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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: 18,730
    10-11-2014, 12:02 PM Go to last post
  1. Post regression time series

    Dear Members, I need to do time series analysis. I have retail sales data of a retail company since January 2006(every month). I need to forecast...

    Started by masarimk‎, 09-09-2011 02:21 AM
    forecasting, regression analysis, time series
    • Replies: 2
    • Views: 2,178
    09-12-2011, 10:00 PM Go to last post
  2. Variance, means and clusters

    I have a question for you, hopefully it's not too trivial, but I a'm not an expert :) I have the distribution, within a certain population, of a...

    Started by Radioking‎, 09-13-2011 10:44 AM
    clustering, regression analysis, variance
    • Replies: 0
    • Views: 1,827
    09-13-2011, 10:44 AM Go to last post
  3. Age Adjusted Rates

    So I'm trying to make my data match, in some ways, those used by the CDC (NCHS, specifically). In particular, I need to calculate age-adjusted...

    Started by bryangoodrich‎, 09-13-2011 12:28 PM
    • Replies: 0
    • Views: 1,998
    09-13-2011, 12:28 PM Go to last post
  4. 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: 4,082
    09-13-2011, 01:28 PM Go to last post
  5. multiple levels of indepenent variable

    I have three x variables (a,b,c) and b is nested in a and c is nested in b. As you can imagine, there are over 100 levels of c and about 25 levels...

    Started by shanehall.m‎, 09-12-2011 02:34 PM
    • Replies: 2
    • Views: 2,107
    09-14-2011, 02:56 PM Go to last post
  6. Bayesian Variable Transformation (solve for PDF)

    Hi I'm struggling with where to start for this variable transformation problem. X~Bin(N,p) so that p(X=x) = (N choose x) * (p^x) * (1-p)^(N-x) ...

    Started by Dwaffle‎, 09-13-2011 08:59 PM
    • Replies: 2
    • Views: 2,188
    09-14-2011, 06:11 PM Go to last post
  7. paired or unpaired T-Test or even some other test?

    Hello there, I am trying to help out some students of medicine who are writing at their phd-thesis in germany. they have data from several...

    Started by Kullukschan‎, 09-14-2011 11:50 AM
    • Replies: 7
    • Views: 3,633
    09-14-2011, 07:18 PM Go to last post
  8. How to calculate credibility interval limits

    Hi everyone. My name is Choi. I'm working on detecting drug adverse reaction signals using health insurance data. I have a problem in getting...

    Started by aamssa‎, 09-14-2011 02:52 AM
    • Replies: 2
    • Views: 5,420
    09-14-2011, 09:32 PM Go to last post
  9. Best test to use?

    Hi Everyone, I am trying to design a medical study and having difficult for teh best to use, in summary: Stage 1: Patients are classified into...

    Started by amanco‎, 09-15-2011 06:02 PM
    • Replies: 0
    • Views: 1,635
    09-15-2011, 06:02 PM Go to last post
  10. Sample, population on Facebook

    Hello everyone, i need help verifying if my method is correct or if you can find any problems with it, and if you can i would like you to propose...

    Started by micdhack‎, 09-15-2011 05:34 AM
    • Replies: 9
    • Views: 2,950
    09-16-2011, 05:36 AM Go to last post
  11. Comparing two distributions using random drawing.

    Hi all, So this is going to be a bit of a silly question: but one i've been pondering for ages. So say i've used a t-test and found two groups...

    Started by ThomasAG‎, 03-07-2010 03:59 PM
    • Replies: 7
    • Views: 3,930
    09-18-2011, 08:11 AM Go to last post
  12. 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: 3,079
    09-19-2011, 08:12 PM Go to last post
  13. What is study population in Statistics?

    this is a question that i have to answer * you have been requested to design a study to determine the prevelence of hypertention in my area. 1....

    Started by sam197902‎, 09-20-2011 04:35 AM
    cross sectional, study population
    • Replies: 1
    • Views: 9,820
    09-20-2011, 08:50 AM Go to last post
  14. Need for Bonferroni correction

    Hi All, I'm hoping you can help me figuring out whether doing ANOVA or MANOVA save on power. My understanding is that ANOVA will tell you if...

    Started by pbakker‎, 09-21-2011 02:00 PM
    • Replies: 4
    • Views: 4,506
    09-21-2011, 04:19 PM Go to last post
  15. Question about Consensus Analysis

    Is anyone familiar with consensus analysis, as described by Romney, Borgatti, Weller, etc.? The way I understand it, one does a factor analysis of...

    Started by jsibley‎, 09-21-2011 01:45 PM
    • Replies: 1
    • Views: 1,985
    09-22-2011, 04:50 AM Go to last post
  16. 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: 4,296
    09-22-2011, 02:58 PM Go to last post
  17. 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: 2,518
    09-22-2011, 07:47 PM Go to last post
  18. 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: 2,955
    09-24-2011, 04:46 AM Go to last post
  19. 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: 2,501
    09-25-2011, 05:08 PM Go to last post
  20. 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: 1,948
    09-27-2011, 02:50 AM Go to last post
  21. 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: 1,351
    09-27-2011, 07:25 AM Go to last post
  22. 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: 5,596
    09-28-2011, 06:34 AM Go to last post
  23. 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: 12,133
    09-28-2011, 11:17 AM Go to last post
  24. 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: 5,058
    09-28-2011, 04:34 PM Go to last post
  25. 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: 2,904
    09-29-2011, 06:03 AM Go to last post
  26. 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: 2,928
    09-30-2011, 04:10 AM Go to last post
  27. 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: 4,267
    10-01-2011, 11:22 AM Go to last post
  28. 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: 3,240
    10-03-2011, 04:32 PM Go to last post
  29. 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: 3,054
    10-03-2011, 04:39 PM Go to last post
  30. 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: 2,625
    10-04-2011, 09:10 AM Go to last post
  31. 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: 3,245
    10-05-2011, 11:02 AM Go to last post
  32. 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: 3,157
    10-05-2011, 11:38 AM Go to last post
  33. 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: 1,951
    10-06-2011, 01:48 AM Go to last post
  34. 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: 2,572
    10-06-2011, 10:30 PM Go to last post
  35. 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: 1,796
    10-07-2011, 09:09 AM Go to last post
  36. 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: 2,702
    10-07-2011, 09:37 AM Go to last post
  37. 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: 5,378
    10-07-2011, 10:25 AM 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: 2,097
    10-07-2011, 10:43 AM Go to last post
  39. 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: 3,795
    10-07-2011, 12:57 PM Go to last post
  40. 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: 1,793
    10-07-2011, 05:22 PM Go to last post
  41. 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: 2,728
    10-07-2011, 06:07 PM Go to last post
  42. 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: 4,182
    10-09-2011, 07:58 AM Go to last post
  43. 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: 2,099
    10-10-2011, 03:09 AM Go to last post
  44. 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: 1,899
    10-10-2011, 04:58 AM Go to last post
  45. 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: 7,526
    10-10-2011, 05:24 PM Go to last post
  46. 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: 2,583
    10-11-2011, 03:24 PM Go to last post
  47. 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: 4,628
    10-11-2011, 07:37 PM Go to last post
  48. 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: 6,064
    10-12-2011, 02:49 AM Go to last post
  49. 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: 3,891
    10-12-2011, 10:53 PM Go to last post
  50. 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: 6,251
    10-13-2011, 09:04 AM Go to last post
  51. 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: 1,979
    10-13-2011, 10:24 AM Go to last post
  52. 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: 1,627
    10-13-2011, 11:01 AM Go to last post
  53. 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: 12,647
    10-13-2011, 05:05 PM Go to last post
  54. 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: 2,596
    10-13-2011, 06:49 PM Go to last post
  55. 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: 3,660
    10-14-2011, 05:01 AM Go to last post
  56. 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: 6,055
    10-14-2011, 09:03 AM Go to last post
  57. 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: 3,099
    10-15-2011, 12:00 PM Go to last post
  58. 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: 26,775
    10-15-2011, 12:41 PM Go to last post
  59. 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: 3,595
    10-15-2011, 07:30 PM Go to last post
  60. 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: 2,608
    10-16-2011, 12:40 AM Go to last post

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