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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. Choosing a model for categorical data

    Hi all, I'm not very familiar with working with categorical data. I would like to model a categorical response variable (nominal, three levels) as a...

    Started by Heidi Swanson‎, 03-09-2010 05:20 PM
    • Replies: 2
    • Views: 2,633
    03-17-2010, 03:59 PM Go to last post
  2. Choosing a proper statistical test

    Hi! I want to perform a statistical test, but I'm not sure which one I should use. Please note that this is a hypothetical example so I will not...

    Started by grandpa‎, 04-26-2012 07:28 AM
    • Replies: 1
    • Views: 1,493
    04-26-2012, 03:22 PM Go to last post
  3. 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: 4,056
    09-13-2011, 01:28 PM Go to last post
  4. Unhappy Choosing an appropriate Statistical Test

    Hi All, I'm new here - just wanted to ask you which statistical test I could use for the following case (thanks in advance!): Information: ...

    Started by uzymedphys‎, 08-14-2010 03:39 AM
    • Replies: 3
    • Views: 3,570
    12-06-2010, 11:36 PM Go to last post
  5. 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: 1,703
    02-18-2015, 04:15 PM Go to last post
  6. Choosing bachelor's thesis topic

    Hello everyone. I am going to make research on statistics/data analysis for my bachelor's thesis. What are the popular areas of research in...

    Started by nail-uwec‎, 11-19-2016 09:49 AM
    • Replies: 0
    • Views: 3,053
    11-19-2016, 09:49 AM Go to last post
  7. choosing basic test: logistic regression or multiple chi square?

    -------------------------------------------------------------------------------- Hi, I'm new to statistics and am working on a project for...

    Started by Chris Webber‎, 06-22-2009 10:41 AM
    • Replies: 0
    • Views: 3,561
    06-22-2009, 10:41 AM Go to last post
  8. Choosing Kruskal–Wallis test for group comparison with unequal sizes

    I'm doing a survey that first seeks to identify the motivation types of university ESL students. My advisory committee added a comparison among...

    Started by btomatoe‎, 10-31-2012 01:14 AM
    • Replies: 2
    • Views: 28,048
    10-31-2012, 08:10 PM Go to last post
  9. Choosing prior for beta and normal random variables

    Hi, I need to choose 1) a prior distribution for the mean and variance of a normal random variable. 2) a prior distribution for the shape...

    Started by panbalag‎, 01-14-2011 10:18 AM
    • Replies: 1
    • Views: 3,523
    01-14-2011, 10:31 AM Go to last post
  10. Choosing right ANOVA & how to input data

    Hi, Need help with an issue. I'm not quite sure how to input the data I've collected and I'm guessing I should use ANOVA RM, but not 100% sure...

    Started by Conxile‎, 04-24-2014 02:56 PM
    • Replies: 0
    • Views: 820
    04-24-2014, 02:56 PM Go to last post
  11. Choosing Statistical Tests for a Study

    I am designing a study and I am trying to figure out what statistical tests I will need to run. I haven't taken stats in a few years, and my...

    Started by mariejolene‎, 03-22-2011 12:09 AM
    • Replies: 8
    • Views: 5,242
    03-28-2011, 11:41 PM Go to last post
  12. Choosing test for dependent anonymous sample comparisons

    I have data collected each year from 2010-2015. In this data I have demographic information and a self-reported score on a 5 pt Likert scale. The...

    Started by LCart‎, 10-08-2015 07:24 AM
    comparing means, dependent samples, statistical analysis
    • Replies: 0
    • Views: 1,035
    10-08-2015, 07:24 AM Go to last post
  13. Question Choosing the best combination

    I am conducting a research where I am trying to separate heart and lung sounds using wavelet analysis. In this research I have to use different...

    Started by xerox01‎, 04-22-2014 12:56 AM
    • Replies: 0
    • Views: 805
    04-22-2014, 12:56 AM Go to last post
  14. Choosing the correct analysis

    Hi everyone, Really needing help with choosing the right analysis for my variables. Background: I'm looking at the difference in amplitude...

    Started by meeks‎, 09-06-2017 12:37 AM
    analysis, anova, categorical, continuous, variables
    • Replies: 1
    • Views: 433
    09-06-2017, 08:35 AM Go to last post
  15. CI to percentage change in ICC

    I'm running fixed effects models to estimate changes in intra class correlations. I first run an unconditional model and then a second model...

    Started by joca7790‎, 08-31-2017 02:16 PM
    confidence interval, fixed effect model, icc, longitudinal analysis, multi-level analysis
    • Replies: 0
    • Views: 207
    08-31-2017, 02:16 PM Go to last post
  16. Citation needed for removing 3 Stdev outliers

    Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

    Started by civiloscar‎, 07-30-2012 02:21 PM
    citation, outliers, standard deviation
    • Replies: 3
    • Views: 2,690
    07-30-2012, 04:51 PM Go to last post
  17. clasiffy - weka

    can I use cfs setset evaluator /greedy stepwise for correlated? Which attributes seem to be most linked to the class attribute? how do understand...

    Started by raju1‎, 03-12-2017 04:33 PM
    • Replies: 0
    • Views: 928
    03-12-2017, 04:33 PM Go to last post
  18. Class interval identification problems!

    My data is transport cost (in percent) of 60 companies I decide to divide it into 5 classes (very good, good, moderate, poor, very poor) as the...

    Started by satha13‎, 06-24-2012 06:11 AM
    • Replies: 0
    • Views: 1,508
    06-24-2012, 06:11 AM Go to last post
  19. Classification

    Perhaps you can help me with a problem? I have a file which after a simple model classification which gives very lumpy results. ...

    Started by sverre.ardo@gmail.com‎, 09-29-2011 03:35 AM
    • Replies: 2
    • Views: 2,080
    10-07-2011, 10:43 AM Go to last post
  20. Classification of patients based on continuous variable

    Dear TS users, I have got data on a group of patients and the amount of protein they consume. I want to classify the patients as malnourished or...

    Started by ledzep‎, 12-18-2011 05:35 PM
    • Replies: 9
    • Views: 2,130
    12-19-2011, 02:47 AM Go to last post
  21. Talking Clinical Trial - sample size for statistically comparable data?

    Hi Everyone In a nutshell - I am looking to undertake an 8 week clinical trial of an equine veterinary health product. I am wanting to analyse...

    Started by WildlifeStats‎, 03-29-2016 05:25 AM
    clinical trial, placebo, sample size, sample size calculation, sample size determination
    • Replies: 1
    • Views: 775
    03-29-2016, 08:03 AM Go to last post
  22. Cluster analysis

    Hi all! I am new here, and I need some help. I have done some cluster analysis (K-means), and got four groups, two of which are "high" and "low"....

    Started by Calliope‎, 11-04-2011 10:08 AM
    • Replies: 5
    • Views: 2,089
    11-12-2011, 10:34 AM Go to last post
  23. Cluster analysis - using statistiXL package for excel - how to determine a cluster

    Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

    Started by frans‎, 03-29-2013 09:42 AM
    cluster analysis, statistical test
    • Replies: 2
    • Views: 2,107
    04-08-2013, 06:33 PM Go to last post
  24. Cluster analysis or factor analysis?

    I'm trying to decide which route to proceed for a project I am working on, any input is appreciated. Data: 228 by 10,000 matrix. 114 subjects'...

    Started by agp‎, 02-08-2013 09:25 PM
    • Replies: 1
    • Views: 1,338
    02-09-2013, 12:34 AM Go to last post
  25. Cluster analysis vs multicolinearity

    Hi you all, I hope you can help me with this following problem: 1. I've runned an factor analysis on my data for fifteen "need" items for sugar...

    Started by Tom Meulders‎, 10-17-2011 06:40 AM
    cluster analysis, data reduction, mahalanobis, multicollinearity
    • Replies: 0
    • Views: 3,375
    10-17-2011, 06:40 AM Go to last post
  26. Clustered Standard Errors vs. Multilevel Logit Model--Which one to use

    I'm working on a project with 233 observations from school districts in 10 states. Observations vary from between 3 and 108 observations per state. ...

    Started by mkobren‎, 11-18-2013 11:02 AM
    clusters, hlm, multicollinearity, multilevel
    • Replies: 0
    • Views: 1,855
    11-18-2013, 11:02 AM Go to last post
  27. Clustering Analysis when to stop the algorithm?

    I have a data set, let's assume 1,000 points, that I am attempting to form into clusters. I am using Hierarchical clustering in the sense that I...

    Started by wwreith‎, 03-24-2011 08:29 AM
    clustering, variance
    • Replies: 0
    • Views: 1,891
    03-24-2011, 08:29 AM Go to last post
  28. Clusters - Help!!!!!

    Hi unfortunately my stats abilities fall well short of solving this problem properly (it is over 20 years since I finished my Chemical Engineering...

    Started by murfinp‎, 08-20-2008 04:45 AM
    • Replies: 1
    • Views: 2,346
    08-21-2008, 01:23 PM Go to last post
  29. 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: 5,678
    08-26-2011, 09:30 AM Go to last post
  30. Coding Group Equivalency on Pre-Treatment Measures for Meta-Analysis?

    Hello- I am constructing a code book for a meta-analysis. I only want to include evaluations where program and comparison groups were reasonably...

    Started by yellowhair03‎, 09-27-2015 11:41 PM
    meta analysis, meta-analysis, meta-regression, standard deviation, statistical research
    • Replies: 0
    • Views: 726
    09-27-2015, 11:41 PM Go to last post
  31. 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: 9,271
    08-19-2008, 10:32 PM Go to last post
  32. Cohort

    Hi everyone Is sent my research proposal to ethic committee, the study design is prospective cohort. I got a reply that i should change my study...

    Started by dockiss‎, 11-16-2011 09:51 AM
    • Replies: 4
    • Views: 3,039
    11-18-2011, 01:04 PM Go to last post
  33. Cointegration and Correlation

    Hello, Based on real data (e.g. spot and futures prices of an index) if two series are correlated in the long run (e.g. strong positive...

    Started by zarasandreas‎, 11-08-2011 07:02 AM
    • Replies: 0
    • Views: 2,054
    11-08-2011, 07:02 AM Go to last post
  34. Colculation Geometric Brownian Motion with deposits.

    Hi all. There is a way of colculation a future standart diviation of a portfolio if you know the daily standart diviation and the mean. ...

    Started by borislivs‎, 12-20-2014 03:00 PM
    • Replies: 1
    • Views: 1,708
    12-20-2014, 04:15 PM Go to last post
  35. Combing Posterior Probability

    Does anyone know any methods that are used to combine two posterior probability obtained from different classifiers ?

    Started by poovich‎, 06-14-2012 01:06 AM
    • Replies: 1
    • Views: 1,628
    06-14-2012, 01:09 AM Go to last post
  36. Combining outcome scores: standardising case and control data

    Hi tehre, I have 2 separate tasks that I ask a group of individuals to complete, half the group are given a drug after the baseline measure is...

    Started by JG28‎, 09-05-2010 08:02 PM
    • Replies: 0
    • Views: 3,833
    09-05-2010, 08:02 PM Go to last post
  37. combining results obtained from 3 different methods

    Hello, I have received data tables where 3 methods have been used on 54 different variables. Method 1 (M1): multivariate model of logistic...

    Started by cukymonster‎, 08-12-2013 06:23 PM
    cutoff, method comparison, ranking, results integration
    • Replies: 0
    • Views: 1,272
    08-12-2013, 06:23 PM Go to last post
  38. Wink Combining samples for EFA

    Hello, I have conducted an experiment in two different countries. The experiment included a survey. The same survey was used. Is it valid to...

    Started by mazendanaf‎, 07-01-2013 07:20 AM
    combining, factor analysis, surveys
    • Replies: 1
    • Views: 771
    07-08-2013, 03:25 AM Go to last post
  39. Exclamation Combining two samples to then do Cluster Analysis/multivariate analysis

    I was wondering if someone can help. For a university assignment I have been asked to propose a marketing research method & survey etc for a...

    Started by student123‎, 05-03-2015 04:25 PM
    analysis, cluster, combined sampling, quota sampling, stratified sampling
    • Replies: 0
    • Views: 986
    05-03-2015, 04:25 PM Go to last post
  40. Combining Variables to Fill Missing Data

    Summary of Problem: 1. I want to combine three similar variables to fill severe missing data problem. Significance of problem: 1. My data is...

    Started by williamsons‎, 12-02-2010 05:19 AM
    • Replies: 0
    • Views: 3,018
    12-02-2010, 05:19 AM Go to last post
  41. combining weighted p-values across multiple studies

    Hello, I am not someone who is extremely familiar with statistical theory so I have had to do a lot of reading to arrive at these ideas. I am...

    Started by cukymonster‎, 05-05-2013 10:24 PM
    • Replies: 0
    • Views: 1,402
    05-05-2013, 10:24 PM Go to last post
  42. Common method variance

    Hi, I am analysing a self reporting survey. From the survey is designed to look at 12 constructs. Each of these constructs have either 1,2,3...

    Started by john_cappa‎, 03-01-2011 10:43 AM
    • Replies: 2
    • Views: 3,801
    03-03-2011, 08:52 PM Go to last post
  43. compare a non ranked list to a ranked list

    Hi, I need to compare a small list of genes (genes of interests) to a big ranked list of genes (9000) where the 1st one is shown to have an effect...

    Started by noirobscure‎, 02-18-2014 03:03 PM
    • Replies: 2
    • Views: 870
    02-24-2014, 11:09 AM Go to last post
  44. Compare type of procedure with an outcome - which analysis is best?

    Good morning, I'm writing a medical meta-analysis, and I need help with a part of the statistical analysis. I gathered articles from various...

    Started by giuly_gt‎, 11-05-2014 08:55 AM
    • Replies: 0
    • Views: 1,610
    11-05-2014, 08:55 AM 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: 7,602
    10-19-2009, 01:17 AM Go to last post
  46. Comparing 2 groups of means ! shoud I use letters ?

    Hello, I hope everyone is doing well ! when comparing groups of means in a table, usually we express the differences in terms of letters next to...

    Started by expressomar‎, 07-06-2014 10:15 AM
    letters, means, probability
    • Replies: 0
    • Views: 1,399
    07-06-2014, 10:15 AM Go to last post
  47. Smile Comparing 2 Likert scale with different scale numbers

    One of my surveys has a Likert scale of 1-7. The other survey that I am comparing it too has a scale of 0-5. My study is a correlation study, but I...

    Started by jillyoung‎, 07-18-2008 01:04 PM
    • Replies: 0
    • Views: 9,663
    07-18-2008, 01:04 PM Go to last post
  48. Comparing 3D points/surfaces statistically.

    Hello. I'm performing two-at-a-time analysis on simulation data, plotting the output metric (Z axis) for each combination of two parameters (X,Y...

    Started by atreide‎, 08-18-2013 02:31 PM
    • Replies: 3
    • Views: 2,344
    08-20-2013, 04:56 AM Go to last post
  49. Comparing activity budgets, before and after

    Hi all, I am a beginner, so I hope my question is not too stupid. I want to compare activity budgets of animals before and after an event. I...

    Started by Johanna_MonkeyStats‎, 09-08-2011 12:48 PM
    • Replies: 3
    • Views: 3,261
    02-08-2012, 03:05 PM Go to last post
  50. Comparing an ecological subsample to population

    I have 2 batches of tree species and abundance data collected for a city. The difference between them is the sampling strategy - one was random...

    Started by andyspeak‎, 06-23-2017 08:22 AM
    braycurtis, ecology, population, sampling
    • Replies: 1
    • Views: 513
    06-26-2017, 06:01 PM Go to last post
  51. Comparing categorical and numerical results simultaneously

    Hi all, This question is in regards to options for analysing a dataset. I have a dataset where we have 23 video clips that have been treated using...

    Started by Sicyopterus‎, 08-27-2015 12:17 AM
    ecology, statistical analysis, statistical design
    • Replies: 0
    • Views: 1,160
    08-27-2015, 12:17 AM Go to last post
  52. Comparing categorical data for a relationship - alternatives to a chi-square test?

    Hi Everyone, This is my first post here, and I am very new to statistical testing, so I'm going to try to make this question as clear as possible...

    Started by paulmccarney‎, 07-31-2014 12:42 PM
    categorical data analysis, chi-square, post hoc tests
    • Replies: 0
    • Views: 954
    07-31-2014, 12:42 PM Go to last post
  53. Comparing categorical data with 2 independent variables

    Hi All, I'm a student researcher and am needing some statistical advice. I stumbled upon a post regarding a similar problem at this site, so I'll...

    Started by f344‎, 05-22-2012 09:12 AM
    • Replies: 0
    • Views: 1,402
    05-22-2012, 09:12 AM Go to last post
  54. Comparing confidence intervals: CI of mean vs CI of regression coefficient

    Hi, I have longitudinal data with measurements at two timepoints. I am interested in the change per year and calculated this in two ways: *...

    Started by confusedscientist‎, 06-22-2012 08:28 AM
    confidence interval, linear regression
    • Replies: 0
    • Views: 1,830
    06-22-2012, 08:28 AM Go to last post
  55. Comparing Correlation's Effect Size, Significance between Two Populations

    Hi, All! I have variables describing students (N=340), both boys (N=160) and girls (N=180). I calculated Pearson's correlation (using SPSS) for...

    Started by jonesh‎, 11-21-2011 10:45 PM
    • Replies: 2
    • Views: 2,256
    11-22-2011, 08:13 AM Go to last post
  56. 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
  57. Comparing deaths with reportings

    Hi. For my dissertation I am looking at how "Superbugs" are represented in the Media, and how the media's portrayal of them has caused some...

    Started by dellmarie88‎, 02-21-2009 02:10 PM
    • Replies: 0
    • Views: 1,961
    02-21-2009, 02:10 PM Go to last post
  58. comparing directions on the sphere

    Hello everyone, I am trying to compare two directions on the unit sphere, given two estimated mean directions a and b and their covariance...

    Started by LauraMuffin‎, 03-29-2010 03:05 AM
    • Replies: 0
    • Views: 1,745
    03-29-2010, 03:05 AM Go to last post
  59. 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: 3,927
    05-21-2012, 10:28 AM Go to last post
  60. Comparing Improvement Between Groups - Best Approach?

    Perhaps this is an easy issue, but I wanted to throw it out anyway. I'm working on a dataset where there are two groups, both having pre- and...

    Started by Barnzilla‎, 11-28-2008 09:58 AM
    • Replies: 3
    • Views: 4,031
    01-14-2009, 10:27 PM Go to last post

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