM
    • Replies: 8
    • Views: 5,297
    07-16-2010, 10:29 AM Go to last post
  38. Extreme events...

    Hi. Is {w:P(w) is very small} acceptable to translate the meaning of extreme events given in the following sentence: An extreme event is defined as...

    Started by tsukiko‎, 07-14-2010 07:41 AM
    • Replies: 6
    • Views: 4,595
    07-14-2010, 07:47 PM Go to last post
  39. Intraclass correlation coefficients for linear mixed models

    I've been looking around for a while and have yet to find and answer to satisfy my appetite. Hopefully, one of the members here will be able to help....

    Started by Link‎, 07-13-2010 02:51 PM
    • Replies: 0
    • Views: 3,929
    07-13-2010, 02:51 PM Go to last post
  40. 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: 2,877
    07-13-2010, 02:23 PM Go to last post
  41. Log likelihood function for P-EGARCH(1,1)-t needed

    Hi guys, I am currently writing my MSc. Finance thesis on calendar effects, using a Periodic Exponential GARCH(1,1) model with student-t error...

    Started by ROSSINL‎, 07-11-2010 11:30 PM
    • Replies: 0
    • Views: 4,107
    07-11-2010, 11:30 PM Go to last post
  42. Latin Hypercube sampling with correlations

    Hello! I am trying to generate a 9-dimensional Latin Hypercube sample (1000 draws or so) where each dimension variable is normally distributed...

    Started by Vlob‎, 07-07-2010 02:57 AM
    • Replies: 0
    • Views: 3,228
    07-07-2010, 02:57 AM Go to last post
  43. How to predict prevalence rate based on demographic factors?

    Some background: I've been teaching myself some math and statistics - started developing software as a kid and went right into the field after...

    Started by kgmiller‎, 07-06-2010 01:14 AM
    • Replies: 4
    • Views: 4,169
    07-06-2010, 09:40 PM Go to last post
  44. Need Help in identifying problem

    Hello all, Imagine you have two time series X1,X2,...Xt - represents incoming volume to the yard, and Y1,Y2,...,Yt - outgoing volume from the...

    Started by Tart‎, 07-06-2010 01:51 PM
    • Replies: 2
    • Views: 2,958
    07-06-2010, 08:36 PM Go to last post
  45. compute true values monte carlo simulation

    Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

    Started by alex76‎, 06-10-2010 03:34 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,678
    07-04-2010, 05:19 AM Go to last post
  46. statistics calculator to adjust for design effect

    Hi there, I'd like to know if anyone could tell me of a stats calculator that can adjust means and confidence intervals of analyses (paired-t and...

    Started by psychomania85‎, 06-29-2010 03:48 AM
    • Replies: 1
    • Views: 4,968
    07-01-2010, 02:41 PM Go to last post
  47. Question NLP Algorithm Evaluation: Help?

    Hello guys, We're beginners here and please excuse us if our questions are inappropriate in any way. We have a statistics-related problem, and...

    Started by gvadalkivir‎, 06-28-2010 03:01 PM
    • Replies: 0
    • Views: 2,894
    06-28-2010, 03:01 PM Go to last post
  48. rxc contingency table: comparison between cells?

    Hello.I'm a dental student. I'm studying about how restorative methods are going to affect fracture pattern(fra.(fp)) of teeth. As a result I have a...

    Started by batosan‎, 06-24-2010 06:58 AM
    • Replies: 7
    • Views: 5,702
    06-26-2010, 04:52 AM Go to last post
  49. Significant Difference with 2 vars

    Hi everyone, Is it at all possible to determine if a group of points on a scatterplot are significantly different from another group of points? ...

    Started by harryema‎, 06-24-2010 07:04 PM
    • Replies: 7
    • Views: 3,765
    06-25-2010, 11:03 AM Go to last post
  50. Youden Index

    Hello, I am doing some ROC analysis comparing grading scales for intracerebral hemorrhage. My question is - can the Youden Index be considered a...

    Started by sbruce44‎, 06-23-2010 02:51 PM
    • Replies: 0
    • Views: 6,136
    06-23-2010, 02:51 PM Go to last post
  51. How have you dealt with missing values?

    I'm currently conducting a large content analysis on company disclosures and have a lot of missing values. I've been looking at different ways to try...

    Started by Freaked_out‎, 06-21-2010 11:54 PM
    • Replies: 0
    • Views: 2,953
    06-21-2010, 11:54 PM Go to last post
  52. P-value Formula for Z-test Statistic

    Hello All, I am trying to find the formula for p-value for a z-test. Ultimately, I would like to code this in PHP, but first need to start by...

    Started by rwd5013‎, 06-17-2010 01:50 PM
    • Replies: 2
    • Views: 14,929
    06-17-2010, 05:13 PM Go to last post
  53. Introduction for Observational Study on Red Cars

    This is the Introduction for my stats project on red cars vs. speeding tickets received. Let me know what changes to make, and how the intro is....

    Started by Thanasi‎, 06-13-2010 09:01 AM
    • Replies: 0
    • Views: 3,499
    06-13-2010, 09:01 AM Go to last post
  54. try this for kicks...

    Hi everyone! First post for me. I think this might be a bit tricky, but i would really appreciate some help (go figure..). I recently got...

    Started by deadrabbit‎, 06-11-2010 07:16 AM
    • Replies: 2
    • Views: 1,990
    06-12-2010, 03:04 AM Go to last post
  55. Mle

    Hi guys, I need advice regarding this question: The height of students at university is a random variable from the N(\mu,25) distribution. A...

    Started by WeeG‎, 06-08-2010 06:21 AM
    • Replies: 11
    • Views: 3,280
    06-10-2010, 01:17 PM Go to last post
  56. Repeated measures ancova

    Hi I am very stuck does anyone know how to run a repeated measures ancova in spss please!!!!

    Started by Rich D‎, 06-09-2010 02:45 PM
    • Replies: 1
    • Views: 4,656
    06-09-2010, 05:19 PM Go to last post
  57. another MLE please

    f(x)=e^-(x-\theta) -(x-\theta) is the exponent x>\theta I need to find MLE for \theta I tried doing it with a graph, but I got strange...

    Started by WeeG‎, 06-09-2010 09:33 AM
    • Replies: 4
    • Views: 5,318
    06-09-2010, 02:09 PM Go to last post
  58. dependent cases in logsitic regression, any recourse?

    I'm hoping to use logistic regression to analyze a 2x3 repeated-measures factorial design. The IVs are both categorical. The DV is dichotomous...

    Started by reductico‎, 06-08-2010 01:52 PM
    • Replies: 0
    • Views: 2,177
    06-08-2010, 01:52 PM Go to last post
  59. best way to use Cronbach's alpha?

    I am making my first foray into survey based research. A quick question or two about Cronbach's alpha: My survey included questions about...

    Started by student's t top‎, 06-07-2010 02:22 PM
    • Replies: 1
    • Views: 6,688
    06-07-2010, 03:55 PM Go to last post
  60. Regression Model

    wefwefwfweff

    Started by fhaquassho‎, 06-03-2010 06:07 PM
    • Replies: 3
    • Views: 3,879
    06-04-2010, 09:04 AM Go to last post

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