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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: 18,793
    10-11-2014, 12:02 PM Go to last post
  1. Using chi-squared test for goodness of fit for different sizes of sample?

    Firstly, apologies if I'm posting this in completely the wrong place. I'm trying to figure out a way to allow for different sized samples when...

    Started by HelenW‎, 10-28-2011 02:26 PM
    chi-square, chi-squared
    • Replies: 1
    • Views: 3,858
    10-28-2011, 03:34 PM Go to last post
  2. Need help in how to structure my data in SPSS

    Hi there, I am confused on how to input my data in SPSS. I have 2 questionaires for my research. Questionnaire 1 have 3 questions for...

    Started by Cephas Thio Mairimashou‎, 10-27-2011 12:40 AM
    • Replies: 1
    • Views: 2,110
    10-28-2011, 03:11 AM Go to last post
  3. Help Me ........

    I am looking for a topic for my Mphil research. I am fed up with searching for a topic. i am interested in computational statistics, multivariate...

    Started by hpanoo‎, 10-26-2011 09:26 AM
    • Replies: 6
    • Views: 2,018
    10-27-2011, 03:57 PM Go to last post
  4. Need guidance in determining how to analyze my data

    Hi all, I've collected all of my data (n = 350) for my Master's thesis and I'm having trouble analyzing it using SPSS. Compounding my troubles is...

    Started by canadianjameson‎, 10-25-2011 02:31 PM
    • Replies: 1
    • Views: 3,182
    10-25-2011, 03:44 PM Go to last post
  5. Two rater agreement

    Hi, Im having a problem that has been puzzling me for a while. Im looking for a method to analize the level of agreement between two independent...

    Started by joplin‎, 10-24-2011 02:35 PM
    • Replies: 0
    • Views: 1,553
    10-24-2011, 02:35 PM Go to last post
  6. 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: 2,443
    10-24-2011, 08:25 AM Go to last post
  7. How to report t-test results

    Hi, Im having trouble writting the result of a null hypothesis. so far this was the template i was using when reporting the result of a...

    Started by Alexia Dayan‎, 10-20-2011 11:03 PM
    • Replies: 1
    • Views: 12,678
    10-20-2011, 11:45 PM Go to last post
  8. Wink Logistic regression question

    Hi, I have a large data set (over 1 million cases) and I put in approximately 5 to 10 IV that are all categorical. I am not getting a...

    Started by edgemont1‎, 10-19-2011 03:27 PM
    • Replies: 11
    • Views: 5,554
    10-20-2011, 11:11 AM Go to last post
  9. normalization for detection of outliers

    Hello everyone, I am working with a huge dataset and I'm trying to find outliers in each row for two subgroups of my dataset (G1 and G2)....

    Started by bontus‎, 10-20-2011 08:59 AM
    • Replies: 0
    • Views: 3,964
    10-20-2011, 08:59 AM Go to last post
  10. Quick question about reporting statistical results

    Hey there, just wondering about proper reporting of results of my 2x2 ANOVA experiment: -I compared lots of morphometric measurements of sea...

    Started by aesopclimber‎, 10-15-2011 01:51 PM
    • Replies: 5
    • Views: 2,970
    10-19-2011, 01:01 PM Go to last post
  11. 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: 2,272
    10-19-2011, 12:58 PM Go to last post
  12. Friedman test...

    I really hope someone can help as I am a bit lost and my knowdledge in statistics is very basic. I have done an experiment in which I have...

    Started by ARI‎, 10-18-2011 10:12 AM
    • Replies: 0
    • Views: 1,547
    10-18-2011, 10:12 AM Go to last post
  13. Multiple comparisons

    Hello, I recently read an article where the authors claimed to use "Scheffe's test with Bonferonni correction." My understanding was that Scheffe's...

    Started by jmill40000‎, 10-18-2011 09:08 AM
    • Replies: 0
    • Views: 1,841
    10-18-2011, 09:08 AM Go to last post
  14. Cluster analysis vs multicolinearity

    Hi you all, I hope you can help me with this following problem: 1. I've runned an factor analysis on my data for fifteen "need" items for sugar...

    Started by Tom Meulders‎, 10-17-2011 06:40 AM
    cluster analysis, data reduction, mahalanobis, multicollinearity
    • Replies: 0
    • Views: 3,449
    10-17-2011, 06:40 AM Go to last post
  15. Mean centering (good bad or ugly?)

    As part of a regression course I have to do mean centering. I looked it up and have read 4-5 articles on it. Generally opinions are skewed in the...

    Started by trinker‎, 10-15-2011 06:48 PM
    • Replies: 8
    • Views: 16,001
    10-16-2011, 12:45 PM Go to last post
  16. Normal Distribution

    Here's a question of normal distribution. I cant figure out how to solve it. The weekly wages of 2000 workers in a factory is normally distributed...

    Started by vegeta‎, 10-16-2011 12:09 AM
    • Replies: 1
    • Views: 2,619
    10-16-2011, 12:40 AM Go to last post
  17. panel data regressions

    Hi, I used matlab to run unbalanced panel data analysis (attached) . I am finding difficulties finding out whether my model is valid with the huge...

    Started by 12345678‎, 10-15-2011 07:30 PM
    • Replies: 0
    • Views: 3,611
    10-15-2011, 07:30 PM Go to last post
  18. Cramer's V effect size based on df

    I saw a presentation about chi-square testing and correlations. Specifically calculating effect size for Cramer's V results. The puzzling thing was...

    Started by micdhack‎, 10-11-2011 05:52 AM
    • Replies: 10
    • Views: 26,865
    10-15-2011, 12:41 PM Go to last post
  19. 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: 3,113
    10-15-2011, 12:00 PM Go to last post
  20. Test statistic concerning mean comparison of UNKOWN sample distributions?

    Hello, all. I'm far from a statistics expert, so excuse me for any inaccuracy that I might say. I'm trying to compare two sample distributions...

    Started by moudatsos‎, 09-29-2008 08:31 AM
    • Replies: 3
    • Views: 6,083
    10-14-2011, 09:03 AM Go to last post
  21. Cronbach's alpha

    Help please! What data do I need to work out the cronbach alpha coefficient? I have 30 responses to a large number of Likert-type questions. We want...

    Started by ljsimkcd‎, 10-12-2011 08:10 AM
    • Replies: 5
    • Views: 3,685
    10-14-2011, 05:01 AM Go to last post
  22. Relationship between time spans

    1. purpose of the study/technique- I want to examine time stamped transcripts for 2 or more behaviors to see if they correlate. When variable 1...

    Started by trinker‎, 10-13-2011 06:41 PM
    • Replies: 1
    • Views: 2,616
    10-13-2011, 06:49 PM Go to last post
  23. mediate?? what does this word mean in terms of statistics?

    I know mediate in normal terms refers to intervening to to being agreement or reconciliation but in terms of statistics is it different? For example...

    Started by mimestra‎, 10-05-2011 08:30 PM
    • Replies: 4
    • Views: 12,700
    10-13-2011, 05:05 PM Go to last post
  24. Do I need separate margins of error?

    I have a question regarding margins of error. I'm looking for correlations between political knowledge and favorability of presidential candidates...

    Started by Husker‎, 10-13-2011 11:01 AM
    • Replies: 0
    • Views: 1,637
    10-13-2011, 11:01 AM Go to last post
  25. lessons of SPC and quality control

    hi, please could you share spc lessons :wave:

    Started by sihem‎, 10-12-2011 02:24 PM
    • Replies: 2
    • Views: 1,987
    10-13-2011, 10:24 AM Go to last post
  26. testing rates through time

    Hello all, this seems like it should be a simple questions but our team cannot find an answer to the question. If I have data set up like the...

    Started by shanehall.m‎, 10-11-2011 09:31 AM
    2 Pages
    1 2
    proportion, rates, time series, trend
    • Replies: 18
    • Views: 6,275
    10-13-2011, 09:04 AM Go to last post
  27. Exclamation Probability Mass Functions

    I am having some trouble on understanding some problems on my practice exam. The prompt is: Let X1 and X2 have (the same) probability mass...

    Started by creative22‎, 10-12-2011 05:50 PM
    mass function, probability, random variable
    • Replies: 1
    • Views: 3,911
    10-12-2011, 10:53 PM Go to last post
  28. Factorial ANOVA

    I am reading a paper looking at the effect of interventions (an aerobic exercise regime group, a stretching exercise regime group, plus a contol...

    Started by static‎, 10-10-2011 10:46 PM
    • Replies: 3
    • Views: 6,082
    10-12-2011, 02:49 AM Go to last post
  29. Minimum sample size for calculation of guttamns lower bounds?

    Hi there, I am in the process of assessing the internal consistency of two tests, test A & B. Both tests are measuring the same thing so I am...

    Started by BOAZ‎, 10-11-2011 06:31 AM
    conbach's alpha, guttman's lower bounds, internal consistency, reliability, split half
    • Replies: 3
    • Views: 4,644
    10-11-2011, 07:37 PM Go to last post
  30. Fleiss Kappa - an interesting blog and a question for your help

    Hi there, I am new to this forum. Hope you had a great Thanksgiving (if you are from Canada)! In my research, I have asked three evaluators to...

    Started by lucky_book‎, 10-11-2011 03:24 PM
    • Replies: 0
    • Views: 2,591
    10-11-2011, 03:24 PM Go to last post
  31. Post Margin of error and the median

    Hi there, Was just wondering if someone could help me determine whether The general sampling error of a survey (margin of error) can be applied...

    Started by shokkk‎, 10-05-2011 07:34 PM
    • Replies: 4
    • Views: 7,554
    10-10-2011, 05:24 PM Go to last post
  32. Pre post test

    When conducting an experiement with two groups both of who will have a baseline measurement and a post tset measurement and you wnat to measure both...

    Started by sarah321‎, 10-10-2011 04:58 AM
    • Replies: 0
    • Views: 1,911
    10-10-2011, 04:58 AM Go to last post
  33. Correct terminology? Expected FPR vs Observed FPR

    Hi. My first post here, great forum! I have a "terminology problem". I'm devising a statistical test, and it works fine but has a flaw; it is...

    Started by Hoogard‎, 10-10-2011 03:09 AM
    • Replies: 0
    • Views: 2,112
    10-10-2011, 03:09 AM Go to last post
  34. 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: 4,218
    10-09-2011, 07:58 AM Go to last post
  35. How many people are needed for a valid sample?

    Question I have to answer: In order to collect a survey of opinions, I would like to take a sample of a city with a population of 600,000 people....

    Started by frieswiththat‎, 10-07-2011 06:07 PM
    • Replies: 0
    • Views: 2,745
    10-07-2011, 06:07 PM Go to last post
  36. Do you know how you can solve this

    I want to plot a graph of the mean of two groups in the experiment. They have different mean, different standard deviation. The interval bars that...

    Started by h974483‎, 10-07-2011 05:22 PM
    • Replies: 0
    • Views: 1,810
    10-07-2011, 05:22 PM Go to last post
  37. Subsampling to obtain a p-value

    Hello everybody! This is my first post in this forum, I hope you guys have some ideas for me :) I have ~2000 measurements, namely angles, which...

    Started by luciferin‎, 09-22-2011 09:33 AM
    • Replies: 5
    • Views: 3,826
    10-07-2011, 12:57 PM Go to last post
  38. Classification

    Perhaps you can help me with a problem? I have a file which after a simple model classification which gives very lumpy results. ...

    Started by sverre.ardo@gmail.com‎, 09-29-2011 03:35 AM
    • Replies: 2
    • Views: 2,108
    10-07-2011, 10:43 AM Go to last post
  39. Interpreting moderation output

    Hi everyone, I am hoping for some help understanding output of an moderation analysis. In my experiment I have:- - 1 IV - 3 level...

    Started by Tilly01‎, 10-06-2011 06:30 AM
    • Replies: 1
    • Views: 5,393
    10-07-2011, 10:25 AM Go to last post
  40. 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: 2,713
    10-07-2011, 09:37 AM Go to last post
  41. ploting a graph in excel

    Hi I am reading an article about plotting graphs on excel: core.ecu.edu/psyc/wuenschk/stathelp/Excel-ErrorBars.doc In the document it says: ...

    Started by h974483‎, 10-07-2011 06:21 AM
    • Replies: 1
    • Views: 1,805
    10-07-2011, 09:09 AM Go to last post
  42. unusual contrast in 2x2 mixed ANOVA

    A friend of mine sent me the following question this morning. I gave the best advice that I had, but I was curious to hear alternative feedback from...

    Started by Jake‎, 10-06-2011 10:30 PM
    • Replies: 0
    • Views: 2,590
    10-06-2011, 10:30 PM Go to last post
  43. HI what does the alpha sign mean?

    it says, such and such variable (6 items, "alpha sign" = .88) is a measure of .......

    Started by h974483‎, 10-06-2011 01:48 AM
    • Replies: 0
    • Views: 1,960
    10-06-2011, 01:48 AM Go to last post
  44. How to Analyze this data?

    OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

    Started by DFoley‎, 10-03-2011 06:02 PM
    • Replies: 7
    • Views: 3,170
    10-05-2011, 11:38 AM Go to last post
  45. Interpreting Likert Scale

    Hi everyone, this is my first post and I'd really appreciate any help: I am completing an ethics application for my research and have been asked to...

    Started by sezbean‎, 10-05-2011 04:49 AM
    • Replies: 1
    • Views: 3,248
    10-05-2011, 11:02 AM Go to last post
  46. MANOVA post hoc or simple main effect

    does anybody know, when conducting a 3 x 3 MANOVA, if the interaction effect and both main effects are significant, is there any...

    Started by Benson‎, 10-04-2011 09:10 AM
    • Replies: 0
    • Views: 2,631
    10-04-2011, 09:10 AM Go to last post
  47. 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: 3,062
    10-03-2011, 04:39 PM Go to last post
  48. Paired t-test?

    Hello, I have been working with higher level statistics for so long that I have started to forget rudimentary techniques... I have a sample of...

    Started by waeggles‎, 10-03-2011 01:12 PM
    • Replies: 5
    • Views: 3,256
    10-03-2011, 04:32 PM Go to last post
  49. Yule Walker - AR(1) - Covariance Forumla

    Hello, I have the AR(1) process: Yt=phi*Yt-1 + et According to text books we ,ultiply by Yt-k, so we have: Yt*Yt-k=phi*Yt-1*Yt-k+et*Yt-k and...

    Started by zarasandreas‎, 10-01-2011 06:23 AM
    • Replies: 1
    • Views: 4,291
    10-01-2011, 11:22 AM Go to last post
  50. Tolerance intervals for binomial

    I'm trying to learn more about tolerance intervals for a binomial distribution, but am struggling to find much literature about them. Does anyone...

    Started by duskstar‎, 09-30-2011 04:10 AM
    • Replies: 0
    • Views: 2,942
    09-30-2011, 04:10 AM Go to last post
  51. Cronbach's alpha with weighted data

    Hi I have a test whose reliability I want to calculate, using Cronbach's alpha. The first 18 questions are scored 0 or 1 (right or wrong). The...

    Started by jimbowylie‎, 09-29-2011 06:03 AM
    cronbach's alpha, research, weighted data
    • Replies: 0
    • Views: 2,920
    09-29-2011, 06:03 AM Go to last post
  52. Mean change over time attriubted to another variable

    The following is the research question that was posed to me: How much of impact on the increase in satisfaction over last year can be attributed...

    Started by t_star‎, 09-26-2011 09:24 AM
    • Replies: 8
    • Views: 5,086
    09-28-2011, 04:34 PM Go to last post
  53. Which data types & correlation method?

    Dear all, I'm a new graduate student and not yet proficient at statistics in research. Please help me confirm/correct the following questions. ...

    Started by nini‎, 09-27-2011 10:13 PM
    correlation method, data type, significance test
    • Replies: 3
    • Views: 12,177
    09-28-2011, 11:17 AM Go to last post
  54. eviews question

    Hello everybody, I need fto find evieuws somewhere on the web but i can't find it. Doesn anyone know where i can download for no charge? Thx for...

    Started by freddysurgery‎, 12-28-2010 01:20 PM
    • Replies: 3
    • Views: 5,635
    09-28-2011, 06:34 AM Go to last post
  55. Estimating overall output of multiple independent inputs - engineering project

    Hi all I am conducting a final-year university engineering research project. The aim is to build a model (in the form of single implicit...

    Started by gidon‎, 09-27-2011 07:25 AM
    • Replies: 0
    • Views: 1,366
    09-27-2011, 07:25 AM Go to last post
  56. Please help - I would appreciate any advice! (^_^)

    Hi Everyone, I'm doing a project that is evaluating the timeliness of emergency appendicectomies in a hospital. The literature states that delays...

    Started by satsuki‎, 09-27-2011 02:50 AM
    project, statistics help, tests
    • Replies: 0
    • Views: 1,953
    09-27-2011, 02:50 AM Go to last post
  57. Comparing two groups on multiple DVs

    Hi all! I'm hoping for some help with reviewer comments on a paper. I'm a grad student in behavioural neuroscience, with some stats courses under...

    Started by Amisa‎, 09-25-2011 01:08 AM
    alternative to bonferroni, multiple comparisons, t-tests
    • Replies: 4
    • Views: 2,513
    09-25-2011, 05:08 PM Go to last post
  58. best way to create ANOVA groups from a range of scores?

    Hello Everyone, I have been involved in a discussion with my Experimental Methods of Psychology Instructor about the best way to divide a range of...

    Started by Patrick Turbiville‎, 09-23-2011 03:21 PM
    • Replies: 5
    • Views: 2,963
    09-24-2011, 04:46 AM Go to last post
  59. Bayesian: Defining priors from *same* data set you're modeling

    I believe that it is inappropriate to define prior distributions based on the same data you will be analyzing with those priors. In other words, the...

    Started by BayesianGirl‎, 09-22-2011 02:12 PM
    bayes, bayesian, bayesian inference, prior
    • Replies: 1
    • Views: 2,538
    09-22-2011, 07:47 PM Go to last post
  60. homogenity of variance

    I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

    Started by fromsydney‎, 09-21-2011 09:08 PM
    • Replies: 3
    • Views: 4,310
    09-22-2011, 02:58 PM Go to last post

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