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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: 18,712
    10-11-2014, 12:02 PM Go to last post
  1. strengths and weaknesses of unpaired t-test

    I would like to find out the strengths and weaknesses of using an unpaired t-test for testing for the difference in means

    Started by andrew03‎, 02-03-2011 04:40 PM
    • Replies: 1
    • Views: 9,609
    02-03-2011, 10:12 PM Go to last post
  2. Question Perception of non-parametric techniques as inferior?

    Hi guys, I've recently worked on a project supervised by a lecturer in the school of psychology at my university. She's been looking over the...

    Started by CowboyBear‎, 05-07-2009 02:55 AM
    • Replies: 3
    • Views: 9,568
    05-08-2009, 06:17 AM Go to last post
  3. Chi Square for Likert Scale in Single Sample

    Evening All, I do hope someone can shed some light on my fog of the chi square. I conducted a single sample survey using Likert Scale scored 1-5...

    Started by smithtl68‎, 01-07-2014 08:10 PM
    chi square, cluster randomized, hypotheisis testing, likert scale, null hypothesis
    • Replies: 3
    • Views: 9,562
    01-23-2014, 10:18 AM Go to last post
  4. Exclamation Which test to use for Qualitative study? Power analysis?

    For a qualitative study that only involves structured interviews which test is appropriate for analyzing the data? Also, how do I do a power analysis...

    Started by sarahfiedler‎, 02-07-2011 08:25 PM
    • Replies: 1
    • Views: 9,553
    02-08-2011, 05:04 AM Go to last post
  5. Comparison of time series

    Hi there, firstly I would like to say that I'm newbie here, so hi everyone, and please be patient if I do something wrong. And sorry for my level...

    Started by nofuj‎, 09-13-2010 01:35 AM
    • Replies: 2
    • Views: 9,345
    09-17-2010, 11:58 AM Go to last post
  6. Mediation Analysis with Categorical IV with 4 levels

    Hello all, I would like to do a mediation analysis using the following 3 variables: 1. Integration Strategy: This is the independent variable. It...

    Started by tez_s‎, 08-15-2012 07:20 AM
    dummy coding, mediation analysis, regression
    • Replies: 4
    • Views: 9,329
    12-16-2014, 08:27 PM Go to last post
  7. Coding Open Ended Questions

    Hi, Can anyone tell me where I would begin if I wanted to code some open ended questions? People tell me it's easy, but I don't know; where or...

    Started by statman13‎, 08-04-2008 05:17 AM
    • Replies: 2
    • Views: 9,281
    08-19-2008, 10:32 PM Go to last post
  8. Repeated Measures ANOVA with a Continuous Variable?

    Hi, I'm trying to run a repeated measures ANOVA. There's a continuous variable that's affecting my data, that I need to control for. I tried...

    Started by Lola‎, 08-20-2008 10:01 AM
    • Replies: 2
    • Views: 9,266
    08-27-2008, 04:11 PM Go to last post
  9. How to analyze different, complex data sets?

    I'm looking for a good way to compare data sets. For 20 months, we collected larval fish using standard sampling gear (produces larval fish/cubic...

    Started by The_Hand_Hunter‎, 01-20-2011 01:23 PM
    ecological statistics, study design
    • Replies: 3
    • Views: 9,166
    01-25-2011, 04:13 AM Go to last post
  10. two questionnaires correlation with a Likert-type scale

    Hello Imagine we want to know how much correlation is there between amount of stuff people buy and amount of that stuff which they consume? (its...

    Started by sevensea‎, 10-31-2013 01:51 PM
    • Replies: 6
    • Views: 9,133
    11-01-2013, 07:43 AM Go to last post
  11. Wilcoxon Signed Rank test or Spearman's rho?

    Dear madam/sir, My apologies for posting so quickly yet another question, but hopefully you can help me out once more. I'm still analyzing my survey...

    Started by blubblub‎, 04-19-2013 09:08 AM
    • Replies: 3
    • Views: 9,086
    04-19-2013, 12:12 PM Go to last post
  12. chi-square with small sample size

    I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

    Started by fishystats‎, 05-19-2011 10:39 PM
    • Replies: 6
    • Views: 8,955
    05-20-2011, 12:24 PM Go to last post
  13. 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: 8,903
    07-31-2010, 11:15 AM Go to last post
  14. Fisher's exact test

    I have always learned that if you have a contingency table that violates the chi square assumption of more than 20% of cells having expected count...

    Started by shanehall.m‎, 08-31-2011 09:46 AM
    categorical data, chi square, exact test, post hoc test
    • Replies: 3
    • Views: 8,892
    09-01-2011, 02:02 PM Go to last post
  15. Negative binomial regression / poisson regression

    Does anyone have experience with STATA? and more specifically how to conduct a negative binomial regression in stata? My problem is that i dont...

    Started by paul de boer‎, 08-27-2010 09:56 AM
    • Replies: 2
    • Views: 8,817
    08-28-2010, 04:24 AM Go to last post
  16. Forest Plots - Please Help!!!!!

    How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

    Started by Astero‎, 06-22-2011 12:44 PM
    forest plots, statistics, statistics help
    • Replies: 3
    • Views: 8,799
    06-22-2011, 05:55 PM Go to last post
  17. paired samples-equality of variance and 95% CI around difference

    Hi, Can a few of you please review the approach I plan to take for obvious errors? I have 50 subjects and each have a measure taken on the same...

    Started by seth‎, 08-02-2011 11:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 8,743
    08-06-2011, 10:29 PM Go to last post
  18. nonparametric test for Two-way repeated measures ANOVA?

    What is a nonparametric test for Two-way repeated measures ANOVA?

    Started by eunkum‎, 11-01-2012 12:14 PM
    • Replies: 0
    • Views: 8,697
    11-01-2012, 12:14 PM Go to last post
  19. Logistic regression - different cutpoints for classification and probability?

    I was reading an article on logistic regression tonight, and I noticed the following: "Logistic regression can be used to classify observations as...

    Started by james‎, 02-22-2009 10:03 PM
    • Replies: 2
    • Views: 8,684
    02-24-2009, 05:55 AM Go to last post
  20. Question about copula-GARCH models

    Hello everyone, I am learning about copulas and also do some MATLAB coding to get better understanding of how copulas work. Recently I have...

    Started by Peskarik‎, 06-20-2008 04:39 PM
    • Replies: 3
    • Views: 8,636
    06-26-2008, 03:15 AM Go to last post
  21. SEM - indirect effects

    Hi all, Software for SEM (Amos, Lisrel) provides estimates for indirect effects, and small size coefficients are often found to be statistically...

    Started by luic‎, 03-18-2011 02:46 AM
    • Replies: 1
    • Views: 8,602
    03-18-2011, 03:41 AM Go to last post
  22. t-tests or mann-whitney??

    Hello, I have a n=12 sample (and a matched-sample of 12)... I was planning on using t-tests, but now reconsidering it. Would it be correct to use...

    Started by zxcvbnm‎, 03-28-2009 02:16 PM
    • Replies: 2
    • Views: 8,565
    05-03-2009, 06:41 PM Go to last post
  23. Deck of cards: Odds of being dealt 3 of a suit?

    I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

    Started by domino‎, 09-15-2008 03:31 AM
    • Replies: 2
    • Views: 8,532
    09-15-2008, 09:46 AM Go to last post
  24. Calculating the standard error of an odds ratio from the standard errors of 2 logits

    I've just completed a logistic regression model with a continuous covariate, and calculated the logit and standard errors using SAS for creating a...

    Started by Disvengeance‎, 12-13-2014 09:53 PM
    3 Pages
    1 2 3
    • Replies: 35
    • Views: 8,523
    12-18-2014, 10:02 PM Go to last post
  25. Need good, fast stats help, will pay, help on dissertation, inferential analysis ONLY

    I need a stats coach to sort out the inferential stats part of my dissertation - that's all. The SPSS file is done, I have 109 "good" pages of the...

    Started by purplelily‎, 01-21-2014 11:35 PM
    6 Pages
    1 2 3 ... 6
    • Replies: 77
    • Views: 8,348
    02-03-2014, 06:18 AM Go to last post
  26. What is the point of providing p-values for baseline characterisitics?

    I just have a general question about what the point is of have baseline characteristics and then presenting p-values for these. Is the p-value...

    Started by chiccaboom‎, 05-01-2012 11:19 PM
    • Replies: 3
    • Views: 8,298
    05-29-2012, 02:13 PM Go to last post
  27. 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: 8,196
    12-07-2010, 04:16 PM Go to last post
  28. Adding Random Variables from Logistic Distributions

    Given two logistic distributed random variable: ( mu_1, s_1 ) and ( mu_2, s_2 ) what is the sum of the variable? I tried monte carlo on (...

    Started by JoeyM‎, 05-12-2010 03:31 PM
    • Replies: 2
    • Views: 8,189
    05-13-2010, 04:36 PM Go to last post
  29. confidence interval for combined data

    Hi everyone, I'm new here, so forgive me if I don't get something quite right. I have a question for how best to do a confidence analysis of a set...

    Started by Trey‎, 06-22-2009 12:57 PM
    • Replies: 5
    • Views: 8,153
    06-24-2009, 02:32 PM Go to last post
  30. non-significant Paired T-test, what happens next??

    Hi, I'm analysing my data for my master's dissertation and I'm having problems! I have 3 "before" and "after" treatment groups (n=20 each) and...

    Started by Joelle‎, 10-30-2011 12:48 PM
    anova, paired t-test
    • Replies: 7
    • Views: 8,137
    11-09-2011, 12:42 PM Go to last post
  31. How to correct negative skew

    My dependent variable is negatively skewed with 5 outliers. How do you correct a negative skew? Thanx.

    Started by elf212‎, 07-21-2010 08:20 PM
    • Replies: 2
    • Views: 8,129
    07-23-2010, 05:03 PM Go to last post
  32. p =.046 significant?

    If I get a probability value of .046 is this considered significant given significance level of .05?

    Started by godfather‎, 08-24-2009 07:14 PM
    • Replies: 5
    • Views: 8,010
    09-02-2009, 10:46 AM Go to last post
  33. 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: 7,923
    12-06-2008, 06:30 PM Go to last post
  34. Difficulty with Rank-biserial correlation coefficient, N = 5

    Hi there, I am calculating Difficulty with Rank-biserial correlation coefficients in a spreadsheet using the following formula: rb = (2/n)*(Y1...

    Started by BOAZ‎, 01-22-2012 05:59 PM
    rank-biserial correlation
    • Replies: 6
    • Views: 7,819
    01-22-2012, 08:49 PM Go to last post
  35. comparing two measurements over time

    I'm designing an experiment with two condition. Cond A with no manipulation of the independent var and ConB with manipulation of the independent var....

    Started by dirkheld‎, 08-22-2007 07:11 AM
    • Replies: 8
    • Views: 7,794
    08-27-2007, 04:38 AM Go to last post
  36. Diebold and Mariano Test

    Hello, I'm currently writing an article about stock return predictability. I have 2 predictive regression models, where I calculated for both the...

    Started by tjeu‎, 04-06-2012 02:24 AM
    • Replies: 1
    • Views: 7,776
    09-18-2015, 01:21 PM Go to last post
  37. Correction for multiple testing when tests are dependent

    Dear all, I have a following problem: given N variables, I calculate N(N-1)/2 correlation coefficients, each against each (this is commonly used...

    Started by jw3‎, 04-08-2011 04:24 AM
    • Replies: 3
    • Views: 7,747
    04-08-2011, 02:24 PM Go to last post
  38. Significance testing for proportions (NPS)

    I have 2009 and 2010 NPS (Net Promoter Score) survey results. Now I want to test if the change in 2010 NPS from 2009 is statistically significant or...

    Started by Kevin_ind‎, 03-01-2011 02:26 AM
    • Replies: 2
    • Views: 7,732
    03-07-2011, 05:17 AM Go to last post
  39. Transform data for outlier analysis?

    Hey everyone, I have a data set which is log normally distributed and want to detect outliers, so far I used a threshold approach: vector...

    Started by bontus‎, 11-09-2011 11:59 AM
    outlier, transform
    • Replies: 10
    • Views: 7,724
    11-10-2011, 05:37 AM Go to last post
  40. 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: 7,709
    05-14-2011, 02:31 PM Go to last post
  41. Test of Significance?

    I want to conduct a significance test in finding the significance between either a C+ vs a B- in AP statistics class will affect chances of attending...

    Started by columbia‎, 06-21-2011 09:49 PM
    3 Pages
    1 2 3
    • Replies: 42
    • Views: 7,679
    06-24-2011, 06:30 PM Go to last post
  42. Polychoric Principal Component Analysis

    Hi everyone: I am working with a questionnaire to evaluate socioeconomic position in a sample. It was basically counting a list of items to assess...

    Started by JavierM88‎, 06-23-2014 12:08 PM
    2 Pages
    1 2
    pca, polychoric
    • Replies: 19
    • Views: 7,668
    06-27-2014, 01:30 PM Go to last post
  43. data transformation links please

    Can anyone suggest a guide or link for more information on the transformation or non normally dirtibuted data? many thanks yoma

    Started by yoma819‎, 08-15-2010 04:25 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,629
    08-16-2010, 11:59 AM Go to last post
  44. Preference - which statistical method?

    I'm conducting an experiment on female preference with respect to male colouration (black vs. white male mice). The results of the experiment...

    Started by scully101‎, 01-15-2011 02:19 PM
    • Replies: 3
    • Views: 7,617
    01-15-2011, 03:38 PM Go to last post
  45. compare unequal-size groups, Likert scale, t-test

    Hello! I have 28 students questionnaires to analyse, these 28 students distributed into 3 groups. in the experiment the 3 groups were put in the...

    Started by Velingrad‎, 09-22-2009 06:58 AM
    • Replies: 1
    • Views: 7,613
    10-19-2009, 01:17 AM Go to last post
  46. strengths and weaknesses of Chi squared

    I would like to find out the strengths and weaknesses of using a chi squared test for goodness of fit testing

    Started by andrew03‎, 02-03-2011 04:35 PM
    • Replies: 0
    • Views: 7,613
    02-03-2011, 04:35 PM Go to last post
  47. Repeated measure ANOVA shows a significant difference but not post-hoc analysis

    Hi, I am kind of new to statistics and I did a comparison that I can't really digest its results. My participants rated the usefulness of 7...

    Started by peejay‎, 08-29-2011 01:35 PM
    • Replies: 2
    • Views: 7,544
    08-29-2011, 04:08 PM Go to last post
  48. Joint Normal CDF

    Hello I am new to this forum as well as to actuary field. I have this question: There are two random variables X_1 and X_2 following standard...

    Started by hpriye‎, 06-19-2008 05:10 AM
    • Replies: 7
    • Views: 7,538
    06-20-2008, 08:13 AM Go to last post
  49. Finding the cov matrix of MLE using Hessian

    To properly calculate the covariance of an MLE you would need to find the inverse of the Fisher information matrix, evaluated at the MLE. And this...

    Started by paralleluniverse‎, 09-10-2010 11:02 AM
    • Replies: 1
    • Views: 7,536
    09-10-2010, 03:20 PM Go to last post
  50. Levene's Test - Large F Value

    Hi all, My F Statistic from Levene's Test is very high. The significance is .000. My question is: should an independent T-test even be used...

    Started by PoLyGLoT‎, 10-01-2009 10:16 PM
    • Replies: 1
    • Views: 7,531
    10-02-2009, 11:02 AM Go to last post
  51. Discrete distribution with var larger than mean

    Hi, everyone. Is there any statistical distribution (other than binomial) with its variance larger than its mean? Preferably, a distribution which...

    Started by tsukiko‎, 10-29-2011 10:13 PM
    • Replies: 3
    • Views: 7,528
    10-30-2011, 12:41 AM Go to last post
  52. Which test to run (pretest-posttest)

    Hi there! What is the best test to use to analyze data involving a pretest and posttest given to two different treatment groups? Thanks!

    Started by Brandi‎, 02-10-2011 02:01 PM
    • Replies: 10
    • Views: 7,525
    02-11-2011, 10:46 PM Go to last post
  53. residuals against Y

    Hi all- I'm looking for an argument / example in simple linear regression, if you plot the residuals against Y, there appears to be a relationship...

    Started by B_Miner‎, 09-29-2009 03:06 PM
    • Replies: 7
    • Views: 7,520
    09-30-2009, 11:23 AM Go to last post
  54. 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: 7,515
    10-10-2011, 05:24 PM Go to last post
  55. finding quantiles

    how do you find the quantile of a single number in a distribution in R? input: number output: percentage THank you!

    Started by sleck‎, 07-31-2008 10:42 AM
    • Replies: 5
    • Views: 7,489
    07-31-2008, 04:08 PM Go to last post
  56. Can a convenience sample ever be considered truly cross-sectional?

    I'm having a debate over terminology with a colleague. We've done a small census survey (n<50) of residents and staff at a local out-patient clinic....

    Started by BSimon‎, 09-17-2013 07:41 AM
    cross-sectional, definition, design, survey
    • Replies: 4
    • Views: 7,488
    09-18-2013, 07:50 AM Go to last post
  57. significant interaction but variables not significant on their own

    Hi I was wondering if anyone could help me. I have been looking at consumers purchase intention levels across three indepedent variables, age,...

    Started by kassos‎, 11-22-2011 09:52 AM
    • Replies: 6
    • Views: 7,476
    11-30-2011, 12:38 PM Go to last post
  58. P values, z scores, 1 and 2 tailed tests... CONFUSED

    Okay, I am completely clueless when it comes to statistics, but I'm trying to figure out this stuff for grad school and I've hit a snag that I just...

    Started by theoutsyder83‎, 04-26-2010 09:31 AM
    • Replies: 1
    • Views: 7,406
    04-27-2010, 01:22 PM Go to last post
  59. sufficient statistic for joint geometric distribution

    I wonder if someone could check the attached document regarding my attempt at a Fisher-Neyman factorization of a joint geometric pdf. Thanks Rob

    Started by rob c‎, 03-20-2009 05:16 PM
    • Replies: 1
    • Views: 7,393
    03-22-2009, 08:55 AM Go to last post
  60. insufficient residual degrees of freedom

    What should I do when my SPSS output cannot produce multivariate test statistics because of insufficient residual degrees of freedom, and therefore...

    Started by ddlamb‎, 03-21-2012 06:07 PM
    • Replies: 1
    • Views: 7,379
    03-21-2012, 06:20 PM Go to last post

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