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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: 18,617
    10-11-2014, 12:02 PM Go to last post
  1. Mixture analyses using Akaike Information Criterion

    Hi guys, Just wondered if you could shed some light on interpreting results of a mixture analyses using Akaike Information Criterion. I am trying...

    Started by Sam-sasquatch‎, 08-08-2013 10:51 AM
    • Replies: 1
    • Views: 1,939
    08-10-2013, 11:31 AM Go to last post
  2. Question (adjusted)R-squared / eta-squared / omage-squared for ANOVA

    Dear all, When obtaining ANOVA results with SPSS we also get a R-squared and an adjusted R-squared. For a multi-way ANOVA the eta-squared is given...

    Started by Wilbert‎, 08-08-2013 05:41 AM
    anova r-squared
    • Replies: 2
    • Views: 7,218
    08-09-2013, 04:35 PM Go to last post
  3. Homogeneity assumption mixed ANOVA

    For my research I did a mixed ANOVA. The homogeneity assumption was violated. However, I learned that this is only a problem when the group sizes...

    Started by Pluzan‎, 07-20-2013 06:37 AM
    • Replies: 9
    • Views: 3,771
    08-09-2013, 12:37 PM Go to last post
  4. Permanova design for BACI study (using Primer)

    my first question here! i need to do a few analyses on a biological dataset, and I am a bit puzzled about how to set my Permanova design. I use...

    Started by doddel‎, 08-01-2013 08:25 AM
    • Replies: 5
    • Views: 3,148
    08-09-2013, 03:51 AM Go to last post
  5. Margin of error for stratified survey sample

    Hi all, first-time poster here. I have a stratified sample of respondents to a survey with the following make-up: So the total population...

    Started by speegster‎, 08-08-2013 08:17 PM
    margin of error, proportion, stratified sampling, surveys
    • Replies: 0
    • Views: 1,633
    08-08-2013, 08:17 PM Go to last post
  6. Health center level data to client level data?? posible?

    I have data for 31 centers (observations) and have the following variables of interest. Ex: IDcenter= 1 client_black=25 client_white 50...

    Started by Marvin85‎, 07-30-2013 09:23 AM
    • Replies: 8
    • Views: 1,991
    08-08-2013, 01:13 PM Go to last post
  7. Mistakes by teachers of statistics

    A while ago I came across a paper that claimed many statisticians (or maybe it was teachers of statistics in universities) did not under some basics...

    Started by longrob‎, 08-08-2013 08:00 AM
    • Replies: 0
    • Views: 1,131
    08-08-2013, 08:00 AM Go to last post
  8. interaction plot in logistic regression

    Dear All Hi I am Amir from Iran where we have no a well know psychologist especially in quantitative. I am working on a data with a dummy variable...

    Started by amirpakpour‎, 08-06-2013 07:04 PM
    • Replies: 1
    • Views: 5,317
    08-06-2013, 09:30 PM Go to last post
  9. Does my research proposal make sense? [Basic Stats]

    Hi everyone, I'm new to statistics, statistical packages and research methods in general. Yet I'm fascinated by the subject and want to learn as...

    Started by StatsScared‎, 08-06-2013 04:01 PM
    basic statistics, help me!, time-use, two-way anova
    • Replies: 2
    • Views: 2,790
    08-06-2013, 04:46 PM Go to last post
  10. Standard Deviation of averages based on uneven sample sizes--possible? alternative?

    Dataset consists of ratio of fouls to (fouls+balls in play) at count 3-0 for 346 individual baseball players over 8 years. I calculated the STD...

    Started by madyohe‎, 08-06-2013 03:10 PM
    • Replies: 0
    • Views: 1,256
    08-06-2013, 03:10 PM Go to last post
  11. Data collection

    Hi everyone, i have a simple question that i actually cant get my head around (have been working on this assignment far to long and hard!) The...

    Started by emmayo‎, 08-05-2013 11:39 PM
    • Replies: 0
    • Views: 967
    08-05-2013, 11:39 PM Go to last post
  12. Likert scale analysis - grouped items

    Good morning, I am currently analyzing a Likert scale questionnaire (5 points) of 28 items. The items of the questionnaire are grouped into...

    Started by frederiquef‎, 08-05-2013 04:02 PM
    • Replies: 0
    • Views: 1,265
    08-05-2013, 04:02 PM Go to last post
  13. transformations of random vars support set

    Hi, I understand the transformations of variables concept, getting the Jacobian and so on, but I am having trouble with defining the support...

    Started by sabina9‎, 08-05-2013 07:21 AM
    • Replies: 0
    • Views: 1,435
    08-05-2013, 07:21 AM Go to last post
  14. Skewed data - what test should I use

    Research question: Does wearing a helmet affect head repositioning error in a group of normal participants compared to not wearing a helmet? 3...

    Started by KDS‎, 08-03-2013 05:50 AM
    median test, skewed data
    • Replies: 3
    • Views: 5,692
    08-04-2013, 07:08 PM Go to last post
  15. SOS!Correct name of sampling method.

    Dear all, please help me as I have to finish my dissertation in one week and I unfortunately cannot find the correct name for the sampling method...

    Started by Copenhagen‎, 08-04-2013 01:48 PM
    • Replies: 1
    • Views: 1,325
    08-04-2013, 02:02 PM Go to last post
  16. Dissemination Research

    Hey Guys/Girls!:D Currently im in the finalizing stage of my master thesis (On gossip versus rumor dissemination on the work floor). Out of a...

    Started by Tim Pigeon‎, 08-04-2013 09:50 AM
    • Replies: 1
    • Views: 1,214
    08-04-2013, 01:44 PM Go to last post
  17. Rarefaction and species richness

    Hi all! First of all thank you to take a look to my question, I hope this is the right subforum and I hope to explain it right! I have a...

    Started by borinot‎, 08-04-2013 12:51 PM
    • Replies: 0
    • Views: 2,228
    08-04-2013, 12:51 PM Go to last post
  18. Logistic regresion with only discrete IV

    Hi, I saw a few binary logistic regressions in Minitab where we did not have any continuous variables and the analysis Minitab gave was simply the...

    Started by rogojel‎, 08-02-2013 06:48 AM
    • Replies: 5
    • Views: 3,601
    08-03-2013, 02:29 PM Go to last post
  19. Which Model of ICC to use: one way; two way mixed, or two way random?

    Hello All, I am using spss 21 My goal is to justify aggregating individual lower-level viability scores into a team higher-level viability score...

    Started by VCH‎, 08-02-2013 05:26 PM
    aggregate, anova, icc
    • Replies: 0
    • Views: 4,479
    08-02-2013, 05:26 PM Go to last post
  20. Rank Based Inverse Normal Transformations for Scales

    Hi everyone, I am trying to fix my normality distribution among a series of psychological and social science scales so that I can perform pearsons...

    Started by kbabs987‎, 08-02-2013 07:23 AM
    • Replies: 0
    • Views: 2,891
    08-02-2013, 07:23 AM Go to last post
  21. p-values : binomial vs. normal

    I've taken and tutor some basic statistics courses. What I've been taught is that to compute p-values (false positive rate) for hypothesis testing on...

    Started by lex logan‎, 07-18-2013 11:50 AM
    • Replies: 10
    • Views: 2,947
    08-01-2013, 07:28 PM Go to last post
  22. Event study on index

    Dear all, I'm conducting several event studies for my thesis. But I'm wondering if it's possible to conduct one on an index. I want to see if the...

    Started by anthonyphilippe‎, 08-01-2013 03:30 AM
    • Replies: 1
    • Views: 1,031
    08-01-2013, 03:43 AM Go to last post
  23. How to compare the convergence over time between two groups?

    Hello, My goal is to check if the convergence of the Interquartile Range (IQR) over time is significantly different between two groups. I have...

    Started by ido‎, 07-31-2013 03:10 AM
    • Replies: 0
    • Views: 1,347
    07-31-2013, 03:10 AM Go to last post
  24. Unhappy How they obtained the following results

    I need a little help, I just starting with statistics and I'm trying to figure out how the calculated result is 11.8532? Hypothesis H1 was: "There...

    Started by markecb‎, 07-30-2013 12:19 PM
    • Replies: 2
    • Views: 1,454
    07-30-2013, 02:31 PM Go to last post
  25. Multiple comparisons after Kruskal-Wallis

    Hello everyone, I have been looking for differences in attitude (dependent variable, continuous) between >2 unmatched samples (independent...

    Started by PaulB‎, 07-30-2013 09:13 AM
    • Replies: 1
    • Views: 10,555
    07-30-2013, 10:39 AM Go to last post
  26. Unhappy A little guideance needed...

    First off, I hoped I've posted in the right forum-if not sorry xx I'm working through a sample question regarding a sample of 20 sections of...

    Started by Charlie Day‎, 07-29-2013 03:58 PM
    • Replies: 3
    • Views: 1,931
    07-30-2013, 07:15 AM Go to last post
  27. Variables that are Both Predictors and Response Variables

    I have been reading about variable/feature selection algorithms. All of the algorithms that I have seen presume that there is a clear distinction...

    Started by OtagoHarbour‎, 07-29-2013 09:26 PM
    prediction, response, variable selection, variables
    • Replies: 0
    • Views: 1,434
    07-29-2013, 09:26 PM Go to last post
  28. What test to identify words used more frequently by one group than another?

    I have two groups of subjects, A and B. I have a text sample produced by each subject. My goal is to idenitfy those words that are used significantly...

    Started by 1234‎, 07-29-2013 12:53 PM
    frequency, word
    • Replies: 6
    • Views: 1,593
    07-29-2013, 03:23 PM Go to last post
  29. New to time series stats (want spikes)

    Hi, I have been out of school for a while now (BS CompSci) and I only took one Statistics class many years ago. So I'm definitely not an expert. :o...

    Started by Phy6‎, 07-20-2010 05:39 PM
    • Replies: 1
    • Views: 3,917
    07-29-2013, 04:16 AM Go to last post
  30. Analyzing a repeated experiment with only one subject

    My experimental setup is explained using a simplified analogy of what I am doing: We are dropping 40 balls into a body of water. All the balls are...

    Started by k_scheduler‎, 07-25-2013 09:43 AM
    • Replies: 0
    • Views: 1,462
    07-25-2013, 09:43 AM Go to last post
  31. Can I use regression to increase sample size of survey responders?

    I have a question about how I can extrapolate responses from a survey to apply to the entire population with a decent level of confidence and...

    Started by alebertoni‎, 07-24-2013 08:09 AM
    extrapolation, regression, sample size
    • Replies: 1
    • Views: 1,183
    07-24-2013, 05:26 PM Go to last post
  32. Mann-Whitney U failed assumption?

    Hi all, I hope you're able to help. I have some numbers that need crunching. I would normally use an independent-samples t test, however, as...

    Started by stephenstats‎, 07-24-2013 12:56 PM
    • Replies: 2
    • Views: 937
    07-24-2013, 02:50 PM Go to last post
  33. Gibbs sampler problems

    I am trying to implement the gibbs sampler found here http://www.people.fas.harvard.edu/~plam/teaching/methods/mcmc/mcmc.pdf on page 175. It is...

    Started by aminnaar‎, 07-23-2013 12:08 PM
    gibbs sampler, python
    • Replies: 1
    • Views: 1,625
    07-23-2013, 12:46 PM Go to last post
  34. Weighted Co-efficient Of Variation.

    Hey folks, I have the test scores of 9 different psychology tests taken by primary school students. 390 students gave the test. I want to categorize...

    Started by Ravishankar‎, 07-23-2013 06:30 AM
    • Replies: 0
    • Views: 2,167
    07-23-2013, 06:30 AM Go to last post
  35. level of significance 0.1%

    Hi! Would it be OK to use a level of significance of 0.1 -instead of traditional 0.05- when using non-parametric tests in bivariate analyses if...

    Started by juanpe000‎, 01-17-2011 08:10 AM
    • Replies: 9
    • Views: 24,197
    07-23-2013, 02:55 AM Go to last post
  36. Insight from statisticians needed - identifying which parameters separate data.

    Hi, I've got a dataset consisting of a few hundreds of dimensions. Each dimension has a value assigned to it at every time point. The data is...

    Started by trelek2‎, 07-21-2013 06:26 PM
    • Replies: 0
    • Views: 2,508
    07-21-2013, 06:26 PM Go to last post
  37. Slovinís Formula in Excel (Calculating Survey Sample Size)

    Hello All, If anyone can help me with an formular that has had me somewhat stumped for the last few weeks now, I would be eternally grateful ! I...

    Started by Offshore‎, 07-21-2013 09:04 AM
    • Replies: 0
    • Views: 27,054
    07-21-2013, 09:04 AM Go to last post
  38. Question ANOVA or Regression? and how to put data in SPSS in order to perform the test?

    I am doing research about recycling and want to know the relationship between recycling costs of some electronic products and the composition of...

    Started by looli12‎, 07-20-2013 09:28 PM
    anova, categorical, regression, spss
    • Replies: 0
    • Views: 1,271
    07-20-2013, 09:28 PM Go to last post
  39. t-test

    The inpatients infection rates will be tracked from the entire inpatient population on all three adult units allowing it to be compared to the rates...

    Started by eunkum‎, 07-19-2013 10:53 AM
    • Replies: 2
    • Views: 1,284
    07-19-2013, 03:56 PM Go to last post
  40. Question Help Needed: How to assess heterogeneity/diversity of values in the group?

    Dear forum members, I am trying to come up (or to find an existing one) with a measure of how many different values the group of numbers has. ...

    Started by sigmund‎, 07-19-2013 12:45 PM
    • Replies: 0
    • Views: 968
    07-19-2013, 12:45 PM Go to last post
  41. Question Are my observations independent or not?

    Hi everyone! I have an issue with my observations. I don't know if I can state they are independent or not. In my study, I have 8 different tasks...

    Started by supertoket‎, 07-16-2013 03:59 PM
    independent observations, t-test
    • Replies: 4
    • Views: 3,308
    07-18-2013, 02:33 PM Go to last post
  42. Extrapolating to a population from a sample

    Hello, I am having problems with a seemingly simple question. Here is the situation: Imagine, I grow 3 kinds of trees (A, B, C) for sale in a...

    Started by hhveluj‎, 07-12-2013 08:04 AM
    • Replies: 4
    • Views: 1,942
    07-18-2013, 02:22 PM Go to last post
  43. Joint Probability From Correlation Function

    Dear all I have the following problem. Given a set of correlated binary variables, can I determine the joint probability from the correlation...

    Started by torkel‎, 03-23-2010 12:49 PM
    • Replies: 3
    • Views: 3,772
    07-18-2013, 03:14 AM Go to last post
  44. Linear regression categorical IV Institution level data

    Hi all, I have a institution level dataset (51 health centers). We have received funds to promote the use of contraceptive methods among...

    Started by Marvin85‎, 07-15-2013 04:37 PM
    • Replies: 1
    • Views: 1,114
    07-16-2013, 12:23 PM Go to last post
  45. I have a trouble with statistics. please help me out

    I have attached my design already. I want to know that are there any different of two birds species movement among season and session? The...

    Started by gregloki‎, 07-16-2013 03:58 AM
    • Replies: 0
    • Views: 940
    07-16-2013, 03:58 AM Go to last post
  46. multivar normal distribution

    Hi, I have X, Y and Z that have N distribution and I got the E(X|Y) and E(X|Z) using the bivariate rules, but for E(X|Y,Z) I don't know how to...

    Started by sabina9‎, 07-15-2013 11:09 AM
    • Replies: 1
    • Views: 893
    07-15-2013, 11:24 AM Go to last post
  47. Moderated Mediation Macro Limitations

    Hello! I am currently working on my thesis and my data seems to fit a moderated mediation model but I'm up against some of the MODMED limitations....

    Started by syzergy‎, 07-13-2013 04:48 PM
    • Replies: 6
    • Views: 3,020
    07-13-2013, 05:43 PM Go to last post
  48. which test?

    Hi i have some data and i want to analysis them. i have 64 mouses at 8 group, i took 2 drugs to them with different tubes and doses. so i want...

    Started by hol‎, 07-13-2013 03:18 AM
    • Replies: 1
    • Views: 1,353
    07-13-2013, 06:49 AM Go to last post
  49. [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: 2,909
    07-12-2013, 03:55 PM Go to last post
  50. random effects model

    In Random Effects model, what do Qb and d indicate?

    Started by eunkum‎, 07-11-2013 03:46 PM
    • Replies: 1
    • Views: 1,009
    07-11-2013, 03:50 PM Go to last post
  51. Latent Factors and Dimensionality

    Can someone briefly explain to be the difference between factors in a latent sense and a dimensional sense? I've managed to get myself confused and I...

    Started by loops22‎, 07-10-2013 08:27 AM
    • Replies: 3
    • Views: 1,281
    07-10-2013, 11:51 AM Go to last post
  52. what statistical techniques to use?

    Hello all, I am really new to this, so please bear with me. In essence, I am looking at whether poor institutional performance encourages...

    Started by IR_STUDENT‎, 07-09-2013 07:12 PM
    • Replies: 0
    • Views: 1,317
    07-09-2013, 07:12 PM Go to last post
  53. Factor analysis, what type of data can I use?

    Hello everyone, I have a social science dataset composed of circa 40 variables. The data types I am using are quite diverse. The variables I am...

    Started by parsec2011‎, 07-02-2013 12:58 PM
    2 Pages
    1 2
    binary, likert, logistic, logit, polychoric correlation
    • Replies: 18
    • Views: 7,178
    07-08-2013, 11:38 AM Go to last post
  54. 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: 1,190
    07-08-2013, 08:36 AM Go to last post
  55. Generate Space Filling Designs with nonlinear constraints on the design space

    Hey everybody, thanks for taking the time to view my post. I was wondering if anyone knows of any software that will allow a user to create a...

    Started by TSGarp007‎, 07-08-2013 08:32 AM
    • Replies: 0
    • Views: 786
    07-08-2013, 08:32 AM Go to last post
  56. Sampling from Tweets or Tweet Users

    Dear All, We would lile to do Twitter Analysis and want to read tweets for certain topic to decide wheter they are positive,negative or neutral ....

    Started by masarimk‎, 07-04-2013 03:53 AM
    • Replies: 1
    • Views: 913
    07-08-2013, 03:33 AM Go to last post
  57. 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: 765
    07-08-2013, 03:25 AM Go to last post
  58. Lightbulb can not figure out simple question, please help

    hi everyone! I have the following question: while running univariate GLM, I have encountered the situation when mean differences between groups...

    Started by Antouanetta‎, 07-04-2013 10:36 AM
    glm, pairwise comparison, significance, spss output, univariate
    • Replies: 1
    • Views: 963
    07-08-2013, 03:22 AM Go to last post
  59. Lightbulb How to analyze my bat data...number of bats vs. distance categories..

    Hello. I have some bat data that looks a bit like this: Distance from Unit Number of bats recorder 0-10metres ...

    Started by biggerdunk‎, 07-07-2013 01:15 PM
    • Replies: 1
    • Views: 1,905
    07-07-2013, 02:54 PM Go to last post
  60. Can you estimate the power of a test by simulating data?

    I have generated 1000 samples (four groups using the sample size, mean, and standard deviation for each group for a normally distributed variable)...

    Started by Disvengeance‎, 07-05-2013 05:48 PM
    • Replies: 6
    • Views: 1,632
    07-06-2013, 06:31 PM Go to last post

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