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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: 18,657
    10-11-2014, 12:02 PM Go to last post
  1. 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: 2,857
    02-29-2012, 04:04 AM Go to last post
  2. Partial Least Squares

    Hello, I am doing a project about "Partial Least Squares", and I find it a bit hard to understand the math part of the model. I was wondering if...

    Started by WeeG‎, 05-24-2008 11:20 AM
    • Replies: 0
    • Views: 2,856
    05-24-2008, 11:20 AM Go to last post
  3. Nominal variables

    I use a bivariate probit model to detect the choice between two strategies. I use besides the more interesting variables, some control variables....

    Started by momo‎, 12-05-2010 09:35 AM
    • Replies: 0
    • Views: 2,856
    12-05-2010, 09:35 AM Go to last post
  4. Randomization techniques

    Hi there, I was wondering whether you could recommend some simple randomization technique. I need to conduct a survey with a sample population...

    Started by Sylviastat‎, 12-21-2010 02:01 AM
    • Replies: 0
    • Views: 2,856
    12-21-2010, 02:01 AM Go to last post
  5. Cronbach's alpha with weighted data

    Hi I have a test whose reliability I want to calculate, using Cronbach's alpha. The first 18 questions are scored 0 or 1 (right or wrong). The...

    Started by jimbowylie‎, 09-29-2011 06:03 AM
    cronbach's alpha, research, weighted data
    • Replies: 0
    • Views: 2,856
    09-29-2011, 06:03 AM Go to last post
  6. Samples drawn from distributions without means: What inferences from subsamples?

    I am doing some work for a small nonprofit on time trends in U.S. income inequality, and comparing estimates based on samples from different surveys....

    Started by AndrewHoerner‎, 11-02-2010 02:13 PM
    • Replies: 1
    • Views: 2,855
    11-19-2010, 01:05 AM Go to last post
  7. Angry Correlation

    I have a list of vehicle models and a number of costs associated with them. For example: Mazda 1000.50 euro Peugeot 2000.23 euro Mazda...

    Started by maltesedog‎, 12-03-2008 03:22 AM
    • Replies: 12
    • Views: 2,853
    12-04-2008, 09:32 AM Go to last post
  8. Need help defining terms for mixed model nested ANOVA

    Hello - I am looking at the effects of restoration practices on a suite of environmental soil parameters through time. I am having trouble defining...

    Started by AASSBB‎, 07-08-2012 05:09 PM
    mixed model anova, nested anova
    • Replies: 5
    • Views: 2,853
    07-16-2012, 04:59 PM Go to last post
  9. Longitudinal Regression Issue

    Hi there, I am conducting a hierarchical longitudinal regression over an 18 month time span. I have main effects, quadratic terms and interactions...

    Started by mandy_a41‎, 01-22-2009 12:35 AM
    • Replies: 1
    • Views: 2,851
    01-22-2009, 02:16 AM Go to last post
  10. What's the null hypothesis here.

    I need to do a hypothesis test on the mean of bicycle hire lengths in London, the expectation is that the mean hire shouldn't exceed 60 minutes. ...

    Started by Wevans2303‎, 03-21-2012 11:30 AM
    • Replies: 5
    • Views: 2,851
    03-21-2012, 02:30 PM Go to last post
  11. Sample Size Calculater based on a Known Population Size

    Hello all, Part of the research objectives is to achieve generalisation of the findings and extend it to the rest of organisation. To do so, I...

    Started by wickedChecky‎, 07-31-2012 03:43 PM
    • Replies: 0
    • Views: 2,845
    07-31-2012, 03:43 PM Go to last post
  12. How do I compare different demographic groups that did the same survey?

    Hi, this is my first post so apologies in advanced if I'm asking things incorrectly! I'm doing a market research course and we've conducted a...

    Started by jamieaa64‎, 05-16-2011 06:11 AM
    • Replies: 0
    • Views: 2,844
    05-16-2011, 06:11 AM Go to last post
  13. Scetterplot of ZPRED vs. ZRESID in Multiple Regression

    Hi, I was wondering if any could help interpret my scatterplot in terms of homoscedasticity and independence of errors. I can't quite tell whether...

    Started by Gemma12‎, 04-22-2014 12:26 PM
    • Replies: 0
    • Views: 2,840
    04-22-2014, 12:26 PM Go to last post
  14. Maximum number of groups in Kruskal Wallis one-way analysis of variance

    Is there a maximum number of groups in Kruskal Wallis' one-way ANOVA? I am looking at a data set with 42 separate groups and I am unsure if there...

    Started by feignfeign‎, 01-09-2017 11:02 PM
    • Replies: 5
    • Views: 2,837
    01-12-2017, 07:14 PM Go to last post
  15. Bayesian model - Prior - Sensitivity Analysis

    Hi, I'm looking for pointers(articles, papers etc) on sensitivity analysis on prior distributions in bayesian models. Could someone point me to...

    Started by panbalag‎, 01-23-2011 06:33 PM
    • Replies: 0
    • Views: 2,834
    01-23-2011, 06:33 PM Go to last post
  16. How to test a hypothesis comparing two sets of likert item data

    Hi, I want to test a hypothesis but my two variables use likert item data and I don't know if they can be tested together. For example, Q1....

    Started by Sinead‎, 11-08-2012 02:15 AM
    • Replies: 6
    • Views: 2,831
    11-29-2012, 03:38 AM Go to last post
  17. Roulette- reducing variance

    Hello gents. I am new here and I have a question. Is someone here has a bit of will and knowledge around some statistical software or programming...

    Started by Matko‎, 05-16-2013 01:01 PM
    • Replies: 10
    • Views: 2,828
    05-16-2013, 06:14 PM Go to last post
  18. Normal Extreme Values

    Mostly I have been answering questions, but today I am asking one: what is the distribution of the maximum of n draws from a normal distribution? ...

    Started by ichbin‎, 10-15-2010 05:49 PM
    • Replies: 2
    • Views: 2,826
    10-17-2010, 11:19 PM Go to last post
  19. SEM - model fit question

    Hello all, my first post here. I was hoping that you could help me decide whether to decide for one model or another. Both have good fitting...

    Started by Anabela‎, 03-09-2011 02:54 PM
    • Replies: 2
    • Views: 2,825
    03-31-2011, 10:49 AM Go to last post
  20. Question about Statistics Application to C=0 Zero Acceptance Number Sampling Plan

    My company is using the following sampling table based on Nicholas Sequigla's Zero Acceptance Number Sampling Plan: ...

    Started by vphan27‎, 11-14-2011 06:29 PM
    • Replies: 0
    • Views: 2,825
    11-14-2011, 06:29 PM Go to last post
  21. 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: 2,822
    05-06-2009, 05:20 PM Go to last post
  22. Calculating a sample size for a study

    Hi, I am trying to do a study on patients with a certain disease. I would like to retrospectively review their charts and check whether there were...

    Started by yr20045‎, 10-23-2010 02:34 PM
    • Replies: 3
    • Views: 2,822
    10-24-2010, 10:24 AM Go to last post
  23. Hierarchical / variance partitioning - criticisms of the method

    I'm about to use variance partitioning to interpret my results of a given linear regression model and across models and have come across various...

    Started by Ph8‎, 09-17-2013 03:16 PM
    multicollinearity, partitioning, regression models
    • Replies: 0
    • Views: 2,821
    09-17-2013, 03:16 PM Go to last post
  24. Sample size help!!

    Hello! New to the forum but would greatly appreciate any help people may have to offer... Essentially I am trying to organise a scientific study...

    Started by aglove‎, 11-13-2014 03:23 PM
    • Replies: 5
    • Views: 2,821
    11-17-2014, 03:53 PM Go to last post
  25. repeated measurements

    Hi there, I am struggling to understand the way we analyze longitudinal data and I've gone through the net and some books but still have some...

    Started by leo nidas‎, 01-14-2010 10:29 AM
    • Replies: 0
    • Views: 2,817
    01-14-2010, 10:29 AM Go to last post
  26. 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: 2,817
    11-21-2015, 01:30 PM Go to last post
  27. nearest neighbor

    I am trying to understand some paper. In there author has the sample of 140 observations with respective x and y for coordinates. He then proceeds...

    Started by jenya56‎, 03-03-2010 10:31 PM
    • Replies: 1
    • Views: 2,813
    03-04-2010, 12:32 PM Go to last post
  28. Survey statistics

    Hi, I agreed to help a friend out with a project and am trying to find appropriate statistical tests for survey data, but I fear the survey itself...

    Started by edwardoconnor‎, 12-17-2010 07:34 PM
    • Replies: 4
    • Views: 2,813
    01-01-2011, 02:20 PM Go to last post
  29. Deriving meaningful information from a set.

    Hello all, I was working for my statistics class and kind of extrapolated a problem. I think sharing this with this forum will help in coming...

    Started by vivek_12315‎, 01-23-2011 02:05 PM
    mining, stats
    • Replies: 5
    • Views: 2,813
    01-23-2011, 04:22 PM Go to last post
  30. Which test to use please?

    Hello, I am relatively new to Stats and am have troubles deciding which test to use. I am testing the risky shift phenomenon. Participants were...

    Started by AthenaAnkou‎, 03-19-2013 08:35 AM
    • Replies: 2
    • Views: 2,811
    03-19-2013, 12:48 PM Go to last post
  31. Determining sample size in a factorial repeated measures ANOVA using GPower

    Hi all Can anybody tell me which F-test option in G power is appropriate to find out the sample size for a 2x2x2 repeated measures ANOVA?...

    Started by Jess@Leeds‎, 07-15-2014 11:35 AM
    factorial anova, g-power, power analysis, repeated measures anova, sample size
    • Replies: 0
    • Views: 2,811
    07-15-2014, 11:35 AM Go to last post
  32. 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: 2,810
    07-13-2009, 07:20 PM Go to last post
  33. Help with comparing variability of 3 variables on different scales

    Hi, I have 3 socioeconomic variables on different scales (yearly income, job category, and years of education) and I'm interested in determining...

    Started by Karissa‎, 10-05-2013 04:02 PM
    • Replies: 0
    • Views: 2,809
    10-05-2013, 04:02 PM Go to last post
  34. Simple regression

    Hi, I am having a problem and I know a way to solve but don't know how to statistically implement it. I'm trying to summarize the problem in a...

    Started by aimanusarma‎, 12-19-2009 03:44 AM
    • Replies: 4
    • Views: 2,808
    12-25-2009, 09:18 PM Go to last post
  35. what p-value do I use with a small population size?

    Hello everyone, I have been told that I should have a smaller p-value threshold rather than the "usual" p=<0.05 threshold to determine...

    Started by statsconfused‎, 08-20-2013 01:25 PM
    • Replies: 2
    • Views: 2,808
    08-21-2013, 04:43 AM Go to last post
  36. Multivariate Normality accepted at 5% significance level but rejected at 1% ??

    Hi, I am new to this forum. I am trying to test whether a set of variables in the data follow multivariate normal distribution. I found Mardia's...

    Started by ashutosh‎, 03-27-2013 02:15 PM
    multivariate normal, null hypothesis, p value, significance level
    • Replies: 1
    • Views: 2,804
    03-27-2013, 02:30 PM Go to last post
  37. What statistical test should I use?

    I have created high and low variables from 1 variable. I want to see whether the mean of the "high" subjects differs from the mean of the "low"...

    Started by lilchicken‎, 02-09-2011 12:46 AM
    • Replies: 4
    • Views: 2,797
    02-09-2011, 05:19 AM Go to last post
  38. 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: 2,797
    08-06-2013, 04:46 PM Go to last post
  39. How to run random effect model on spss? or anyother soft.

    Hi, I have estimated a fixed effect model from a panel of time series data. I need now to estimate a random effect model? Please any help...

    Started by tantan‎, 03-30-2010 01:45 PM
    • Replies: 0
    • Views: 2,796
    03-30-2010, 01:45 PM Go to last post
  40. Chernoff Faces Taken Seriously?

    Often I come across web articles or books mention Chernoff faces as a way to efficiently express multivariate data with up to 10 different numeric...

    Started by trinker‎, 08-04-2011 11:28 AM
    • Replies: 1
    • Views: 2,795
    08-04-2011, 11:37 AM Go to last post
  41. Why "controlling for X" studies may be fatally flawed

    I came across this paper this week, which was quite an eye-opener for me, so I wanted to share. We are probably all familiar with "controlling for...

    Started by Junes‎, 10-19-2016 05:51 PM
    • Replies: 3
    • Views: 2,793
    10-19-2016, 06:45 PM Go to last post
  42. Balance in covariates in randomized trials

    Hi, I am new to this forum and have a question regarding randomized controlled trials (RCT). How can you mathematically/statistically derive that...

    Started by tompa‎, 11-05-2016 09:51 AM
    • Replies: 0
    • Views: 2,792
    11-05-2016, 09:51 AM Go to last post
  43. F-test Analyis HELP

    I've just carried out an f-test on excel as I want to perform an independent t-test so I wanted to check the equality of variances. I have always...

    Started by cheekychica‎, 07-15-2011 01:30 PM
    • Replies: 4
    • Views: 2,791
    07-16-2011, 03:45 PM Go to last post
  44. MDS with confusion matrix

    Hi, I want to run a MDS from some data of close set identification. Therefore, I have a 12X12 confusion matrix and I need to transform it to a...

    Started by zozo‎, 06-23-2009 07:12 PM
    • Replies: 0
    • Views: 2,790
    06-23-2009, 07:12 PM Go to last post
  45. Analysis of a matched case-control study

    Please, i need help on my analysis. It is a 1-1 matched case-control studies. I am willing to pay for the guidance. My deadline is friday.

    Started by Madonna‎, 01-27-2014 04:04 AM
    • Replies: 11
    • Views: 2,787
    01-27-2014, 10:17 AM Go to last post
  46. structural zeros and chi square

    Hello, I have been reading a little bit about structural zeros and chi-square goodness of fit tests. I've not been able to find a clear answer...

    Started by wdmn‎, 12-05-2015 02:08 PM
    • Replies: 2
    • Views: 2,784
    12-05-2015, 03:48 PM Go to last post
  47. Testing Research Hypothesis

    Hi All, I would like to ask about the best method to test the hypothesis research. I have 2 ethnic groups (both gender) and I want to know the...

    Started by ghada8888‎, 11-14-2011 12:39 PM
    • Replies: 4
    • Views: 2,783
    11-15-2011, 08:59 AM Go to last post
  48. I'm Confused, simple question...

    Hello all. I was reading a friend's dissertation and came across something that left me a bit perplexed. In his study, he stated that there...

    Started by Tolstoy‎, 10-15-2009 01:13 PM
    • Replies: 3
    • Views: 2,781
    10-15-2009, 03:56 PM Go to last post
  49. Smile Would someone please please help with ANCOVA?

    I am an elementary school teacher and know next to nothing about statistics. It's been over 15 years since I was in a statistics class. I am working...

    Started by celticangel‎, 02-21-2009 04:03 PM
    • Replies: 1
    • Views: 2,777
    02-21-2009, 05:37 PM Go to last post
  50. Question I need help in my undergraduate project

    Hi all, I have conducted a questionnaire about factors affecting academic performance my sample size =300 students from different colleges...

    Started by Miss..Stats‎, 11-28-2011 04:50 PM
    • Replies: 9
    • Views: 2,776
    11-28-2011, 06:23 PM Go to last post
  51. Repeated measures ANOVA + multiple comparisons corrections

    Hello everybody, I had a question in regards to ANOVAs and multiple comparisons corrections (Bonferroni mostly). I am running a 3 way repeated...

    Started by rohanp16‎, 02-13-2011 09:12 PM
    • Replies: 0
    • Views: 2,774
    02-13-2011, 09:12 PM Go to last post
  52. is it possible to have multiple mediators that all fully mediate

    I have a situation where I found my two mediators are both full mediators Does it make sense? I would think there should be only one full mediators...

    Started by angelaabd‎, 02-14-2009 02:27 AM
    • Replies: 1
    • Views: 2,772
    02-14-2009, 03:15 AM Go to last post
  53. LISREL Problem with SEM's

    Could someone please help me whether it is possible to calculate a path diagram in LISREL that is designed as follows: Independent variables:...

    Started by Natalie_k‎, 02-23-2012 06:20 AM
    • Replies: 0
    • Views: 2,771
    02-23-2012, 06:20 AM Go to last post
  54. Meta-analysis - can I combine/use these studies?

    Hi! I'm trying to set up a meta-analysis with my thesis partner and we ran into trouble which our supervisor isn't able to solve. So I figured...

    Started by Jiske‎, 03-04-2014 11:21 AM
    compare main effects, interaction effects, meta-analysis
    • Replies: 3
    • Views: 2,771
    03-04-2014, 05:04 PM Go to last post
  55. Can anyone help me choose appropriate form(s) of analysis?

    Hi, I was wondering if anyone could possibly help advise me on choosing an appropriate form of analysis I have 2 groups of participants....

    Started by Kenny‎, 10-19-2014 12:05 PM
    • Replies: 6
    • Views: 2,769
    10-23-2014, 03:35 AM Go to last post
  56. How to calculate ARIMA(1,0,1)

    Hello, I want to forecast the 101th data of a time series and my data is as follow 99) 0.96 100) -0.2495 101) ? and my model Coefficients: ...

    Started by Fred_a‎, 03-11-2013 03:05 PM
    arima, time-series
    • Replies: 1
    • Views: 2,767
    03-12-2013, 02:17 AM Go to last post
  57. Can't find a convenient test for this huge dataset :-(

    Hi everyone, I have some trouble choosing the right test for the following study: I have a group of parents and a lot of ordinal measures. I...

    Started by Abdel‎, 05-12-2009 08:55 PM
    • Replies: 0
    • Views: 2,765
    05-12-2009, 08:55 PM Go to last post
  58. Product pricing question

    Hello all. It's been a long time since I've been on this forum. Glad I was able to find it again. I'm afraid my stats experience is limited to...

    Started by vangogh228‎, 12-08-2008 07:41 AM
    • Replies: 0
    • Views: 2,759
    12-08-2008, 07:41 AM Go to last post
  59. Paired Data

    Hi All, I have some paired data (pre and post test on the same subjects) I did a paired t-test to test the means. Now I want to look at...

    Started by Martingale‎, 11-12-2010 11:44 PM
    • Replies: 2
    • Views: 2,759
    11-14-2010, 08:58 PM Go to last post
  60. Analyzing with heavy skew, transforms not working?

    I have a set with around 200 individuals dealing with cognitive task scores. Most of it is skewed heavily and I'm trying to analyze ideally with a...

    Started by excellrec‎, 05-19-2011 02:25 PM
    • Replies: 7
    • Views: 2,758
    05-24-2011, 06:08 PM Go to last post

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