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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: 18,750
    10-11-2014, 12:02 PM Go to last post
  1. Need Help on Hypothesis testing

    Need help in understanding whether the method i am adopting is correct or not and what other tests i can include. I have a sample size of 720...

    Started by chintan‎, 04-29-2012 04:34 PM
    • Replies: 0
    • Views: 987
    04-29-2012, 04:34 PM Go to last post
  2. Distribution of estimator (exponential distribution; truncated at both ends)

    Good day forum, I've been struggling with for a while and would like to hear some thoughts on this one. I've got an exponential distribution,...

    Started by chippy‎, 07-13-2012 07:42 AM
    • Replies: 3
    • Views: 1,685
    11-05-2012, 01:57 PM Go to last post
  3. Bootstrap bias

    Good day forum, I'm using a bootstrap approach to get a better understanding of a sampling distribution. I've heard that the bootstrap approach...

    Started by chippy‎, 11-05-2012 01:49 PM
    bias, bootstrap, sampling distribution
    • Replies: 0
    • Views: 1,153
    11-05-2012, 01:49 PM Go to last post
  4. cross-validation of prognostic model (test-set method)

    I am cross-validating a logistic regression model using the test-set approach, with 70% training data in the test set and 30% in the validation "set"...

    Started by chipsens‎, 08-09-2011 08:23 AM
    cross-validation, regression, test-set
    • Replies: 0
    • Views: 2,389
    08-09-2011, 08:23 AM Go to last post
  5. Equivalent to RMSE for logistic regression?

    I understand that RMSE is a useful summary measure for assessing predictive power of regression model with continuous dependent Y. Is RMSE equally...

    Started by chipsens‎, 08-09-2011 09:58 AM
    prediction, rmse
    • Replies: 1
    • Views: 6,480
    08-09-2011, 10:54 AM Go to last post
  6. different intercept with Multinomial vs Binomial Logistic?

    I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was...

    Started by chipsens‎, 09-06-2011 03:02 PM
    logistic regression
    • Replies: 0
    • Views: 2,691
    09-06-2011, 03:02 PM Go to last post
  7. control vs exposed

    so i have 2 diffferent sample wherein the 1st sample is control and the 2nd sample is exposed to technology i.e in terms of exposure to Mobile...

    Started by chirax‎, 03-24-2014 02:32 AM
    • Replies: 0
    • Views: 1,774
    03-24-2014, 02:32 AM Go to last post
  8. 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
  9. Chi-square instead of Multiple Regression Analysis

    Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

    Started by choco21lit‎, 05-21-2016 11:45 AM
    • Replies: 0
    • Views: 869
    05-21-2016, 11:45 AM Go to last post
  10. Quick Chi-Square Question

    Hi all, I'm familiar with chi-square and have used it for a while at work. Just wondering something... When calculating the Chi-Square for each...

    Started by Chris Brunskill‎, 09-02-2011 08:51 AM
    • Replies: 4
    • Views: 2,264
    03-18-2014, 09:23 AM Go to last post
  11. choosing basic test: logistic regression or multiple chi square?

    -------------------------------------------------------------------------------- Hi, I'm new to statistics and am working on a project for...

    Started by Chris Webber‎, 06-22-2009 10:41 AM
    • Replies: 0
    • Views: 3,589
    06-22-2009, 10:41 AM Go to last post
  12. A Soccer/Football Ratings System - Home Advantage

    Hi guys, this is my first post. (So do lower your expectations) I'm currently writing a thesis that deal with sports probabilities and part of the...

    Started by chrishello92‎, 09-02-2015 12:48 AM
    • Replies: 2
    • Views: 3,651
    09-02-2015, 03:42 AM Go to last post
  13. Meta-analysis - Can I investigate mediation effects for the effectiveness of training

    Hello everyone, I am currently working on my Master thesis on moderators and mediators for the effectiveness of cross-cultural training (CCT). I...

    Started by ChristinaK91‎, 03-25-2017 11:34 AM
    mediating effect, mediator, meta-analysis
    • Replies: 0
    • Views: 1,057
    03-25-2017, 11:34 AM Go to last post
  14. Statistic test for comparing time budget?

    Hi all I am a beginner in statistics and I have the following difficulty. I video-recorded some animals in two populations and I calculated...

    Started by Christinec‎, 03-02-2017 03:44 AM
    • Replies: 1
    • Views: 1,507
    03-02-2017, 11:20 AM Go to last post
  15. Event Clustering in an Event Study

    Dear All, I conducted an Event-Study to assess price effects. Now the result show widely fluctuating abnormal returns. Since the event-date across...

    Started by Christoph‎, 02-06-2009 02:20 AM
    • Replies: 1
    • Views: 9,664
    03-09-2009, 08:41 AM Go to last post
  16. how to initiate statistical research, one dependent variable, many independt

    Hi guys For work, I've initiated this project. I've gathered data, now I'm gonna do the analysis. The objective is to find out where we get our...

    Started by christopherh‎, 02-14-2014 06:16 AM
    • Replies: 0
    • Views: 973
    02-14-2014, 06:16 AM Go to last post
  17. 2 Cubed Experiment

    Could some one give me an example of a 2 cubed experiment? I am having trouble thinking about one. I need an experiment to record 2 different...

    Started by ChrisYee90‎, 09-09-2012 03:36 PM
    • Replies: 0
    • Views: 1,392
    09-09-2012, 03:36 PM Go to last post
  18. multicollinearity help with control variable

    Please can someone help me. I am looking at the effect of board ownership on stock performance and using ln market cap as the control variable....

    Started by chris_‎, 09-05-2012 03:58 PM
    • Replies: 0
    • Views: 1,229
    09-05-2012, 03:58 PM Go to last post
  19. Sample Size Calculation (HELP!)

    Hi all, I wish someone could help me out. I am trying to estimate the sample size for a national health survey. From the previous report,...

    Started by chummsy‎, 10-12-2016 08:29 PM
    • Replies: 1
    • Views: 1,974
    10-15-2016, 09:44 AM Go to last post
  20. Can I use a chi-square test for this 2x3 contingency table?

    Imagine I want to find out whether there are any differences between male and female participants in their pet choices, and this is my 2x3...

    Started by cidyla‎, 07-26-2012 05:17 PM
    chi-square, proportions
    • Replies: 1
    • Views: 19,043
    07-26-2012, 09:30 PM Go to last post
  21. Multidimensional Scaling - Can I split the comparisons between respondents?

    Good evening, For my master thesis I am conducting research in which I want to make decompositional comparisons for Multidimensional Scaling with...

    Started by CindyD93‎, 06-05-2014 01:51 PM
    comparisons, decompositional, mds, multidimensional scaling, split
    • Replies: 0
    • Views: 1,656
    06-05-2014, 01:51 PM Go to last post
  22. Which method to use? ANOVA, one way regression, or else?

    Hi guys, For my research I have an independent variable 'education', which varies from 1 (low) to 6 (high) and a dependent dummy variable which is...

    Started by CindyD93‎, 08-02-2014 04:05 AM
    anova, dummy, regression, spss
    • Replies: 7
    • Views: 1,808
    08-03-2014, 02:52 AM Go to last post
  23. Citation needed for removing 3 Stdev outliers

    Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

    Started by civiloscar‎, 07-30-2012 02:21 PM
    citation, outliers, standard deviation
    • Replies: 3
    • Views: 2,720
    07-30-2012, 04:51 PM Go to last post
  24. Calculate CI for Var of sum of normally dist variables?

    Hi guys, I'm trying to figure out how to calculate a confidence interval for a variable that is the sum of normally distributed variables. ...

    Started by CJ Rockball‎, 02-02-2014 10:39 AM
    • Replies: 0
    • Views: 901
    02-02-2014, 10:39 AM Go to last post
  25. What is the purpose of inferential statistical tests when you already have parameters

    Hello, I'm an undergraduate political science student, and I am working on my senior thesis. I've collected data on a small population (N = 129)....

    Started by cjc110244‎, 12-28-2015 05:55 PM
    • Replies: 2
    • Views: 1,136
    12-29-2015, 11:15 AM Go to last post
  26. A Simple Meta-Analysis query

    Hi All, I am working on my first meta-analysis project and this may sound silly, but I am having difficulty deciding which studies to include. ...

    Started by claireH‎, 10-10-2008 04:50 AM
    • Replies: 0
    • Views: 2,452
    10-10-2008, 04:50 AM Go to last post
  27. Issue in Interpreting SPSS output of GLM repeated measures

    I have a data set with repeated measures for each individual. That is there a re two groups, treatment and control. And each individual is measured...

    Started by Clarkson‎, 06-10-2015 01:43 AM
    glm-anova, repeated measures, spss
    • Replies: 0
    • Views: 1,062
    06-10-2015, 01:43 AM Go to last post
  28. What is the proper way to divide a skewed dataset into high, medium, and low interval

    I don't know if this is the proper forum for this. Hello, I have a skewed dataset, and I am dividing it into high, medium and low values. I don't...

    Started by clazu‎, 01-23-2011 01:23 AM
    • Replies: 2
    • Views: 6,840
    01-24-2011, 11:37 AM Go to last post
  29. 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: 4,213
    01-02-2012, 11:23 AM Go to last post
  30. Survey on how frequently a group use a particular device: Which analysis methods?

    I surveyed a group of photographers and asked them how frequently they used a particular type of lens for a specific type of photograph. I now want...

    Started by clivegibbs‎, 11-08-2016 06:51 AM
    friedman test, survey, wilcoxon
    • Replies: 0
    • Views: 2,504
    11-08-2016, 06:51 AM Go to last post
  31. What test should have been used...

    Done with the assignment ... No replies :(

    Started by cloud‎, 10-15-2013 08:35 PM
    • Replies: 0
    • Views: 1,391
    10-15-2013, 08:35 PM Go to last post
  32. Stat used in Med Articles - HELP

    Hi Folks, Just to let you know I didn't even know where to post the thread, so apologize if I am in the wrong section :) I am reviewing articles...

    Started by cloud‎, 10-08-2013 08:55 PM
    • Replies: 9
    • Views: 1,773
    10-09-2013, 04:55 AM Go to last post
  33. Conditional expectation

    Hi everyone, I've usually seen the conditional mean of X_n given X_1,X_2,.X_n-1 expressed as shown on p. 5 of: ...

    Started by CLP_PS‎, 06-06-2014 02:07 PM
    • Replies: 5
    • Views: 2,542
    06-10-2014, 12:37 AM Go to last post
  34. 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: 4,877
    08-18-2008, 12:07 PM Go to last post
  35. Question Regarding Research Design

    If I have a dataset with 100 unspecified cases and I know from a previous chart review that the likelihood is that 10% of these are indeed cases how...

    Started by cmcm855‎, 05-10-2015 07:28 PM
    • Replies: 2
    • Views: 1,316
    05-10-2015, 10:47 PM Go to last post
  36. Sample size of US prison population....

    So, I'm doing research on economic background of people in US prisons and have to collect the data manually so I'm wondering how many I really need...

    Started by cms‎, 08-10-2013 01:11 PM
    • Replies: 3
    • Views: 2,654
    08-12-2013, 07:56 AM Go to last post
  37. Best Approach

    Hi, I am looking to analyse a data set consisting of one dependent variable - respondent satisfaction values ranging from 1 to 10 - with three...

    Started by cockett7‎, 02-22-2011 06:42 PM
    • Replies: 2
    • Views: 2,445
    02-23-2011, 11:38 AM Go to last post
  38. Help assessing convergence across categorical responses

    Hi folks I posted this in the SPSS section, but its actually more a question about which test to use so I think it belongs here. I'm working...

    Started by COFisher‎, 03-05-2015 11:07 AM
    • Replies: 0
    • Views: 930
    03-05-2015, 11:07 AM Go to last post
  39. 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: 3,051
    05-30-2007, 12:02 AM Go to last post
  40. Test of Significance?

    I want to conduct a significance test in finding the significance between either a C+ vs a B- in AP statistics class will affect chances of attending...

    Started by columbia‎, 06-21-2011 09:49 PM
    3 Pages
    1 2 3
    • Replies: 42
    • Views: 7,702
    06-24-2011, 06:30 PM Go to last post
  41. Excel sample size comparison

    I have two independent groups that tested their own sample size (based on their group's sampling rules) of the same data for process failures. Group...

    Started by Compliance Carl‎, 09-18-2017 12:47 PM
    compliance, defect data
    • Replies: 0
    • Views: 266
    09-18-2017, 12:47 PM Go to last post
  42. Wilcoxon and Anova? Confused!

    HI! I'm really quite new to stats so I apologise for glaring foolishness :P Basically in the study that I'm looking at is a within-subjects...

    Started by confused.stats‎, 04-04-2014 06:50 AM
    • Replies: 0
    • Views: 1,942
    04-04-2014, 06:50 AM Go to last post
  43. Comparing confidence intervals: CI of mean vs CI of regression coefficient

    Hi, I have longitudinal data with measurements at two timepoints. I am interested in the change per year and calculated this in two ways: *...

    Started by confusedscientist‎, 06-22-2012 08:28 AM
    confidence interval, linear regression
    • Replies: 0
    • Views: 1,837
    06-22-2012, 08:28 AM Go to last post
  44. Help with choice of nonparametric?

    Hello, I have a very small sample, n=6 for an exploratory pilot study. I want to correlate the variables i have to see if there are any...

    Started by Confused_Claire‎, 11-06-2010 08:33 AM
    • Replies: 2
    • Views: 2,516
    11-07-2010, 02:57 AM Go to last post
  45. Help deciding which analysis to run

    Hi all, I'm doing a study and having trouble deciding on the appropriate analysis. I'll give a simple example of what I'm trying to do and any help...

    Started by conrad2012‎, 03-23-2012 02:50 PM
    • Replies: 0
    • Views: 959
    03-23-2012, 02:50 PM Go to last post
  46. General Term for Models with Dependend and Independend Variables

    Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

    Started by consuli‎, 01-24-2015 09:42 AM
    • Replies: 3
    • Views: 2,469
    01-26-2015, 06:44 AM Go to last post
  47. Types of Predictive Models

    Among the predictive models there are some, 1. which deliver exactly one solution for the estimation problem (e.g. regression, GLM, ...) 2....

    Started by consuli‎, 01-26-2015 08:50 AM
    • Replies: 0
    • Views: 1,203
    01-26-2015, 08:50 AM Go to last post
  48. Literature regarding Multinomial Logit Regression

    Hello, I am looking for helpful links and literature regarding the logit regression with a multinomial target variable aka multinomial GLM. ...

    Started by consuli‎, 02-12-2015 08:06 AM
    • Replies: 0
    • Views: 900
    02-12-2015, 08:06 AM Go to last post
  49. How to generate multiple correlated variables?

    Hello! One can generate two c0rrelated variables as follows: x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal random variable...

    Started by consuli‎, 02-18-2015 07:33 AM
    • Replies: 2
    • Views: 1,974
    02-19-2015, 12:15 PM Go to last post
  50. How to alter the standard deviation of an empirical distribution?

    For the purpose of a simulation I need to increase the standard deviation of an empirical distribution. I want to simulate what will happen if the...

    Started by consuli‎, 02-21-2015 09:46 AM
    • Replies: 4
    • Views: 2,112
    02-21-2015, 05:46 PM Go to last post
  51. Maximum Likelihood Estimator for a Transformed Uniorm Distribution

    Hello, I have got a transformed uniform distribution. The distribution is of the form: v= u^w Where u: uniform distributed variable w:...

    Started by consuli‎, 02-23-2015 06:21 AM
    • Replies: 0
    • Views: 940
    02-23-2015, 06:21 AM Go to last post
  52. Transformation of a Uniform Distribution needed

    Hello, I have got a crazy distributed p4. (See file attachment). How can I transform a uniform distribution into the one of p4? Probit...

    Started by consuli‎, 02-24-2015 09:45 AM
    • Replies: 2
    • Views: 1,168
    02-24-2015, 12:02 PM Go to last post
  53. How to generate an autocorrelated random variable?

    Hi, I know I can generate two correlated random variables x1 an x2 using x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal...

    Started by consuli‎, 03-04-2015 05:06 PM
    2 Pages
    1 2
    autocorrelation
    • Replies: 15
    • Views: 4,962
    03-11-2015, 01:08 PM Go to last post
  54. Book for Applied Panel Data Analysis

    Hello, I am looking for a book with the topic applied panel data analysis. I already had a look on these ones: ANALYZING PANEL DATA (P) This...

    Started by consuli1‎, 10-03-2013 10:43 AM
    • Replies: 0
    • Views: 1,229
    10-03-2013, 10:43 AM Go to last post
  55. Does the NSA random number generator backdoor affect statistical random nummbers?

    Hello, in my computer magazine I read 1 month ago, that the NSA has inserted a backdoor in the random number generating circuit on Intel...

    Started by consuli1‎, 01-17-2014 01:29 PM
    art bell, coast to coast
    • Replies: 1
    • Views: 2,107
    01-17-2014, 06:29 PM Go to last post
  56. GLM on bimodal Data possible?

    Hello, I've got data, in which the target variable is bimodally distributed. The target variable is also bimodally distributed conditional on the...

    Started by consuli1‎, 04-29-2014 03:57 PM
    • Replies: 0
    • Views: 2,470
    04-29-2014, 03:57 PM Go to last post
  57. Choosing right ANOVA & how to input data

    Hi, Need help with an issue. I'm not quite sure how to input the data I've collected and I'm guessing I should use ANOVA RM, but not 100% sure...

    Started by Conxile‎, 04-24-2014 02:56 PM
    • Replies: 0
    • Views: 828
    04-24-2014, 02:56 PM Go to last post
  58. Nonparametric for paired, but unequal sample size

    Hi, I'm in the midst of writing my master thesis, but I'm having issues with the statistics. I've measured muscle cells. In short, I've 4...

    Started by Conxile‎, 03-14-2016 04:47 AM
    • Replies: 4
    • Views: 1,183
    03-14-2016, 10:29 AM Go to last post
  59. Can they called unequal sample sizes and t-test/ANOVA?

    I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

    Started by cookiemonster‎, 05-02-2011 03:09 AM
    • Replies: 0
    • Views: 2,767
    05-02-2011, 03:09 AM Go to last post
  60. SOS!Correct name of sampling method.

    Dear all, please help me as I have to finish my dissertation in one week and I unfortunately cannot find the correct name for the sampling method...

    Started by Copenhagen‎, 08-04-2013 01:48 PM
    • Replies: 1
    • Views: 1,347
    08-04-2013, 02:02 PM Go to last post

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