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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: 18,796
    10-11-2014, 12:02 PM Go to last post
  1. Comparing ind. and dep. significance help!

    I'm working right now on a political science research paper and it's fairly involved in statistical analysis and I need some help and clarification....

    Started by burton160w‎, 12-06-2010 01:01 AM
    • Replies: 5
    • Views: 4,187
    12-08-2010, 12:24 AM Go to last post
  2. 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
  3. Comparing likelihood ratios:please help!!!

    Hi to all. I desperately need a method to compare positive and negative likelihood ratios of a diagnostic test within two strata (e.g. likelihood...

    Started by George76‎, 07-13-2009 07:20 PM
    • Replies: 0
    • Views: 2,832
    07-13-2009, 07:20 PM Go to last post
  4. Comparing Likert items. What test should I use?

    Hi, We ran a small survey study (n=50) with questions on perceived value of a tool we've developed. (the participants filled in the survey after...

    Started by RDW‎, 01-23-2015 09:09 AM
    • Replies: 3
    • Views: 1,748
    01-24-2015, 07:59 AM Go to last post
  5. Comparing Mean and Median

    Hello people. I'm currently doing a research on household income and expenditure in my country, and I'm faced with some problems: 1. Are mean and...

    Started by ZimZim‎, 08-24-2013 08:02 AM
    • Replies: 2
    • Views: 2,229
    08-24-2013, 05:52 PM Go to last post
  6. comparing means

    Hi All, I need a bit of help. I have attached a spreadsheet containing data that I need to analyze. There are two groups - 1 and 2. Each group has...

    Started by jarod347‎, 11-20-2013 12:39 PM
    • Replies: 2
    • Views: 1,733
    12-02-2013, 02:34 PM Go to last post
  7. comparing means

    Hi All, I would like to ask a question about compare mean to answer the research question. i have 2 scales to measure anxiety situation, first...

    Started by ghada8888‎, 01-18-2014 09:50 AM
    • Replies: 0
    • Views: 1,842
    01-18-2014, 09:50 AM Go to last post
  8. Comparing means from SAME sample

    I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

    Started by HumanParticipantResearch‎, 09-01-2010 01:35 PM
    • Replies: 0
    • Views: 3,685
    09-01-2010, 01:35 PM Go to last post
  9. comparing means\unequal(small) size group

    Hi, I am about to use student t test to compare the mean of two independent groups. The first group sample size is 4 and another one is 24. Can I...

    Started by apahliani‎, 08-16-2009 03:51 PM
    • Replies: 4
    • Views: 26,416
    08-18-2009, 12:00 AM Go to last post
  10. Comparing model fits across groups

    Hi all, I have an experiment involving two groups of individuals who receive different treatments, and there are two non-linear models I wish to...

    Started by timothyv‎, 05-30-2013 03:19 PM
    • Replies: 0
    • Views: 1,221
    05-30-2013, 03:19 PM Go to last post
  11. comparing models

    This might be a "101" question but hey, The Ecologist" encouraged me to ask questions , lots and lots of stupid questions. So when I have two...

    Started by bugman‎, 08-21-2015 12:14 AM
    • Replies: 7
    • Views: 2,357
    12-04-2015, 10:26 PM Go to last post
  12. comparing multiple means between multiple groups

    Hi Everyone, Pretty new to stats and want to make sure that I am running the right stats. I have means (measured in months) from multiple...

    Started by chiccaboom‎, 08-30-2016 12:28 PM
    statistical test
    • Replies: 0
    • Views: 764
    08-30-2016, 12:28 PM Go to last post
  13. Comparing non hyper-rectangular design space to uniform distribution

    Second post here, another out there question... Does anyone know how to compare a design space point distribution to a uniform distribution, if...

    Started by TSGarp007‎, 07-08-2013 08:36 AM
    • Replies: 0
    • Views: 1,217
    07-08-2013, 08:36 AM Go to last post
  14. Wink Comparing overall mean rankings - help?

    Hi there, I am wondering how I can compare overall ranking means, which I have seen in a previous study. They manage to conduct a chi-square...

    Started by samohsam‎, 07-30-2014 04:26 AM
    • Replies: 0
    • Views: 1,061
    07-30-2014, 04:26 AM Go to last post
  15. Comparing overdispersion distributions

    I am dealing with handling overdispersed count data(Poisson distributions fails to fit). I need to compare three different mixtures of Poisson...

    Started by arun‎, 09-14-2012 08:28 AM
    • Replies: 0
    • Views: 1,446
    09-14-2012, 08:28 AM Go to last post
  16. Cool comparing percentage when without knowing n? what test?

    I'm trying to do a meta analysis of some poll results and though I know the sample size in general, if I'm comparing the reported results and they...

    Started by rokkid‎, 07-25-2011 10:51 AM
    comparing percentages, missing data, proportions
    • Replies: 2
    • Views: 1,715
    07-25-2011, 06:15 PM Go to last post
  17. Comparing pretest and posttest measures of intervention group with control

    Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

    Started by Jannez‎, 02-14-2012 05:27 AM
    • Replies: 3
    • Views: 4,412
    02-27-2012, 12:05 PM Go to last post
  18. Comparing Proportions with difference numbers of events

    So, I'm interested in examining prey preference of a predator and one of the metrics I am interested in rejection rates for attack. I have 1 hour...

    Started by nebulus‎, 09-21-2016 04:54 PM
    • Replies: 0
    • Views: 1,854
    09-21-2016, 04:54 PM Go to last post
  19. Comparing responses on 5-point scale

    Hi All, I have administered a 5-point scale on my participants which they answered on 10 value items- can I assume this is interval data? I have...

    Started by JB89‎, 04-04-2012 01:32 PM
    • Replies: 3
    • Views: 2,438
    04-05-2012, 03:26 AM Go to last post
  20. Comparing ROC curves

    Do you have to have the raw data a ROC curve is generated from to tell if they are signficantly different, or can you use the results such as the C...

    Started by noetsi‎, 06-26-2013 01:51 PM
    • Replies: 0
    • Views: 1,690
    06-26-2013, 01:51 PM Go to last post
  21. comparing section in a scale using spss

    Hi everyone; hope you are doing well, I am actually conducting a research, and I am comparing between a pre and post scale. my problem is that...

    Started by rukia‎, 03-24-2017 07:54 AM
    • Replies: 4
    • Views: 1,491
    04-02-2017, 09:55 PM Go to last post
  22. comparing simulated and experimental data

    Hi All, I generated a time series data by simulation (each condition has been generated time condition1 condition2 condition3 .... ...

    Started by Rman‎, 08-04-2014 03:08 PM
    compare groups, correlation, experimental, simulated_data
    • Replies: 0
    • Views: 1,286
    08-04-2014, 03:08 PM Go to last post
  23. Comparing standard deviations

    Hi, I have data about incomes from two groups and I want to see which group's variance is bigger. The two groups income is measured in the...

    Started by Jeremy1‎, 11-13-2013 10:06 AM
    • Replies: 1
    • Views: 2,171
    11-13-2013, 11:27 AM Go to last post
  24. Comparing subsets of data from the same population?

    I'm hoping someone can help me conceptualize my question better because I have a feeling I'm looking at it the wrong way. I'm looking at a number of...

    Started by sosaysi‎, 03-19-2015 04:16 PM
    • Replies: 0
    • Views: 1,326
    03-19-2015, 04:16 PM Go to last post
  25. 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: 325
    06-26-2017, 05:11 AM Go to last post
  26. Comparing the mean of top and bottom quartiles

    Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

    Started by lolozgor‎, 02-08-2012 12:26 AM
    quartile, t-test
    • Replies: 2
    • Views: 3,942
    02-08-2012, 12:45 AM Go to last post
  27. Comparing the mean of two non-random groups

    Students are assigned to group A or B based on two aspects: a grade from an exam and an evaluation of their teacher. Students with both a high grade...

    Started by f3000‎, 11-10-2013 07:46 AM
    • Replies: 1
    • Views: 1,838
    11-30-2013, 10:59 AM Go to last post
  28. Comparing the output of JAGS to conjugate analysis - normal with unknown mean and var

    Dear Bayesians. I'm starting my way in the Bayesian world, and I'm trying to build a simple model for estimating the mean and variance of a normal...

    Started by idif‎, 09-20-2016 09:02 AM
    bayesian, conjugate, jags, mcmc
    • Replies: 0
    • Views: 1,065
    09-20-2016, 09:02 AM Go to last post
  29. Comparing three groups that have been analysed by Friedman's ANOVA

    Dear all, I have been struggling with the following problem and would be extremely grateful for some help. :confused: I have three groups of...

    Started by Tulip‎, 02-29-2012 04:04 AM
    friedman's anova, mixed-design, non-parametric
    • Replies: 0
    • Views: 2,912
    02-29-2012, 04:04 AM Go to last post
  30. Comparing time curves for two groups in research.

    Hello, I am creating time curves (experimentally) for two groups of mice (f(t) and y(t)): number of particular cells (in murine blood, per ml of...

    Started by bondsergey‎, 07-25-2014 08:27 AM
    statistical research
    • Replies: 3
    • Views: 1,743
    07-25-2014, 11:45 AM Go to last post
  31. comparing two charts

    Hi, i am new in forum and i am an amateur in Statistics. I have two data sets of the same thing and i want to compare them. For example i have 20...

    Started by stathi02‎, 05-06-2009 11:12 AM
    • Replies: 3
    • Views: 2,864
    05-06-2009, 05:20 PM Go to last post
  32. Comparing two datasets in terms of anonymisation

    Hi guys, hope you are doing good! I have quite the conundrum; I'm trying to figure out different ways I can cross-examine two datasets (D1 and...

    Started by jbwettergreen‎, 09-13-2016 03:07 AM
    • Replies: 0
    • Views: 1,429
    09-13-2016, 03:07 AM Go to last post
  33. Comparing two distributions using random drawing.

    Hi all, So this is going to be a bit of a silly question: but one i've been pondering for ages. So say i've used a t-test and found two groups...

    Started by ThomasAG‎, 03-07-2010 03:59 PM
    • Replies: 7
    • Views: 3,947
    09-18-2011, 08:11 AM Go to last post
  34. Comparing two groups - best test to use?

    Hi all, I have two sets of data - hospital admission lengths (measured in whole hours) grouped in to 'younger patients' and 'older patients'....

    Started by AbnormallyDistributed‎, 08-29-2016 10:48 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 4,301
    09-06-2016, 03:43 PM Go to last post
  35. Comparing two groups on multiple DVs

    Hi all! I'm hoping for some help with reviewer comments on a paper. I'm a grad student in behavioural neuroscience, with some stats courses under...

    Started by Amisa‎, 09-25-2011 01:08 AM
    alternative to bonferroni, multiple comparisons, t-tests
    • Replies: 4
    • Views: 2,516
    09-25-2011, 05:08 PM Go to last post
  36. Comparing two groups responses to a 5 question likert questionnaire

    I'm analyzing a likert questionnaire to determine if respondent's answered questions differently based on whether they compete frequently or...

    Started by aduray‎, 05-21-2012 09:34 PM
    • Replies: 5
    • Views: 4,477
    05-21-2012, 11:08 PM Go to last post
  37. comparing two measurements over time

    I'm designing an experiment with two condition. Cond A with no manipulation of the independent var and ConB with manipulation of the independent var....

    Started by dirkheld‎, 08-22-2007 07:11 AM
    • Replies: 8
    • Views: 7,837
    08-27-2007, 04:38 AM Go to last post
  38. Comparing two overlapping samples in a tracking study

    I have a quick query about measures of sample accuracy in a tracking study with an overlapping (common) sample, and couldn't see anything here...

    Started by batfastard‎, 05-14-2012 01:19 AM
    comparing two samples
    • Replies: 0
    • Views: 1,378
    05-14-2012, 01:19 AM Go to last post
  39. Comparing two variable datasets

    Hello, I would like to see if two 2-dimentional datasets are the same, my data consists of two groups of xy data - the data is not linearly...

    Started by bjj‎, 01-13-2017 02:25 PM
    • Replies: 0
    • Views: 2,401
    01-13-2017, 02:25 PM Go to last post
  40. Comparing within groups and across conditions

    Hi, I am not sure if anyone can help me, i have undertaken a large physiological study for my post grad, it is looking at stress hormones within...

    Started by sifry37‎, 03-14-2011 05:35 PM
    • Replies: 0
    • Views: 3,272
    03-14-2011, 05:35 PM Go to last post
  41. Question Comparison between two joint probability distributions

    I have two bivariate tables with variables "Birth Order" (with birth order 2, 3, 4 and 5) on one side and "Birth Interval" (with intervals 10-15,...

    Started by Sambit‎, 03-12-2013 05:24 AM
    • Replies: 0
    • Views: 2,253
    03-12-2013, 05:24 AM Go to last post
  42. Question comparison for 2 independent groups , t test or ANOVA

    What test should i use for a comparison between two independent groups of N=30. Also if a questionnaire is made with only 2 answers like yes or no...

    Started by shesaishi‎, 06-14-2013 04:28 PM
    anova, comparison, t test
    • Replies: 7
    • Views: 2,531
    06-15-2013, 07:47 AM Go to last post
  43. Comparison of 20 serum chemistry analytes of reptile blood at time 0 and time 1 hour

    Dear All, I am having troubles in analyzing results of one study: I want to evaluate the effect of time (1 hour) on 20 analytes (e.g. pH, BUN,...

    Started by nicoladiggi‎, 08-30-2012 12:42 PM
    • Replies: 3
    • Views: 1,703
    08-30-2012, 06:09 PM Go to last post
  44. 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: 3,693
    05-29-2012, 07:07 AM Go to last post
  45. Comparison of Revenue Variances

    I'm a non statistical type who needs help to determine the right model to test the following scenario: I have ten stores that are all alike, in...

    Started by amg123‎, 12-20-2012 01:16 PM
    • Replies: 0
    • Views: 1,796
    12-20-2012, 01:16 PM Go to last post
  46. Comparison of the cohen's ds of 2 independent studies

    Hello, Is it possible to statistically compare the cohen's d of two studies in order to determine of one of the two Cohen's d is statistically...

    Started by will74lsn‎, 11-21-2013 12:48 PM
    cohen's d
    • Replies: 2
    • Views: 1,621
    11-22-2013, 05:41 AM Go to last post
  47. Comparison of the power of the tests: Parametric test versus Non-parametric test

    How can one compare using a simple experimentation or simulation whether a parametric test (e.g. t-test) is more powerful than its non-parametric...

    Started by imjae2‎, 08-26-2012 11:09 AM
    monte carlo, non-parametric test, parametric, simulation, statistical power
    • Replies: 6
    • Views: 4,779
    08-26-2012, 04:23 PM Go to last post
  48. Comparison of time series

    Hi there, firstly I would like to say that I'm newbie here, so hi everyone, and please be patient if I do something wrong. And sorry for my level...

    Started by nofuj‎, 09-13-2010 01:35 AM
    • Replies: 2
    • Views: 9,374
    09-17-2010, 11:58 AM Go to last post
  49. Question Comparison of time series nested in Repeated Measures Design

    Post deleted cause it garnered no responses on this forum....

    Started by karan85‎, 04-30-2015 11:30 AM
    • Replies: 0
    • Views: 1,683
    04-30-2015, 11:30 AM Go to last post
  50. Comparison of two treatments (paired and unpaired)

    Hi all! I'm working on my Master thesis and need to make sure I'm not doing it wrong. My research: Are answers to questions a and b...

    Started by atisketatasket‎, 07-19-2014 03:02 AM
    comparison, distribution, sample, survey, treatments
    • Replies: 0
    • Views: 1,097
    07-19-2014, 03:02 AM Go to last post
  51. Comparison quantity with mean values and measurement uncertainty

    Hi !! I need help in a problem. I measured a quantity Q from the area A of a peak (normally distributed) divide by two factors. The uncertainty...

    Started by zana‎, 08-30-2014 10:47 AM
    anova, measurement
    • Replies: 0
    • Views: 1,513
    08-30-2014, 10:47 AM Go to last post
  52. Complementary log log

    Hi I have a model with a binomial error distribution. Instead of the logit link I use the complementary log log. What is the interpretation of...

    Started by hen666‎, 02-12-2009 01:24 PM
    • Replies: 1
    • Views: 4,783
    02-12-2009, 04:09 PM Go to last post
  53. Composite Hypothesis Testing Problem

    Hello guys, So I have this problem I am trying to solve and its

    Started by glorean‎, 05-10-2015 04:48 PM
    inference, statistics
    • Replies: 0
    • Views: 964
    05-10-2015, 04:48 PM Go to last post
  54. Composite Scores - Approaches to Missing Data

    I have some data from an assessment form that has 25 items, all on a 5-point scale. What I'm looking at is the sum of these items. For a few...

    Started by Barnzilla‎, 11-20-2008 10:49 AM
    • Replies: 6
    • Views: 6,635
    12-12-2008, 09:43 AM Go to last post
  55. composite variables

    Dear users, I have a question regarding the calculation of a composite variable out of 5 individual variables which I want to use in a MANOVA...

    Started by DonJ‎, 05-03-2014 12:02 PM
    • Replies: 1
    • Views: 1,220
    05-03-2014, 03:55 PM Go to last post
  56. Compound poisson gamma model and biomass data

    I have some biomass data (total count -discrete- of individuals and total dry weight -continuous-) that I would like to model with environmental...

    Started by Nono75‎, 06-07-2016 09:26 AM
    data analysis, modeling techniques
    • Replies: 1
    • Views: 1,522
    06-07-2016, 01:12 PM Go to last post
  57. Compute a new variable or is there a better way to do this?

    First post, thanks in advance for advice. I would like to examine three variables, with the expectation that: When a subject scores HIGH on...

    Started by vexedpsych‎, 03-26-2013 03:25 PM
    • Replies: 2
    • Views: 1,622
    03-26-2013, 04:07 PM Go to last post
  58. Compute an optimization stress from size distribution density and abundance

    Hi everyone, Here's the shortest version of this optimization problem: - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -...

    Started by Iago-lito‎, 06-23-2014 04:56 AM
    abundance, distribution density, optimization, simulation, stress
    • Replies: 0
    • Views: 1,295
    06-23-2014, 04:56 AM Go to last post
  59. compute true values monte carlo simulation

    Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

    Started by alex76‎, 06-10-2010 03:34 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,771
    07-04-2010, 05:19 AM Go to last post
  60. Computing ICCs

    Hi everyone, Have run into a problem that has me absolutely stumped and would appreciate some assistance. I'm attempting to compute the ICC from...

    Started by jnian‎, 06-29-2015 03:36 PM
    • Replies: 0
    • Views: 876
    06-29-2015, 03:36 PM Go to last post

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