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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: 19,447
    10-11-2014, 12:02 PM Go to last post
  1. "Maximally uncorrelated" representation for a covariance matrix

    Hi, I have a question about the covariance matrix from a real-life study in particle physics. I am working on a non-linear fit of a...

    Started by pmn1‎, 12-20-2008 08:16 PM
    • Replies: 0
    • Views: 2,275
    12-20-2008, 08:16 PM Go to last post
  2. "significance metrics" for hypothesis testing

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

    Started by p05‎, 08-02-2010 04:58 PM
    • Replies: 0
    • Views: 2,798
    08-02-2010, 04:58 PM Go to last post
  3. "Uninformative" priors paradox?

    Bayesians, puzzle me this: If you are trying to learn the $p$ parameter of a binomial distribution, the least informative prior is the uniform...

    Started by serapio‎, 10-16-2010 10:15 PM
    • Replies: 1
    • Views: 4,100
    10-21-2010, 10:55 PM Go to last post
  4. Question 'Mean location/ spot'

    I have a design that need to have mean of different spots, in simple term it would be like this. P1 shoot 6 and P2 shoot 8 out of 16 neighboring...

    Started by funny4u22001‎, 07-25-2011 12:45 AM
    • Replies: 0
    • Views: 1,720
    07-25-2011, 12:45 AM Go to last post
  5. Question (adjusted)R-squared / eta-squared / omage-squared for ANOVA

    Dear all, When obtaining ANOVA results with SPSS we also get a R-squared and an adjusted R-squared. For a multi-way ANOVA the eta-squared is given...

    Started by Wilbert‎, 08-08-2013 05:41 AM
    anova r-squared
    • Replies: 2
    • Views: 7,830
    08-09-2013, 04:35 PM Go to last post
  6. (non-)parametric test dilemma

    I want to compare means of 6 variables and to do correlation analysis. I did Kolmogorov-Smirnov test and it showed that 3 of them are normally...

    Started by rmil‎, 06-17-2009 10:45 AM
    • Replies: 7
    • Views: 7,407
    06-22-2009, 07:50 PM Go to last post
  7. (Reasonable) way to simulate outliers?

    hi! so i've been wanting to tackle a project related to Spearman's rho through simulation and i think it would be reasonable to include an...

    Started by spunky‎, 08-08-2014 02:48 PM
    • Replies: 1
    • Views: 1,430
    08-08-2014, 02:55 PM Go to last post
  8. (URGENT!) Simulating expectations and a conditional expectation

    I need to simulate a conditional expectation of the form: E (Xi^2 /(||X||^2 +h) | R^2 = ||X-T||^2 + ||U||^2 , Zi^2= (Xi - Ti)^2) Where X~N(T,I_p),...

    Started by younes.ommane‎, 10-04-2017 08:38 AM
    conditional expectation, expectation, simulation, spherical statistics
    • Replies: 0
    • Views: 171
    10-04-2017, 08:38 AM Go to last post
  9. (Using R) Whats the right test to compare for significance?

    First of all, many thanks for looking at this post. My problem is partly technical knowledge (or lack of), but mainly one of perception! Ive been...

    Started by Hugster‎, 05-24-2013 05:47 AM
    significance test
    • Replies: 0
    • Views: 13,751
    05-24-2013, 05:47 AM Go to last post
  10. *stats analysis help of complaints*

    Hi, I have to see if there is a significant difference in number of complaints per person. The data is as follows: A – 22 B - 17 C - 14 D...

    Started by liborhurt‎, 06-05-2014 11:40 AM
    • Replies: 0
    • Views: 1,738
    06-05-2014, 11:40 AM Go to last post
  11. 1 group of subjects, two tests

    Hi all. I'm a bit confused at the moment, so I'm hoping anyone here can give me a hand :) I've completed a large data collection, using 9...

    Started by Student87‎, 01-29-2014 07:23 AM
    • Replies: 2
    • Views: 1,208
    01-29-2014, 09:06 AM Go to last post
  12. Question 1 observation for control group & 3 obs for experimental group

    Hello, My background in statistics is quite limited, so I'm searching for help in order to choose which test I should use for my research. I am...

    Started by Pernelle‎, 03-05-2014 09:32 AM
    anova observations
    • Replies: 6
    • Views: 1,751
    03-11-2014, 03:05 PM Go to last post
  13. Question 1 or 2-way ANOVA on mean values from groups - allowed?

    Dear all, I really need your help. We have just run a small experiment where we treated some animals with 2 compounds that are potential treatment...

    Started by drkoch‎, 02-04-2014 07:52 AM
    • Replies: 11
    • Views: 2,471
    02-26-2014, 09:29 AM Go to last post
  14. 1 way Anova vs Two Way Anova -HELP needed

    I suck at stats and am always confused >.< I have 24 animals. Let's say I have 3 groups of animals (A,B,C) and 8 in each group. Each group...

    Started by BryRai‎, 01-03-2017 04:22 PM
    • Replies: 2
    • Views: 3,320
    01-05-2017, 09:06 AM Go to last post
  15. 10 point scale and central limit theorem

    I want to do a comparative analysis between two means of groups. I want to hear opinions on two things. 1. I asked participants to rate me...

    Started by micdhack‎, 03-31-2012 08:43 AM
    • Replies: 6
    • Views: 2,778
    04-03-2012, 05:20 AM Go to last post
  16. 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

    I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) e/(1 +...

    Started by Ade Sol‎, 01-27-2012 11:33 AM
    derivatives
    • Replies: 1
    • Views: 2,756
    01-27-2012, 11:54 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: 1,465
    09-09-2012, 03:36 PM Go to last post
  18. 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: 4,430
    01-06-2011, 11:09 AM Go to last post
  19. Question 2 independent var, 1 dependent var. What test should I use? Help wanted please!

    I desperately need some help with my research please. I am researching the effect of instruction in primary school and secondary school. My aim is...

    Started by Dutchie‎, 05-10-2011 07:17 AM
    • Replies: 0
    • Views: 1,719
    05-10-2011, 07:17 AM Go to last post
  20. 2 or 3 way ANOVA?

    Hi I'm not sure whether to use a 2 or 3 way ANOVA. My project I'm working on is focussing on one antibiotic and seeing how toxic it is at...

    Started by alanie‎, 05-25-2015 09:33 AM
    anova
    • Replies: 1
    • Views: 1,207
    05-26-2015, 07:04 AM Go to last post
  21. 2 Sample T Test for Nonnormal data

    Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

    Started by goducks13‎, 04-05-2013 08:48 PM
    • Replies: 10
    • Views: 2,836
    04-09-2013, 07:13 PM Go to last post
  22. 2 x 4 Factorial Design and contrasts...

    Question... I have a 2 (gender) x 4 (Drug Dose) design Gender - Male - Female Dose - 200 - 400 - 600 - 800

    Started by flanger‎, 11-30-2008 06:40 PM
    • Replies: 2
    • Views: 13,047
    11-30-2008, 11:37 PM Go to last post
  23. Question 2x2 Repeated Measures ANOVA

    Dear all, I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an...

    Started by Pedro‎, 10-25-2012 05:46 PM
    anova, two way
    • Replies: 4
    • Views: 3,295
    10-26-2012, 09:02 AM Go to last post
  24. 3 Groups of Participants & Likert data

    Hi, I'm new to the forum - though I have browsed and found the resources helpful for a long time. Thank you to all who contribute here. I have...

    Started by Satele‎, 10-28-2013 07:45 AM
    analysis, data, likert, ordinal, scale
    • Replies: 7
    • Views: 2,030
    11-05-2013, 07:00 AM Go to last post
  25. 3 interdependent variables, parametric fit, loss for words

    I'm looking for a mathematical description of a data-set, but i have trouble finding the right wording. So i will just describe the situation. I...

    Started by Ivanana‎, 06-13-2012 05:29 PM
    • Replies: 0
    • Views: 2,462
    06-13-2012, 05:29 PM Go to last post
  26. 3 way ANOVA with repeated measures... Data entry setup for statistica

    Hello all; I am doing a preliminary analysis on some data using STATISTCA, however being new to the software I am having a real difficult time...

    Started by rms5413‎, 05-22-2014 10:28 PM
    • Replies: 1
    • Views: 1,550
    12-09-2014, 02:24 PM Go to last post
  27. 3-Way ANOVA Woes (Levene's Test)

    Hi all, I'm doing a study on the amount of a protein found in a brain region after different manipulations. Exercise is thought to increase it, a...

    Started by AndrewLoG‎, 03-18-2014 07:18 PM
    • Replies: 0
    • Views: 2,318
    03-18-2014, 07:18 PM Go to last post
  28. 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: 4,225
    04-19-2014, 07:25 AM Go to last post
  29. 3x3 factorial design, repeated outcome measure

    I have a 3x3 factorial design (3 levels of treatment and 3 different environments) - the outcome is a repeated measurement taken at every week - the...

    Started by oncearunner‎, 10-06-2014 05:29 PM
    • Replies: 1
    • Views: 2,857
    10-07-2014, 02:53 AM Go to last post
  30. 4 simultaneous non-independent measures should nested ANOVA work?

    Hi all, this is my first time posting here, but Im very stuck. I have to analyze data from an animal behavior experiment. I have 3 strains, with 20...

    Started by anvee‎, 08-14-2014 02:35 PM
    animal behavior, behavioral experiment, jmp, nested anova, preference
    • Replies: 0
    • Views: 2,782
    08-14-2014, 02:35 PM Go to last post
  31. 95% ci

    Hi I am trying to interpret a journal article about the results of whether drinking cokes leads to child hyperactivity, the sample taken from a...

    Started by h974483‎, 10-22-2011 05:37 AM
    • Replies: 2
    • Views: 2,557
    10-24-2011, 08:25 AM Go to last post
  32. ?is there a test for this?

    I have one nominal (disease, no disease) dependent variable and two independent variables I wish to look at regarding whether or not they are...

    Started by Justin Gundara‎, 03-24-2011 07:35 AM
    • Replies: 2
    • Views: 2,214
    03-28-2011, 08:45 PM Go to last post
  33. A basic question. Pls help...

    Hi, When discussing the large sample theory, the professor in my econometrics course said sth that I found hard to grasp. He said something...

    Started by promaccat‎, 06-07-2009 01:21 PM
    • Replies: 1
    • Views: 2,689
    06-15-2009, 08:07 PM Go to last post
  34. A bit rusty could someone give me a shove in the right Direction Please

    Hi guys , I'm a management PhD student. I did a module on SPSS 14 before having to take a year out. I'm now starting to write up a bit of my thesis...

    Started by arobbo‎, 08-25-2008 07:48 AM
    • Replies: 1
    • Views: 2,907
    08-25-2008, 11:05 AM Go to last post
  35. a completely randomized experimental design and regression

    A company studied the effects of three different methods of promotions on sales of its crackers (labeled as Treatment 1 to 3). Fifteen stores were...

    Started by eunkum‎, 06-02-2016 10:54 AM
    regression
    • Replies: 1
    • Views: 1,938
    06-02-2016, 02:38 PM Go to last post
  36. a data modeling question

    Just had a job interview with a bank. They asked me the following questions: 1. Their credit card offers reward points. They want to predict...

    Started by aha123‎, 03-05-2012 02:26 AM
    • Replies: 1
    • Views: 1,771
    03-05-2012, 04:26 AM Go to last post
  37. Unhappy A little guideance needed...

    First off, I hoped I've posted in the right forum-if not sorry xx I'm working through a sample question regarding a sample of 20 sections of...

    Started by Charlie Day‎, 07-29-2013 03:58 PM
    • Replies: 3
    • Views: 2,112
    07-30-2013, 07:15 AM Go to last post
  38. 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: 1,855
    12-23-2011, 12:27 PM Go to last post
  39. A nice easy one about Repeated Measures ANOVA

    Hello! A basic question from a not-very-statistically-savvy person: I have data from 2 groups of patients who underwent knee replacement...

    Started by okennedy‎, 10-06-2008 08:36 AM
    • Replies: 5
    • Views: 6,726
    10-07-2008, 01:00 PM Go to last post
  40. A Non parametric equivelent to mixed anova?

    Hello, I am trying to find a non-parametric equivalent to a mixed Anova? My data is horrible. Three small unequal groups (8, 8, 4) and data...

    Started by Elaine98‎, 08-14-2010 07:33 AM
    • Replies: 1
    • Views: 5,419
    08-14-2010, 09:36 AM Go to last post
  41. A power analysis question - am I making a big mistake?

    Help! It's a very long time since I have had to tackle Power Analysis but I have recently been handed a couple of problems, one of which I hope...

    Started by Graham‎, 01-01-2010 05:36 PM
    • Replies: 0
    • Views: 2,395
    01-01-2010, 05:36 PM Go to last post
  42. A question about General Linear Model and random factors

    Hi everyone. :wave: I have the following problem. In an experiment I had a number of plants of two developmental stages. I applied a treatment with...

    Started by Kassandra‎, 04-12-2013 03:37 PM
    • Replies: 0
    • Views: 1,942
    04-12-2013, 03:37 PM Go to last post
  43. A question about Multiple imputations

    If I use multiple imputations to complete missing values in a certain variable, can I later use the imputated variable in another imputation (to...

    Started by SD1‎, 09-08-2014 05:53 AM
    missing values, multiple imputations
    • Replies: 1
    • Views: 1,935
    09-08-2014, 08:02 AM Go to last post
  44. A question on adjusted f effect size formula

    The F adjusted formula as I am aware is: sqrt where a is the number of conditions (a=3 for my case), N the total sample size (N=30 for my case...

    Started by Aaron Ang‎, 09-22-2017 03:31 AM
    • Replies: 0
    • Views: 325
    09-22-2017, 03:31 AM Go to last post
  45. Lightbulb A question regarding correlation and regression for a seminar

    Hello, Im doing a seminar in which the dependent variable is work centrality which is an interval one. the independent variable is age (ratio),...

    Started by gidlin1‎, 12-25-2013 02:16 AM
    • Replies: 1
    • Views: 3,291
    12-25-2013, 04:01 AM Go to last post
  46. A question regarding Cronbach's Alpha

    Hi everyone. I have been reading that Cronbach's Alpha is used when you need to test consistency of several Likert questions which all try to...

    Started by graphicsgriffin‎, 09-18-2011 06:25 AM
    • Replies: 2
    • Views: 2,610
    01-24-2015, 03:18 PM Go to last post
  47. A Quick Question Concerning Repeated Measures of ANOVA.

    Hello Everyone! I am working on the capstone thesis project for my Master's degree and hoping for some professional assistance to determine if I...

    Started by cyanide‎, 10-18-2011 07:53 PM
    • Replies: 1
    • Views: 2,383
    10-19-2011, 12:58 PM Go to last post
  48. A simple case that doesn't seem that simple

    I've been trying to find the best solution for my experiment. I don't like that much what my colleagues are using for the statistic test here. So I...

    Started by srd‎, 11-25-2013 06:43 AM
    • Replies: 5
    • Views: 2,292
    12-02-2013, 10:34 AM Go to last post
  49. 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: 2,535
    10-10-2008, 04:50 AM Go to last post
  50. 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: 4,014
    09-02-2015, 03:42 AM Go to last post
  51. abnormal data, log transform data, still abnormal, what to do?

    Hello all, I have a dataset where I want to run repeated measures and I have abnormal data. So I log transformed the data set and it is still...

    Started by cherries‎, 12-07-2012 11:56 AM
    • Replies: 6
    • Views: 2,744
    06-20-2013, 02:19 PM Go to last post
  52. Exclamation abnormal returns calculation for over 500 companies(M&A deals)

    Hello everyone, I am working on a research project based on abnormal returns in M&A deals. I am looking at last 5 years deals in which both the...

    Started by roamer‎, 08-28-2013 11:21 AM
    • Replies: 0
    • Views: 1,108
    08-28-2013, 11:21 AM Go to last post
  53. about random walk Metropolis algorithm

    Our model is: Y is distributed from a Negative binomial(r,p) where log(p/1-p)=xb. The prior of b is a multivariate normal(mu0,...

    Started by zzeta35‎, 01-06-2013 04:45 PM
    r code, rwm
    • Replies: 3
    • Views: 2,340
    01-06-2013, 07:50 PM Go to last post
  54. About Sampling

    My manager wants me to do a research about advance purchase day vs. fare. however it involves too many categories, and we have billions of tickets...

    Started by humanmaycry‎, 11-19-2009 12:05 AM
    • Replies: 0
    • Views: 2,338
    11-19-2009, 12:05 AM Go to last post
  55. About the distribution of confidence interval for Weibull

    Does anyone have an idea about the distribution of the 95&#37; confidence intervals for a population with a Weibull distribution? Thanks in advance!

    Started by ppmovie‎, 03-23-2009 06:18 PM
    • Replies: 0
    • Views: 3,653
    03-23-2009, 06:18 PM Go to last post
  56. Absolute or relative changes?

    I would like to compare the changes in salt excretion caused by a saline infusion in a group of patients studied under high sodium and low sodium...

    Started by Carolina‎, 06-16-2009 04:57 AM
    • Replies: 0
    • Views: 3,144
    06-16-2009, 04:57 AM Go to last post
  57. Accelerated Bootstrap - mediation

    Howdy! :tup: Can anyone explain accelerated bootstrap to me? I've got it reported in a research report and I can't really figure it out. ...

    Started by danony‎, 08-20-2011 05:01 AM
    • Replies: 2
    • Views: 5,287
    08-20-2011, 04:15 PM Go to last post
  58. 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: 4,357
    12-03-2014, 05:38 AM Go to last post
  59. Question accounting for volunteers giving a survey

    When writing about validity/ reliability, how do I take into account volunteers who have given the treatment to the participants rather than myself...

    Started by watasnake‎, 05-29-2013 07:36 PM
    reliability, validity, volunteers
    • Replies: 0
    • Views: 1,050
    05-29-2013, 07:36 PM Go to last post
  60. Adding random error to ordinal IV to make it more continous

    In survey data, attududinal questions are often coded 1-5, 1-7, 0-10 etc. These kinds of variables are often reffered to as approximately...

    Started by Ullsokk‎, 10-07-2011 03:30 AM
    • Replies: 2
    • Views: 2,806
    10-07-2011, 09:37 AM Go to last post

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