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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: 18,758
    10-11-2014, 12:02 PM Go to last post
  1. Difficulty with Rank-biserial correlation coefficient, N = 5

    Hi there, I am calculating Difficulty with Rank-biserial correlation coefficients in a spreadsheet using the following formula: rb = (2/n)*(Y1...

    Started by BOAZ‎, 01-22-2012 05:59 PM
    rank-biserial correlation
    • Replies: 6
    • Views: 7,852
    01-22-2012, 08:49 PM Go to last post
  2. Help with data!!!

    Hi, I am new to the forum and would massively appreciate some help with some research I am doing. I am looking at a series of students marks over...

    Started by Milly‎, 01-21-2012 02:49 PM
    • Replies: 2
    • Views: 1,414
    01-21-2012, 06:52 PM Go to last post
  3. Hypothesis about bus arrivals distribution

    Hi I have collected data in the bus stop registering bus arrival times. Now I want to find the distribution that fits to this data. Trying in...

    Started by endri81‎, 01-20-2012 02:35 PM
    • Replies: 1
    • Views: 2,197
    01-20-2012, 03:52 PM Go to last post
  4. queuing theory

    I have to solve this exercise and i stuck any help??? we have 20 scietists arrive per hour and the x-ray station can proccess 45 employees per hour....

    Started by nikosnikos‎, 01-19-2012 03:21 PM
    • Replies: 0
    • Views: 1,337
    01-19-2012, 03:21 PM Go to last post
  5. Question Scientific Theories

    When evaluating a theory, which of these criteria do you think is the most important, the least important, and why? Do all of these criteria need to...

    Started by misty‎, 01-17-2012 07:42 PM
    • Replies: 9
    • Views: 3,588
    01-19-2012, 02:40 PM Go to last post
  6. Two-dimensional outlier detection

    Hi all, I was wondering if you could give me some suggestions to detect two-dimensional outliers, i.e. for values depending on the variables. A...

    Started by bontus‎, 01-19-2012 10:39 AM
    outlier detection, two-dimensional
    • Replies: 1
    • Views: 3,424
    01-19-2012, 01:06 PM Go to last post
  7. parceling

    Hi, I've already posted this in the Psychology Statistics, but I am not sure if this was the right forum. Here are my questions again: I am...

    Started by Julia13‎, 01-19-2012 10:34 AM
    • Replies: 0
    • Views: 1,414
    01-19-2012, 10:34 AM Go to last post
  8. likelihood in two parameters

    Hi guys, i'm new here! I'm an italian student. i would like to begin with a very stupid question :) i'm reading a paper on the likelihood ratio...

    Started by gravity_rainbow‎, 01-18-2012 05:27 PM
    • Replies: 3
    • Views: 1,829
    01-18-2012, 05:44 PM Go to last post
  9. Bradley-Terry model and the difference between football goals?

    Hi everyone ! I'm actually working on the Bradley-Terry model, and I cannot find any answer for my problem... Perhaps you can help me ?! The...

    Started by malymalone‎, 01-18-2012 01:08 PM
    • Replies: 0
    • Views: 1,536
    01-18-2012, 01:08 PM Go to last post
  10. Non-normality revisited

    We had a debate on whether normality is required for OLS regression a while back. I ran across this in a book on regression. One of the authors (Ali...

    Started by noetsi‎, 01-11-2012 12:01 PM
    • Replies: 3
    • Views: 1,875
    01-17-2012, 08:46 AM Go to last post
  11. method comparison/agreement

    I have two methods I want to compare, normally I would use the Blamd and Altman approach to agreement, however in this case the two methods that I...

    Started by nicklt‎, 01-16-2012 11:09 AM
    • Replies: 1
    • Views: 2,033
    01-16-2012, 05:18 PM Go to last post
  12. Factor scores to classify groups?

    Hi there, I have carried out a principal component analysis and I would like to use the factor scores to classify 5 groups of respondents. What...

    Started by gav‎, 01-16-2012 10:03 AM
    classification, factor scores, groups, pcp
    • Replies: 0
    • Views: 2,104
    01-16-2012, 10:03 AM Go to last post
  13. Can I ignore the third independent variable?

    Hi all! Here's some background: I have measured 103 patients' postural steadiness. The independent variables (or within-subject factors) in my...

    Started by Tikkuhirvio‎, 01-16-2012 09:01 AM
    • Replies: 0
    • Views: 2,309
    01-16-2012, 09:01 AM Go to last post
  14. linear relation / stationarity

    i need a clarification: if we have a linear relation between data, we can say that the processus is stationary ?? :wave:

    Started by sihem‎, 01-15-2012 11:58 AM
    • Replies: 0
    • Views: 1,359
    01-15-2012, 11:58 AM Go to last post
  15. t-test confusion

    I need help with something and i am a bit confused. I do a comparative content analysis measuring arguments between two websites about various...

    Started by micdhack‎, 01-11-2012 04:06 PM
    • Replies: 0
    • Views: 1,459
    01-11-2012, 04:06 PM Go to last post
  16. Imputed data sets

    I am doing a project where there are two different primary outcome variables (one smoking related and one alcohol related) that are being analysed...

    Started by nicklt‎, 01-11-2012 09:11 AM
    • Replies: 1
    • Views: 1,276
    01-11-2012, 09:20 AM Go to last post
  17. Holt's Exponential Smoothing Vs Brown Double Exponential Smoothing

    Hello, According to books Brown Double Exponential Smoothing (one parameter=alpha) is a special case of Holt's Linear Exponential Smoothing (two...

    Started by zarasandreas‎, 01-10-2012 05:51 AM
    • Replies: 0
    • Views: 3,280
    01-10-2012, 05:51 AM Go to last post
  18. Data Set of Pattern Recognition

    I need help in looking for a data set for classification. The kind of data I am looking for are where measurements are available from experimental...

    Started by teotjunk‎, 01-09-2012 02:24 AM
    • Replies: 1
    • Views: 2,178
    01-09-2012, 03:15 AM Go to last post
  19. Approximate Bayesian Computation and joint posteriors

    Hi! I am performing Approximate Bayesian Computation (ABC) in phylogenetic research. I have a few questions for which I am looking for a useful...

    Started by Stingery‎, 01-08-2012 10:30 PM
    abc, bayes, joint distribution, posterior
    • Replies: 0
    • Views: 1,244
    01-08-2012, 10:30 PM Go to last post
  20. Wink One Sample T-Test

    For an exercise is received speed measurements on two road points. The cars drove along an urban road (30mph) that opened into a rural road (60mph)....

    Started by Downburstx‎, 01-04-2012 05:41 AM
    normal distributed, one sample, t-test
    • Replies: 9
    • Views: 2,391
    01-08-2012, 02:06 PM Go to last post
  21. Help with multivariate (MCA) analysis graph interpretation

    Hi All, Thanks in advance for any insight you can offer!! Ive been tasked with analyzing possible correlation between various quantitative...

    Started by Gags‎, 01-04-2012 07:18 PM
    • Replies: 1
    • Views: 4,002
    01-06-2012, 07:44 PM Go to last post
  22. Post ICC and Factor scores

    Dear All, I am computing Inter-class correlations (ICC) for a multilevel comparison of geographical areas. I have a long list of indicators and for...

    Started by gav‎, 01-06-2012 08:17 AM
    factor scores, icc, multilevel analysis
    • Replies: 0
    • Views: 2,032
    01-06-2012, 08:17 AM Go to last post
  23. Pre/Post-Survey Methodology Question

    I'm working on a project where we did a pre-survey to get a baseline assessment on health knowledge and attitudes in several states, conducted a...

    Started by DLU‎, 01-04-2012 12:34 PM
    • Replies: 5
    • Views: 13,252
    01-06-2012, 06:35 AM Go to last post
  24. Modeling residual variance in regression

    Hi all Consider an ordinary linear regression model. The residuals are assumed to be normally distributed on N(0,sigma). I believe it is possible...

    Started by longrob‎, 12-26-2011 08:33 AM
    • Replies: 2
    • Views: 3,100
    01-05-2012, 10:07 AM Go to last post
  25. Writing my own package for classes

    Hi, I'm looking for idea for package(about 5 functions and one base data) in R. Everything what come to my mind is closed to what I do on classes,...

    Started by ldurniat‎, 01-04-2012 07:29 AM
    • Replies: 6
    • Views: 1,707
    01-04-2012, 07:24 PM Go to last post
  26. Statistical projects

    pls I'm looking for possible projects in statistics... hopefully on TIME SERIES or FORECASTING.... please could anyone kindly help me out. Thanks

    Started by peterkorlems‎, 01-04-2012 02:20 AM
    • Replies: 0
    • Views: 1,446
    01-04-2012, 02:20 AM Go to last post
  27. Kernel Density Estimation (KDE)

    I feel unsure as to what is the minimum number of genuine (real life) data points needed to applied the procedure and estimate the curve. Any...

    Started by dzericak‎, 01-03-2012 09:42 AM
    • Replies: 3
    • Views: 2,665
    01-03-2012, 07:08 PM Go to last post
  28. Sensitivity Analysis for Multivariable Problem

    Hello all, first off I hope this is in the right forum and thanks for reading. I am a practicing engineer and have run into a problem where I have...

    Started by Acorogia‎, 12-23-2011 06:39 PM
    • Replies: 2
    • Views: 1,802
    01-03-2012, 02:47 PM Go to last post
  29. Trebling the distance between 2 points in a continuous parameter space ?

    I have say a sample of n p dimensional points and I want to treble the distance between each point and the mean of all the points in continuous...

    Started by teotjunk‎, 01-02-2012 07:59 PM
    • Replies: 0
    • Views: 1,272
    01-02-2012, 07:59 PM Go to last post
  30. Survey Analysis

    I have survey results that needs to be analyzed . Basically, survey contains 5 categories and each categorie has some questions. The subjects rated...

    Started by masarimk‎, 12-28-2011 11:28 AM
    • Replies: 2
    • Views: 1,562
    01-02-2012, 12:16 PM Go to last post
  31. Paired or unpaired data: please help

    Hi all, I have this question and have been toiling on it for days. Am not sure if I'm tackling it correctly. A group of patients attending a...

    Started by cliff75‎, 01-02-2012 06:23 AM
    paired, stata, unpaired data
    • Replies: 5
    • Views: 4,215
    01-02-2012, 11:23 AM Go to last post
  32. Which test to use for this?

    Hi folks, I'm conducting a little test with a friend who plays roulette online. He maintains that the 'spins' generated by online casinos are...

    Started by Jacobite‎, 12-30-2011 04:28 AM
    • Replies: 4
    • Views: 2,090
    12-31-2011, 02:47 PM Go to last post
  33. Minimum sample for a t-test independent samples

    I have a sample which consists of 2 treatments and 15 unique samples. Data are interval. It was obtained by measuring arguments in similar pages from...

    Started by micdhack‎, 12-30-2011 06:24 AM
    • Replies: 5
    • Views: 3,891
    12-30-2011, 11:59 AM Go to last post
  34. Hartigan's Dip Test for Bi-Modality: Rejecting surprising distributions

    Hi, I'm new here. Thanks for providing this forum! I'm checking some separate sample distributions for bi-modality since most but not all of them...

    Started by kerrio‎, 12-22-2011 12:31 AM
    • Replies: 1
    • Views: 7,023
    12-29-2011, 08:05 PM Go to last post
  35. Smile Correlational stusy, Conformity and Intelligence

    Im doing a research correlation between Confirmity and Intelligence. Got 60 sample size. All participants where given 2 tests to fill up, Approval...

    Started by Psychonaut‎, 12-26-2011 02:36 AM
    correlational study help
    • Replies: 5
    • Views: 3,605
    12-29-2011, 07:51 PM Go to last post
  36. longitudinal analysis help

    Hi there Im struggling to figure out which statistical test i need to use on my data and then also how to carry this out in R or SPSS.... I have...

    Started by andyspeak‎, 12-15-2011 10:25 AM
    longitudinal study, time-series
    • Replies: 6
    • Views: 2,581
    12-29-2011, 01:09 PM Go to last post
  37. Interpreting independent t-test result!

    Alright , i had posted a t-test with nonsensical results earlier. There was some installation problem with SPSS and i computed again after installing...

    Started by kathmustdie‎, 12-28-2011 10:27 PM
    • Replies: 3
    • Views: 4,043
    12-29-2011, 11:10 AM Go to last post
  38. Independent t test - small sample size - use all data points?

    Hi there, I am running a small study in which both treatment (n = 7) and control groups (n= 6) have undertaken the same 48 item rating scale task...

    Started by BOAZ‎, 12-28-2011 08:34 PM
    data points, independent t test, small sample size
    • Replies: 1
    • Views: 3,088
    12-29-2011, 05:40 AM Go to last post
  39. Directional or Non-directional Hypothesis for Independant t-test?

    I am doing a comparative study on the level of depression , anxiety and stress perceived between adolescents (male and females). My sample Size is 60...

    Started by kathmustdie‎, 12-27-2011 12:36 AM
    • Replies: 8
    • Views: 12,382
    12-27-2011, 02:48 PM Go to last post
  40. Std. residuals Chi Square test

    Hi all, I am doing some research for a uni project but Im not particularly knowledgeable when it comes to statistics :). Basically, I have two...

    Started by fred_1‎, 12-23-2011 02:28 PM
    • Replies: 3
    • Views: 6,818
    12-24-2011, 03:10 AM Go to last post
  41. A method to estimate linear regression coefficients when some data is missing

    Is there a method to estimate linear regression coefficients when some data is missing, without deleting the records are missing? I know that This...

    Started by Michael123‎, 12-23-2011 10:19 AM
    • Replies: 2
    • Views: 1,758
    12-23-2011, 12:27 PM Go to last post
  42. single-case design

    hi there i am attempting to find a way to find the statistical significance of the difference between a patient's scores on a test compared with...

    Started by katiefisher35‎, 12-20-2011 03:54 PM
    • Replies: 1
    • Views: 1,494
    12-22-2011, 05:27 AM Go to last post
  43. Classification of patients based on continuous variable

    Dear TS users, I have got data on a group of patients and the amount of protein they consume. I want to classify the patients as malnourished or...

    Started by ledzep‎, 12-18-2011 05:35 PM
    • Replies: 9
    • Views: 2,150
    12-19-2011, 02:47 AM Go to last post
  44. Limiting distribution of score variable

    Prove that \frac{1}{\sqrt{n}}\left (\sum_{i=1}^{n} \frac{\partial l(X_{i};\theta )}{\partial \theta } \right...

    Started by BrownianMan‎, 12-18-2011 02:10 PM
    • Replies: 3
    • Views: 1,623
    12-18-2011, 08:00 PM Go to last post
  45. alternative to anova

    What is an alternative statistical test to anova. I have a large varience between three groups (control and two experimental). How can I determine...

    Started by deardirestraits‎, 12-15-2011 03:37 PM
    • Replies: 10
    • Views: 5,485
    12-16-2011, 09:43 PM Go to last post
  46. Research question - How relevant is standard error/confidence interval in my case??

    Hello I work for an organization that has sent online survey requests to all of our clients this year (560 only from 2011). The response rate has...

    Started by parsec2011‎, 12-16-2011 04:04 PM
    all-subject sample, confidence intervals, online surveys, relevance, research question
    • Replies: 1
    • Views: 1,726
    12-16-2011, 04:28 PM Go to last post
  47. Need help on normalizing data

    I have very limited knowledge on statistics, but I need to approach the following question, can any expert here show how to approach it? I have 2...

    Started by danyu‎, 12-15-2011 03:33 PM
    • Replies: 3
    • Views: 5,165
    12-15-2011, 04:17 PM Go to last post
  48. Confronting two tests

    Hi A group of people have taken a test with 3 possible answers. Then they underwent therapy. Finally, the took the same test again (with the 3...

    Started by roailman‎, 12-15-2011 11:50 AM
    • Replies: 2
    • Views: 1,406
    12-15-2011, 12:19 PM Go to last post
  49. What stats test to use?

    What test to use!? I have a data set in which I want to test if there is a difference between the means of a continuous variable for three...

    Started by nicklt‎, 12-15-2011 04:45 AM
    • Replies: 0
    • Views: 1,581
    12-15-2011, 04:45 AM Go to last post
  50. statistical methods for detecting the end of event

    could someone help me to propose to me different methods of detecting the end of an event example sequential test of wald have you other methods to...

    Started by sihem‎, 12-12-2011 03:22 PM
    • Replies: 3
    • Views: 1,831
    12-13-2011, 07:51 PM Go to last post
  51. Question evaluating loess fit

    Hello Everyone, I am trying to evaluate the fits of data using loess() in R. I cannot seem to find any established methods for determining the...

    Started by penn whitley‎, 12-13-2011 06:10 PM
    goodness of fit, lowess, residuals, rmse
    • Replies: 1
    • Views: 1,917
    12-13-2011, 07:13 PM Go to last post
  52. grouing variable,likertscale firm,performance,multvariate analysis

    My research is aim to investigate the mechanisms through which IT influence sustainability of competitive advantage. The data is collected through...

    Started by Anwar Shamamseldinn‎, 12-11-2011 05:45 PM
    • Replies: 0
    • Views: 1,305
    12-11-2011, 05:45 PM Go to last post
  53. Multivariate Hotelling's T or univariate test?

    Hi, I am new to the board and tried to search for Hotelling's T but could not find an answer to my problem (the appropriate test statistic). I'm...

    Started by yoosmitty‎, 12-09-2011 09:40 PM
    complex, hotelling's, index, quality, t-test
    • Replies: 0
    • Views: 1,659
    12-09-2011, 09:40 PM Go to last post
  54. Looking for One Dimensional Randomness Test ??

    Hello everyone, I hope everything is going very well with all of you. I need you help finding an answer of the following question. I do have...

    Started by Raid‎, 12-08-2011 09:36 PM
    • Replies: 6
    • Views: 2,091
    12-09-2011, 02:31 PM Go to last post
  55. Smile reliability and pilot testing...losing plot!

    Hi All I have modified an exisiting survey, added more questions. I have two separate scaleswithin this measuring different constructs, the rest...

    Started by Deborah Redmond‎, 12-06-2011 11:58 PM
    • Replies: 8
    • Views: 3,495
    12-08-2011, 03:19 PM Go to last post
  56. Stratification criteria mess up the use of a random factor?

    Hi! In my study on kelp I want to see how wave exposure and current (both continuous variables) affect kelp physical measures along the Norwegian...

    Started by Gunda‎, 12-08-2011 08:24 AM
    mixed models, nested structure, pseudoreplication, sampling design, stratified sampling
    • Replies: 0
    • Views: 1,516
    12-08-2011, 08:24 AM Go to last post
  57. Question Association of demographic variables with the questionnaire,,27questions in likert sc

    hi, I am doing a research study to see the qualtiy of life of patients,so i am having a questionnaire which uses likeret scale to collect response...

    Started by Amit Barve‎, 12-08-2011 02:37 AM
    • Replies: 0
    • Views: 1,900
    12-08-2011, 02:37 AM Go to last post
  58. Machine learning techniques for biomedical prediction

    Apologies for cross posting, I have a general question about why ML is not used more in translational research. I know that some/most...

    Started by chloropleth2‎, 12-03-2011 07:36 PM
    machine learning
    • Replies: 0
    • Views: 1,153
    12-03-2011, 07:36 PM Go to last post
  59. Practical question about Page's L test

    I have a k number of 77. Unfortunately the table I've obtained only goes to 10. :shakehead... How can I otherwise calculate the Lcrit? Thank you

    Started by Piku‎, 12-03-2011 04:05 PM
    page's l trend
    • Replies: 0
    • Views: 2,551
    12-03-2011, 04:05 PM Go to last post
  60. Non-parametric equivalent of a factorial anova (not repeated measures)?

    Hi there. Firstly apologies for the awful spelling in the main title - obviously I meant factorial Secondly hello I am new to this forum and...

    Started by chegginson‎, 12-03-2011 09:54 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 26,182
    12-03-2011, 03:52 PM Go to last post

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