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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: 18,756
    10-11-2014, 12:02 PM Go to last post
  1. Sample Size - Mathematical proof

    Hi, I am currently trying to find out the mathematical proof for my chosen sample size. I have referred to the table below and found out that my...

    Started by jpv90‎, 12-06-2012 09:16 AM
    • Replies: 2
    • Views: 3,121
    12-21-2012, 11:53 AM Go to last post
  2. The joint normality of the two estimates for linear regression model

    I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

    Started by waynetang‎, 12-21-2012 12:46 PM
    • Replies: 13
    • Views: 3,118
    12-22-2012, 12:27 PM Go to last post
  3. Moderated Mediation Macro Limitations

    Hello! I am currently working on my thesis and my data seems to fit a moderated mediation model but I'm up against some of the MODMED limitations....

    Started by syzergy‎, 07-13-2013 04:48 PM
    • Replies: 6
    • Views: 3,110
    07-13-2013, 05:43 PM Go to last post
  4. Symmetry Model Categorical Data Analysis

    Does ANYONE understand the symmetry model for categorical data analysis by Agresti? I have a Likert scale that places students into 4 categories. I...

    Started by KFTaiChi‎, 12-20-2008 07:15 PM
    • Replies: 1
    • Views: 3,109
    12-29-2008, 12:34 AM Go to last post
  5. Likert/Chi-square

    Hello, I'm working on my analysis of my Graduate Capstone Project and was hoping to get some feedback to see if what I plan on doing is correct. ...

    Started by Fly_Navy‎, 11-28-2010 02:21 PM
    • Replies: 1
    • Views: 3,109
    12-15-2010, 09:34 PM Go to last post
  6. Question on Bootstrap Inference

    Hi All, Say I have a time series X of length T that is split into two subperiods: X1 = X(0),X(1),...,X(T-n) and X2 = X(T-n+1),X(T-n+2),...,X(T),...

    Started by resetzero‎, 01-26-2011 04:38 AM
    • Replies: 0
    • Views: 3,105
    01-26-2011, 04:38 AM Go to last post
  7. Unobserver Component Models for Forecasting vs ARIMA and Expoential Smoothing

    Hello, I read in textbooks and in forecasting software manuals that Unobserverd Components Models have the flexibility and are as powerfull as...

    Started by zarasandreas‎, 10-15-2011 12:00 PM
    • Replies: 0
    • Views: 3,104
    10-15-2011, 12:00 PM Go to last post
  8. Estimated Parameter as Dependent Variable

    Hi, Would anybody be able to help me with the following problem? That would be great!! :) In my analysis I follow a two-step approach. In the...

    Started by Maya_L‎, 12-01-2016 02:06 PM
    bootstraping, error term, estimated parameter
    • Replies: 2
    • Views: 3,104
    12-01-2016, 02:37 PM Go to last post
  9. VERY RELEVANT MORTGAGE-RESEARCH in this crisis

    Within the firm I work for the question exists whether there are common characteristics within (between) more or less 900 cases/dossiers which we...

    Started by dennishoogeboom‎, 05-18-2009 05:05 AM
    • Replies: 4
    • Views: 3,102
    05-27-2009, 08:39 PM Go to last post
  10. Question Friedman test -- post hoc

    Good day, I am willing to compare n sample means (where n > 2) of random variables. I am willing to use Friedman test to see if there is any...

    Started by mjomran‎, 11-12-2011 03:02 PM
    • Replies: 0
    • Views: 3,102
    11-12-2011, 03:02 PM Go to last post
  11. 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
  12. categorical variable as covariate in ANOVA?

    Hi, I have a within-subject factor with 3 levels and find no main effect when I do an ANOVA. I kind of predict that this is due to the...

    Started by OS449‎, 01-19-2013 09:31 AM
    • Replies: 1
    • Views: 3,098
    01-22-2013, 10:47 AM Go to last post
  13. obtain inter-aarival from bulk arrival

    I have some data regarding the arrival of customers at a shop. These arrivals are bulk arrivals which have been collected at fixed time intervals...

    Started by mohsenhs82‎, 02-16-2017 05:22 PM
    2 Pages
    1 2
    arrival time, probabilities, queuing theory, random variable, stochastic
    • Replies: 16
    • Views: 3,095
    02-19-2017, 05:24 PM Go to last post
  14. 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: 3,092
    03-24-2011, 11:47 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: 3,090
    08-17-2010, 01:08 PM Go to last post
  16. 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
  17. fixed or random factor for ANOVA

    I've had a discussion with a colleague over the proper way to analyse results of an experiment. We tested the performance of 6 subjects in a...

    Started by sam81‎, 09-19-2011 07:06 AM
    anova, fixed effects, random effects
    • Replies: 1
    • Views: 3,087
    09-19-2011, 08:12 PM Go to last post
  18. inter-rater reliability with multiple raters - sample size determination

    Hi I will have to condact a obserbational test with multiple raters. Basically the raters have to obserbe subjects, and rate (categorical data) the...

    Started by JFI‎, 09-25-2012 03:41 PM
    • Replies: 0
    • Views: 3,082
    09-25-2012, 03:41 PM Go to last post
  19. Cohort

    Hi everyone Is sent my research proposal to ethic committee, the study design is prospective cohort. I got a reply that i should change my study...

    Started by dockiss‎, 11-16-2011 09:51 AM
    • Replies: 4
    • Views: 3,080
    11-18-2011, 01:04 PM Go to last post
  20. Numerical Maximization of Massive Expression

    Hey,guys! I am real sorry if the question has been already asked, but I am really stuck with something.... I have a Likelihood Function , it...

    Started by Valen‎, 01-26-2011 08:31 AM
    • Replies: 4
    • Views: 3,076
    01-26-2011, 05:01 PM Go to last post
  21. HLM or MANOVA/MANCOVA

    Hello, For my study, I will use a data set that includes 22 schools, 2 to 20 teachers in each school, and 4 students from each teachers'...

    Started by HHH‎, 11-11-2014 10:27 AM
    • Replies: 0
    • Views: 3,073
    11-11-2014, 10:27 AM Go to last post
  22. Choosing bachelor's thesis topic

    Hello everyone. I am going to make research on statistics/data analysis for my bachelor's thesis. What are the popular areas of research in...

    Started by nail-uwec‎, 11-19-2016 09:49 AM
    • Replies: 0
    • Views: 3,068
    11-19-2016, 09:49 AM Go to last post
  23. Mixed Model Covariance Structure

    I have a study with a somewhat unique experimental design which I would like to used Mixed Modeling to analyze. All subjects in the study were...

    Started by jmike‎, 03-24-2011 08:28 PM
    covariance, mixed methods, mixed models
    • Replies: 0
    • Views: 3,064
    03-24-2011, 08:28 PM Go to last post
  24. Justification for Levene's test?

    Take an example where the variance of two samples is truly heterogeneous: Sample 1 weights - 100, 140, 160, 200 Sample 2 weights - 10, 14, 16, 20 ...

    Started by emily.stats‎, 11-22-2012 09:31 AM
    • Replies: 7
    • Views: 3,061
    11-28-2012, 06:27 AM Go to last post
  25. Student's T-test versus one-way ANOVA

    I need help on deciding which statistical test to report. This is not really a statistics problem per say, I've done the calculations already. My...

    Started by GrungyGoose‎, 04-05-2014 10:17 PM
    anova, students t test
    • Replies: 1
    • Views: 3,060
    04-06-2014, 09:45 AM Go to last post
  26. sure independence screening in clustering

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

    Started by Amir91‎, 11-22-2016 02:39 AM
    clustering, screening
    • Replies: 3
    • Views: 3,059
    11-23-2016, 01:01 AM Go to last post
  27. Hypothesis Testing question. Is it Null or Alternative? More details.

    Hello. I'm new here and its going to be my first thread(excluding my introduction thread). I hope I'm posting this thread on the right section. ...

    Started by b8erxwt‎, 10-01-2011 12:57 PM
    • Replies: 1
    • Views: 3,056
    10-03-2011, 04:39 PM Go to last post
  28. Kruskal Wallis test and problem with zeros

    Hi. I am conducting a biological research about species abundance variations between different hours and localitions. I am comparing 11...

    Started by sureño‎, 07-09-2012 07:19 PM
    kruskal wallis, non parametric, zeros
    • Replies: 0
    • Views: 3,055
    07-09-2012, 07:19 PM Go to last post
  29. Exclamation what am i supposed to do?

    Let X_1,X_2,........,X_n ~ N(\mu,\sigma^2), both \mu and \sigma^2 unknown. Find the value of b which minimizes the MSE of the estimator...

    Started by Sambit‎, 11-02-2010 01:51 AM
    • Replies: 8
    • Views: 3,053
    11-02-2010, 11:22 AM Go to last post
  30. T scores & a Multivariate Analysis

    4 tests were administered to 2 different groups. The scales of measurement for the tests were different, so the raw scores were converted to...

    Started by colorfulbouquet‎, 01-29-2007 11:31 AM
    • Replies: 1
    • Views: 3,052
    05-30-2007, 12:02 AM Go to last post
  31. Several distributions -how to choose between parametric/nonparametric test

    Hello all! I have 56 distributions and I'm trying to decide whether to use parametric or nonparametric test (only one for all). I used Lilliefors...

    Started by Tikkuhirvio‎, 07-14-2011 05:55 AM
    • Replies: 2
    • Views: 3,052
    07-15-2011, 07:18 AM Go to last post
  32. Lanczos' Algorithm for Sparse Matrices

    I just have a quick question about the implementation of lanczos' algorithm. If you are unfamiliar with it, it can be found at...

    Started by senorbum‎, 06-24-2008 10:44 AM
    • Replies: 0
    • Views: 3,050
    06-24-2008, 10:44 AM Go to last post
  33. Nonparametric regression

    Hi guys, can someone recommend a good source to learn about kernel regression or spline smoothing and perhaps how to compare two plots to each other?

    Started by chickduckduck‎, 11-16-2009 04:50 AM
    • Replies: 2
    • Views: 3,047
    11-17-2009, 01:06 AM Go to last post
  34. Correct measure of central tendency for Skewed distribution

    Dear Talk Stats users, I am trying to solve following problem. I've got a data, which has a skewed distriubution (see attachment ) Now I can...

    Started by Namba‎, 10-30-2014 06:33 AM
    • Replies: 6
    • Views: 3,047
    10-30-2014, 11:26 AM Go to last post
  35. Likert scale - questionnaire administered twice - longitudinal study

    Hi, I am running a longitudinal study which lasted for few months during which all participants used a specific communicaiton device. I conducted...

    Started by A_n_y_a‎, 04-21-2011 03:18 PM
    administered twice, likert scale, longitudinal study, questionnaire
    • Replies: 1
    • Views: 3,040
    04-22-2011, 06:34 PM Go to last post
  36. Combining Variables to Fill Missing Data

    Summary of Problem: 1. I want to combine three similar variables to fill severe missing data problem. Significance of problem: 1. My data is...

    Started by williamsons‎, 12-02-2010 05:19 AM
    • Replies: 0
    • Views: 3,039
    12-02-2010, 05:19 AM Go to last post
  37. Tests for Change in Mean Dependent data

    Hello, I am doing research on change point analysis. I am working on the attached paper and I'm trying to see where the number in Table 1 are...

    Started by SVM‎, 01-14-2009 12:52 AM
    • Replies: 0
    • Views: 3,037
    01-14-2009, 12:52 AM Go to last post
  38. metropolis algorithm for ising model

    Hi i'm looking for some help with trying to understand how to use the metropolis algorithm for the 2D ising model. In the problem i am trying to...

    Started by vitaniarain‎, 11-19-2010 06:34 AM
    • Replies: 0
    • Views: 3,035
    11-19-2010, 06:34 AM Go to last post
  39. Kaplan-Meier: Overall time longer than 2 factors

    I have an SPSS output of a Kaplan-Meier in which I compared to factors. The overall mean survival time is longer than the 2 factors. Is this because...

    Started by sheederj‎, 05-27-2008 09:35 AM
    • Replies: 0
    • Views: 3,034
    05-27-2008, 09:35 AM Go to last post
  40. Dealing with regression to the mean

    If I have two time points T1 and T2 and separate the groups based on their performance at T1 (High v Low), then after treatment assess their...

    Started by Palermo‎, 01-11-2017 08:10 AM
    • Replies: 4
    • Views: 3,034
    01-12-2017, 10:52 PM Go to last post
  41. Post How to do this power study?

    Suppose I have a function f(x) = { 0 if 0 =< x < 0.5 { Beta=0.5 if 0.5 =< x =< 1 y = f(x) +...

    Started by SVM‎, 01-17-2009 11:22 PM
    • Replies: 0
    • Views: 3,033
    01-17-2009, 11:22 PM Go to last post
  42. 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: 3,032
    03-25-2010, 04:24 AM Go to last post
  43. attrition: comparing *surviving* sample to original

    Hi, I have a question about attrition analyses in longitudinal databases. I know that I can compare the subjects who dropped out...

    Started by foreverpostdoc‎, 11-15-2006 11:45 AM
    • Replies: 4
    • Views: 3,030
    11-19-2006, 03:33 PM Go to last post
  44. 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: 3,022
    08-06-2010, 10:55 AM Go to last post
  45. 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: 3,021
    06-21-2010, 11:54 PM Go to last post
  46. What non-parametric test should I use?

    Hi all, I am looking for some help on finding an appropriate test to analyse the variance between groups. The data I am assessing is: -...

    Started by Nath‎, 12-20-2016 10:48 AM
    • Replies: 1
    • Views: 3,020
    12-21-2016, 01:24 AM Go to last post
  47. G*Power 3.12 Help

    Hi all, I'm brand new to the forum and relatively new to the world of research. I'm an undergraduate preparing for graduate studies. If this is...

    Started by Ryman1510‎, 01-06-2011 11:09 AM
    • Replies: 0
    • Views: 3,019
    01-06-2011, 11:09 AM Go to last post
  48. Question Pearson's chi-test for more than 2x2

    So, I have one stat book (Discovering Statistics by Andy Field; great book) that discusses Pearson's chi-test and how it's only applicable to a 2x2...

    Started by Trolle‎, 08-22-2012 12:27 PM
    chi square, contingency table, pearson chi square, spss
    • Replies: 2
    • Views: 3,012
    08-23-2012, 04:30 AM Go to last post
  49. 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: 3,010
    08-05-2010, 01:13 PM Go to last post
  50. von Neumann test for trend analysis

    Hi! Recently, I’ve come across von Neumann test for trend detection. I cannot find whether it has any particular assumptions – any info (as well...

    Started by mcdomell‎, 06-03-2013 05:49 AM
    trend analysis, trend detection, von neumann test
    • Replies: 0
    • Views: 3,010
    06-03-2013, 05:49 AM Go to last post
  51. p-value for nearest neighbor classification

    Hi all, For the past few days, I have been trying to compute a p-value for some experiment I ran recently, and I simply cannot figure it out. ...

    Started by popolon‎, 11-23-2013 11:57 AM
    • Replies: 4
    • Views: 3,009
    11-24-2013, 03:58 AM Go to last post
  52. HLM-Longitudinal Analysis: Moderation in level 2 variables?

    Hi, I am creating a growth model using HLM 7 where Level 1 is Occasion and Level 2 is Person. I am trying to see if I can test the moderation...

    Started by Blair‎, 12-11-2012 07:11 PM
    growth model, hlm, longitudinal, moderation
    • Replies: 0
    • Views: 3,005
    12-11-2012, 07:11 PM Go to last post
  53. Bayesian approach to comparing parameters of two distributions

    This is my first post here, and I'm hoping that someone can help me with a stats problem. I don't have much formal training, but I'll do my best to...

    Started by zipp83‎, 05-09-2012 02:27 AM
    • Replies: 4
    • Views: 3,004
    05-09-2012, 02:20 PM Go to last post
  54. How many random events to cover everything with 95% confidence?

    Ok so I have what I believe to be a rather easy question, which I even feel I should be able to solve myself, but I can't... I hope someone can help...

    Started by I_do‎, 09-15-2010 02:28 PM
    • Replies: 4
    • Views: 3,002
    09-22-2010, 03:14 AM Go to last post
  55. Question question about null hypothesis??

    here is my question: in my minor thesis, based on my theoretical framework, i have a hypothesis that stated that: "the score of group A is the same...

    Started by heymandy‎, 01-25-2012 11:54 PM
    hypothesis
    • Replies: 7
    • Views: 3,002
    01-27-2012, 04:37 AM Go to last post
  56. What is Endogeneity?

    Hi! The title says it all. I am a health care worker currently going through a really interesting paper. I have some experience in statistics but...

    Started by plagoniste‎, 09-17-2015 03:31 PM
    • Replies: 11
    • Views: 3,001
    09-17-2015, 08:44 PM Go to last post
  57. two probability levels in regression tables

    I was wondering if is is common practice to identify betas that are significant at either the .05 and .001 level. e.g., If I decide to set my p level...

    Started by godfather‎, 06-24-2009 01:14 AM
    • Replies: 1
    • Views: 2,999
    06-24-2009, 01:24 AM Go to last post
  58. Generalized estimating equations and multiple imputation

    Hi, I'm running a Generalized estimating equation model with multiple imputed data but I can not get a pooled outcome. Do anyone have a solution to...

    Started by Ulrik‎, 10-29-2014 03:54 AM
    gee multiple imputation
    • Replies: 4
    • Views: 2,999
    10-29-2014, 03:06 PM Go to last post
  59. MANOVA Help

    Help me please! I do not know how to interpret these stats...can someone help me answer these and explain how you got the answers... Box's Test of...

    Started by lostintranslation14‎, 05-08-2011 10:47 PM
    • Replies: 0
    • Views: 2,998
    05-08-2011, 10:47 PM Go to last post
  60. 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: 2,993
    07-06-2010, 08:36 PM Go to last post

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