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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: 18,723
    10-11-2014, 12:02 PM Go to last post
  1. Help with choosing statistics

    Hi! Stumbled over this forum recently, there's so much knowledge here I could just sit and read and read. Anyway, I'm not the strongest in stats so I...

    Started by Dave4‎, 08-29-2011 10:43 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,528
    11-22-2011, 12:09 AM Go to last post
  2. Comparing Correlation's Effect Size, Significance between Two Populations

    Hi, All! I have variables describing students (N=340), both boys (N=160) and girls (N=180). I calculated Pearson's correlation (using SPSS) for...

    Started by jonesh‎, 11-21-2011 10:45 PM
    • Replies: 2
    • Views: 2,264
    11-22-2011, 08:13 AM Go to last post
  3. Dickey Fuller Test

    I am studying the Dickey Fuller test. The book of reference is Introductory Econometrics for Finance by C. Brooks. I firstly consider the zero mean...

    Started by zarasandreas‎, 11-24-2011 12:54 PM
    dickey fuller, econometrics, stationarity
    • Replies: 1
    • Views: 3,142
    11-25-2011, 01:49 AM Go to last post
  4. Homogeneity of Variance

    Hi all, I want to test the Homogeneity of Variance (HV) before conducted MANOVA, and I have to groups (different nationality; Arabs and British)...

    Started by ghada8888‎, 11-22-2011 05:15 PM
    • Replies: 1
    • Views: 1,955
    11-26-2011, 06:46 PM Go to last post
  5. Wink Question about cluster analysis

    Hello, I am new to cluster analysis and I am trying to run some analysis based on some survey data I have. I have found a lot of information...

    Started by Johngr55‎, 11-28-2011 06:03 AM
    • Replies: 0
    • Views: 1,476
    11-28-2011, 06:03 AM Go to last post
  6. How to weight residents survey by demographics

    Hi I am analysing a residents survey and I am trying to find the best advice around how to weight the responses. I have calculated a matrix of...

    Started by wilbur750‎, 11-28-2011 07:39 AM
    • Replies: 0
    • Views: 1,791
    11-28-2011, 07:39 AM Go to last post
  7. Question I need help in my undergraduate project

    Hi all, I have conducted a questionnaire about factors affecting academic performance my sample size =300 students from different colleges...

    Started by Miss..Stats‎, 11-28-2011 04:50 PM
    • Replies: 9
    • Views: 2,789
    11-28-2011, 06:23 PM Go to last post
  8. significant interaction but variables not significant on their own

    Hi I was wondering if anyone could help me. I have been looking at consumers purchase intention levels across three indepedent variables, age,...

    Started by kassos‎, 11-22-2011 09:52 AM
    • Replies: 6
    • Views: 7,481
    11-30-2011, 12:38 PM Go to last post
  9. Where to start?

    I am trying to find the best way to identify the optimal quantity for packaging that reduces handling of product. example: Product 1 ...

    Started by JHallagin‎, 11-30-2011 02:41 PM
    • Replies: 2
    • Views: 1,450
    11-30-2011, 03:17 PM Go to last post
  10. Sum of independent beta-Bernoulli random variables

    I'm looking for the distribution of the sum of independent beta-Bernoulli random variables, that is Bernoulli random variables with beta-distributed...

    Started by SBlais‎, 11-30-2011 01:55 PM
    bernoulli distribution, beta distribution, binominal, distribution, mathematical statistics
    • Replies: 5
    • Views: 6,680
    11-30-2011, 04:36 PM Go to last post
  11. Help with work project

    I am attempting to do a statistical breakdown of the results from a competition we do here at my job each year. The competition has relavance, so...

    Started by swoody729‎, 11-29-2011 09:53 PM
    • Replies: 1
    • Views: 1,441
    11-30-2011, 05:47 PM Go to last post
  12. Question ANOVA Design and Analysis

    Hello, This is my first post so I hope my question is appropriate for the group. I have performed an experiment where we have blood samples...

    Started by penn whitley‎, 12-01-2011 06:06 PM
    anova, blocking, model, split-plot
    • Replies: 1
    • Views: 1,411
    12-02-2011, 02:33 AM Go to last post
  13. NOOB questions about Mancova, Ancova and multiple regression

    I'm a beginning grad student and having a tough time understanding how test results determine if there is reliability and validity. In the study...

    Started by julieo00‎, 12-01-2011 03:34 AM
    • Replies: 3
    • Views: 3,613
    12-02-2011, 09:58 AM Go to last post
  14. 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: 26,135
    12-03-2011, 03:52 PM Go to last post
  15. 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: 2,548
    12-03-2011, 04:05 PM Go to last post
  16. 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: 1,149
    12-03-2011, 07:36 PM Go to last post
  17. 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: 1,898
    12-08-2011, 02:37 AM Go to last post
  18. 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: 1,512
    12-08-2011, 08:24 AM Go to last post
  19. 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: 3,485
    12-08-2011, 03:19 PM Go to last post
  20. 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: 2,086
    12-09-2011, 02:31 PM Go to last post
  21. 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: 1,655
    12-09-2011, 09:40 PM Go to last post
  22. 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: 1,304
    12-11-2011, 05:45 PM Go to last post
  23. 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
  24. 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: 1,825
    12-13-2011, 07:51 PM Go to last post
  25. 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: 1,579
    12-15-2011, 04:45 AM Go to last post
  26. 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: 1,401
    12-15-2011, 12:19 PM Go to last post
  27. 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: 5,157
    12-15-2011, 04:17 PM Go to last post
  28. 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: 1,719
    12-16-2011, 04:28 PM Go to last post
  29. 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: 5,474
    12-16-2011, 09:43 PM Go to last post
  30. 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: 1,618
    12-18-2011, 08:00 PM Go to last post
  31. 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: 2,142
    12-19-2011, 02:47 AM Go to last post
  32. 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: 1,492
    12-22-2011, 05:27 AM Go to last post
  33. 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: 1,750
    12-23-2011, 12:27 PM Go to last post
  34. 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: 6,802
    12-24-2011, 03:10 AM Go to last post
  35. 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: 12,347
    12-27-2011, 02:48 PM Go to last post
  36. 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: 3,082
    12-29-2011, 05:40 AM 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: 4,035
    12-29-2011, 11:10 AM Go to last post
  38. 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: 2,576
    12-29-2011, 01:09 PM Go to last post
  39. 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: 3,591
    12-29-2011, 07:51 PM Go to last post
  40. 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: 7,002
    12-29-2011, 08:05 PM Go to last post
  41. 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: 3,875
    12-30-2011, 11:59 AM Go to last post
  42. 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: 2,088
    12-31-2011, 02:47 PM Go to last post
  43. 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: 4,206
    01-02-2012, 11:23 AM Go to last post
  44. 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: 1,553
    01-02-2012, 12:16 PM Go to last post
  45. 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: 1,270
    01-02-2012, 07:59 PM Go to last post
  46. 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: 1,796
    01-03-2012, 02:47 PM Go to last post
  47. 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: 2,661
    01-03-2012, 07:08 PM Go to last post
  48. 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: 1,441
    01-04-2012, 02:20 AM Go to last post
  49. 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: 1,705
    01-04-2012, 07:24 PM Go to last post
  50. 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: 3,081
    01-05-2012, 10:07 AM Go to last post
  51. 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: 13,213
    01-06-2012, 06:35 AM Go to last post
  52. 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: 2,025
    01-06-2012, 08:17 AM Go to last post
  53. 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: 3,990
    01-06-2012, 07:44 PM Go to last post
  54. 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: 2,383
    01-08-2012, 02:06 PM Go to last post
  55. 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: 1,238
    01-08-2012, 10:30 PM Go to last post
  56. 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: 2,171
    01-09-2012, 03:15 AM Go to last post
  57. 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: 3,270
    01-10-2012, 05:51 AM Go to last post
  58. 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: 1,274
    01-11-2012, 09:20 AM Go to last post
  59. 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: 1,454
    01-11-2012, 04:06 PM Go to last post
  60. 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: 1,353
    01-15-2012, 11:58 AM Go to last post

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