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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: 18,662
    10-11-2014, 12:02 PM Go to last post
  1. concordance of two sets of data

    here is my problem: for a set of genes i have an expected(predicted) phenotype and an observed phenotype. i need prove that the level of...

    Started by anjan_purkayastha‎, 10-13-2008 12:29 PM
    • Replies: 0
    • Views: 3,353
    10-13-2008, 12:29 PM Go to last post
  2. Conditional Accuracy Functions

    Based on a previous study about reaction time as a proxy for attentional constraint, we are analyzing our data using conditional accuracy functions....

    Started by EnviroEve‎, 10-18-2013 12:46 PM
    • Replies: 0
    • Views: 1,211
    10-18-2013, 12:46 PM Go to last post
  3. Conditional distribution for covariance matrix with constraint

    Hi, I'm trying to work out how to draw from the conditional distribution for a covariance matrix given some correlated multivariate Gaussian data....

    Started by graeme‎, 08-11-2014 10:41 PM
    • Replies: 2
    • Views: 1,630
    08-12-2014, 11:16 AM Go to last post
  4. Conditional expectation

    Hi everyone, I've usually seen the conditional mean of X_n given X_1,X_2,….X_n-1 expressed as shown on p. 5 of: ...

    Started by CLP_PS‎, 06-06-2014 02:07 PM
    • Replies: 5
    • Views: 2,506
    06-10-2014, 12:37 AM Go to last post
  5. Confidence interval and P-value

    Hello Guy’s thanks for your help in advance I am working on a research paper. I have large set of data (50,000) which allow me to use normal...

    Started by zqkal‎, 02-06-2012 02:32 PM
    • Replies: 3
    • Views: 2,295
    02-08-2012, 11:48 AM Go to last post
  6. Confidence interval for (Xbar-2*Ybar)

    Hi, Can any body help me to calculate confidence intervals for (Xbar-2*Ybar), where X and Y are two random variables. Is this as simple as (Xbar -...

    Started by ramakrishna‎, 06-13-2012 10:54 AM
    • Replies: 2
    • Views: 2,299
    06-13-2012, 11:06 AM Go to last post
  7. 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: 8,126
    06-24-2009, 02:32 PM Go to last post
  8. Confidence interval for N, based on binomial

    Hi all, I've searched the web and these forums but couldn't find a subject that resembled my problem. If I missed something then I'd like to...

    Started by farmer_jim‎, 07-14-2014 03:59 AM
    • Replies: 0
    • Views: 1,285
    07-14-2014, 03:59 AM Go to last post
  9. confidence interval for the median(Wilcoxon)

    Hello.I have a project with subject the confidence interval for the median(Wilcoxon) and i can't find any information.I would appreciate it if...

    Started by alexandros‎, 06-16-2014 02:35 PM
    • Replies: 0
    • Views: 1,217
    06-16-2014, 02:35 PM Go to last post
  10. confidence interval GREGG estimator

    i have estimated different proportions based on a sample survey. The estimation is done with the GREGG estimator(because of problem with nonrespone)....

    Started by martinf‎, 11-05-2010 09:01 AM
    • Replies: 0
    • Views: 1,628
    11-05-2010, 09:01 AM Go to last post
  11. Confidence Interval Question

    Let Y_n be the nth order statistic of a random sample of size n from a distribution that has pdf f(x) = (3x^2)/(t^3) with 0<x<t. a) Show that P(c...

    Started by BrownianMan‎, 11-14-2011 05:49 PM
    • Replies: 0
    • Views: 1,733
    11-14-2011, 05:49 PM Go to last post
  12. Question Confidence intervals and effect size for non-parametric tests help

    Hi I am currently carrying out data analysis on SPSS for pre post treatment measures using non-parametric tests, the Wilcoxon signed rank test...

    Started by sineaddw‎, 03-05-2016 10:34 AM
    • Replies: 1
    • Views: 1,443
    03-05-2016, 10:13 PM Go to last post
  13. Confidence Intervals in a research paper

    Hi, all. I'm writing a paper on concussion data from the NFL Surveillance System, and I want to be able to put the data analysis from the journal...

    Started by leafonthewind‎, 03-23-2016 01:13 PM
    confidence intervals, independent events, p value, research article
    • Replies: 3
    • Views: 3,284
    03-24-2016, 07:42 AM Go to last post
  14. Confidence intervals in population-based study?

    Hello everyone, I have a question that might be quite simple. I'm planning a population-based study with very basic statistical analyses (mostly...

    Started by ehi895‎, 11-01-2015 07:32 AM
    • Replies: 1
    • Views: 1,613
    11-09-2015, 11:56 AM Go to last post
  15. Confidence intervals vs. Standard error bars

    I came across this article discussing the topic of confidence intervals and error bars ib plots and thought I'd share: ...

    Started by trinker‎, 11-30-2013 08:22 PM
    confidence interval, standard error bar
    • Replies: 2
    • Views: 2,054
    11-30-2013, 11:46 PM Go to last post
  16. Poll Poll: Confidence Intervals: Closed or Open Intervals

    I want to pose a question, mainly theoretical in nature, but applied responses are more than welcome. First, I'll define some terms. An interval...

    Started by ondansetron‎, 10-05-2017 06:45 PM
    • Replies: 4
    • Views: 190
    10-10-2017, 06:26 PM Go to last post
  17. Confimation/Rejection of proposed theoretical model hypotheses?

    Hi, I have conducted a CFA using AMOS software and now at the stage where I have to confirm or reject the hypotheses addressed by my research...

    Started by deto4ka‎, 04-19-2013 02:38 PM
    • Replies: 0
    • Views: 1,292
    04-19-2013, 02:38 PM Go to last post
  18. confirmatory factor analysis

    I did confirmatory factor analysis and wanted to know which item is a high-loading item. One item is significant, but it's path coefficient is...

    Started by eunkum‎, 09-23-2013 05:42 PM
    • Replies: 0
    • Views: 1,477
    09-23-2013, 05:42 PM Go to last post
  19. Confronting two tests

    Hi A group of people have taken a test with 3 possible answers. Then they underwent therapy. Finally, the took the same test again (with the 3...

    Started by roailman‎, 12-15-2011 11:50 AM
    • Replies: 2
    • Views: 1,395
    12-15-2011, 12:19 PM Go to last post
  20. 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: 3,271
    09-13-2010, 08:34 PM Go to last post
  21. Confused: correlated groups Chi Square?

    Hi all, I have three groups: Group C is a subset of Group B which is in turn a subset of Group A. Members of Groups B and C were not randomly...

    Started by tandanus‎, 09-27-2010 06:12 PM
    • Replies: 0
    • Views: 2,538
    09-27-2010, 06:12 PM Go to last post
  22. Confused: Metropolis-Hastings, its variations and the Hastings correction ratio

    Hello everyone, Over the past few weeks I have been studying MCMC and Metropolis-Hastings algorithms. Unfortunately I am stuck and confused with...

    Started by Bekos‎, 07-19-2013 02:34 AM
    mcmc, metropolis-hastings
    • Replies: 2
    • Views: 3,282
    02-08-2016, 11:05 PM Go to last post
  23. Confusion in calculating average-strange case

    :mad:Plz find the attachment & help me in solving value of average in these strange cases. Link of my word problem is:...

    Started by parag_ca‎, 11-10-2011 06:04 AM
    • Replies: 0
    • Views: 1,246
    11-10-2011, 06:04 AM Go to last post
  24. Confusions regarding Regression, Multicollinearity and Factor Analysis

    I am currently working with a data set that contains about 26 IVs of almost all sorts of scale of measurement (binary, nominal, ordinal and interval...

    Started by Blain Waan‎, 01-16-2013 08:00 AM
    factor analysis, multicollinearity, regresion analysis
    • Replies: 2
    • Views: 3,123
    01-29-2013, 03:18 PM Go to last post
  25. 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: 5,884
    03-16-2009, 05:52 AM Go to last post
  26. Conjoint analysis - orthogonal design

    Hi I'm setting up a conjoint experiment. It will be a traditional full profile setup with 7 factors (5 factors have 2 levels, 2 factors have 3...

    Started by Frederik‎, 12-03-2010 09:46 AM
    • Replies: 0
    • Views: 5,841
    12-03-2010, 09:46 AM Go to last post
  27. Considerations for choosing the right model

    Hello, I was wondering how one chooses the right model for a classification problem. Let's say I have a binary outcome variable, and many...

    Started by NN_STAT‎, 02-13-2012 03:07 AM
    • Replies: 1
    • Views: 2,671
    02-13-2012, 09:42 AM Go to last post
  28. Considering Skewness and Kurtosis

    Hello All, With test data the parameters were created for mean, standard deviation and the two other moments. I then take look at samples one at...

    Started by mike121‎, 06-05-2016 12:40 AM
    • Replies: 0
    • Views: 1,631
    06-05-2016, 12:40 AM Go to last post
  29. Consistency in statistical tests

    Hiya, this is quite a basic question. I'm testing whether administration of a drug causes an increase in 7 different dependent variables. So my...

    Started by hrj21‎, 06-13-2012 08:53 AM
    • Replies: 1
    • Views: 4,034
    06-22-2012, 02:47 PM Go to last post
  30. Constant such that correlation is zero

    Suppose that we four random variables, A, B, C, D that have the same standard deviation. Here, A, B, C, and D are chosen randomly and independently...

    Started by penguin770727‎, 01-13-2017 01:17 AM
    • Replies: 0
    • Views: 1,857
    01-13-2017, 01:17 AM Go to last post
  31. Constructing Latin Squares?

    I've come across some blurbs online about how to create or arrange latin squares which are complete, or quasi-complete. However the examples...

    Started by op1‎, 10-24-2010 02:53 PM
    • Replies: 1
    • Views: 1,632
    10-25-2010, 06:54 PM Go to last post
  32. Constucting ARMA realizations

    Given estimates for the AR and MA coefficients for an ARMA(p,q) model with a non zero mean, how do I construct a realization of the time series? ...

    Started by devlynn167‎, 06-11-2008 10:26 AM
    • Replies: 0
    • Views: 2,875
    06-11-2008, 10:26 AM Go to last post
  33. contingency table

    I'm trying to perform a sample size calculation for a 2x3 contingency table, comparing the mortality rate (expressed as proportion), between three...

    Started by amtdys‎, 12-17-2013 12:22 AM
    • Replies: 0
    • Views: 1,873
    12-17-2013, 12:22 AM Go to last post
  34. Contingency tables with an expected value of 0

    Hi all. I would like to compare two contingency tables (expected and observed). Unfortunately, one of my expectancy cells is 0, which rules out a...

    Started by DanaSchneiderDJS‎, 03-18-2011 09:29 PM
    • Replies: 6
    • Views: 6,989
    03-21-2011, 01:34 AM Go to last post
  35. Continuous approximation

    Hello all, I have a couple of question regarding the same topic. I have a new treatment, which I compare to a control (in Biostatistics), and...

    Started by NN_STAT‎, 08-27-2013 01:08 AM
    • Replies: 2
    • Views: 1,532
    08-27-2013, 02:48 PM Go to last post
  36. continuous random variable

    why the continuous random variable has to be given a Limit /Range? Cant we solve this random variable without a limit ? What is Continuous...

    Started by edifier‎, 06-03-2011 06:14 PM
    • Replies: 6
    • Views: 2,931
    06-06-2011, 03:43 PM Go to last post
  37. Continuous response variable and categorical predictor - what type of analysis to use

    Hi, I am dealing with data in which the IV's are not easily partitioned - participants can belong to one, two+, or none of the categories for a given...

    Started by bcrider‎, 08-16-2014 12:53 PM
    analisys, linear regression, methodology
    • Replies: 4
    • Views: 1,292
    08-16-2014, 03:44 PM Go to last post
  38. continuous/categorical IV in anova

    Hi, I understand that ANOVA assumes categorical IVs, and ANCOVA should be used if continuous IVs are included in the model. I am currently analyzing...

    Started by kk49‎, 05-21-2008 08:41 PM
    • Replies: 8
    • Views: 14,902
    05-23-2008, 08:33 AM Go to last post
  39. Contradictory Results re. Normality Tests

    Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

    Started by eoinmc‎, 04-26-2011 10:17 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 9,926
    06-13-2011, 03:43 PM Go to last post
  40. Question Control Range - Specify appropriate terminology

    The measurement of a parameter have been assigned to fall within a certain range, say 40 to 80. We call this the control range. If a measurement is...

    Started by scantor1451‎, 10-08-2014 06:30 AM
    • Replies: 0
    • Views: 1,519
    10-08-2014, 06:30 AM Go to last post
  41. Control Variable as part of the Dependent Variable - Problem? Solutions?

    Dear all, I'm currently trying to figure out the following problem: I have a dependent variable which is build as the standard deviation of six...

    Started by StatisticlyClueless‎, 03-15-2015 07:48 AM
    • Replies: 2
    • Views: 1,513
    03-19-2015, 08:36 AM Go to last post
  42. control vs exposed

    so i have 2 diffferent sample wherein the 1st sample is control and the 2nd sample is exposed to technology i.e in terms of exposure to Mobile...

    Started by chirax‎, 03-24-2014 02:32 AM
    • Replies: 0
    • Views: 1,762
    03-24-2014, 02:32 AM Go to last post
  43. Controlling for familywise error for large correlations matrix

    Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise...

    Started by BOAZ‎, 02-19-2012 05:21 PM
    correlation, false discovery rate, familywise error, type i error
    • Replies: 0
    • Views: 1,784
    02-19-2012, 05:21 PM Go to last post
  44. convenience sampling and p-values

    Dear all, I am in the middle of my research. I gathered data (via convenience sampling). I intend to run PCA/EFA and then use dimensions in logistic...

    Started by purifyz‎, 02-23-2015 03:19 PM
    convenience sampling
    • Replies: 2
    • Views: 1,264
    02-24-2015, 06:20 AM Go to last post
  45. Converge question (CLT ?)

    hi, the question is: Let X_1, X_2, ... be i.i.d. standard normal random variables. Prove that (X_1+X_2+...+X_n)\over\sqrt{n}does not converge in...

    Started by egpivo‎, 04-15-2010 05:21 AM
    • Replies: 0
    • Views: 1,651
    04-15-2010, 05:21 AM Go to last post
  46. Convergence in LLN and CLT help!

    Hi there, I am trying to figure out how convergence in law of large number and central limit theorem is affected by correlation in the random...

    Started by artzahar‎, 03-06-2015 04:29 AM
    central limit theore, law of large number, statistics
    • Replies: 1
    • Views: 1,245
    03-06-2015, 08:34 AM Go to last post
  47. Red face Convergent and Divergent Validity

    Is it possible to make a multimethod-multitrait matrix of tests with different number of items? example: Test 1 consists of 5 categories with 24...

    Started by mae‎, 03-05-2012 10:07 AM
    • Replies: 7
    • Views: 3,594
    03-06-2012, 10:30 AM Go to last post
  48. Convert SD and confidence intervals

    Hi I want to perform a meta analysis on pain outcomes. Some studies use a 0-10 scale, others 1-10, 0-100 or 1-100. I'd like to convert the...

    Started by benedsmith@hotmail.com‎, 05-12-2014 11:32 AM
    • Replies: 0
    • Views: 1,343
    05-12-2014, 11:32 AM Go to last post
  49. Converting 1 Distribution to Another

    I have a set of values ranging from .01 to 918 with n = 7368. About 3000 values are below 1 and about 150 values are greater than 100. The mean and...

    Started by zeloc‎, 03-06-2010 12:51 PM
    • Replies: 5
    • Views: 4,494
    03-26-2010, 12:50 PM Go to last post
  50. Converting Correlation to Effect Size

    Has anyone had experience of converting various indicators of effect size (students t, odds ratio, correlation etc.) to Cohen's d effect size? ...

    Started by JohnB‎, 04-27-2015 06:25 AM
    • Replies: 2
    • Views: 1,564
    04-28-2015, 04:43 AM Go to last post
  51. Converting eta squared to Cohen's d

    I need to convert eta squared effect sizes to Cohen's d. It's for a meta-analysis paper, so I don't have the original data set. Is it possible...

    Started by lk145‎, 02-16-2011 12:34 AM
    • Replies: 5
    • Views: 45,571
    03-03-2011, 09:11 PM Go to last post
  52. Converting individual scores into group scores in SPSS

    Hello all, I am using SPSS for my Master thesis and I've got a question. Hope someone is able to help me, because I'm stuck. My variables are:...

    Started by Kimsty‎, 09-23-2013 01:12 PM
    • Replies: 3
    • Views: 4,456
    09-24-2013, 02:25 PM Go to last post
  53. Correct approach to assessing correlation btn events in time domain?

    Hi Folks Firstly apologies if i have posted this in the wrong section - please feel free to advise or move as appropriate, and also apologies if I'm...

    Started by ogz‎, 11-15-2013 04:43 PM
    contingecy table, correlation, event, fourier, time
    • Replies: 2
    • Views: 1,475
    11-15-2013, 06:02 PM Go to last post
  54. Correct measure of central tendency for Skewed distribution

    Dear Talk Stats users, I am trying to solve following problem. I've got a data, which has a skewed distriubution (see attachment ) Now I can...

    Started by Namba‎, 10-30-2014 06:33 AM
    • Replies: 6
    • Views: 3,003
    10-30-2014, 11:26 AM Go to last post
  55. Correct method for determining group membership

    Hi, I am doing some research into what determines whether or not people gain an educational qualification in later life. My thought was to run...

    Started by lmsava‎, 07-20-2011 10:42 AM
    • Replies: 8
    • Views: 5,292
    07-29-2011, 07:03 AM Go to last post
  56. Correct methodology when not sure of linearity for continuous response variable

    I already posted on this, but haven't gotten an answer to my core question - which is, what type of statistical analysis should I run. I have...

    Started by bcrider‎, 08-16-2014 07:33 PM
    categorical iv, continuous dv, methodology
    • Replies: 1
    • Views: 1,199
    08-17-2014, 04:21 AM Go to last post
  57. Correct statistical test to compare multiple rates

    Hi, I am trying to determine whether the risk of dying on any one day is higher than other days for patients in hospital. I have calculated the...

    Started by CE479‎, 07-20-2016 03:38 PM
    compare risk multiple
    • Replies: 0
    • Views: 959
    07-20-2016, 03:38 PM Go to last post
  58. 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: 2,084
    10-10-2011, 03:09 AM Go to last post
  59. Correct test to use for research design

    Hi All, would like some opinions on the correct test to use for a pretty straight forward design: I want to examine how the effect of X on Y differs...

    Started by EricB‎, 09-21-2013 09:43 AM
    • Replies: 2
    • Views: 1,257
    09-21-2013, 10:49 AM Go to last post
  60. Correct Use of Chi-Square?

    Hi all, I am trying to test whether one group is significantly different from another in two different collections of data. I have seen that...

    Started by Ogtos‎, 08-14-2014 02:34 AM
    • Replies: 0
    • Views: 1,557
    08-14-2014, 02:34 AM Go to last post

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