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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: 18,803
    10-11-2014, 12:02 PM Go to last post
  1. Question on what statistics I should use

    Hello all, I have data from a survey of ex-prisoners. I want to look at the effect of victimization (victimized or not: dichotomous) on...

    Started by drforensicpsychologist‎, 08-25-2012 07:07 PM
    • Replies: 1
    • Views: 1,097
    08-27-2012, 03:49 AM Go to last post
  2. Intraclass correlations

    I am doing a study to investigate the interrater reliability of a rating scale. I solicited 100 teachers to complete a rating scale on a child and...

    Started by drgill‎, 03-21-2014 01:29 PM
    intraclass, intraclass correlation, intraclass interpretation
    • Replies: 0
    • Views: 1,331
    03-21-2014, 01:29 PM Go to last post
  3. Recognition of multiple spacial patterns

    Hello! I am looking for some nifty techniques or methods to help me gather elements of a set which are compatible with a base pattern. The set...

    Started by DrGob‎, 01-31-2016 07:42 AM
    • Replies: 0
    • Views: 1,013
    01-31-2016, 07:42 AM Go to last post
  4. Cell culture experiments - parametric testing when there are only three repeats!

    Felt this was a theoretical discussion point. My thesis includes cell culture experiments with 100,000 cells per condition repeated three times....

    Started by drgpenman‎, 09-22-2015 01:06 PM
    • Replies: 0
    • Views: 1,468
    09-22-2015, 01:06 PM Go to last post
  5. Sphericity- why does it really matter?

    Can someone help me understand how a sphericity violation is a problem in repeated measures ANOVA a little better? I assume a sphericity violation...

    Started by DrJBN‎, 04-08-2013 09:08 AM
    • Replies: 9
    • Views: 1,894
    04-16-2013, 01:40 AM Go to last post
  6. 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: 2,298
    02-26-2014, 09:29 AM Go to last post
  7. Exploratory Factor Analysis with Ordinal Data

    Hi folks, I am in the midst of absorbing as much information on exploratory factor analysis as I can. I studied this method once before but not to...

    Started by DRMORRIS‎, 06-18-2015 03:35 PM
    • Replies: 2
    • Views: 1,356
    06-19-2015, 04:10 PM Go to last post
  8. large cell counts - Fisher's Exact vs. chi2

    Hi everyone, I read a while back that chi2 was most accurate for observed cell counts of only between 5-70, but now I can't find that reference. I'm...

    Started by DrStatman‎, 06-09-2016 10:54 PM
    chi-squared, exact test
    • Replies: 2
    • Views: 982
    06-14-2016, 04:27 AM Go to last post
  9. modern methods data collection

    Please can you help me by showing some of the most advanced methods in data collection for surveys or census.I mean using technology like tablets or...

    Started by drunkenphd‎, 09-11-2014 02:59 AM
    • Replies: 0
    • Views: 1,704
    09-11-2014, 02:59 AM Go to last post
  10. Weighting by sample size/confidence intervals in regression analysis?

    Hello, I am conducting an analysis of how a gene frequency (technically allele frequency) correlates with certain ecological variables (mainly...

    Started by dtae‎, 07-24-2008 10:33 PM
    • Replies: 0
    • Views: 3,807
    07-24-2008, 10:33 PM Go to last post
  11. Post testing for the change in correlation between 2 variables over a 3rd linear variable

    I have a hypothesis that the strength of correlation between two continuous variables will decrease with higher levels of a third variable. To give...

    Started by dtae‎, 01-09-2011 02:04 PM
    continuous, correlation, interaction, regression, z-score
    • Replies: 0
    • Views: 3,365
    01-09-2011, 02:04 PM Go to last post
  12. stat treatment for yes no questions

    I'm an education student and doing a thesis on vocabulary competence of select students. I only know basic statistics. What statistical treatment is...

    Started by duckie23‎, 03-01-2009 10:02 AM
    • Replies: 2
    • Views: 9,662
    03-06-2009, 02:57 PM Go to last post
  13. Change over time

    Hi all, I am looking at patient activity for a disease and have patient numbers for 5 years (2009-2013). I have numbers for 4 different types: ...

    Started by Duggas03‎, 08-26-2016 06:03 AM
    patients, time trend
    • Replies: 2
    • Views: 812
    08-26-2016, 06:55 PM Go to last post
  14. SEM Confidence Intervals and Repeated Measures

    I'm analysing data from a repeated measures study. All of my stats tests (ANOVA and non-parametric tests where appropriate) are telling me that the...

    Started by dumdeedum‎, 07-31-2014 01:19 PM
    • Replies: 3
    • Views: 1,779
    08-03-2014, 06:43 PM Go to last post
  15. Issue with data analysis

    This has given me sleepless nights. Let's say I have a study where I want to look at the relationship between Grade Point Average and basket...

    Started by dummyvariables‎, 03-08-2012 04:18 PM
    • Replies: 2
    • Views: 2,287
    03-08-2012, 07:05 PM Go to last post
  16. Need a meaningful way to describe heavily-skewed numbers for 50 states

    Hi there, I apologize if this is an insultingly stupid question, but I managed to enroll in a political research class that involved very little...

    Started by dunnsidhe‎, 05-11-2009 04:14 PM
    • Replies: 0
    • Views: 1,620
    05-11-2009, 04:14 PM Go to last post
  17. Tolerance intervals for binomial

    I'm trying to learn more about tolerance intervals for a binomial distribution, but am struggling to find much literature about them. Does anyone...

    Started by duskstar‎, 09-30-2011 04:10 AM
    • Replies: 0
    • Views: 2,942
    09-30-2011, 04:10 AM Go to last post
  18. Question 2 independent var, 1 dependent var. What test should I use? Help wanted please!

    I desperately need some help with my research please. I am researching the effect of instruction in primary school and secondary school. My aim is...

    Started by Dutchie‎, 05-10-2011 07:17 AM
    • Replies: 0
    • Views: 1,689
    05-10-2011, 07:17 AM Go to last post
  19. Box's Test after outlier Removal

    Hello everyone, I have searched the forum and couldn't find an answer, so I figured I would start a new thread. I am running a 1-way MANOVA for...

    Started by dvtolusso‎, 08-02-2016 01:58 PM
    • Replies: 0
    • Views: 1,262
    08-02-2016, 01:58 PM Go to last post
  20. Stuggling with choosing the correct test.

    So I am analyzing data for a student outside of my department. They are looking to see the differences in exam scores between two different methods...

    Started by dvtolusso‎, 08-19-2016 02:26 PM
    • Replies: 9
    • Views: 1,929
    08-27-2016, 01:11 PM Go to last post
  21. Bayesian Variable Transformation (solve for PDF)

    Hi I'm struggling with where to start for this variable transformation problem. X~Bin(N,p) so that p(X=x) = (N choose x) * (p^x) * (1-p)^(N-x) ...

    Started by Dwaffle‎, 09-13-2011 08:59 PM
    • Replies: 2
    • Views: 2,207
    09-14-2011, 06:11 PM Go to last post
  22. Which method? Categorical data (IV) and continuous numerical data (DV)

    Thanks in advance for taking a look at my query I have been trying to get some statistical support from my local research department but I am...

    Started by dwilding‎, 06-21-2016 06:17 AM
    categorical data, kruskal-wallis, logistical regresion, one way anova, regression
    • Replies: 0
    • Views: 1,638
    06-21-2016, 06:17 AM Go to last post
  23. Question: making a positive case for "no effect"

    I have the results of a basic web-based marketing test. Visitors were randomly sent to one of several pages with a binary outcome of "sale" or "no...

    Started by dwilson‎, 10-21-2009 05:10 PM
    • Replies: 7
    • Views: 3,941
    10-26-2009, 03:23 PM Go to last post
  24. Ideal method of imputation when all variables have missing data?

    Need to impute data for a large data set - all variables except 1-2 contain missing data so multiple imputation isn't working well. Any suggestions...

    Started by dx2724‎, 02-23-2013 04:34 AM
    • Replies: 3
    • Views: 1,635
    02-23-2013, 11:52 PM Go to last post
  25. Kernel Density Estimation (KDE)

    I feel unsure as to what is the minimum number of genuine (real life) data points needed to applied the procedure and estimate the curve. Any...

    Started by dzericak‎, 01-03-2012 09:42 AM
    • Replies: 3
    • Views: 2,671
    01-03-2012, 07:08 PM Go to last post
  26. quantile regression vs. non-parametric curve fit of quantiles

    hello, i am doing some data analysis using a technique like the one pictured here:...

    Started by d^2‎, 06-23-2008 09:54 AM
    • Replies: 0
    • Views: 2,897
    06-23-2008, 09:54 AM Go to last post
  27. [R] permanova for multivariate repeat measures toxicology data set

    Hello, I would like to use a permanova to analyze my repeated measures, multivariate data set using the package vegan (adonis function) in R. I...

    Started by e2012‎, 07-12-2013 03:55 PM
    adonis, permanova, repeat measures
    • Replies: 0
    • Views: 2,949
    07-12-2013, 03:55 PM Go to last post
  28. Need help in finding historic data on real interest rate and CPI

    Hi everyone, In my research I use several financial instruments including real interest rate and real CPI. So far, I have been unable to find any...

    Started by E574‎, 05-18-2011 11:28 AM
    • Replies: 3
    • Views: 4,247
    05-21-2011, 10:01 AM Go to last post
  29. Time series: Research paper - VAR modeling

    Hi everyone, I am conducting a statistical research using VAR modeling. So my plan is to conduct a 4-variable VAR(2) on the following: 1)...

    Started by E574‎, 05-21-2011 10:09 AM
    • Replies: 0
    • Views: 3,876
    05-21-2011, 10:09 AM Go to last post
  30. income convergence why equations are wrong

    we want to see if there is income convergence when trade liberalization takes place. we use two measures. . The fi rst is the standard deviation of...

    Started by eac13‎, 11-16-2013 06:40 PM
    • Replies: 0
    • Views: 1,144
    11-16-2013, 06:40 PM Go to last post
  31. Multiple Comparisons across events with discrete probabilities?

    Been stuck on this problem for a few days. I have calculated many distributions that are all non-parametric, but appear to have trended to be...

    Started by eagb‎, 07-22-2015 10:33 AM
    discrete probability, multiple comparisions, non-parametric test
    • Replies: 0
    • Views: 1,207
    07-22-2015, 10:33 AM Go to last post
  32. Coding Data

    I am examining the relationship between employee level of education and the severity of their disciplinary offenses. I coded education...

    Started by eagle12‎, 08-24-2011 09:59 PM
    2 Pages
    1 2
    coding, correlation, data, research design
    • Replies: 21
    • Views: 5,767
    08-26-2011, 09:30 AM Go to last post
  33. Cool Statistical Analysis Plan - help!

    I'm doing a summer research project on trends of anxiety and depression. Unfortunately, my preceptor has disappeared in the meantime and I'm left to...

    Started by eaglesunrise518‎, 07-17-2012 10:13 AM
    biostatistics, chi square, linear regression, model comparison, statistical analysis
    • Replies: 0
    • Views: 1,521
    07-17-2012, 10:13 AM Go to last post
  34. Question Cronbach's alpha: Same scale, multiple scenarios... special calculation needed?

    Hi everyone, I'm working on data for my dissertation and had a question regarding Cronbach's alpha. In a pretest, I asked just over 100 subjects...

    Started by Eaners‎, 01-27-2015 10:22 PM
    cronbach's alpha, likert scale analysis, pretest
    • Replies: 6
    • Views: 1,562
    01-28-2015, 02:46 PM Go to last post
  35. Question Choosing an appropriate test: MANOVA? ANCOVA? Something else?

    I am performing a "dry run" statistical analysis on my dissertation data pretest, and I'm looking for a little guidance regarding the specific...

    Started by Eaners‎, 02-13-2015 02:50 AM
    continuous variable, interaction, statistical analysis
    • Replies: 3
    • Views: 1,719
    02-18-2015, 04:15 PM Go to last post
  36. Anova & post hoc analysis

    wrong forum

    Started by ebott‎, 11-15-2013 09:39 PM
    • Replies: 0
    • Views: 1,490
    11-15-2013, 09:39 PM Go to last post
  37. What type of test should I use?

    I am trying to determine whether being involved in an extracurricular activity has an impact on different course grades (dependent variable),...

    Started by econh‎, 11-14-2015 12:57 AM
    • Replies: 2
    • Views: 1,168
    11-14-2015, 04:39 PM Go to last post
  38. Hierarchical Linear Modeling

    I have a question about independent variables in HLM. Does it matter if they are dichotomous or continuous? Are there any advantages to dichotomizing...

    Started by ecotrone23‎, 09-04-2009 11:28 PM
    • Replies: 1
    • Views: 2,346
    12-11-2012, 07:02 PM Go to last post
  39. Estimating location of lower tail

    Say I have a sample, assumed from a Normal Distribution. I want to find a confidence interval for this parameter: L = \mu - \alpha * \sigma ...

    Started by EdddieB1985‎, 03-31-2016 12:40 AM
    confidence interval, estimation, standard error
    • Replies: 2
    • Views: 1,649
    03-31-2016, 11:58 AM Go to last post
  40. ttest for comparison of group means from pooled samples

    Hello, I have results from an experiment where a number (n=50) of biological samples were pooled together with a single measurement of chemical...

    Started by edfromdetroit‎, 06-09-2016 09:38 AM
    aggregate data, pooled samples, ttest
    • Replies: 0
    • Views: 777
    06-09-2016, 09:38 AM Go to last post
  41. 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: 5,560
    10-20-2011, 11:11 AM Go to last post
  42. 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: 5,956
    03-16-2009, 05:52 AM Go to last post
  43. 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: 2,947
    06-06-2011, 03:43 PM Go to last post
  44. Ranked data

    I asked my participants to rank 5 items as 1=least severe to 5 =most severe, now how can I analyse these data, parametric or non-parametric tests,...

    Started by edju‎, 01-15-2011 07:03 PM
    • Replies: 2
    • Views: 3,372
    01-16-2011, 02:10 PM Go to last post
  45. Question Comparing Intervention Groups for Students

    I am assigning interventions to student groups based on pre-test data (reading ability). I am using several different reading interventions. Our...

    Started by Educator7‎, 01-14-2017 11:00 AM
    • Replies: 0
    • Views: 2,394
    01-14-2017, 11:00 AM Go to last post
  46. 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: 2,853
    01-01-2011, 02:20 PM Go to last post
  47. Question Identifying relevant predictors and interactions

    I have a data set comprising of 12,000 observations and 1,100 potential predictors (continuous and nominal) for a binary outcome/target variable. ...

    Started by Edwin_C‎, 11-23-2015 05:57 AM
    feature selection, statistical analysis, statistical research
    • Replies: 0
    • Views: 877
    11-23-2015, 05:57 AM Go to last post
  48. How well a few values fit a given distribution?

    Dear all, I have approximated two one-dimensional random variables A and B using Gaussian Mixture Models (3 gaussians). I used...

    Started by eelioss‎, 10-24-2014 09:28 AM
    • Replies: 1
    • Views: 2,362
    10-28-2014, 04:56 AM Go to last post
  49. Trouble interpreting Fairlie's Decomposition Method in Stata

    Hi all, I am having trouble interpreting the fairlie decomposition method in Stata. I am interested in applying the procedure in identifying...

    Started by eemrun‎, 06-09-2012 10:06 AM
    • Replies: 1
    • Views: 5,198
    07-16-2012, 04:35 AM Go to last post
  50. Randomized controlled trial sample size calculation

    Well I just realized this is definitely in the wrong forum can someone please delete this thread? I can't seem to find an option for that myself.. ...

    Started by efficientfuel‎, 07-16-2014 02:14 PM
    • Replies: 1
    • Views: 2,208
    07-17-2014, 01:17 PM Go to last post
  51. Transition matrix of a Markov chain with a given limiting distrubuti

    I want to create a transition matrix P (e.g. 4x4) for a stationary Markov chain with a given limiting distribution p, but I want P to bear as much...

    Started by efl86‎, 01-08-2010 12:41 PM
    • Replies: 1
    • Views: 4,273
    04-08-2010, 08:44 PM Go to last post
  52. how to find the UMVUE of the location parameter under t distribution

    f(x;\theta)={{\Gamma({{v+1}\over2})}\over{\Gamma({v\over2})\sqrt{\pi v}}}\Big(1+\frac{(x-\theta)^2}{v}\Big)^{-\frac{v+1}{2}} , v>=3 i have no...

    Started by egpivo‎, 04-03-2010 01:10 AM
    • Replies: 7
    • Views: 6,007
    04-04-2010, 09:05 AM Go to last post
  53. How to prove the UMVUE under these conditions

    Hi everyone, the question is Let \mathbb{U} be the set of all unbiased estimators of 0. Namely, \mathbb{U}={U(X):...

    Started by egpivo‎, 04-05-2010 07:54 AM
    • Replies: 3
    • Views: 3,272
    04-06-2010, 12:00 PM Go to last post
  54. 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: 1,671
    04-15-2010, 05:21 AM Go to last post
  55. Correlation/Regression using Aggregrated Data

    Hi, This is something that I've been wondering about for some time now, but which I've never managed to find a formal reference for....

    Started by EH11‎, 10-30-2008 07:44 AM
    • Replies: 0
    • Views: 3,219
    10-30-2008, 07:44 AM Go to last post
  56. Finding relationship between 2 curves over time

    Hi guys, Awesome forum! My question does not look too complicated, but around my research centre here nobody knows what to do with my problem......

    Started by ehestigoni‎, 03-08-2009 05:49 PM
    • Replies: 1
    • Views: 3,790
    03-11-2009, 05:40 PM Go to last post
  57. 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: 1,658
    11-09-2015, 11:56 AM Go to last post
  58. How do I report marginal means of a two-way unrelated ANOVA correctly? APA-style

    Hello, after doing a two-way unrelated ANOVA (General Linear Model > Univariate) on SPSS, I am confused how to report the output correctly. My...

    Started by ein8horn‎, 08-21-2011 05:46 PM
    anova, apa, marginal, means, report
    • Replies: 0
    • Views: 6,555
    08-21-2011, 05:46 PM Go to last post
  59. Need help to combine two indeces

    Hi, I am currently writing my thesis on professionalized political Twitter profiles, and I have created two indeces to measure...

    Started by EirinK‎, 07-07-2015 05:11 AM
    • Replies: 0
    • Views: 1,355
    07-07-2015, 05:11 AM Go to last post
  60. Anova without intercept?

    Is it possible to perform Anova without an intercept? In the software, there is an option to check the box that says “no intercept”. Once I do...

    Started by elad83‎, 10-31-2016 01:55 PM
    anova, anova intercept
    • Replies: 3
    • Views: 3,573
    10-31-2016, 03:02 PM Go to last post

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