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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: 18,747
    10-11-2014, 12:02 PM Go to last post
  1. cross-tabs or non-parametric independent sample t-test

    I have conducted a survey to determine if there is a significant difference in the number farmers and non-farmers which agree to a specific farming...

    Started by MayTrix‎, 07-23-2015 10:04 AM
    cross tabulation, non parametric
    • Replies: 7
    • Views: 1,919
    08-17-2015, 01:32 PM Go to last post
  2. T-test question

    Hi there. I have one Q need some advice on it. In my research, I have 2 national groups (British and Saudi) and I need to compare between them in...

    Started by ghada8888‎, 11-08-2012 01:24 PM
    • Replies: 7
    • Views: 1,885
    11-28-2012, 11:44 PM Go to last post
  3. Justification for Levene's test?

    Take an example where the variance of two samples is truly heterogeneous: Sample 1 weights - 100, 140, 160, 200 Sample 2 weights - 10, 14, 16, 20 ...

    Started by emily.stats‎, 11-22-2012 09:31 AM
    • Replies: 7
    • Views: 3,058
    11-28-2012, 06:27 AM Go to last post
  4. Negative Pearson r ? Absolute value?

    Help! I'm computing a Pearson Product-Moment Correlation and I get a negative r-value of -0.75. When I test for significance using a t-test, my...

    Started by Jennifer Nyman‎, 12-01-2012 06:48 PM
    • Replies: 7
    • Views: 2,622
    12-01-2012, 07:46 PM Go to last post
  5. Transforming a whole dataset

    Dear all, I would like to transform my dataset, and can not do it manually since I have to many cases. I have a dataset with the following...

    Started by Mathis‎, 12-27-2012 12:43 PM
    • Replies: 7
    • Views: 2,284
    12-29-2012, 10:11 AM Go to last post
  6. ANOVA and quadratic terms?

    Hello everyone! I have what I think is a relatively straight-forward 3-way factorial ANOVA design. One of my factors (which is "number of...

    Started by will22‎, 01-21-2013 06:38 PM
    • Replies: 7
    • Views: 4,802
    01-21-2013, 11:33 PM Go to last post
  7. Interpretation of correlation coefficient

    Hello, I am working on a meta-analysis with the program R. Here I am investigating the relationship between the dependent variable "participation...

    Started by Stat_Prob‎, 01-24-2013 08:58 AM
    correlation coefficient, fisher's z-transformed, meta-analysis, r-program
    • Replies: 7
    • Views: 1,486
    01-24-2013, 01:29 PM Go to last post
  8. transformation of inverse gamma distributed data

    Hi. I have inverse gamma distributed data (Pearson 5 distribution). I've tried some common transformation such as Ln, Lg, sqrt, LnGamma but could not...

    Started by garybooz‎, 02-27-2013 05:18 AM
    • Replies: 7
    • Views: 4,665
    02-27-2013, 08:46 PM Go to last post
  9. 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: 2,521
    06-15-2013, 07:47 AM Go to last post
  10. Significant lack of fit, invalid model?

    I am using JMP and working with percent arrival of insects (scale of 0-1). For example, out of 10 insects, 10 arrived at date X so 0.1 is that...

    Started by jhartsho‎, 05-30-2013 11:34 AM
    insects
    • Replies: 7
    • Views: 4,390
    05-30-2013, 03:20 PM Go to last post
  11. Question Best method to analyze mediation and moderation with ordinal data?

    Hello! I'm new here (and to statistics as well). I could use your advice about how to analyze the data for my master thesis. The first part of...

    Started by delyangrozdev‎, 05-24-2013 04:32 AM
    • Replies: 7
    • Views: 6,352
    05-24-2013, 11:26 AM Go to last post
  12. Analysis Likert Data and Comparing 2 Groups

    I have 2 groups of people. There are 75 people in each group. Each group was given the same set of 7 Likert items. I want to compare the results...

    Started by nigellscott‎, 05-30-2013 08:27 AM
    likert items
    • Replies: 7
    • Views: 2,552
    06-22-2013, 06:04 AM Go to last post
  13. t-test or Mann-Whitney test

    I am comparing two samples of IPO (Initial public offerings) companies using t-test and Wilcoxon Mann Whitney Test. But since I am comparing 102 IPO...

    Started by Ali Ali‎, 08-25-2013 10:50 AM
    • Replies: 7
    • Views: 2,367
    08-26-2013, 04:39 PM Go to last post
  14. Rotation in Principal Components Analysis

    Hi, I was wondering if anybody could give me some general advice on a specific issue. Is it possible to orthogonally (varimax) rotate when...

    Started by DanWeaving‎, 01-08-2014 12:36 PM
    • Replies: 7
    • Views: 5,463
    01-14-2014, 08:18 AM Go to last post
  15. 3 Groups of Participants & Likert data

    Hi, I'm new to the forum - though I have browsed and found the resources helpful for a long time. Thank you to all who contribute here. I have...

    Started by Satele‎, 10-28-2013 07:45 AM
    analysis, data, likert, ordinal, scale
    • Replies: 7
    • Views: 1,947
    11-05-2013, 07:00 AM Go to last post
  16. Is non-parametric test necessary for independent Likert-type items?

    Hi everyone I am having a difficulty in extending my survey analysis containing Likert-type item/questionnaires. I'll try my best to give a detailed...

    Started by mendygrace‎, 10-08-2013 11:04 PM
    descriptive analysis, non-parametric test, statisics
    • Replies: 7
    • Views: 2,333
    10-10-2013, 08:04 AM Go to last post
  17. statistical Analaysis? NEED HELP... URGENT!!!

    I am working using secondary data that was originally collected for another purpose. The data is from a teen pregnancy program among Latino youth....

    Started by leena‎, 11-11-2013 03:06 PM
    spss, statistical analysis
    • Replies: 7
    • Views: 1,813
    11-16-2013, 06:06 AM Go to last post
  18. Before/after surgery comparison

    Hi! I am currently doing experiments on song birds looking at pre- and post surgery data. I have 10 male birds each singing at least 100 songs both...

    Started by denstat‎, 01-22-2014 09:43 AM
    • Replies: 7
    • Views: 1,443
    02-04-2014, 09:20 AM Go to last post
  19. Low or high correlation?

    What does it mean when Pearson correlation gives a value of 0.7-0.8, while spearman correlation gives a value from 0.3-0.4? Pearson reports high...

    Started by John.Thomas‎, 03-12-2014 03:45 PM
    pearson correlation, spearman
    • Replies: 7
    • Views: 4,688
    03-13-2014, 09:16 AM Go to last post
  20. within subjects factors

    I have two within subjects factors. One variable is fatigue (baseline, fatigue, rest). The other variable is the amplitude of swallowing muscle...

    Started by eunkum1‎, 04-03-2014 04:44 PM
    • Replies: 7
    • Views: 1,445
    04-04-2014, 09:56 PM Go to last post
  21. Research about stock comovements due to similar ticker symbols

    Dear all, I have a small question about a small research that I wanted to do regarding stock symbol similarities and their abnormal returns. I...

    Started by bsc.j.j.w‎, 04-24-2014 06:51 PM
    • Replies: 7
    • Views: 1,797
    04-26-2014, 07:31 PM Go to last post
  22. Are these dependent samples?

    Hello everyone, I have a dataset with 6,000 respondents. A regression analysis will be run on it. Then, I will break down the dataset into three...

    Started by Kabouterke‎, 05-29-2014 01:13 PM
    • Replies: 7
    • Views: 1,729
    06-05-2014, 06:46 AM Go to last post
  23. Meta-analysis: different information about relationships between two variables

    Hello everyone I need help with my meta-analysis. I have collected all the studies that I wish to include and would like to take Pearson's...

    Started by Metanic‎, 07-30-2014 06:39 AM
    coefficient, correlation, metaanalysis
    • Replies: 7
    • Views: 930
    07-30-2014, 08:37 AM Go to last post
  24. Which method to use? ANOVA, one way regression, or else?

    Hi guys, For my research I have an independent variable 'education', which varies from 1 (low) to 6 (high) and a dependent dummy variable which is...

    Started by CindyD93‎, 08-02-2014 04:05 AM
    anova, dummy, regression, spss
    • Replies: 7
    • Views: 1,808
    08-03-2014, 02:52 AM Go to last post
  25. dealing with unequal sample sizes... can anyone help please?

    Hello, I am comparing men and women on outcomes of their diagnostic assessment (autism). there are approx 600 men and 200 women. I have used...

    Started by ellie_w‎, 11-17-2014 10:10 AM
    representativeness, unequal sample sizes
    • Replies: 7
    • Views: 2,520
    11-18-2014, 04:14 AM Go to last post
  26. correcting for early user bias

    Okay, forgive me if this is in the wrong place. Feel free to move it if it isn't. And please forgive me as I know VERY little about statistics and my...

    Started by hoodleehoo‎, 07-20-2015 01:38 PM
    • Replies: 7
    • Views: 2,274
    07-20-2015, 08:24 PM Go to last post
  27. Kolmogorov-Smirnov vs. Kuiper test

    Hello, I would like to compare two 2D distributions with quantitative variables, illustrated here: For each "x", they are several measures...

    Started by recherche888‎, 08-05-2015 12:21 PM
    • Replies: 7
    • Views: 1,877
    08-06-2015, 07:48 AM Go to last post
  28. 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: 2,350
    12-04-2015, 10:26 PM Go to last post
  29. Theory of p value matching????

    I am required to write about this for my lit review. I asked the stats lecturer but he said he never heard of it! could anyone hazard a guess to...

    Started by akav‎, 11-13-2015 10:16 AM
    • Replies: 7
    • Views: 1,612
    11-13-2015, 02:25 PM Go to last post
  30. Post One response variable and multiple explanatory variables (numeric and factor values)

    Hello everyone, I am a master student in Biology. I am now trying to analyse my thesis data, but I am facing a problem: I do not understand which...

    Started by Cass123‎, 11-15-2015 11:48 AM
    • Replies: 7
    • Views: 2,850
    11-21-2015, 01:30 PM Go to last post
  31. Multiple testing?

    Hi all, I have a question about some analyses that I did. I examined a large hospital admissions data set and the data were grouped by areas 1, 2,...

    Started by wernie07‎, 12-17-2015 03:07 PM
    • Replies: 7
    • Views: 1,676
    12-18-2015, 10:54 AM Go to last post
  32. Should I be using a MANOVA?

    Hi all, I apologise in advance if I explain this poorly - this is all somewhat new to me. I'm currently doing a small piece of classroom research...

    Started by dbang‎, 12-28-2015 01:40 AM
    • Replies: 7
    • Views: 1,224
    12-29-2015, 06:40 AM Go to last post
  33. How does one develop statistical models to compensate for weakness in public data?

    Hi everyone. I have an interview coming up and the role is data centric. I have a strong knowledge of data and management, however I have never...

    Started by Jaysin‎, 08-23-2016 05:28 PM
    • Replies: 7
    • Views: 1,112
    08-24-2016, 11:08 AM Go to last post
  34. Name That Model!

    Keywords: OLS, WLS, GLM, GzLM, Heteroscedasticity , Assumptions, Residuals, Errors Hullo I have been working full time and studying part time...

    Started by dj_johnphillips‎, 08-04-2016 02:33 PM
    • Replies: 7
    • Views: 1,845
    08-05-2016, 04:22 PM Go to last post
  35. Poisson Distribution

    Hi, I am using the Poission distribution to calculate probabillity for x = X. Poisson distribution is skewed to the right when lambda is small....

    Started by samot79‎, 02-08-2017 08:21 AM
    • Replies: 7
    • Views: 2,205
    02-20-2017, 05:07 AM Go to last post
  36. Correlation length

    Hi all, I'm working on a hydrological model. I supposed to build a mesh with correlation length in the permeability field. I know what is the...

    Started by Evyatar‎, 02-02-2017 04:14 AM
    correlation, correlation length
    • Replies: 7
    • Views: 2,980
    02-08-2017, 10:34 AM Go to last post
  37. Modeling traffic according to a distribution.

    Hello everybody! I'm new in this forum and I hope this is the right place to post this thread.. I'd like to kindly ask you just a suggestion to...

    Started by smoking81‎, 06-19-2008 02:44 AM
    • Replies: 6
    • Views: 3,642
    06-27-2008, 05:47 AM Go to last post
  38. 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: 6,614
    12-12-2008, 09:43 AM Go to last post
  39. Discriminant analysis with mostly incomplete cases

    Hello. I have a bit of a biostats problem. Ive got data on 5 groups and 15 species. There are 9 variables, and 1000 cases total. The problem,...

    Started by Dorquemada‎, 01-29-2009 07:01 PM
    • Replies: 6
    • Views: 2,920
    03-02-2009, 12:52 AM Go to last post
  40. gender differences

    Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

    Started by 12345678‎, 04-10-2009 01:08 AM
    • Replies: 6
    • Views: 5,032
    05-09-2009, 07:40 PM Go to last post
  41. Random no, mle,method of moments

    Hi. 1. I generate a random sample x=(x1,,xn) of size n from dist A with parameters (a1,a2) in R. 2. I have a likelihood function which involves...

    Started by tsukiko‎, 03-23-2010 03:42 AM
    • Replies: 6
    • Views: 3,346
    03-24-2010, 06:06 AM Go to last post
  42. Red face Analyzing factor scores from principal components analysis

    Hoping someone can help - I performed a PCA (using SPSS 18 Gradpack) on 10 variables (all measured on a scale of 0-10). Cases are individual...

    Started by careerstudent‎, 04-14-2010 06:34 PM
    • Replies: 6
    • Views: 5,640
    04-17-2010, 02:45 PM Go to last post
  43. Extreme events...

    Hi. Is {w:P(w) is very small} acceptable to translate the meaning of extreme events given in the following sentence: An extreme event is defined as...

    Started by tsukiko‎, 07-14-2010 07:41 AM
    • Replies: 6
    • Views: 4,630
    07-14-2010, 07:47 PM Go to last post
  44. Bootstrap Spearman coeff.: intepreting results

    Hi! I would very appreciate if someone can kindly provide some hints on the following issue. I am interested in the correlation between two...

    Started by gianmarco‎, 11-09-2010 11:29 AM
    • Replies: 6
    • Views: 9,726
    11-14-2010, 07:02 AM Go to last post
  45. Census & tests for significance?

    I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

    Started by pbakker‎, 11-12-2010 09:35 AM
    • Replies: 6
    • Views: 6,116
    11-12-2010, 02:09 PM Go to last post
  46. Application of Significance Testing

    SAMPLE SIZE: 518 in each city QUESTION: Likeness to have Coke after dinner. Positive Response to the Question: 320 in each city ...

    Started by bsaikrishna‎, 12-06-2010 02:47 AM
    • Replies: 6
    • Views: 5,722
    12-08-2010, 12:54 AM Go to last post
  47. determening normality in repeated measures ANOVA

    Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

    Started by BBD‎, 01-29-2011 01:47 AM
    • Replies: 6
    • Views: 19,561
    07-19-2011, 05:11 AM Go to last post
  48. What statistical test should I use to check to ratio?

    I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

    Started by ch.niladri‎, 02-09-2011 01:21 AM
    • Replies: 6
    • Views: 14,928
    02-16-2011, 01:37 PM Go to last post
  49. 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: 7,034
    03-21-2011, 01:34 AM Go to last post
  50. Bayesian inference, MAP and sampling (Gibbs)

    Hi all I'm applying bayes inference to a GMM, based on some data set. I'm using Gibbs sampling to get the "samples" from the posteriors (the mean's...

    Started by avima‎, 04-12-2011 11:53 AM
    • Replies: 6
    • Views: 4,946
    04-17-2011, 09:30 PM Go to last post
  51. chi-square with small sample size

    I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

    Started by fishystats‎, 05-19-2011 10:39 PM
    • Replies: 6
    • Views: 8,979
    05-20-2011, 12:24 PM Go to last post
  52. 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: 2,945
    06-06-2011, 03:43 PM Go to last post
  53. test which of two models is better predictor -- but the two are correlated with each

    Dear All -- Can anyone please please help me? I have a dichotomous dependent variable Y There are two alternative models for predicting Y The...

    Started by dbodoff‎, 06-22-2011 09:45 PM
    • Replies: 6
    • Views: 3,490
    09-02-2011, 06:46 PM Go to last post
  54. Help Me ........

    I am looking for a topic for my Mphil research. I am fed up with searching for a topic. i am interested in computational statistics, multivariate...

    Started by hpanoo‎, 10-26-2011 09:26 AM
    • Replies: 6
    • Views: 2,004
    10-27-2011, 03:57 PM Go to last post
  55. excel to SAS

    library work 'c:\documents and settings\desktop\s' data s.sas; infile 'C:\Documents and Settings\Desktop\sas.prn' firstobs=2; input subject salary...

    Started by shanehall.m‎, 11-07-2011 09:48 AM
    infile, sas, sas program
    • Replies: 6
    • Views: 4,360
    11-07-2011, 04:08 PM Go to last post
  56. significant interaction but variables not significant on their own

    Hi I was wondering if anyone could help me. I have been looking at consumers purchase intention levels across three indepedent variables, age,...

    Started by kassos‎, 11-22-2011 09:52 AM
    • Replies: 6
    • Views: 7,489
    11-30-2011, 12:38 PM Go to last post
  57. Looking for One Dimensional Randomness Test ??

    Hello everyone, I hope everything is going very well with all of you. I need you help finding an answer of the following question. I do have...

    Started by Raid‎, 12-08-2011 09:36 PM
    • Replies: 6
    • Views: 2,088
    12-09-2011, 02:31 PM Go to last post
  58. longitudinal analysis help

    Hi there Im struggling to figure out which statistical test i need to use on my data and then also how to carry this out in R or SPSS.... I have...

    Started by andyspeak‎, 12-15-2011 10:25 AM
    longitudinal study, time-series
    • Replies: 6
    • Views: 2,580
    12-29-2011, 01:09 PM Go to last post
  59. Writing my own package for classes

    Hi, I'm looking for idea for package(about 5 functions and one base data) in R. Everything what come to my mind is closed to what I do on classes,...

    Started by ldurniat‎, 01-04-2012 07:29 AM
    • Replies: 6
    • Views: 1,707
    01-04-2012, 07:24 PM Go to last post
  60. Difficulty with Rank-biserial correlation coefficient, N = 5

    Hi there, I am calculating Difficulty with Rank-biserial correlation coefficients in a spreadsheet using the following formula: rb = (2/n)*(Y1...

    Started by BOAZ‎, 01-22-2012 05:59 PM
    rank-biserial correlation
    • Replies: 6
    • Views: 7,846
    01-22-2012, 08:49 PM Go to last post

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