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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: 18,742
    10-11-2014, 12:02 PM Go to last post
  1. Lightbulb Using Kendall test to find correlation between Likert type data

    Greetings! I am doing a small experiment and I was wondering if I have the correct method for analysing the data. Two groups of participants...

    Started by kutlak.roman‎, 01-19-2011 11:31 AM
    analysis, correlation, data, kendall, likert
    • Replies: 0
    • Views: 4,267
    01-19-2011, 11:31 AM Go to last post
  2. Transition matrix of a Markov chain with a given limiting distrubuti

    I want to create a transition matrix P (e.g. 4x4) for a stationary Markov chain with a given limiting distribution p, but I want P to bear as much...

    Started by efl86‎, 01-08-2010 12:41 PM
    • Replies: 1
    • Views: 4,259
    04-08-2010, 08:44 PM Go to last post
  3. Comparing two groups - best test to use?

    Hi all, I have two sets of data - hospital admission lengths (measured in whole hours) grouped in to 'younger patients' and 'older patients'....

    Started by AbnormallyDistributed‎, 08-29-2016 10:48 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,252
    09-06-2016, 03:43 PM Go to last post
  4. Categorical covariate in ancova??

    I have 1 continuous IV, one categorical IV and one continuous DV. Normally you'd investigate the effect of the categorical IV on the DV, corrected...

    Started by kelvarnsen‎, 03-28-2013 02:46 PM
    • Replies: 1
    • Views: 4,242
    04-08-2013, 06:03 PM Go to last post
  5. Principal Component Analysis

    hi guys, sorry to bother you. would like to seek help on principal component analysis regarding the interpretation of data or on how its going...

    Started by abdul.karim‎, 03-26-2011 02:12 AM
    • Replies: 1
    • Views: 4,240
    08-01-2012, 03:32 AM Go to last post
  6. Need help in finding historic data on real interest rate and CPI

    Hi everyone, In my research I use several financial instruments including real interest rate and real CPI. So far, I have been unable to find any...

    Started by E574‎, 05-18-2011 11:28 AM
    • Replies: 3
    • Views: 4,237
    05-21-2011, 10:01 AM Go to last post
  7. Rolling regressions

    Hi everybody, I was wondering if any of you have any experience with rolling regressions and how to calculate significance when using them. I...

    Started by StatisTicklish‎, 11-20-2009 10:51 AM
    • Replies: 0
    • Views: 4,232
    11-20-2009, 10:51 AM Go to last post
  8. Exogenous and Endogenous Variables

    How can you identify exogenous and endogenous variables from a chart that uses arrows and slings?

    Started by et4u77‎, 02-10-2010 04:04 PM
    • Replies: 1
    • Views: 4,228
    02-12-2010, 03:17 AM Go to last post
  9. How do i add 5 spss freq count tables together?

    Please can anyone help? I use spss (DOS version) and need to add five variables together. THey are all the same and contain the same values. When...

    Started by lisa131067‎, 03-01-2009 02:08 PM
    • Replies: 1
    • Views: 4,221
    03-01-2009, 07:22 PM Go to last post
  10. Why does anyone bother to post questions here?

    A very large number have no answers. What's the point?

    Started by hcc‎, 06-02-2015 11:52 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 4,219
    06-05-2015, 05:18 AM Go to last post
  11. DOE for Logistic Regression

    Hello- Does anyone have any references for DOE (especially multivariate testing / Taguchi) for binary response variables (analyzing with Logistic...

    Started by B_Miner‎, 08-28-2008 09:31 AM
    • Replies: 5
    • Views: 4,218
    08-28-2008, 11:18 AM Go to last post
  12. reliability using split half method

    HI, I am supposed to do my reliability of my tool which has 30 questions MCQ type and the scoring is 0 and 1(correct answer),,,how am i supposed to...

    Started by Amit Barve‎, 11-16-2011 01:39 PM
    • Replies: 0
    • Views: 4,216
    11-16-2011, 01:39 PM Go to last post
  13. 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: 4,212
    01-02-2012, 11:23 AM Go to last post
  14. 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: 4,202
    07-06-2010, 09:40 PM Go to last post
  15. What is the opposite of partial differentiation?

    Hi all This is in context with my earlier post (28/09) on Rearward Amplification, but it does not necessarily need to be read. I have had a...

    Started by gidon‎, 10-09-2011 07:58 AM
    • Replies: 0
    • Views: 4,187
    10-09-2011, 07:58 AM Go to last post
  16. Difference between two independent proportions

    Hello, I am not a statistician, however, for my latest small research, I would like to test whether there is a difference between two independent...

    Started by Zuzanah‎, 11-07-2016 07:10 AM
    chi-square, proportion test, z-test
    • Replies: 4
    • Views: 4,184
    03-03-2017, 01:48 PM Go to last post
  17. Suppressor

    Hi, I am attempting to conduct a regression analysis in a study examining patient and caregiver variables and their impact on formal care...

    Started by Roisin0103‎, 04-03-2009 09:44 AM
    • Replies: 2
    • Views: 4,178
    06-17-2009, 04:18 PM Go to last post
  18. GOF / Diagnostics for a GLM Binomial-Logit Family Model STATA

    Hello, I am using a GLM Binomial-Logit Family Model. I am using this model because my dependent variable is a proportion. Having carried out the...

    Started by Alicia2010‎, 05-20-2010 03:59 AM
    • Replies: 0
    • Views: 4,175
    05-20-2010, 03:59 AM Go to last post
  19. Bayesian t-test

    Hello I tried looking for a simple explanation with an example of how to perform a procedure that will be equivalent to the t-test using Bayesian...

    Started by NN_STAT‎, 05-08-2012 02:07 AM
    • Replies: 4
    • Views: 4,174
    05-11-2012, 06:11 AM Go to last post
  20. 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: 4,173
    08-10-2010, 07:59 AM Go to last post
  21. Help with bimodal distribution

    I have a bimodal distribution which I think is made up of 2 normal distributions. How can I tell the 2 distributions apart? In other words I would...

    Started by mousme‎, 11-26-2009 09:03 AM
    • Replies: 0
    • Views: 4,164
    11-26-2009, 09:03 AM Go to last post
  22. Factor Analysis vs. Principal Component Analysis

    I've asked this question on here a while back but didn't quite get an answer that helped me understand what is truly different about these two...

    Started by lancearmstrong1313‎, 01-02-2013 01:50 PM
    • Replies: 8
    • Views: 4,161
    01-09-2013, 07:31 PM Go to last post
  23. Using a 'Z score' in a correlation.

    Hi all, I'm conducting a bi-variate correlation, using pearsons. Can i use a z score as one variable with the other variable being dichotomous? ...

    Started by pg0410‎, 03-14-2013 02:49 PM
    • Replies: 9
    • Views: 4,157
    04-01-2013, 01:59 PM Go to last post
  24. Comparing ind. and dep. significance help!

    I'm working right now on a political science research paper and it's fairly involved in statistical analysis and I need some help and clarification....

    Started by burton160w‎, 12-06-2010 01:01 AM
    • Replies: 5
    • Views: 4,152
    12-08-2010, 12:24 AM Go to last post
  25. HLM vs. Fixed Factor vs. Dummy Variables -- What to choose?

    Hi all, I am trying to analyze data from a survey that I ran, which includes individual residents within 4 neighborhoods. I want to be able to...

    Started by moneypenny02‎, 12-07-2010 04:15 PM
    • Replies: 2
    • Views: 4,151
    12-08-2010, 11:57 AM Go to last post
  26. Fisher LDA

    Hi, How do I incorporate knowledge of prior class probabilities p_i into Fisher LDA? I think Fisher LDA assumes p_i = 1/c always, with c=# of...

    Started by omrit‎, 02-22-2011 08:54 AM
    • Replies: 2
    • Views: 4,151
    02-22-2011, 11:39 AM Go to last post
  27. Repeated measures analysis for Non-parametric data

    Hi everyone, I have a dataset that looks something like this: Patient.....Group.............Score_day1......Score_day2.....Score_day3...

    Started by anchms09‎, 01-26-2011 05:51 PM
    • Replies: 1
    • Views: 4,137
    06-01-2015, 05:18 AM Go to last post
  28. Finding SD given mean and n

    I am looking at data from State Assessment results and would like to compare means for schools. The problem is that the data that is given does not...

    Started by trinker‎, 04-04-2011 10:59 PM
    • Replies: 2
    • Views: 4,135
    04-04-2011, 11:53 PM Go to last post
  29. 2 Dice Rolls vs. 1 Target Number

    Hi guys, I hope you don't mind my posting this here. I'm a game designer who needs some help working out probabilities for a dice roll mechanic, and...

    Started by Mechalus‎, 01-05-2011 05:42 PM
    • Replies: 3
    • Views: 4,132
    01-06-2011, 11:09 AM Go to last post
  30. Steel dwass vs. wilcoxon each pair

    Hello Wilcoxon each pair vs. Steel dwass non parmaetric multiple comparison test in JMP. Which one is more powerful and why? I would really...

    Started by rzs0034‎, 11-06-2014 07:00 PM
    • Replies: 0
    • Views: 4,131
    11-06-2014, 07:00 PM Go to last post
  31. 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: 4,120
    07-11-2010, 11:30 PM Go to last post
  32. Determining Clustering in Time Series Data

    Dear all, Let me begin by apologising if my question is obvious or rudimentary, I have a very basic knowledge of statistics. I have some time...

    Started by Rss‎, 11-19-2010 07:50 AM
    • Replies: 2
    • Views: 4,108
    11-20-2010, 07:14 PM Go to last post
  33. Power Analysis for SURVEY data

    I am doing secondary data analysis on survey data that has a clustered, complex random design. I am using STATA 9.0. For the Power analysis do I use...

    Started by kawillit‎, 01-10-2009 07:31 PM
    • Replies: 0
    • Views: 4,105
    01-10-2009, 07:31 PM Go to last post
  34. when Bootstrap Correlation coefficient (Pearson) con be used?

    Hi! Though I know the mechanics of the bootstrap methods, I am do not manage to find in literature a clear-cut explanation about when and in what...

    Started by gianmarco‎, 10-26-2010 06:19 AM
    • Replies: 0
    • Views: 4,095
    10-26-2010, 06:19 AM Go to last post
  35. Choosing a test value for a one sample t-test

    Hi all, I am trying to determine how best to test a hypothesis I have formulated. I am examining a new user interface that allows the user to...

    Started by min.emerg‎, 09-11-2011 02:21 PM
    • Replies: 11
    • Views: 4,086
    09-13-2011, 01:28 PM Go to last post
  36. Generate Data for Correlated Continuous and Discrete variables

    Hi I was wondering if anybody could suggest an appropriate approach for the following... I have one independent variable, X, which takes the...

    Started by sammyj‎, 11-10-2011 07:15 AM
    correlation, multivariate, probit, simulated_data, simulation
    • Replies: 5
    • Views: 4,086
    11-11-2011, 02:29 PM Go to last post
  37. reporting statistical results

    I am wondering if this is the correct way of reporting significnat differences between correlations: "Conversely, males’ self-serving cognitive...

    Started by godfather‎, 02-06-2009 03:39 AM
    • Replies: 2
    • Views: 4,083
    02-09-2009, 10:12 AM Go to last post
  38. Lightbulb Accept Null hypothesis VS Reject Null hypothesis ?

    Hello Good evening everyone, I read about this for testing my hypothesis but still confusing me this accept/reject null hypothesis can...

    Started by hanialbarni‎, 12-02-2014 03:13 PM
    • Replies: 5
    • Views: 4,072
    12-03-2014, 05:38 AM Go to last post
  39. Consistency in statistical tests

    Hiya, this is quite a basic question. I'm testing whether administration of a drug causes an increase in 7 different dependent variables. So my...

    Started by hrj21‎, 06-13-2012 08:53 AM
    • Replies: 1
    • Views: 4,060
    06-22-2012, 02:47 PM Go to last post
  40. geometric argument for constraints on r_xz given r_xy and r_yz

    Today a labmate asked the following question: if we have three random variables x, y, z, and we know the correlations r_{xy} and r_{yz}, what...

    Started by Jake‎, 09-17-2013 01:17 AM
    • Replies: 5
    • Views: 4,058
    05-18-2015, 04:16 PM Go to last post
  41. Comparing Improvement Between Groups - Best Approach?

    Perhaps this is an easy issue, but I wanted to throw it out anyway. I'm working on a dataset where there are two groups, both having pre- and...

    Started by Barnzilla‎, 11-28-2008 09:58 AM
    • Replies: 3
    • Views: 4,057
    01-14-2009, 10:27 PM Go to last post
  42. ANOVA v t-test

    My understanding is that the t-test is a special case of a oneway ANOVA. I am confused by highly discrepant results when comparing the means of 2...

    Started by rob c‎, 05-10-2009 07:00 PM
    • Replies: 2
    • Views: 4,048
    05-10-2009, 09:12 PM Go to last post
  43. 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: 4,045
    08-02-2010, 12:53 PM Go to last post
  44. Chi square test for ordinal variables

    Hey all, I have a question regarding the chi-square statistics. I have a total sample size of more than 4,000 and I have 2 groups (2 different...

    Started by proefkonijn‎, 06-02-2012 01:39 PM
    • Replies: 3
    • Views: 4,044
    06-03-2012, 04:38 AM Go to last post
  45. 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: 4,041
    12-29-2011, 11:10 AM Go to last post
  46. Weighted EM algorithm?

    Hi, I have written an EM algorithm for mixtures of gaussian distributions. However, my problem is that I would now like to "weight" the EM so that...

    Started by tecne‎, 02-22-2008 09:23 PM
    • Replies: 1
    • Views: 4,040
    05-01-2008, 11:08 AM Go to last post
  47. Multiple Comparison Correction - Help needed !

    I know the concept that one should have statistical correction if multiple comparison are made between means. Such as the well-known bonferroni...

    Started by doctor‎, 11-02-2008 11:04 AM
    • Replies: 1
    • Views: 4,039
    08-20-2009, 09:42 AM Go to last post
  48. Appropriate Statistical Analysis

    Hello, I am getting ready to take comprehensive exams for my Master's Degree and have not had statistics in four years. I need some assistance in...

    Started by arkcomputers‎, 03-03-2009 01:47 PM
    • Replies: 4
    • Views: 4,032
    03-04-2009, 12:39 AM Go to last post
  49. Question about theta range in MA(1) processes

    Hello, According to forecasting textbooks (e.g. Diebold, Makridakis etc) the theta coefficient in an MA(1) model should be between -1 and 1...

    Started by zarasandreas‎, 09-08-2011 03:51 AM
    • Replies: 1
    • Views: 4,027
    09-08-2011, 08:45 AM Go to last post
  50. Research Design

    Hi there, i'm wondering if you guys could guide me a bit with my plans. Basically im intrested in looking at paranoid ideation (thr presence of...

    Started by blue2‎, 10-28-2010 04:48 PM
    • Replies: 9
    • Views: 4,010
    02-15-2011, 09:15 PM Go to last post
  51. Covariate Estimation & Unbiased Estimation

    I work with a group that utilizes the Mahalanobis Distance to detect the health of a system, mostly electronics. Within this research, we are looking...

    Started by 3waytie4last‎, 09-10-2008 12:41 PM
    • Replies: 0
    • Views: 4,004
    09-10-2008, 12:41 PM Go to last post
  52. sufficient statistic

    Hi guys, I have a little question. I got a density function: f(x)=exp{-(x-\theta)} when \theta<X<infinity I need to find a sufficient...

    Started by WeeG‎, 06-02-2010 11:51 AM
    • Replies: 1
    • Views: 4,004
    06-02-2010, 11:59 AM Go to last post
  53. Help with multivariate (MCA) analysis graph interpretation

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

    Started by Gags‎, 01-04-2012 07:18 PM
    • Replies: 1
    • Views: 3,999
    01-06-2012, 07:44 PM Go to last post
  54. Lightbulb Indirect Effect Report

    Hi All, Iím going to use the Soble macro (Preacher and Hayes, 2004, 2008) to test the indirect effect for my research variables. However, am...

    Started by ghada8888‎, 02-15-2012 05:29 PM
    • Replies: 4
    • Views: 3,994
    02-16-2012, 02:15 PM Go to last post
  55. Individual score to group mean comparison! Which test?

    Hello guys! I studied a lot of statistics during my psychology degree and masters in 2000-04 but I got very rusty since then! I tried to brush up...

    Started by gmart‎, 07-09-2014 04:17 PM
    • Replies: 2
    • Views: 3,988
    07-10-2014, 05:10 AM Go to last post
  56. 3x2 design - data analysis ANOVA/MANOVA? How to add interaction in the model?

    Hello, Discription of experiment I am researching "The effect of review valence and brand commitment on consumer's purchase intention" for my...

    Started by Stefan Stefanov‎, 04-19-2014 07:25 AM
    anova, interaction effect, manova, model fit, spss
    • Replies: 0
    • Views: 3,987
    04-19-2014, 07:25 AM Go to last post
  57. Post Meta-Analysis Procedure

    Hi all, I recently took upon the challenge of conducting a meta-analysis of studies in a particular domain and I am facing an obstacle on which...

    Started by yayo1984‎, 10-04-2010 05:01 PM
    • Replies: 0
    • Views: 3,984
    10-04-2010, 05:01 PM Go to last post
  58. what to do for unknown PDFs.

    Hi guys 1) When we are performing signal detection , and we have received this y(n)=x(n)+z(n) for n=0,1,2,3...., where z is gaussian noise, but...

    Started by sibtain125‎, 04-12-2011 10:59 PM
    • Replies: 0
    • Views: 3,984
    04-12-2011, 10:59 PM Go to last post
  59. As treated vs. per protocol?

    I have found articles saying the two are similar and cant make sense of it. Could anyone give me exact explanations of the two in lay terms and also...

    Started by Matt1147‎, 06-25-2013 03:21 PM
    • Replies: 2
    • Views: 3,975
    06-26-2013, 08:26 AM Go to last post
  60. New to time series stats (want spikes)

    Hi, I have been out of school for a while now (BS CompSci) and I only took one Statistics class many years ago. So I'm definitely not an expert. :o...

    Started by Phy6‎, 07-20-2010 05:39 PM
    • Replies: 1
    • Views: 3,968
    07-29-2013, 04:16 AM Go to last post

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