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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: 18,694
    10-11-2014, 12:02 PM Go to last post
  1. Question about splitting data

    I am wondering what the most common way to handle data is wherein a participant belongs to multiple groups. For example, if you're wanting to run...

    Started by bcrider‎, 08-14-2014 09:25 PM
    categorical data, regression analysis
    • Replies: 0
    • Views: 1,218
    08-14-2014, 09:25 PM Go to last post
  2. Correct methodology when not sure of linearity for continuous response variable

    I already posted on this, but haven't gotten an answer to my core question - which is, what type of statistical analysis should I run. I have...

    Started by bcrider‎, 08-16-2014 07:33 PM
    categorical iv, continuous dv, methodology
    • Replies: 1
    • Views: 1,201
    08-17-2014, 04:21 AM Go to last post
  3. How to compare data from different periods

    I want to analyze the performance of two groups of organizations over time (year to year), using existing information. The groups are similar,...

    Started by bdbailey‎, 10-14-2009 12:43 PM
    • Replies: 0
    • Views: 4,878
    10-14-2009, 12:43 PM Go to last post
  4. Which statistical test? Help

    Hi I am stumped on what statistical test to used and was looking for some advice for a present study. There is one IV: experimental vs control...

    Started by bea123‎, 02-13-2013 10:56 AM
    • Replies: 1
    • Views: 1,208
    02-13-2013, 12:19 PM Go to last post
  5. Need help!!

    Im doing my research on groeth response of tomato. And i got the average weekly increment in height T1-34 cm t2- 38 cm t3- 43 cm t4- 48 cm t5-...

    Started by beachbomb94‎, 02-05-2014 11:34 AM
    • Replies: 1
    • Views: 1,375
    02-05-2014, 11:53 AM Go to last post
  6. Assumed autocorrelation

    Hi all-- I apologize if this is an incredibly naive question, but I'm currently working with a signal and I need to find the "assumed lag-1...

    Started by beagle48‎, 10-27-2010 09:35 AM
    • Replies: 0
    • Views: 1,542
    10-27-2010, 09:35 AM Go to last post
  7. Does the sequential Bonferroni correction method apply to my data?

    The literature on Bonferroni correction methods is confusing me... I have compared means of multiple variables (some dependent, some independent)...

    Started by bearica5‎, 01-07-2014 03:37 PM
    bonferroni, bonferroni correction
    • Replies: 1
    • Views: 2,351
    01-07-2014, 04:56 PM Go to last post
  8. Confused: Metropolis-Hastings, its variations and the Hastings correction ratio

    Hello everyone, Over the past few weeks I have been studying MCMC and Metropolis-Hastings algorithms. Unfortunately I am stuck and confused with...

    Started by Bekos‎, 07-19-2013 02:34 AM
    mcmc, metropolis-hastings
    • Replies: 2
    • Views: 3,294
    02-08-2016, 11:05 PM Go to last post
  9. Question Testing for trend in a r*c table, in STATA which method should I use?

    I have searched for multiple websites, and only found the information regarding how to test the trend in a 2*k table, which was not the exact...

    Started by belindalimm‎, 07-29-2016 02:04 PM
    • Replies: 0
    • Views: 817
    07-29-2016, 02:04 PM Go to last post
  10. [Finite population correction(FPC)] Did I discover FPC(nHr)?

    talkstats members are knowledgeable. Anybody knows there is any precursor already published FPC(H^n_r). The journals rejected my paper. Finite...

    Started by BenchPlayer‎, 09-07-2016 08:38 AM
    estimator, fpc
    • Replies: 3
    • Views: 2,107
    09-07-2016, 09:09 AM Go to last post
  11. T test

    Experimental design 3 virus types x 3 exposure concentrations x 2 replicates of 15 fish How can I use the T test to determine if my replicates...

    Started by bendi13‎, 10-12-2009 12:17 PM
    • Replies: 1
    • Views: 1,938
    10-13-2009, 10:12 PM Go to last post
  12. Convert SD and confidence intervals

    Hi I want to perform a meta analysis on pain outcomes. Some studies use a 0-10 scale, others 1-10, 0-100 or 1-100. I'd like to convert the...

    Started by benedsmith@hotmail.com‎, 05-12-2014 11:32 AM
    • Replies: 0
    • Views: 1,354
    05-12-2014, 11:32 AM Go to last post
  13. MANOVA post hoc or simple main effect

    does anybody know, when conducting a 3 x 3 MANOVA, if the interaction effect and both main effects are significant, is there any...

    Started by Benson‎, 10-04-2011 09:10 AM
    • Replies: 0
    • Views: 2,618
    10-04-2011, 09:10 AM Go to last post
  14. Data collection gone awry -- now what do I do?

    Trying to keep this as brief as possible ... I handle the stats for a pilot project for my employer (a government agency). We're trying to...

    Started by Berley‎, 03-30-2010 02:21 PM
    • Replies: 0
    • Views: 2,350
    03-30-2010, 02:21 PM Go to last post
  15. Intermediate outcomes: use as predictors in logistic regression, or use Naive Bayes?

    I am predicting whether or not someone will receive a grant from an agency (dichotomous outcome). I have generated a model that uses various...

    Started by bernoulli‎, 12-08-2010 03:45 PM
    • Replies: 0
    • Views: 3,496
    12-08-2010, 03:45 PM Go to last post
  16. Lightbulb Using "AIC per sample" to compare logistic regression models

    I'm generating nested models using logistic regression and comparing them by AIC. One issue that arises is that not all samples have all...

    Started by bernoulli‎, 09-05-2011 05:33 PM
    aic, likelihood, logistic regression
    • Replies: 1
    • Views: 2,428
    09-05-2011, 10:34 PM Go to last post
  17. Need help to understand which statistical test to use on my data.

    Hi all, i'm new here and it's a pleasure to join this forum. This is my first question here, i think it's easy to answer but i'm not absolutely...

    Started by bertomaycry‎, 04-25-2013 01:51 PM
    • Replies: 2
    • Views: 2,505
    04-25-2013, 03:25 PM Go to last post
  18. Red face Could anyone recommend an interactive application for mass data analysis?

    Hi, everybody I need to conduct a large amount of data analysis on database. Could anyone recommend an interactive application for data analysis?...

    Started by bestbird7788‎, 05-22-2012 02:53 AM
    analysis, database, interactive, mass data, sql
    • Replies: 13
    • Views: 3,105
    05-31-2012, 09:25 PM Go to last post
  19. How can I statistically prove which data is more reliable

    We have a task to statistically identify which data set is more reliable among the two sources. Case background: Design function releases drawings...

    Started by Bhaskar‎, 11-26-2016 12:56 AM
    • Replies: 0
    • Views: 2,525
    11-26-2016, 12:56 AM Go to last post
  20. How to perform reverse score transformations? (non-normal data)

    Hello, Sadly, my data are significantly non-normal, negatively and not positively skewed, so that leaves me, according to some statisticians, with...

    Started by biancaelenai‎, 05-12-2016 03:54 AM
    data transformation, non-normality, skewness
    • Replies: 1
    • Views: 1,132
    05-12-2016, 06:13 AM Go to last post
  21. how to Compare means of first differenced stationary time series

    hello! I have a monthly data series of commodity spot prices from 1994 to 2010. I have split the data from 1994 to 2002 and 2003 to 2010 due to...

    Started by bids‎, 06-03-2014 11:34 PM
    • Replies: 0
    • Views: 1,208
    06-03-2014, 11:34 PM Go to last post
  22. Employee survey: how to make it more representative?

    Gentlemen, I am creating a survey to monitor employee satisfaction with their employers. I am designing a survey which contains questions...

    Started by Biersma‎, 07-26-2012 08:20 AM
    • Replies: 1
    • Views: 2,013
    07-26-2012, 10:12 AM Go to last post
  23. Project ideas for Statistical quality control

    I was hoping I could get some beneficial input as to what problem I should address for my statistical quality control project. As of now we have...

    Started by bigbob‎, 03-01-2014 09:38 PM
    • Replies: 0
    • Views: 5,809
    03-01-2014, 09:38 PM Go to last post
  24. 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: 1,911
    07-07-2013, 02:54 PM Go to last post
  25. Chance performance in a binary choice task

    Hello! I am analyzing data in which participants have answered 80 binary-choice questions; one option is correct and one option is incorrect. Is...

    Started by bimodal‎, 03-26-2012 10:58 AM
    • Replies: 1
    • Views: 2,279
    03-26-2012, 11:34 AM Go to last post
  26. How robust is ANOVA's F-statistic?

    Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

    Started by bimodal‎, 06-29-2012 12:28 PM
    • Replies: 3
    • Views: 3,202
    06-29-2012, 01:48 PM Go to last post
  27. Post Multivariate analysis with dependent variables and replicates

    Dear All, I have been stuck in this issue for 2nd day now. I have a dataset of 13 depended variables (consequitive (not repeated!) measurment...

    Started by Bioequivalencefreak‎, 08-10-2012 05:49 AM
    dependent variables, manova, simulation
    • Replies: 0
    • Views: 1,406
    08-10-2012, 05:49 AM Go to last post
  28. Multiple comparisons and multiple time points

    Hi all, I wanted to ask a questions that I would assume I should know by now... I have done an experiment where I am evaluating the effect of...

    Started by Bioman‎, 03-08-2013 09:34 PM
    • Replies: 4
    • Views: 2,110
    04-01-2013, 02:10 PM Go to last post
  29. Chi-square influential categories

    I have counts of events in a number of categories and an a priori expected frequency for those events. Clearly, this is a standard chi-squared. ...

    Started by bioniclime‎, 10-27-2014 12:05 PM
    chi-square test, influence
    • Replies: 3
    • Views: 1,654
    10-27-2014, 03:55 PM Go to last post
  30. Power analysis 1-sided vs 2-sided

    I'm curious how power analysis changes when you go from a 2-sided test to a 1-sided test. If in both cases I keep my alpha at .05, my effect size and...

    Started by biostatsmia‎, 01-27-2011 04:20 PM
    • Replies: 0
    • Views: 3,704
    01-27-2011, 04:20 PM Go to last post
  31. Exclamation Sample Size Selection

    Hi All I am having trouble with a sample size selection. I would like to run a study on the following applications to a program and record how many...

    Started by Bird1990‎, 12-12-2015 12:33 PM
    • Replies: 3
    • Views: 2,017
    12-12-2015, 09:28 PM Go to last post
  32. Using a valid researh tool with missing data

    Hi guys, During my M.A thesis i've developed a research tool to measure Urabnic gentrification. The tool is build of 10 items - all of them are...

    Started by Bitbels‎, 11-14-2011 09:22 AM
    • Replies: 3
    • Views: 1,892
    11-14-2011, 11:29 PM Go to last post
  33. 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: 2,349
    01-13-2017, 02:25 PM Go to last post
  34. Mann Whitney vs. two tailed t-test

    I am new to statistics and am in need of some help. I am running a study where I am providing two groups with surveys to test for their perceptions...

    Started by bjrscj‎, 03-22-2013 10:33 PM
    t-test
    • Replies: 0
    • Views: 3,084
    03-22-2013, 10:33 PM Go to last post
  35. Confusions regarding Regression, Multicollinearity and Factor Analysis

    I am currently working with a data set that contains about 26 IVs of almost all sorts of scale of measurement (binary, nominal, ordinal and interval...

    Started by Blain Waan‎, 01-16-2013 08:00 AM
    factor analysis, multicollinearity, regresion analysis
    • Replies: 2
    • Views: 3,132
    01-29-2013, 03:18 PM Go to last post
  36. Hot deck imputation issues

    Background: I had a data set containing 212 observations with a lots of missing values. Most of the IVs and DVs are categorical (DVs are ordinal)...

    Started by Blain Waan‎, 01-28-2013 02:12 AM
    imputation, missing data imputation
    • Replies: 0
    • Views: 1,505
    01-28-2013, 02:12 AM Go to last post
  37. How to develop a health coverage plan for a particular disease?

    Currently, there is no government health coverage for cancer in our country and the prevalence of this disease is increasing rapidly. So I have...

    Started by Blain Waan‎, 05-27-2017 08:18 AM
    health economist, life assurance, references
    • Replies: 0
    • Views: 699
    05-27-2017, 08:18 AM Go to last post
  38. HLM-Longitudinal Analysis: Moderation in level 2 variables?

    Hi, I am creating a growth model using HLM 7 where Level 1 is Occasion and Level 2 is Person. I am trying to see if I can test the moderation...

    Started by Blair‎, 12-11-2012 07:11 PM
    growth model, hlm, longitudinal, moderation
    • Replies: 0
    • Views: 2,983
    12-11-2012, 07:11 PM Go to last post
  39. What kind of ANOVA is good for this

    Hello, In my research i've collected death % for cell cultures. One variable was the treatment used (0,2,4,10,16 exposure). Another one was the...

    Started by Blakey85‎, 08-16-2014 03:22 PM
    • Replies: 3
    • Views: 2,631
    08-17-2014, 01:53 PM Go to last post
  40. Help with inter-rater reliability

    Hi all, I've got a set of data that I need some advice on. I'm working on a pilot project where a group of four people evaluate essays. The way that...

    Started by Blank‎, 09-05-2012 02:17 PM
    reliability
    • Replies: 14
    • Views: 3,797
    09-07-2012, 05:13 PM Go to last post
  41. Please help?

    Alright, so honestly, I've actually looked up in both my textbooks as well as online tutorials for simplified explanations as to how I can solve the...

    Started by blithevanilla‎, 11-17-2008 12:18 AM
    • Replies: 0
    • Views: 2,252
    11-17-2008, 12:18 AM Go to last post
  42. This may be extraordinarily easy

    I don't know which is why I am asking here on this forum. We are in the middle of a debate and I have absolutely no idea whatsoever of what the...

    Started by Blitzburgh‎, 03-14-2011 04:41 PM
    • Replies: 1
    • Views: 2,325
    03-14-2011, 06:19 PM Go to last post
  43. KS or Wilcoxon?

    I have some survey data which I want to analyse using non-parametric test. It is a single sample (approx. 100) It is ordinal - likert scale e.g....

    Started by Blom‎, 04-18-2011 04:43 PM
    • Replies: 4
    • Views: 5,810
    04-21-2011, 01:37 PM Go to last post
  44. Wilcoxon Signed Rank test or Spearman's rho?

    Dear madam/sir, My apologies for posting so quickly yet another question, but hopefully you can help me out once more. I'm still analyzing my survey...

    Started by blubblub‎, 04-19-2013 09:08 AM
    • Replies: 3
    • Views: 9,049
    04-19-2013, 12:12 PM Go to last post
  45. Differences in responses on a 5 point scale between three groups? Kruskal-Wallis?

    Dear madam/sir, Recently I have designed a course that was run at three different locations. To know what the students thought of the course they...

    Started by blubblub‎, 04-18-2013 06:16 AM
    kruskal-wallis, nominal-ordinal, nonparametric
    • Replies: 2
    • Views: 1,902
    04-18-2013, 05:20 PM Go to last post
  46. Significance aside - correlation coefficient

    Hi everyone: It's been a while since I have posted here and I hope that I am posting in the right forum. In my field, sometimes people like to...

    Started by blue11‎, 08-14-2014 02:38 PM
    • Replies: 6
    • Views: 1,689
    08-15-2014, 08:48 AM Go to last post
  47. Research Design

    Hi there, i'm wondering if you guys could guide me a bit with my plans. Basically im intrested in looking at paranoid ideation (thr presence of...

    Started by blue2‎, 10-28-2010 04:48 PM
    • Replies: 9
    • Views: 4,006
    02-15-2011, 09:15 PM Go to last post
  48. Online-estimate of squared correlation coefficient for linear optimization

    Summary: Is there a way to directly estimate the squared correlation between two zero-mean Gaussian variables on-line and without storing more than...

    Started by blue2script‎, 03-28-2013 03:36 PM
    correlation, expectation, optimization
    • Replies: 0
    • Views: 1,792
    03-28-2013, 03:36 PM Go to last post
  49. Help - problem

    Hi I have a variable VA and want to know if there are significant differences in this variable between group A and group B. N = 93 samples...

    Started by bluecat‎, 06-16-2009 11:47 AM
    • Replies: 1
    • Views: 2,281
    06-17-2009, 10:15 PM Go to last post
  50. Getting desperate, please help!

    I have a research project and I am really confused on what I should do with the data. I asked people to complete a survey. The survey had 10...

    Started by blueirony‎, 04-28-2011 06:20 AM
    • Replies: 1
    • Views: 1,576
    04-29-2011, 04:26 PM Go to last post
  51. Chi Square - confused which variables to use.

    Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

    Started by Bluerosebowl‎, 11-04-2011 04:52 PM
    • Replies: 4
    • Views: 3,122
    11-14-2011, 08:38 AM Go to last post
  52. Assistance with Statistical Methodology to address research problems

    Im looking for some help with a statistical method(s) that can support the research questions i am looking to answer. I am basically doing research...

    Started by blueshark12‎, 01-15-2013 03:24 PM
    methodology, parametric model, statistical research, utaut
    • Replies: 1
    • Views: 1,482
    01-15-2013, 04:08 PM Go to last post
  53. Help with analysis

    Hi All, I am new to the forum. I have a specific question regarding one of the behavioral experiment we are conducting. This experiment is...

    Started by bluray‎, 02-12-2012 11:30 AM
    • Replies: 0
    • Views: 1,434
    02-12-2012, 11:30 AM Go to last post
  54. Understanding and Calculating Credible Intervals

    Hi, I am having trouble understanding and calculating credible intervals. My goal is to understand confidence intervals vs. credible intervals. ...

    Started by bmac1‎, 05-14-2017 03:18 AM
    • Replies: 3
    • Views: 850
    06-01-2017, 06:50 PM Go to last post
  55. Post Ratios of dependent variables

    Hello, I am conducting some research into tool marks. I have two sets of tool marks (A) and (B). I am trying to ascertain whether the tool...

    Started by bman‎, 01-22-2013 08:53 AM
    • Replies: 3
    • Views: 1,509
    01-22-2013, 10:08 AM Go to last post
  56. How to get p-value with categorical dependent var and nominal independent var

    Hi, I'm familiar with most of the univariate tests for significance (chi-square, t-test, 1-way anova, etc.) but I was stumped today. Which test do...

    Started by BME_Guy‎, 07-19-2011 08:25 PM
    • Replies: 1
    • Views: 3,791
    07-19-2011, 08:37 PM Go to last post
  57. Random Sampling in Mixed Models

    Hi, I have a data set that contains 40 firms over 15 years with firm and individual level data, with the individuals being sample randomly from...

    Started by bmgustaf‎, 08-06-2014 05:48 PM
    hlm, mixed model, multilevel model, panel data
    • Replies: 0
    • Views: 846
    08-06-2014, 05:48 PM Go to last post
  58. Analyse unemployment rate and public expenditure on active labour market policies?

    Hello everyone, I have a data set of OECD. I would like to analyse the relation between this two indicators: the relation between unemployment rate...

    Started by boale87‎, 01-17-2014 01:12 PM
    benefits, economics, gdp, policy, unemployment
    • Replies: 0
    • Views: 1,178
    01-17-2014, 01:12 PM Go to last post
  59. 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: 7,810
    01-22-2012, 08:49 PM Go to last post
  60. Controlling for familywise error for large correlations matrix

    Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise...

    Started by BOAZ‎, 02-19-2012 05:21 PM
    correlation, false discovery rate, familywise error, type i error
    • Replies: 0
    • Views: 1,785
    02-19-2012, 05:21 PM Go to last post

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