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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: 18,657
    10-11-2014, 12:02 PM Go to last post
  1. Maximum number of groups in Kruskal Wallis one-way analysis of variance

    Is there a maximum number of groups in Kruskal Wallis' one-way ANOVA? I am looking at a data set with 42 separate groups and I am unsure if there...

    Started by feignfeign‎, 01-09-2017 11:02 PM
    • Replies: 5
    • Views: 2,837
    01-12-2017, 07:14 PM Go to last post
  2. Regression Analysis

    I'm trying to better understand linear regression by the following questions. (1) Linear regression assumes: a. The relationship between X...

    Started by msoe414‎, 04-07-2017 04:49 AM
    statistics help
    • Replies: 5
    • Views: 1,490
    04-07-2017, 10:35 PM Go to last post
  3. attrition: comparing *surviving* sample to original

    Hi, I have a question about attrition analyses in longitudinal databases. I know that I can compare the subjects who dropped out...

    Started by foreverpostdoc‎, 11-15-2006 11:45 AM
    • Replies: 4
    • Views: 2,989
    11-19-2006, 03:33 PM Go to last post
  4. Regression Method

    I need to create a software algorithm to calculate cubic or quartic regression on an array of values, but it's been a while since my last stats...

    Started by djshusko‎, 06-13-2007 09:20 AM
    • Replies: 4
    • Views: 3,326
    06-15-2007, 01:34 PM Go to last post
  5. Question Question About K-Means

    I'm currently working on a project that looks at clustering retail stores on the bases of their Sales performance by item class. Items that are sold...

    Started by Kam36‎, 06-03-2008 05:11 PM
    • Replies: 4
    • Views: 3,242
    06-03-2008, 07:20 PM Go to last post
  6. Measuring Neural Network Performance

    Hi all, I have a set of matrix where the last column is the RESPONSE VECTOR. I have performed a backprop NN (neural network) in order to...

    Started by akmaltk96‎, 07-07-2008 09:11 PM
    • Replies: 4
    • Views: 5,226
    12-21-2009, 04:14 PM Go to last post
  7. High Correlations with Very Different Distributions..?

    I am comparing a similar calculation for the same sample via two different methods. My goal is to show that the second measure offers more rich /...

    Started by american_rob‎, 07-08-2008 02:46 PM
    • Replies: 4
    • Views: 3,583
    07-14-2008, 09:59 PM Go to last post
  8. negligible trend tests?

    Greetings, I'm looking for information on how to test for a "negligible" trend. Info such as links to websites, formula/equations, and other...

    Started by Burgs‎, 08-02-2008 04:18 PM
    • Replies: 4
    • Views: 2,857
    08-04-2008, 10:43 AM Go to last post
  9. Hypothesis testing

    conduct a hypotheses text for each sample at the .01 level of significance and what action should be taken provide the test statistic and p-value for...

    Started by rock9449‎, 08-02-2008 08:49 PM
    • Replies: 4
    • Views: 5,377
    08-03-2008, 06:52 PM Go to last post
  10. Conjoint analysis

    ....i need some insight please... those familiar with conjoint, though i don't have any statistical package to run on it, so my plan was to do...

    Started by edhunter‎, 08-11-2008 12:00 PM
    • Replies: 4
    • Views: 5,883
    03-16-2009, 05:52 AM Go to last post
  11. From OLS to Box Cox to ?

    Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

    Started by andony‎, 08-29-2008 01:25 PM
    • Replies: 4
    • Views: 5,950
    08-31-2008, 02:58 PM Go to last post
  12. Multivariate Analysis assistance needed

    I have conducted a survey on online privacy sensitivity. Part of the survey used a previously-proven instrument to generate a Privacy Sensitivity...

    Started by bclifford‎, 10-14-2008 02:19 PM
    • Replies: 4
    • Views: 3,434
    10-14-2008, 07:42 PM Go to last post
  13. Age-Matching Groups Who Differ on Age

    I have two groups of children, A and B. Group A is the treatment group and has an age range of 5-7 years old. Group B is the control group and has an...

    Started by Barnzilla‎, 10-31-2008 01:40 PM
    • Replies: 4
    • Views: 5,801
    11-06-2008, 02:17 PM Go to last post
  14. Pilot Study Numbers

    What is an appropriate number of responses for a pilot study? I'm trying to find something in the literature to support the size. Specifically, since...

    Started by lph2005‎, 11-06-2008 10:56 AM
    • Replies: 4
    • Views: 14,201
    11-11-2008, 01:27 PM Go to last post
  15. non-parametric test for repeated measurement

    Hello everyone, I would like to know if some non-parametric test is available to asses wether 2 samples come from the same distribution for repeated...

    Started by alstublieft‎, 11-14-2008 11:16 AM
    • Replies: 4
    • Views: 5,358
    11-17-2008, 04:34 AM Go to last post
  16. Normal? Bimodal normal? Some other distribution?

    Hello! I am a newbie here. First I want to say HI to everyone! :) And I do have a question here. I am trying to model my data that ideally is...

    Started by statsCZ‎, 12-05-2008 01:31 PM
    • Replies: 4
    • Views: 18,295
    01-28-2009, 08:31 AM Go to last post
  17. jackknife

    HI all, can some body pls let me know how can i do a jackknife regression. Actually i have done stepwise regression analysis and now i have to apply...

    Started by Mobushir riaz Khan‎, 12-05-2008 07:09 PM
    • Replies: 4
    • Views: 7,907
    12-06-2008, 06:30 PM Go to last post
  18. Learning More... but where?

    Hey y'all, I've been reading quite a few posts for awhile and it's been really neat to see people talking about statistics in such an invested...

    Started by Laelsa‎, 02-27-2009 09:09 PM
    • Replies: 4
    • Views: 2,301
    02-28-2009, 08:35 PM Go to last post
  19. 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: 4,007
    03-04-2009, 12:39 AM Go to last post
  20. Lightbulb Obtaining Residuals in Chi Square Goodness of Fit

    Another question re: goodness of fit testing, Is the procedure for obtaining standardized residuals the same ? The PhD student who leads the...

    Started by Fred‎, 04-27-2009 11:13 AM
    • Replies: 4
    • Views: 4,547
    04-28-2009, 11:01 AM Go to last post
  21. VERY RELEVANT MORTGAGE-RESEARCH in this crisis

    Within the firm I work for the question exists whether there are common characteristics within (between) more or less 900 cases/dossiers which we...

    Started by dennishoogeboom‎, 05-18-2009 05:05 AM
    • Replies: 4
    • Views: 3,087
    05-27-2009, 08:39 PM Go to last post
  22. comparing means\unequal(small) size group

    Hi, I am about to use student t test to compare the mean of two independent groups. The first group sample size is 4 and another one is 24. Can I...

    Started by apahliani‎, 08-16-2009 03:51 PM
    • Replies: 4
    • Views: 26,291
    08-18-2009, 12:00 AM Go to last post
  23. Simple regression

    Hi, I am having a problem and I know a way to solve but don't know how to statistically implement it. I'm trying to summarize the problem in a...

    Started by aimanusarma‎, 12-19-2009 03:44 AM
    • Replies: 4
    • Views: 2,808
    12-25-2009, 09:18 PM Go to last post
  24. Significance of Correspondence Analysis clusterings

    Dear All, I would like to ask you about Correspondence Analysis. I am wondering if does any strategy exist to test the significance of the...

    Started by gianmarco‎, 12-30-2009 01:28 PM
    • Replies: 4
    • Views: 4,599
    01-03-2010, 02:27 AM Go to last post
  25. how to measure love/hate

    Any idea about how can one develop a scale (Likert) to measure concepts like love, liking, hate etc towards some prominent leaders from certain...

    Started by Dr.Appalayya‎, 01-22-2010 01:02 AM
    • Replies: 4
    • Views: 5,577
    04-13-2010, 01:27 PM Go to last post
  26. probability inequality

    Let X be a random variable such that |X|<=C (bounded). Let f be an even, non decreasing function over the positive values of x. Prove that: /f(C)...

    Started by Zanetti‎, 02-04-2010 04:29 AM
    • Replies: 4
    • Views: 2,595
    02-06-2010, 05:53 PM Go to last post
  27. another MLE please

    f(x)=e^-(x-\theta) -(x-\theta) is the exponent x>\theta I need to find MLE for \theta I tried doing it with a graph, but I got strange...

    Started by WeeG‎, 06-09-2010 09:33 AM
    • Replies: 4
    • Views: 5,315
    06-09-2010, 02:09 PM Go to last post
  28. 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: 4,166
    07-06-2010, 09:40 PM Go to last post
  29. Question What is the accepted Confidence Interval for a Business research..

    Hi all, I need to know the accepted Confidence Level (e.g. whether it is 95% or 99%) and the accepted "Confidence Interval" (e.g. if it is 10 or...

    Started by sachitha‎, 07-24-2010 11:33 PM
    • Replies: 4
    • Views: 8,883
    07-31-2010, 11:15 AM Go to last post
  30. Interpret statistical data - Relative risk, power, and significance?

    "We estimated that a sample size of 1240 patients followed up for an average of 3 years would lead to detection of a 33% difference in the relative...

    Started by nana0709‎, 08-27-2010 08:14 AM
    • Replies: 4
    • Views: 6,246
    08-28-2010, 03:53 AM Go to last post
  31. How many random events to cover everything with 95% confidence?

    Ok so I have what I believe to be a rather easy question, which I even feel I should be able to solve myself, but I can't... I hope someone can help...

    Started by I_do‎, 09-15-2010 02:28 PM
    • Replies: 4
    • Views: 2,973
    09-22-2010, 03:14 AM Go to last post
  32. suitable statistical method

    Hi all, This is my first post here. I have a data (Subset-A) requiring statistical treatment. Descriptive statistics of the data: Size =...

    Started by asanjuan‎, 10-04-2010 04:37 AM
    • Replies: 4
    • Views: 2,519
    10-08-2010, 04:39 AM Go to last post
  33. Help correlating Likert scale data with demographic profile

    I'm not knowledgeable about statistics, so please excuse any mistakes in phrasing. Our professor is currently on leave, and I don't have anybody else...

    Started by violet‎, 10-12-2010 02:57 AM
    • Replies: 4
    • Views: 6,384
    10-12-2010, 10:20 PM Go to last post
  34. Model fit and Structural Equation Modelling

    I am performing an analysis with a structural equation model (using SPSS AMOS). I am trying to figure out how to interpret/report my results. I...

    Started by moneypenny02‎, 11-10-2010 09:23 PM
    • Replies: 4
    • Views: 8,185
    12-07-2010, 04:16 PM Go to last post
  35. Low population hypothesis testing

    Hi, I'm doing statistics for a friend of mine. Problem with the data is that there are only 64 responses. Questionnaire was distributed to a...

    Started by aretai‎, 11-10-2010 07:45 AM
    • Replies: 4
    • Views: 3,517
    11-16-2010, 06:28 AM Go to last post
  36. Question problem of finding MLE

    consider a sample X_1,X_2,.....,X_n the pdf given by f(x) = \frac{1}{\mu}e^-\frac{x-\mu}{\mu} , x>\mu, \mu>0 what is the MLE of \mu? ...

    Started by Sambit‎, 11-18-2010 08:12 AM
    • Replies: 4
    • Views: 3,360
    11-19-2010, 11:03 AM Go to last post
  37. Question re: maximum observation value falling in third quartile

    :wave: You all have been my saviors in the past whenever I've been stuck with my stats. I need to figure how I interpret the fourth quartile...

    Started by Veronica‎, 12-14-2010 04:00 PM
    • Replies: 4
    • Views: 4,764
    12-16-2010, 10:23 AM Go to last post
  38. Survey statistics

    Hi, I agreed to help a friend out with a project and am trying to find appropriate statistical tests for survey data, but I fear the survey itself...

    Started by edwardoconnor‎, 12-17-2010 07:34 PM
    • Replies: 4
    • Views: 2,813
    01-01-2011, 02:20 PM Go to last post
  39. Numerical Maximization of Massive Expression

    Hey,guys! I am real sorry if the question has been already asked, but I am really stuck with something.... I have a Likelihood Function , it...

    Started by Valen‎, 01-26-2011 08:31 AM
    • Replies: 4
    • Views: 3,055
    01-26-2011, 05:01 PM Go to last post
  40. What statistical test should I use?

    I have created high and low variables from 1 variable. I want to see whether the mean of the "high" subjects differs from the mean of the "low"...

    Started by lilchicken‎, 02-09-2011 12:46 AM
    • Replies: 4
    • Views: 2,797
    02-09-2011, 05:19 AM Go to last post
  41. Statistics for data analysis

    I'm currently writing up a research practical report for a study I did as part of my degree. I've become a little stumped when it comes to the theory...

    Started by Lemon‎, 03-11-2011 08:36 AM
    • Replies: 4
    • Views: 2,858
    03-16-2011, 07:21 PM Go to last post
  42. bias of the coefficient of variation

    Is the coefficient of variation biased? How would you compute the bias of CV? Can I write E(sigma_hat/|mu_hat|) = E(sigma_hat)E(1/|mu_hat|)+ ...

    Started by zzzc‎, 03-30-2011 10:50 AM
    • Replies: 4
    • Views: 5,651
    03-30-2011, 02:38 PM Go to last post
  43. Help w/survey results!

    I am hoping someone can help me figure out how to do the following: I am a member of my child's school's accountability committee, and as such we...

    Started by astro_girl‎, 04-07-2011 07:18 PM
    • Replies: 4
    • Views: 3,495
    04-08-2011, 04:05 PM Go to last post
  44. Distribution not normal

    Hello, The Shapiro-Wilk test of normality on my data indicates that the distribution is not normal. I have tried to compute the data, but I...

    Started by dissstat1‎, 04-08-2011 08:07 PM
    • Replies: 4
    • Views: 3,306
    04-11-2011, 05:29 PM Go to last post
  45. chi-square post-hoc tests?

    Hi there, I've been searching the forum and elsewhere to figure out how to interpret my chi-square results and I can't find anything that relates to...

    Started by mogetons‎, 04-13-2011 03:13 PM
    • Replies: 4
    • Views: 15,468
    04-16-2011, 02:54 PM Go to last post
  46. KS or Wilcoxon?

    I have some survey data which I want to analyse using non-parametric test. It is a single sample (approx. 100) It is ordinal - likert scale e.g....

    Started by Blom‎, 04-18-2011 04:43 PM
    • Replies: 4
    • Views: 5,807
    04-21-2011, 01:37 PM Go to last post
  47. HLM and SEM

    I'm not sure if this is the right forum for this question, but I'll keep my fingers crossed... I'm in a Ph.D. program and am definitely more of a...

    Started by strumpeace‎, 05-12-2011 10:33 PM
    • Replies: 4
    • Views: 7,647
    05-14-2011, 02:31 PM Go to last post
  48. Analyzing Likert scale

    Hi, I am doing my research on QWL prevailing in Industry. I have collected data through questionnaire on 5 point likert scale, 1=strongly disagree...

    Started by JSahni‎, 04-29-2011 03:10 PM
    • Replies: 4
    • Views: 11,009
    05-01-2011, 07:56 AM Go to last post
  49. Test in binomial distribution

    Hi all. I have been staring at Table 3 in the attached paper for some time now. I can't figure out how they came up with their p-values. I does...

    Started by mads_st‎, 05-06-2011 06:37 AM
    • Replies: 4
    • Views: 2,352
    05-06-2011, 12:27 PM Go to last post
  50. Need help with data analysis

    Ok so here is the situation. I have a data set that I'm not really sure how to analyze. I have a list of 500,000 scores and each score has a value....

    Started by yoman2‎, 05-12-2011 12:54 PM
    • Replies: 4
    • Views: 1,683
    05-13-2011, 03:16 PM Go to last post
  51. Difficult forecasting/ density estimation problem in an experimental setting

    Hi everyone, I am researcher conducting a set of economics experiments that are eventually supposed to produce some forecasts for a given player’s...

    Started by whaddup‎, 07-02-2011 04:23 PM
    • Replies: 4
    • Views: 3,196
    07-05-2011, 12:27 PM Go to last post
  52. Kappa Help!!!

    Please could you help - I'd like to do a kappa stat on following data: 8 rates, 6 papers - each judging whether the paper contains a certain...

    Started by LizR‎, 07-14-2011 07:49 AM
    • Replies: 4
    • Views: 1,939
    07-28-2011, 08:26 AM Go to last post
  53. F-test Analyis HELP

    I've just carried out an f-test on excel as I want to perform an independent t-test so I wanted to check the equality of variances. I have always...

    Started by cheekychica‎, 07-15-2011 01:30 PM
    • Replies: 4
    • Views: 2,791
    07-16-2011, 03:45 PM Go to last post
  54. Research Query

    Hello, hope someone can help. I've been having trouble with some data I have collected. I have been taking a series of 12 measurements using three...

    Started by PB66‎, 07-19-2011 11:26 AM
    • Replies: 4
    • Views: 2,899
    07-20-2011, 12:40 AM Go to last post
  55. Smile Help!! Mini stat survey!

    Hi all mathies, I have a favor to ask. My friends and I are currently working on our stat project. It's very short and we'll really appreciate...

    Started by lweng‎, 07-20-2011 06:42 PM
    • Replies: 4
    • Views: 1,604
    07-20-2011, 08:45 PM Go to last post
  56. Analysis Workflow: Best practices

    Hello all, I hope this finds everyone doing well. I have a couple of questions about workflow for analyses. Hopefully, this will be of broad...

    Started by jpkelley‎, 07-23-2011 04:03 PM
    workflow
    • Replies: 4
    • Views: 2,336
    07-23-2011, 11:55 PM Go to last post
  57. Series of T-Tests

    Hi All, I have a theoretical question... I have a categorical variable with two levels, and around 200 continuous variables. I wanted to check...

    Started by NN_STAT‎, 08-04-2011 01:29 AM
    • Replies: 4
    • Views: 3,305
    08-04-2011, 02:28 PM Go to last post
  58. non parametric hierarchical regression?

    Hello, I have non parametric data and need to condcut a regression with covariates as well. I have tried to transform the data but still they are...

    Started by fliss‎, 08-30-2011 12:06 PM
    • Replies: 4
    • Views: 5,517
    08-30-2011, 03:43 PM Go to last post
  59. Shapiro-Wilk normality test: what is the null distribution

    Hi everyone The Title says it all. I'd like to know what is the null distribution of the Shapiro-Wilk test statistic. I'm also curious to see it's...

    Started by longrob‎, 09-07-2011 09:10 AM
    • Replies: 4
    • Views: 5,129
    09-08-2011, 04:16 AM Go to last post
  60. Question about phi range in AR(1) process

    Hello, Makridakis Forecasting text book says that phi should be restricted to -1<phi<1. I thought that this restriction should exist only if we...

    Started by zarasandreas‎, 09-08-2011 04:29 AM
    • Replies: 4
    • Views: 5,149
    09-08-2011, 02:08 PM Go to last post

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