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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: 18,638
    10-11-2014, 12:02 PM Go to last post
  1. pairwise test PERMANOVA does not give t and p values for some comparisons

    Dear All, Another question that me and my collegues/ professors cant answer, and maybe one of you can give some ideas. some introduction: I am...

    Started by sofia‎, 05-04-2012 09:12 AM
    • Replies: 1
    • Views: 7,272
    05-04-2012, 09:05 PM Go to last post
  2. Response ratio

    Hi there, I want to explore the possibility of using meta-analysis statistics for prediction of various scenarios. I came across a...

    Started by yoavp81‎, 05-07-2013 02:23 AM
    • Replies: 3
    • Views: 7,238
    05-07-2013, 11:10 AM Go to last post
  3. 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: 7,225
    08-09-2013, 04:35 PM Go to last post
  4. Why use Kruskal-Wallis?

    Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

    Started by Eugenie‎, 08-13-2012 09:44 AM
    anova, bootstrapping, kruskal-wallis
    • Replies: 9
    • Views: 7,213
    08-13-2012, 03:14 PM Go to last post
  5. Factor Analysis vs Correspondence Analysis

    I was just reading about Factor and Correspondence Analysis. I am a bit confused from the time I realised that Correspondence Analysis also uses...

    Started by bsaikrishna‎, 12-27-2010 12:31 AM
    • Replies: 1
    • Views: 7,209
    12-27-2010, 05:00 AM Go to last post
  6. 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: 7,198
    07-08-2013, 11:38 AM Go to last post
  7. (non-)parametric test dilemma

    I want to compare means of 6 variables and to do correlation analysis. I did Kolmogorov-Smirnov test and it showed that 3 of them are normally...

    Started by rmil‎, 06-17-2009 10:45 AM
    • Replies: 7
    • Views: 7,183
    06-22-2009, 07:50 PM Go to last post
  8. Hey Guys I'm new and I need help

    So basically, I have a very little knowledge about using SPSS, but I'm willing to learn. The problem is I'm having hard time on how to organize the...

    Started by adrianbrah‎, 01-16-2012 12:35 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,155
    02-03-2012, 01:00 PM Go to last post
  9. paired anova for lack of a better word advice please

    Dear All i am stuck at the moment between a rock and a hard place. the short of the story is this. I have 84 petri dishes each containing 4 lines...

    Started by yoma819‎, 08-08-2010 05:58 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 7,096
    08-14-2010, 08:41 AM Go to last post
  10. Unhappy How do we compare medians?

    Hi, I have a project whereI have to compare short term and long term medians of a given data over four not consecetive years, like 1999, 2007,...

    Started by SadieKhan‎, 11-26-2010 07:14 AM
    • Replies: 2
    • Views: 7,089
    12-04-2010, 04:43 AM Go to last post
  11. generate overdispersed poisson data

    Hi there, Can anyone tell me how to produce overdispersed poisson data? An algorithm or something? I find it difficult. Thanx in advance for...

    Started by leo nidas‎, 06-17-2009 08:53 AM
    • Replies: 5
    • Views: 7,086
    06-19-2009, 03:17 AM Go to last post
  12. Question T-test help with determining whether its 1 or 2 tailed?

    Hi, I need to perform a t-test to determine the relationship between US govt spending on Police and the number of Rapes annually. So I have 53...

    Started by kenshi64‎, 02-23-2012 11:50 PM
    statistical analysis, t-test
    • Replies: 10
    • Views: 7,083
    02-28-2012, 02:31 PM Go to last post
  13. Working With Population Data

    Is there a way to determine if a difference is significant when using entire population data? For example if i see that the difference between test...

    Started by StevenK‎, 08-23-2010 06:14 PM
    • Replies: 9
    • Views: 7,061
    09-23-2010, 05:12 AM Go to last post
  14. Repeated k-fold Cross-Validation

    I saw this: "Any advices on practice? It depends on the data, but it's common to find examples cases 10 fold CV, plus repetition: 10 fold CV,...

    Started by hlsmith‎, 12-09-2016 02:49 PM
    • Replies: 12
    • Views: 7,061
    12-16-2016, 10:35 AM Go to last post
  15. repeated measures MANOVA on mixed design

    Hi folks, I have data from a drug study that I am trying to perform statistical analysis on, and am not sure if my approach is correct. I was...

    Started by simhan4‎, 08-30-2010 03:24 PM
    • Replies: 0
    • Views: 7,018
    08-30-2010, 03:24 PM Go to last post
  16. Eigenvector for large matrices

    Well, this is kind of a linear algebra question, but is used very often in statistics, so it seems applicable for this forum. My question is, does...

    Started by senorbum‎, 06-30-2008 09:01 AM
    • Replies: 11
    • Views: 7,001
    07-01-2008, 01:58 PM Go to last post
  17. 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: 6,986
    03-21-2011, 01:34 AM Go to last post
  18. Hartigan's Dip Test for Bi-Modality: Rejecting surprising distributions

    Hi, I'm new here. Thanks for providing this forum! I'm checking some separate sample distributions for bi-modality since most but not all of them...

    Started by kerrio‎, 12-22-2011 12:31 AM
    • Replies: 1
    • Views: 6,972
    12-29-2011, 08:05 PM Go to last post
  19. Stats for whole population data

    Hi all - I'm an employee of a government department who has been asked to answer some question to do with a whole population data set. In short, here...

    Started by JimRobertsonnz‎, 12-07-2009 08:41 PM
    • Replies: 8
    • Views: 6,954
    01-04-2010, 11:13 AM Go to last post
  20. Question finding UMVUE

    let X_1,X_2,.....X_n be a random sample from f(x;\theta)=\frac{e^{-|x|/\theta}}{2\theta}, -\infty<x<\infty Find UMVUE of \theta^r help needed...

    Started by Sambit‎, 11-13-2010 07:45 AM
    • Replies: 3
    • Views: 6,926
    11-13-2010, 01:44 PM Go to last post
  21. Multicointegration - alternative variable?

    Time series: For example, if a dependent variable only have 17 observations could I replace it with something with more data if I want a rough...

    Started by tomandjerry714‎, 07-19-2010 07:31 PM
    • Replies: 0
    • Views: 6,826
    07-19-2010, 07:31 PM Go to last post
  22. Greatly unbalanced sizes of samples for Mann-Whitney U test.

    Hello, I want to compare two independent samples and by doing a little research I have concluded that the Mann-Whitney U test is the most...

    Started by LauraS‎, 12-01-2010 12:00 PM
    • Replies: 1
    • Views: 6,820
    12-02-2010, 05:55 AM Go to last post
  23. hypothesis testing for least squares fitting

    I have a spectrum that is composed of several things. I do least squares fitting in order to determine the amount of each component. For example: ...

    Started by llee‎, 02-11-2009 11:00 AM
    • Replies: 8
    • Views: 6,807
    03-02-2009, 10:30 AM Go to last post
  24. time variables in a regression

    Hi all, I'm looking at a linear regression model using the data on wars in the 20th century. There are two time variables on the right-hand...

    Started by user9791‎, 07-29-2008 08:35 AM
    • Replies: 2
    • Views: 6,796
    07-29-2008, 12:15 PM Go to last post
  25. how would you comment this frequency distribution?

    Hi! I would like to have some feedback on the attached frequency distribution histogram. It displays the bootstrap distribution of Spearman rs. ...

    Started by gianmarco‎, 10-27-2010 05:59 AM
    • Replies: 0
    • Views: 6,795
    10-27-2010, 05:59 AM Go to last post
  26. Expected Value

    A list of n items is arranged in random order; to find a requested item, they are searched sequentially until the desired item is found. So, how will...

    Started by SmileAli‎, 05-07-2010 06:37 PM
    • Replies: 9
    • Views: 6,784
    05-08-2010, 05:29 AM Go to last post
  27. What is the proper way to divide a skewed dataset into high, medium, and low interval

    I don't know if this is the proper forum for this. Hello, I have a skewed dataset, and I am dividing it into high, medium and low values. I don't...

    Started by clazu‎, 01-23-2011 01:23 AM
    • Replies: 2
    • Views: 6,773
    01-24-2011, 11:37 AM Go to last post
  28. Std. residuals Chi Square test

    Hi all, I am doing some research for a uni project but Im not particularly knowledgeable when it comes to statistics :). Basically, I have two...

    Started by fred_1‎, 12-23-2011 02:28 PM
    • Replies: 3
    • Views: 6,744
    12-24-2011, 03:10 AM Go to last post
  29. Nonparametric assumptions

    Hi, I've come across a paper in the environmental science literature that suggests that the assumption of independence (and additivity) needed in...

    Started by suobs‎, 07-24-2010 11:25 AM
    • Replies: 9
    • Views: 6,710
    07-29-2010, 11:17 AM Go to last post
  30. PCSE vs FGLS method for analyzing panel data

    Hi, Some guidance on the below inquiry would be much appreciated as I am having a hard time finding someone who is faimiliar with the PCSE and...

    Started by jlind135‎, 03-02-2010 04:44 PM
    • Replies: 0
    • Views: 6,703
    03-02-2010, 04:44 PM Go to last post
  31. Repeated measures anova or t test

    Hi, The question I have is about which test I could use for the following case: - two groups (an experimental and a control group) - two measures...

    Started by pcastro‎, 12-17-2010 01:25 PM
    • Replies: 3
    • Views: 6,703
    01-08-2011, 12:43 PM Go to last post
  32. What to do when number of variables is greater than number of observations?

    What are some techniques that are utilized when the number of predictors is greater than the number of observations?

    Started by lord12‎, 01-30-2013 04:12 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 6,703
    02-15-2013, 02:36 PM Go to last post
  33. best way to use Cronbach's alpha?

    I am making my first foray into survey based research. A quick question or two about Cronbach's alpha: My survey included questions about...

    Started by student's t top‎, 06-07-2010 02:22 PM
    • Replies: 1
    • Views: 6,679
    06-07-2010, 03:55 PM Go to last post
  34. 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: 6,662
    07-04-2010, 05:19 AM Go to last post
  35. Can anyone explain Poisson regression for doing time trend?

    It would be a big help if someone could give a practical example (by hand) how Poisson regression is used to calculate a time trend line, and...

    Started by daniel_goldman‎, 02-18-2014 04:40 AM
    poisson regression, time trend
    • Replies: 12
    • Views: 6,660
    02-19-2014, 06:52 PM Go to last post
  36. Numeric algorithm to compute probability for Beta Binomial

    Dear all, I am trying to find a numeric method that can be handled at least by Excel to compute the probabilities of Beta Binomial distribution....

    Started by LLICZ‎, 09-24-2010 01:04 PM
    • Replies: 2
    • Views: 6,624
    09-26-2010, 03:48 PM Go to last post
  37. Sum of independent beta-Bernoulli random variables

    I'm looking for the distribution of the sum of independent beta-Bernoulli random variables, that is Bernoulli random variables with beta-distributed...

    Started by SBlais‎, 11-30-2011 01:55 PM
    bernoulli distribution, beta distribution, binominal, distribution, mathematical statistics
    • Replies: 5
    • Views: 6,616
    11-30-2011, 04:36 PM Go to last post
  38. Correlation Proof

    Hi guys, wondering if you could help me with a proof that I am trying to figure out. Here it is... Corr (A, B) = 0 and Corr (B, C) = 0. This...

    Started by statsq45‎, 09-25-2010 06:24 PM
    • Replies: 7
    • Views: 6,591
    10-07-2010, 03:34 PM Go to last post
  39. 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: 6,572
    12-12-2008, 09:43 AM Go to last post
  40. bell curve question

    I have data distributed unevenly on both side of the average.How do I go about normalizing the data so that it makes a perfect curve? I don't have a...

    Started by cpp_coder‎, 05-26-2008 01:49 PM
    • Replies: 10
    • Views: 6,529
    05-30-2008, 10:15 AM Go to last post
  41. error on percentile estimation

    Hi all, I have a problem that I need help on please. I have some 1000 samples from an unknown distribution, from which I wish to derive various...

    Started by Jack Carter‎, 08-17-2010 03:54 AM
    • Replies: 2
    • Views: 6,509
    08-17-2010, 06:01 AM Go to last post
  42. How to reduce number of variables using PCA analysis ?

    I would like to reduce the number of variables to add to the regression model. I have too many variables in relation to my samples. I have done PCA...

    Started by dada‎, 01-08-2013 02:59 PM
    • Replies: 3
    • Views: 6,495
    01-08-2013, 06:19 PM Go to last post
  43. How do I report marginal means of a two-way unrelated ANOVA correctly? APA-style

    Hello, after doing a two-way unrelated ANOVA (General Linear Model > Univariate) on SPSS, I am confused how to report the output correctly. My...

    Started by ein8horn‎, 08-21-2011 05:46 PM
    anova, apa, marginal, means, report
    • Replies: 0
    • Views: 6,463
    08-21-2011, 05:46 PM Go to last post
  44. A nice easy one about Repeated Measures ANOVA

    Hello! A basic question from a not-very-statistically-savvy person: I have data from 2 groups of patients who underwent knee replacement...

    Started by okennedy‎, 10-06-2008 08:36 AM
    • Replies: 5
    • Views: 6,460
    10-07-2008, 01:00 PM Go to last post
  45. Exclamation Are scores significantly different to a neutral response? Please help...

    Hello I am working with a likert scale with response ranges from 1-5. A score of '3' indicates a neutral response. I want to calculate whether,...

    Started by gemma7‎, 10-05-2008 07:28 AM
    • Replies: 5
    • Views: 6,457
    10-06-2008, 07:40 PM Go to last post
  46. How to obtain individual factor scores after PCAs on multple imputed datsets???

    Hello, I really hope, someone here can help me, I've searched the internet for hours and could not get any clue on how to solve my problem. I...

    Started by marbar‎, 12-29-2011 08:24 AM
    • Replies: 14
    • Views: 6,445
    05-09-2015, 07:04 AM Go to last post
  47. Equivalent to RMSE for logistic regression?

    I understand that RMSE is a useful summary measure for assessing predictive power of regression model with continuous dependent Y. Is RMSE equally...

    Started by chipsens‎, 08-09-2011 09:58 AM
    prediction, rmse
    • Replies: 1
    • Views: 6,435
    08-09-2011, 10:54 AM Go to last post
  48. Variance estimation

    A simple question we have a random sample n=2 with X, Y drawn from a normal distribution N~(0, \sigma^2). Is V=\frac{X^2}{2}+\frac{Y^2}{2} a...

    Started by _joey‎, 10-31-2010 05:09 AM
    2 Pages
    1 2
    • Replies: 21
    • Views: 6,426
    11-01-2010, 06:42 AM Go to last post
  49. Does anybody have a calculus example for Bartlett and Levene tests?

    Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

    Started by quantster‎, 09-01-2010 02:54 PM
    • Replies: 14
    • Views: 6,389
    09-07-2010, 05:59 AM Go to last post
  50. Help correlating Likert scale data with demographic profile

    I'm not knowledgeable about statistics, so please excuse any mistakes in phrasing. Our professor is currently on leave, and I don't have anybody else...

    Started by violet‎, 10-12-2010 02:57 AM
    • Replies: 4
    • Views: 6,379
    10-12-2010, 10:20 PM Go to last post
  51. an event study? I can't stand. which way should I choose?

    Please a little help. There is an event. You can think a government interference . So, price of firms is decreased and therefore quantity of...

    Started by tiago2‎, 01-01-2011 07:12 AM
    • Replies: 3
    • Views: 6,344
    01-02-2011, 06:15 PM Go to last post
  52. Sample size for repeated measures or dependent-sample t

    Hi John: I have another question. I collected these data from parents and their children about children's chronic condition. I wanted 100...

    Started by Susanbwh‎, 02-18-2006 12:51 PM
    • Replies: 1
    • Views: 6,327
    02-18-2006, 02:27 PM Go to last post
  53. 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: 6,317
    05-24-2013, 11:26 AM Go to last post
  54. Interpret statistical data - Relative risk, power, and significance?

    "We estimated that a sample size of 1240 patients followed up for an average of 3 years would lead to detection of a 33% difference in the relative...

    Started by nana0709‎, 08-27-2010 08:14 AM
    • Replies: 4
    • Views: 6,244
    08-28-2010, 03:53 AM Go to last post
  55. testing rates through time

    Hello all, this seems like it should be a simple questions but our team cannot find an answer to the question. If I have data set up like the...

    Started by shanehall.m‎, 10-11-2011 09:31 AM
    2 Pages
    1 2
    proportion, rates, time series, trend
    • Replies: 18
    • Views: 6,210
    10-13-2011, 09:04 AM Go to last post
  56. Interactions in R and posthocs (lmer model)

    Hello there, here's a question about interactions. Let's just say you have the variables Diagnosis with two levels LI (language impaired) and N...

    Started by at474‎, 10-20-2009 02:18 PM
    • Replies: 1
    • Views: 6,208
    10-20-2009, 10:51 PM Go to last post
  57. Test for difference between ratio of means, unequal variance.

    Hello there, I an experimental design were I wish to test if the effect of a treatment on several subjects type is different to the effect of...

    Started by Sudders‎, 04-05-2011 04:01 PM
    • Replies: 5
    • Views: 6,202
    09-29-2015, 11:58 PM Go to last post
  58. Why does a model with an interaction has to include the interaction main effects?

    :wave: Hello fellow stats talkers, If we are only interested in an interaction, I was wondering why a model with a significant interaction also has...

    Started by at474‎, 10-22-2009 11:48 PM
    • Replies: 1
    • Views: 6,187
    11-11-2009, 08:52 AM Go to last post
  59. Red face Rolling or continuous surveying or sampling

    I have been looking everywhere for an answer to this problem, so far with no luck. Hopefully the statistics gurus on this board will know the...

    Started by jasoncs‎, 04-08-2011 06:50 AM
    sampling
    • Replies: 0
    • Views: 6,167
    04-08-2011, 06:50 AM Go to last post
  60. Youden Index

    Hello, I am doing some ROC analysis comparing grading scales for intracerebral hemorrhage. My question is - can the Youden Index be considered a...

    Started by sbruce44‎, 06-23-2010 02:51 PM
    • Replies: 0
    • Views: 6,131
    06-23-2010, 02:51 PM Go to last post

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