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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: 18,696
    10-11-2014, 12:02 PM Go to last post
  1. one sample t-test alternative

    Hello, I hope someone can help me, because I am getting crazy with this. Imagine the following scenario: I have several participants. Each...

    Started by ajestudillo‎, 04-09-2014 11:41 AM
    • Replies: 13
    • Views: 2,231
    04-10-2014, 07:08 AM Go to last post
  2. item-scale correlation

    Hi, When running an item-scale correlation, what does it mean when research have corrected for overlap? Is there a way to do this in SAS?

    Started by proc1125‎, 10-02-2014 04:49 PM
    • Replies: 13
    • Views: 4,943
    10-21-2014, 12:19 PM Go to last post
  3. What model should I use? Mixed-effect model?

    Hello guys, I really hope you can help me with this. Any ideas/suggestions are welcome. My main goal is to create a model that predicts which...

    Started by Marvin85‎, 03-16-2016 02:22 PM
    • Replies: 13
    • Views: 2,757
    06-14-2016, 11:05 PM Go to last post
  4. Angry Correlation

    I have a list of vehicle models and a number of costs associated with them. For example: Mazda 1000.50 euro Peugeot 2000.23 euro Mazda...

    Started by maltesedog‎, 12-03-2008 03:22 AM
    • Replies: 12
    • Views: 2,857
    12-04-2008, 09:32 AM Go to last post
  5. Optimal combination of conditions

    I am looking to find an efficient process to determine the set of conditions that results in the optimal likelihood of accomplishing some task. ...

    Started by haz33‎, 02-03-2011 04:30 PM
    • Replies: 12
    • Views: 4,379
    02-06-2011, 02:55 PM Go to last post
  6. General vs Generalized Linear Models

    While defending my thesis yesterday, this difference was pointed out. Surprised that there was actually a difference I wasn't aware of, I've looked...

    Started by Link‎, 03-09-2011 01:51 PM
    • Replies: 12
    • Views: 13,621
    06-23-2015, 12:52 PM Go to last post
  7. Comparing distributions

    I'm working on analyzing data for a prof for publication and have come to a situation that I am lacking confidence in and am coming here for help. ...

    Started by trinker‎, 03-02-2012 03:54 PM
    • Replies: 12
    • Views: 3,932
    05-21-2012, 10:28 AM Go to last post
  8. Analytic options with multi-level data?

    Hello, I've been struggling with choosing an analytical approach to some multi-level data (3 level) I'm working with and wanted to get some fresh...

    Started by schunajm‎, 08-05-2012 02:52 PM
    • Replies: 12
    • Views: 2,881
    01-31-2013, 01:15 PM Go to last post
  9. Random or fixed slope in hlm?

    Hello, I am doing multilevel analysis and I am not sure whether I should include a random slope or not. The Wald test produces the following...

    Started by Julie30‎, 08-17-2012 09:15 PM
    • Replies: 12
    • Views: 12,123
    08-19-2012, 03:27 PM Go to last post
  10. Limit of standard normal CDF(x) as x goes to ∞?

    Let N:\mathbb{R} \to be the CDF of the standard normal density function. I want to evaluate: \lim_{b\to 0^+} N(\frac{a}{b}). Clearly this is...

    Started by derksheng‎, 10-15-2012 10:32 PM
    • Replies: 12
    • Views: 95,081
    10-18-2012, 09:39 AM Go to last post
  11. Some help in selecting appropriate tests

    Hi. I'm currently conducting some research which requires me to analyse change in scores on a 34 item self-report questionnaire. The questionnaire...

    Started by LeeVanCleef‎, 06-21-2013 04:17 AM
    • Replies: 12
    • Views: 2,001
    08-26-2013, 02:50 PM Go to last post
  12. Can anyone explain Poisson regression for doing time trend?

    It would be a big help if someone could give a practical example (by hand) how Poisson regression is used to calculate a time trend line, and...

    Started by daniel_goldman‎, 02-18-2014 04:40 AM
    poisson regression, time trend
    • Replies: 12
    • Views: 6,721
    02-19-2014, 06:52 PM Go to last post
  13. Monte Carlo simulation: how many runs?

    Hi, Most papers I read related to Monte Carlo (MC) simulation method say that there is no rule on the minimum number of runs required. However, in...

    Started by AlinaN‎, 04-05-2015 11:11 PM
    monte carlo
    • Replies: 12
    • Views: 6,085
    04-07-2015, 06:21 AM Go to last post
  14. Power calculation with measurement error on Y

    I'm trying to do a power calculation for a study I'm involved in, and I'm a bit stuck. The study is about textual cues of trust. We want to...

    Started by Junes‎, 11-01-2016 07:22 AM
    measurement error, multicolinearity, power
    • Replies: 12
    • Views: 3,636
    11-01-2016, 07:02 PM Go to last post
  15. which statistical test to use - Observed difference in outcome is due to chance?

    Hi, I have results from two very sensitive but different lab test trying to find pathogen in a patient sample. For some patients, results from two...

    Started by deepbiomed‎, 11-03-2016 08:49 PM
    • Replies: 12
    • Views: 3,672
    11-06-2016, 08:07 PM Go to last post
  16. Repeated k-fold Cross-Validation

    I saw this: "Any advices on practice? It depends on the data, but it's common to find examples cases 10 fold CV, plus repetition: 10 fold CV,...

    Started by hlsmith‎, 12-09-2016 02:49 PM
    • Replies: 12
    • Views: 7,121
    12-16-2016, 10:35 AM Go to last post
  17. Random Sampling - Missing Something Easy and I know it

    Hello everyone, I was asked to look over some data that came across my desk and I was stumped as to why it came out the way that it did. So the...

    Started by txsnowman‎, 07-24-2017 04:25 PM
    • Replies: 12
    • Views: 859
    07-25-2017, 11:21 AM Go to last post
  18. Help Anova

    hi everyone, I currently try to find an open source C/C++statistical library. Basically, I want to calculate the p and F value from oneway (or N...

    Started by 02020954‎, 12-12-2005 07:11 PM
    • Replies: 11
    • Views: 4,627
    12-14-2005, 05:55 PM Go to last post
  19. Eigenvector for large matrices

    Well, this is kind of a linear algebra question, but is used very often in statistics, so it seems applicable for this forum. My question is, does...

    Started by senorbum‎, 06-30-2008 09:01 AM
    • Replies: 11
    • Views: 7,021
    07-01-2008, 01:58 PM Go to last post
  20. Random Variables and Correlation

    I claim that if x is a normal distributed random variable, and y is a uniformly distributed random variable then x and y cannot have a correlation of...

    Started by rsherry8‎, 11-17-2008 10:14 PM
    • Replies: 11
    • Views: 5,662
    11-20-2008, 03:47 PM Go to last post
  21. Mle

    Hi guys, I need advice regarding this question: The height of students at university is a random variable from the N(\mu,25) distribution. A...

    Started by WeeG‎, 06-08-2010 06:21 AM
    • Replies: 11
    • Views: 3,289
    06-10-2010, 01:17 PM Go to last post
  22. Red face Confused regarding Principal Component Analysis

    Hi all, I have a scenario in which I was advised to use Principle Component Analysis but my knowledge of stats is fairly rudimentary so I am...

    Started by yayo1984‎, 09-13-2010 01:40 AM
    • Replies: 11
    • Views: 3,281
    09-13-2010, 08:34 PM Go to last post
  23. Modelling the yield from sports bets - Potentially using a mixture of distributions?

    Hello all, A friend of mine asked me to analyze some data which comes from placing bets on sports. Having read quite a few threads and seeing how...

    Started by chaps‎, 03-25-2011 03:05 PM
    • Replies: 11
    • Views: 5,545
    04-01-2011, 03:35 PM Go to last post
  24. Reduce number of predictor variables ((multi)collinearity): PCA not helpful

    Howdy, The attached spreadsheet contains the correlation matrix of predictor variables and response variable. Correlation exists between them. ...

    Started by nofunsally‎, 06-23-2011 04:31 PM
    • Replies: 11
    • Views: 6,102
    07-13-2011, 10:15 AM Go to last post
  25. 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: 4,069
    09-13-2011, 01:28 PM Go to last post
  26. 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: 5,496
    10-20-2011, 11:11 AM Go to last post
  27. differences between values a meaningful unit (I like cake too)

    Alright I'm still working away on my problem of distance between different types of behavior. I can calculate distances between occurrences and spit...

    Started by trinker‎, 11-02-2012 09:00 PM
    • Replies: 11
    • Views: 2,007
    11-04-2012, 01:01 AM Go to last post
  28. Using a t test not giving me what I want

    Good afternoon all, I'm writing a procedure to simply identify if 2 values are significantly different enough to update the procedure. As an...

    Started by davisd39‎, 08-23-2013 12:11 PM
    • Replies: 11
    • Views: 1,669
    08-28-2013, 06:27 AM Go to last post
  29. Analysis of a matched case-control study

    Please, i need help on my analysis. It is a 1-1 matched case-control studies. I am willing to pay for the guidance. My deadline is friday.

    Started by Madonna‎, 01-27-2014 04:04 AM
    • Replies: 11
    • Views: 2,799
    01-27-2014, 10:17 AM Go to last post
  30. 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: 2,269
    02-26-2014, 09:29 AM Go to last post
  31. Small difference but still significant?

    I hae sample size of 67 participants. They took a pre and post knowledge survey. The maximum score was 14 answers correct. I run a pair ttest. These...

    Started by Marvin85‎, 11-10-2014 02:38 PM
    pvalue, significant
    • Replies: 11
    • Views: 2,682
    11-30-2014, 03:42 AM Go to last post
  32. help with Normality test?

    Hi all! this is probably a simple question; however, my statistics skills got a bit rusty and I cannot find an appropriate solution on the...

    Started by nicola‎, 06-16-2015 05:04 PM
    normality test
    • Replies: 11
    • Views: 1,528
    06-23-2015, 03:51 PM Go to last post
  33. What is Endogeneity?

    Hi! The title says it all. I am a health care worker currently going through a really interesting paper. I have some experience in statistics but...

    Started by plagoniste‎, 09-17-2015 03:31 PM
    • Replies: 11
    • Views: 2,965
    09-17-2015, 08:44 PM Go to last post
  34. Assumptions for mix design anova with covariates

    Hello I Would like to nake a mix design (I HAVE TWO GROUPS -SICK AND HEALTHY), AND I made a cognitive measure of long / short exposure stimulus. ...

    Started by talgef‎, 12-26-2015 07:03 AM
    • Replies: 11
    • Views: 2,488
    01-01-2016, 01:36 PM Go to last post
  35. Theoretical Regression Problems

    What is the term for when your outcome variable is truncated and that may be dampening your results? For example, you use a dichotomous outcome for...

    Started by kmed‎, 02-06-2017 03:52 PM
    • Replies: 11
    • Views: 2,317
    02-07-2017, 09:52 AM Go to last post
  36. ITIL Remedy Help Desk Incident Data - Statistical Analysis for research

    Hello, My first thread on the board. It is my hope that I am posting this to the right thread I was wondering if you could help me with a...

    Started by hayaag‎, 07-14-2017 05:19 PM
    • Replies: 11
    • Views: 680
    07-20-2017, 09:46 AM Go to last post
  37. bell curve question

    I have data distributed unevenly on both side of the average.How do I go about normalizing the data so that it makes a perfect curve? I don't have a...

    Started by cpp_coder‎, 05-26-2008 01:49 PM
    • Replies: 10
    • Views: 6,562
    05-30-2008, 10:15 AM Go to last post
  38. Talking Shapley Value

    Hi, I'm trying to get a "Shapley Value" for determining each attributes utilities. I've already heard this could be done with simple excel or...

    Started by adamantem‎, 04-20-2009 04:43 AM
    • Replies: 10
    • Views: 13,162
    09-28-2012, 09:44 AM Go to last post
  39. 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: 7,518
    02-11-2011, 10:46 PM Go to last post
  40. Which test to believe ?

    Hi, I did some analysis, I had 1 scale variable and 1 grouping variable with 2 groups. I ran a t-test and got p value of 0.09. The distribution...

    Started by NN_STAT‎, 07-13-2011 12:19 PM
    • Replies: 10
    • Views: 4,345
    07-16-2011, 02:04 AM Go to last post
  41. power analysis for parameter estimation of a gamma distribution?

    How do I calculate the needed sample size to determine if the parameter estimates are accurate enough for a gamma distribution? Thanks.

    Started by manoa‎, 08-03-2011 09:23 PM
    • Replies: 10
    • Views: 3,632
    08-04-2011, 05:30 PM Go to last post
  42. 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: 26,722
    10-15-2011, 12:41 PM Go to last post
  43. 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: 7,716
    11-10-2011, 05:37 AM Go to last post
  44. alternative to anova

    What is an alternative statistical test to anova. I have a large varience between three groups (control and two experimental). How can I determine...

    Started by deardirestraits‎, 12-15-2011 03:37 PM
    • Replies: 10
    • Views: 5,467
    12-16-2011, 09:43 PM Go to last post
  45. Question T-test help with determining whether its 1 or 2 tailed?

    Hi, I need to perform a t-test to determine the relationship between US govt spending on Police and the number of Rapes annually. So I have 53...

    Started by kenshi64‎, 02-23-2012 11:50 PM
    statistical analysis, t-test
    • Replies: 10
    • Views: 7,119
    02-28-2012, 02:31 PM Go to last post
  46. Reporting non-statistically significant t-test

    If we assess that with alpha=.05 and beta=.8 we can evaluate the statistical power to detect effect sizes based on the sample. 783 participants are...

    Started by micdhack‎, 02-24-2012 07:14 AM
    • Replies: 10
    • Views: 11,708
    02-24-2012, 03:33 PM Go to last post
  47. Variance sum law proof

    Hey guys, I was wondering if something could get me started on a proof for the variance sum law. For the sake of clarification, I'm referring...

    Started by Rhodo‎, 03-17-2012 05:50 PM
    • Replies: 10
    • Views: 11,233
    03-17-2012, 10:10 PM Go to last post
  48. Using Mann-Whitney U?

    Hi, I'm confused about which statistic to use. I want to find out if a law in two different states influences service delivery (get referral/ do...

    Started by picaritos‎, 08-21-2012 11:22 AM
    • Replies: 10
    • Views: 3,573
    08-27-2012, 03:56 PM Go to last post
  49. Need help in hypotheses testing. Interpretation of AMOS output

    Hi, I am struggling to understand how to test the hypothesized relationships in my model. I've got 4 hypotheses to test, all 4 are hypothesized...

    Started by deto4ka‎, 04-27-2013 07:42 AM
    • Replies: 10
    • Views: 2,709
    04-28-2013, 06:29 AM Go to last post
  50. Do you need to satisfy assumptions in regression if you do 10-fold cross-validation?

    I wanted to get your opinion on this. When building models we want to make sure that the variables we have selected can be used in a model to predict...

    Started by micdhack‎, 12-23-2012 05:26 AM
    • Replies: 10
    • Views: 2,434
    12-29-2012, 06:48 AM Go to last post
  51. 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: 2,683
    04-09-2013, 07:13 PM Go to last post
  52. Need Appropriate statistical test

    Hi, I have to compare two groups data.On both groups one dependent variable and 20 independent variable.Sample size of both groups are different...

    Started by Poonam‎, 02-13-2013 04:20 AM
    • Replies: 10
    • Views: 1,818
    02-15-2013, 11:14 PM Go to last post
  53. The best predictor in regression analysis

    Hi All, Could any one explain how i can know which is the best predictor in the regression analysis. Example attached. Many thanks, Gh.

    Started by ghada8888‎, 05-09-2013 08:40 AM
    • Replies: 10
    • Views: 3,690
    05-10-2013, 03:35 PM Go to last post
  54. Roulette- reducing variance

    Hello gents. I am new here and I have a question. Is someone here has a bit of will and knowledge around some statistical software or programming...

    Started by Matko‎, 05-16-2013 01:01 PM
    • Replies: 10
    • Views: 2,839
    05-16-2013, 06:14 PM Go to last post
  55. [SOLVED] Recommendation: Journals that may have survey research

    Hopefully the title says it all. I'm trying to get more familiar with survey research (how it's written up, research questions, methods of analysis...

    Started by trinker‎, 05-28-2013 08:45 AM
    journal, psychometric, survey
    • Replies: 10
    • Views: 2,047
    05-28-2013, 09:16 PM Go to last post
  56. p-values : binomial vs. normal

    I've taken and tutor some basic statistics courses. What I've been taught is that to compute p-values (false positive rate) for hypothesis testing on...

    Started by lex logan‎, 07-18-2013 11:50 AM
    • Replies: 10
    • Views: 2,971
    08-01-2013, 07:28 PM Go to last post
  57. I.I.D assumption of T-test

    I am writing my second master's thesis now and I came across a situation where V\neq{V}. So I thought I'd test whether this need to be the case in...

    Started by Englund‎, 01-14-2014 03:40 PM
    • Replies: 10
    • Views: 3,654
    01-16-2014, 02:29 PM Go to last post
  58. Red face Interpreting Kruskal-Wallis results

    Hi all, I've just finished my undergrad thesis and the reviewers strongly recommended that I pursue formal publication of my results. I thought...

    Started by glenn.althor‎, 07-29-2014 09:47 PM
    • Replies: 10
    • Views: 4,545
    08-03-2014, 04:53 PM Go to last post
  59. Nonparametric methods

    If I have a sample with the size of the right and left arms of each of these people.So I have two dependent groups, since these are the same person,...

    Started by askazy‎, 12-12-2014 01:28 PM
    • Replies: 10
    • Views: 2,497
    12-16-2014, 06:30 AM Go to last post
  60. Independent T-test or ANCOVA?

    Hi everyone; Hope you're doing well!! I'm conducting a PhD dissertatind in educational research, I made a test to compare some students performance...

    Started by rukia‎, 12-25-2015 11:04 AM
    • Replies: 10
    • Views: 2,052
    01-02-2016, 09:22 AM Go to last post

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