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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: 18,669
    10-11-2014, 12:02 PM Go to last post
  1. Paper Survey for (Statistical) Function Modelling

    Hi! I'm surveying some papers for different kinds of approaches for (statistical) function modelling. Suppose (x_1,...,x_n) is one of multiple...

    Started by VincentJYTsai‎, 10-19-2016 09:38 AM
    • Replies: 0
    • Views: 1,888
    10-19-2016, 09:38 AM Go to last post
  2. 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: 6,386
    10-12-2010, 10:20 PM Go to last post
  3. Bayesian Logistic Regression

    I have the following logistic regression problem I am trying to solve using bayesian approach. " We consider a logistic regression setting where...

    Started by vioravis‎, 10-13-2008 03:09 PM
    • Replies: 0
    • Views: 3,137
    10-13-2008, 03:09 PM Go to last post
  4. Divergent results - RMANOVA vs. paired samples t-tests

    Hi there, I'm analyzing a dataset (a pre - post intervention), where I have a baseline and 2 post-intervention time points. If I perform a RMANOVA...

    Started by Virconrui‎, 05-15-2012 08:50 AM
    paired samples t-test, repeated measures anova
    • Replies: 0
    • Views: 2,050
    05-15-2012, 08:50 AM Go to last post
  5. Smile Two independent, non-metric categorical variables: which test to use?

    :)Hello! I am new to this forum so first I would like to say hi to everybody and already thank you in advance for your kindness to help me on my...

    Started by Virenque‎, 07-19-2011 03:34 AM
    • Replies: 2
    • Views: 12,243
    07-19-2011, 08:50 AM Go to last post
  6. metropolis algorithm for ising model

    Hi i'm looking for some help with trying to understand how to use the metropolis algorithm for the 2D ising model. In the problem i am trying to...

    Started by vitaniarain‎, 11-19-2010 06:34 AM
    • Replies: 0
    • Views: 3,022
    11-19-2010, 06:34 AM Go to last post
  7. Question Report effect size?

    Hi, I am new to this forum and my knowledge about statistic is pretty basic. So beforehand I thank you for your help. In my research I used non...

    Started by vitorio‎, 09-14-2015 12:29 PM
    effect size, research
    • Replies: 0
    • Views: 1,594
    09-14-2015, 12:29 PM Go to last post
  8. Test to compare difference between median value in two discrete samples

    Hi, I have two collection of ordinal samples for a discrete variable related to two administration of an experiment. Using Kolmogorov-Smirnov, I...

    Started by Vito_Mangh‎, 01-22-2015 10:59 AM
    discrete vc comparison, inference, mann-whitney test, test hypothesis, wilcoxon rank sum test
    • Replies: 1
    • Views: 1,455
    01-22-2015, 11:20 AM Go to last post
  9. repeated cross sectional-partially changed study population

    I have a large dataset (n=11804) that includes data from a cross sectional study conducted in 2013, 2014 and 2015 in patients in nursing homes...so...

    Started by Viv92‎, 09-09-2016 03:33 AM
    analysis, drop outs, repeated cross sectional
    • Replies: 0
    • Views: 648
    09-09-2016, 03:33 AM Go to last post
  10. Deriving meaningful information from a set.

    Hello all, I was working for my statistics class and kind of extrapolated a problem. I think sharing this with this forum will help in coming...

    Started by vivek_12315‎, 01-23-2011 02:05 PM
    mining, stats
    • Replies: 5
    • Views: 2,814
    01-23-2011, 04:22 PM Go to last post
  11. Smile research question

    easy (stupid?) question. for a small project, i had to write a research hypothesis and null hypothesis research hypothesis. the research...

    Started by vivident‎, 06-23-2012 05:18 PM
    • Replies: 1
    • Views: 1,401
    07-02-2012, 08:53 AM Go to last post
  12. The effect of a single continuous IV on within subjects change

    Could someone please suggest the most appropriate method of analysis to examine the effect of a continuous IV on a within subject (repeated measures)...

    Started by vivienf‎, 10-20-2016 08:33 PM
    change, mixed anova, repeated measure, within-subjects
    • Replies: 0
    • Views: 2,037
    10-20-2016, 08:33 PM Go to last post
  13. Meta-analyses

    Hi following you, is there a minimum of paper / study / publication to write a meta-analyse ??? Do you know something to evaluate a meta-analyse...

    Started by viwel‎, 04-21-2009 09:15 AM
    • Replies: 0
    • Views: 2,093
    04-21-2009, 09:15 AM Go to last post
  14. Current Commentary Study

    Hi what is it a Current commentary study ??? What does it mean ??? Regards

    Started by viwel‎, 04-28-2009 07:05 AM
    • Replies: 2
    • Views: 2,871
    04-30-2009, 07:52 AM Go to last post
  15. Applying parametric tests on non-parametric data

    Hi all, I'm doing a research and I have some concerns, and I'd appreciate your kind assistance on them. Basically, I'm designing an instrument...

    Started by vjyofudp‎, 08-31-2015 10:11 AM
    • Replies: 1
    • Views: 1,435
    08-31-2015, 01:21 PM Go to last post
  16. Power and Alpha combinations for same sample size

    Let's say I have a sample size established with alpha=0.05 and power=0.8 (based on time constraint for study). So, the same sample size can be...

    Started by vladmalik‎, 09-20-2014 12:20 AM
    power alpha sample size
    • Replies: 2
    • Views: 1,635
    09-22-2014, 09:27 PM Go to last post
  17. Latin Hypercube sampling with correlations

    Hello! I am trying to generate a 9-dimensional Latin Hypercube sample (1000 draws or so) where each dimension variable is normally distributed...

    Started by Vlob‎, 07-07-2010 02:57 AM
    • Replies: 0
    • Views: 3,228
    07-07-2010, 02:57 AM Go to last post
  18. Data clustering, error and closness formula lemma

    I need to know how error and closeness formulas, attached in file are formed or what is the significance of these formulas?

    Started by vnv2004‎, 09-01-2013 11:51 AM
    • Replies: 0
    • Views: 1,432
    09-01-2013, 11:51 AM Go to last post
  19. maximizing probability that one variable is greater than another

    hi, There is a random variable X with a known distribution along its support interval, say, . Need to find a distribution function of another...

    Started by Vova‎, 07-28-2015 06:58 AM
    • Replies: 2
    • Views: 1,694
    07-29-2015, 07:18 AM Go to last post
  20. How to deal with unknown distribution?

    I have a game with two players. Player 1's type is publicly known, while player 2's type is unknown (privately known to him) and distributed, say,...

    Started by Vova‎, 11-24-2016 03:31 PM
    • Replies: 0
    • Views: 3,303
    11-24-2016, 03:31 PM Go to last post
  21. Question about Statistics Application to C=0 Zero Acceptance Number Sampling Plan

    My company is using the following sampling table based on Nicholas Sequigla's Zero Acceptance Number Sampling Plan: ...

    Started by vphan27‎, 11-14-2011 06:29 PM
    • Replies: 0
    • Views: 2,828
    11-14-2011, 06:29 PM Go to last post
  22. 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: 3,216
    10-03-2011, 04:32 PM Go to last post
  23. Are nodes connecting each other random?

    Given a network composed of ten nodes and 20 symmetric ties, how to calculate the probability of displaying one or more cliques (nodes connecting...

    Started by watashi‎, 08-31-2012 11:16 PM
    • Replies: 0
    • Views: 1,444
    08-31-2012, 11:16 PM Go to last post
  24. Question accounting for volunteers giving a survey

    When writing about validity/ reliability, how do I take into account volunteers who have given the treatment to the participants rather than myself...

    Started by watasnake‎, 05-29-2013 07:36 PM
    reliability, validity, volunteers
    • Replies: 0
    • Views: 997
    05-29-2013, 07:36 PM Go to last post
  25. [Multinomial Distribution] Help with applying Multinomial to a biological problem

    Hello all, I need help with a stats question I'm trying to solve for a biological question. http://en.wikipedia.org/wiki/Multinomial_distribution....

    Started by Wayne314‎, 08-12-2013 11:39 AM
    biology, cancer, multinomial, research question
    • Replies: 1
    • Views: 1,408
    08-12-2013, 11:49 AM Go to last post
  26. The joint normality of the two estimates for linear regression model

    I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

    Started by waynetang‎, 12-21-2012 12:46 PM
    • Replies: 13
    • Views: 3,093
    12-22-2012, 12:27 PM Go to last post
  27. Ordinal Regression vs Spearmans Rank Correlation

    Hello, My name is William, I am currently at my last year at Newcastle University, UK carrying out research for my dissertation on how social...

    Started by wberner11‎, 04-01-2015 05:45 AM
    dissertation, regression analysis, spearmans rank
    • Replies: 3
    • Views: 2,717
    04-01-2015, 06:44 AM Go to last post
  28. Logistic or OLS Regression?

    I am new to statistics and learning a bit about regression and logistic "regression." The dependent variable for my data set is whether a sports...

    Started by WC4J‎, 06-10-2015 11:36 AM
    • Replies: 3
    • Views: 1,421
    06-11-2015, 09:07 AM Go to last post
  29. advice on how to proceed

    Hello, I recently undertook to analyze a relatively simple data set. It includes estimates of tree species composition for several sites within...

    Started by wdmn‎, 11-07-2015 12:11 AM
    • Replies: 5
    • Views: 1,813
    11-10-2015, 12:37 PM Go to last post
  30. structural zeros and chi square

    Hello, I have been reading a little bit about structural zeros and chi-square goodness of fit tests. I've not been able to find a clear answer...

    Started by wdmn‎, 12-05-2015 02:08 PM
    • Replies: 2
    • Views: 2,785
    12-05-2015, 03:48 PM Go to last post
  31. Partial Least Squares

    Hello, I am doing a project about "Partial Least Squares", and I find it a bit hard to understand the math part of the model. I was wondering if...

    Started by WeeG‎, 05-24-2008 11:20 AM
    • Replies: 0
    • Views: 2,859
    05-24-2008, 11:20 AM Go to last post
  32. Longitudinal Data Analysis

    Hello people, I need some help with LDA, I have important home work to do and I have a problem. I got autocorrelation of a model: (obs=70) ...

    Started by WeeG‎, 07-28-2008 05:28 AM
    • Replies: 0
    • Views: 2,945
    07-28-2008, 05:28 AM Go to last post
  33. Isotonic Regression

    Hello, I would like to ask if someone knows the answers to the next questions: 1. When do I use Isotonic Regression and why ? 2. What's the...

    Started by WeeG‎, 03-20-2009 04:19 PM
    • Replies: 0
    • Views: 3,125
    03-20-2009, 04:19 PM Go to last post
  34. Central Limit Theorem

    Hi guys, According to the central limit theorem, if I have a sample of n independent variables X1,....Xn, from ANY distribution, the sample mean...

    Started by WeeG‎, 05-03-2010 02:20 AM
    • Replies: 1
    • Views: 3,238
    05-03-2010, 06:51 AM Go to last post
  35. sufficient statistic

    Hi guys, I have a little question. I got a density function: f(x)=exp{-(x-\theta)} when \theta<X<infinity I need to find a sufficient...

    Started by WeeG‎, 06-02-2010 11:51 AM
    • Replies: 1
    • Views: 3,984
    06-02-2010, 11:59 AM Go to last post
  36. 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: 3,280
    06-10-2010, 01:17 PM Go to last post
  37. 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: 5,318
    06-09-2010, 02:09 PM Go to last post
  38. When do we use...

    just out of curiosity.... where is Mathematical Statistics, if at all, do we use modern algebra (i.e Groups, Rings,....) ?

    Started by WeeG‎, 09-11-2010 09:23 AM
    • Replies: 3
    • Views: 2,343
    09-11-2010, 10:33 AM Go to last post
  39. Pca

    Hi guys, There is something basic I don't understand about PCA, maybe you can explain it to me in simple words. After getting the components...

    Started by WeeG‎, 05-01-2011 04:02 AM
    • Replies: 0
    • Views: 1,921
    05-01-2011, 04:02 AM Go to last post
  40. Two sample tests

    Hello, I am looking for differences in continuous variables between two groups: Healthy people and ill people. I have a sample of around 20 ill...

    Started by WeeG‎, 07-23-2011 07:37 AM
    • Replies: 3
    • Views: 1,845
    07-24-2011, 02:48 PM Go to last post
  41. Mixed models in SPSS -- swapping predictor and predicted?

    Hi, I'm working on a project where I have repeated measures of a (continuous) IV and DV. At each measurement "time" I would like to predict the...

    Started by weiaijiayou‎, 11-07-2011 01:22 AM
    mixed models, spss
    • Replies: 5
    • Views: 3,335
    11-10-2011, 05:29 PM Go to last post
  42. mean+standard deviation+skewness+kurtosis

    hi I want to order some variables according to (mean+standard deviation+skewness+kurtosis) or some new rule considering mean value, standard...

    Started by WEIBO‎, 03-06-2015 05:51 AM
    kurtosis, skewness
    • Replies: 8
    • Views: 2,459
    03-06-2015, 02:25 PM Go to last post
  43. Sloppy financial stats

    I'm looking for a rough estimate of the probability that an annual increase in a market price will be less than i) 50% and ii) 70% (on any given...

    Started by welt‎, 02-16-2013 09:56 PM
    • Replies: 1
    • Views: 1,061
    02-18-2013, 04:39 AM Go to last post
  44. Comparing Data from Value-Based Scales with Frequency-Based Scales

    I was recently asked to correlate scores between two surveys that supposedly measure similar constructs. One has a value-based scale (very like me,...

    Started by Wendell‎, 01-22-2014 02:36 PM
    correlation analysis, likert, scales, validation
    • Replies: 0
    • Views: 1,463
    01-22-2014, 02:36 PM Go to last post
  45. Multiple testing?

    Hi all, I have a question about some analyses that I did. I examined a large hospital admissions data set and the data were grouped by areas 1, 2,...

    Started by wernie07‎, 12-17-2015 03:07 PM
    • Replies: 7
    • Views: 1,666
    12-18-2015, 10:54 AM Go to last post
  46. What's the null hypothesis here.

    I need to do a hypothesis test on the mean of bicycle hire lengths in London, the expectation is that the mean hire shouldn't exceed 60 minutes. ...

    Started by Wevans2303‎, 03-21-2012 11:30 AM
    • Replies: 5
    • Views: 2,855
    03-21-2012, 02:30 PM Go to last post
  47. Data collection???

    First off apologies if I should have just posted this in my other thread. I am working with some cycle hire data from the Barclays Bicycle Hire...

    Started by Wevans2303‎, 03-22-2012 07:04 PM
    • Replies: 2
    • Views: 1,472
    03-22-2012, 07:52 PM Go to last post
  48. 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: 3,197
    07-05-2011, 12:27 PM Go to last post
  49. comparison of Exponential distribution and Lognormal Distribution parameters

    Hi everyone! I have 30 days worth of data. Each day, I have a set of interarrival times. I wanted to find out the distribution of the arrivals, so...

    Started by whattodo‎, 05-29-2012 07:07 AM
    • Replies: 0
    • Views: 3,629
    05-29-2012, 07:07 AM Go to last post
  50. How do I define this research design?

    This is a fairly straightforward question but I can't seem to find a good definition to categorize some review board paperwork I need to do. ...

    Started by Whitcoatsyndrom247‎, 04-22-2014 03:49 PM
    • Replies: 1
    • Views: 1,004
    04-22-2014, 08:52 PM Go to last post
  51. How to combine correlated vector-valued estimates

    I'd like to combine several vector-valued estimates of a physical quantity in order to obtain a better estimate with less uncertainty. As in the...

    Started by WhiteHaired‎, 03-21-2017 05:50 AM
    combine estimates, correlated estimates, uncertainty propagation, vector-valued estimates, weighted mean
    • Replies: 1
    • Views: 1,341
    03-21-2017, 03:03 PM Go to last post
  52. Sample Size Calculater based on a Known Population Size

    Hello all, Part of the research objectives is to achieve generalisation of the findings and extend it to the rest of organisation. To do so, I...

    Started by wickedChecky‎, 07-31-2012 03:43 PM
    • Replies: 0
    • Views: 2,845
    07-31-2012, 03:43 PM Go to last post
  53. Lightbulb Which analysis fits this research?

    Hi everyone! Apparently, evertbody in the forum seems to have quite some knowledge already, while I am only posting a rather easy questoin. I...

    Started by Wiebke.90‎, 05-07-2014 03:05 AM
    • Replies: 0
    • Views: 1,139
    05-07-2014, 03:05 AM Go to last post
  54. Generalized Estimation Equations

    Dear all, I have a data set with three independent variables and one dependent variables. Two independent variables are factors with several...

    Started by Wilbert‎, 08-23-2013 04:01 AM
    • Replies: 0
    • Views: 996
    08-23-2013, 04:01 AM Go to last post
  55. mixed effect models / influential observations

    Hello, I understood that influential observations should be excluded in the analysis when doing a mixed effect analysis. What is the best way to...

    Started by Wilbert‎, 08-27-2013 04:48 PM
    • Replies: 2
    • Views: 1,423
    08-28-2013, 08:31 AM Go to last post
  56. mixed effect analysis / (adjusted) R square

    Hello, I've a data set with two random variables (subject and item), three independent variables (three factors and one covariate). I want to...

    Started by Wilbert‎, 08-27-2013 04:53 PM
    • Replies: 2
    • Views: 1,863
    08-28-2013, 08:24 AM Go to last post
  57. mixed models and residual plots

    Hi all, As far as I know, the assumptions of linearity and homoskedasticity are tested by consulting the residual plots. I have several models,...

    Started by Wilbert‎, 09-23-2013 08:32 AM
    • Replies: 0
    • Views: 1,079
    09-23-2013, 08:32 AM Go to last post
  58. Ancova

    Hello, For an ANCOVA the scores for each group (defined by the levels of the factors) should be normally distributed. Does this apply for the...

    Started by Wilbert‎, 08-31-2013 01:02 PM
    • Replies: 3
    • Views: 1,308
    09-03-2013, 05:08 AM Go to last post
  59. R-square and mixed models

    What is the best way to calculate the R-square of a linear mixed model? May first guess would be to correlate the predicted values with the observed...

    Started by Wilbert‎, 09-03-2013 06:33 AM
    • Replies: 3
    • Views: 3,538
    09-05-2013, 04:38 AM Go to last post
  60. comparing test results obtained on the basis of different sample sizes

    I have variables a1 and a2 with 57 observations each, and variables b1 and b2 with 29 observations each. I compare a1 with a2 by means of a...

    Started by Wilbert‎, 06-26-2017 05:11 AM
    effect size, sample sizes, t-test
    • Replies: 0
    • Views: 302
    06-26-2017, 05:11 AM Go to last post

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