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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: 18,698
    10-11-2014, 12:02 PM Go to last post
  1. ¿Weighted moments references?

    Hi, I have a sample of frequencies and Sums(totals): Ni Si 23 12345 10 7800 ... Si is the sum over some variable X, measured...

    Started by uozz2‎, 04-14-2013 06:56 AM
    • Replies: 0
    • Views: 20,512
    04-14-2013, 06:56 AM Go to last post
  2. Question [[ Which stats test(s) for assessing relative weights using ranked (ordinal) data? ]]

    Hello forum, I've been mulling this problem over for a while and getting nowhere with it (generating more questions than answers) so I thought I'd...

    Started by kaia‎, 11-25-2012 09:48 AM
    • Replies: 0
    • Views: 1,680
    11-25-2012, 09:48 AM Go to last post
  3. [wilcoxon/paired t test] when to exclude data? Not normally distributed data.

    Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

    Started by LoudWhisper‎, 11-28-2015 05:01 AM
    • Replies: 1
    • Views: 1,333
    11-28-2015, 08:10 AM Go to last post
  4. [Statistica - Nested Anova] How to do a two-way nested anova?

    Hi, I'm trying to do a two-way nested anova in Statistica, but the results do not seen to be a two way model. In my study I need to compare if the...

    Started by Maria Costa‎, 07-14-2017 11:45 AM
    anova, anova ecology biology, anova statistica glm, neste anova, statistica
    • Replies: 0
    • Views: 225
    07-14-2017, 11:45 AM Go to last post
  5. [SPSS] Different sig. level with Two-way ANOVA vs. Independent T-test, Help!

    Hi, I am confused right now. I am a newbie for SPSS. The sig. level in independent t-test is different from in two-way ANOVA. Why is that? My...

    Started by mentalgoatmilk‎, 07-29-2012 05:56 PM
    • Replies: 0
    • Views: 1,371
    07-29-2012, 05:56 PM Go to last post
  6. Smile [SPSS - Hypothesis testing] Controlling for a variable. ANCOVA?

    Hi! I am using open data from New York City's yellow cabs and the in 2013 introduced citibikes (bikesharing service) to see if the introduction of...

    Started by dippedinice‎, 05-12-2016 03:18 PM
    hypothesis testing, spss
    • Replies: 0
    • Views: 646
    05-12-2016, 03:18 PM Go to last post
  7. [SAS] Compare predicted vs actual continuous [0,1] data

    Hello, I have predicted values for year and quarter that were calculated from a linear regression, and I also have actual values. I would like to...

    Started by kdk‎, 12-08-2015 05:13 PM
    actual values, comparison, predicted values, regression
    • Replies: 1
    • Views: 2,161
    12-08-2015, 08:01 PM Go to last post
  8. [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: 2,926
    07-12-2013, 03:55 PM Go to last post
  9. [R] Estimation of the emprical distribution

    Hi all, I was wondering if there's an R package online that automatically estimates the best distribution of my empirical data and gives the...

    Started by maaarten9‎, 04-27-2017 10:43 AM
    distribution, package
    • Replies: 2
    • Views: 734
    04-27-2017, 01:26 PM Go to last post
  10. [Multinomial Distribution] Help with applying Multinomial to a biological problem

    Hello all, I need help with a stats question I'm trying to solve for a biological question. http://en.wikipedia.org/wiki/Multinomial_distribution....

    Started by Wayne314‎, 08-12-2013 11:39 AM
    biology, cancer, multinomial, research question
    • Replies: 1
    • Views: 1,413
    08-12-2013, 11:49 AM Go to last post
  11. [help]interpretation needed please

    How would you interpret the regression result is good or not?> How would you interpret coefficient and ? Would you reject the hypothesis that...

    Started by numerospy‎, 11-15-2013 10:28 AM
    2 Pages
    1 2
    • Replies: 25
    • Views: 3,668
    11-20-2013, 02:43 AM Go to last post
  12. [Help] What is the statistical formula applied in this problem?

    Stat/Math wizs, if you could kindly shine your beacon on this problem. I'm running some statistics using a clustering algorithm and it classified...

    Started by psynpsyn‎, 05-13-2010 02:48 AM
    • Replies: 2
    • Views: 2,165
    05-14-2010, 11:15 PM Go to last post
  13. [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: 2,108
    09-07-2016, 09:09 AM Go to last post
  14. Post [ASK] [Quantification Theory Type I] Kansei Engineering Reference

    Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

    Started by Gema‎, 08-23-2014 12:44 AM
    • Replies: 1
    • Views: 3,229
    03-11-2015, 05:17 PM Go to last post
  15. [ask] estimate the word "precision" from statistical book by using cluster sampling

    hi everyone, i have been a task about how to estimate the word "precision" from statistical book by using cluster sampling. plz help me, i've been...

    Started by harris‎, 04-21-2013 11:50 PM
    • Replies: 3
    • Views: 1,669
    04-23-2013, 07:03 AM Go to last post
  16. [ANOVA - Repeated Measures] When to include subject as a random effect?

    I have an eye tracking study in which two groups of subjects (patient and control) are completing a face recognition task in which they learn a set...

    Started by ProfCorrow‎, 03-10-2017 12:26 PM
    random effect, repeated measures anova
    • Replies: 2
    • Views: 1,285
    04-11-2017, 12:00 PM Go to last post
  17. Zero vs missing data

    Hello I have a question regarding 0 (=zero) vs missing data. If I have an observation that have many variables but one of the variable is not...

    Started by Hedva‎, 08-28-2016 08:02 AM
    • Replies: 3
    • Views: 1,029
    08-29-2016, 03:12 AM Go to last post
  18. Zero Inflated LOGISTIC Regression?

    Hello all, I recently gave a presentation describing my use of logistic regression (YES/NO response variable) and someone suggested that because...

    Started by lancearmstrong1313‎, 12-19-2012 07:34 AM
    • Replies: 2
    • Views: 10,049
    12-19-2012, 09:09 AM Go to last post
  19. z-test rule.

    Hello, I am a new user in this forum. I am wondering whether I can use z-test for a small amount of data, Let us say, "English and Math marks" for...

    Started by littledic‎, 04-19-2011 12:04 PM
    • Replies: 5
    • Views: 4,284
    04-19-2011, 12:28 PM Go to last post
  20. Z-test for different proportions: why are they all sig. different?

    Hi all, so I am wondering what about my data is making all of my Z-tests for different proportions sig. different (and it says actual conf. level...

    Started by MarilynCM‎, 10-03-2010 11:31 AM
    • Replies: 5
    • Views: 5,297
    10-03-2010, 06:56 PM Go to last post
  21. Z-scores with non-normal data

    Hi, I am reviewing someone's study in which they used z-scores to standardize and compare data. I see no mention of their test for normality and...

    Started by budgie81‎, 06-06-2013 07:35 AM
    normal distribution, transformation, z score
    • Replies: 1
    • Views: 5,164
    06-06-2013, 07:46 AM Go to last post
  22. Yule Walker - AR(1) - Covariance Forumla

    Hello, I have the AR(1) process: Yt=phi*Yt-1 + et According to text books we ,ultiply by Yt-k, so we have: Yt*Yt-k=phi*Yt-1*Yt-k+et*Yt-k and...

    Started by zarasandreas‎, 10-01-2011 06:23 AM
    • Replies: 1
    • Views: 4,259
    10-01-2011, 11:22 AM Go to last post
  23. 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: 6,154
    06-23-2010, 02:51 PM Go to last post
  24. xtDPDsys postestimation

    Hi all I run two equations using xtdpdsys, the postestmation came as follows First equation estat sargan Sargan test of overidentifying...

    Started by momo‎, 03-19-2011 05:37 AM
    • Replies: 0
    • Views: 4,794
    03-19-2011, 05:37 AM Go to last post
  25. x-12-arima - Which model to choose ?

    Hi I'm working with some data. But it isn't a long series. In fact, it has 47obs. The data is on levels. So, i worked with the multiplicative...

    Started by jfca283‎, 03-14-2014 03:16 PM
    • Replies: 0
    • Views: 1,048
    03-14-2014, 03:16 PM Go to last post
  26. 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: 1,697
    01-04-2012, 07:24 PM Go to last post
  27. Writing equations for latent growth curve models

    Hi all, I'm a PhD student currently working on an independent research project using latent growth curve modeling. This is my first time using...

    Started by omnibus‎, 05-31-2013 02:01 PM
    equation query, latent growth curve, longitudinal data, parallel process model
    • Replies: 5
    • Views: 2,090
    06-01-2013, 02:11 PM Go to last post
  28. Thumbs up Would you help me? (Tranformations)

    Hi, I was looking for tranformations for ratio data. I find that arcsine tranformation is adecuate for that kind of data (ratio). For that...

    Started by sureño‎, 05-07-2012 07:50 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,303
    06-06-2012, 09:07 AM Go to last post
  29. 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: 2,785
    02-21-2009, 05:37 PM Go to last post
  30. 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: 7,076
    09-23-2010, 05:12 AM Go to last post
  31. Within-Subjects for categorical data

    Hello, I am struggling to find a suitable statistic test for one of my studies: I have 4 different conditions, and I want to test if my results...

    Started by JoniGuerrero‎, 09-12-2011 04:09 AM
    categorical, statistics, tests
    • Replies: 0
    • Views: 1,708
    09-12-2011, 04:09 AM Go to last post
  32. within-subject factor

    RQ: Is there an effect of the number of PEmax maneuvers on EMG amplitude? PEmax(within-subject factor: base, fatigue, rest), EMG amplitude...

    Started by eunkum1‎, 04-17-2014 10:23 AM
    • Replies: 0
    • Views: 876
    04-17-2014, 10:23 AM Go to last post
  33. Within Subjects OXO and confounds

    Greetings! I'm helping a friend in the medical field with his research and I have an I/O Psych background - meaning lots of regression and...

    Started by IOPsy‎, 06-11-2009 11:57 AM
    • Replies: 1
    • Views: 3,519
    07-19-2009, 09:33 PM Go to last post
  34. 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: 1,439
    04-04-2014, 09:56 PM Go to last post
  35. Within Subjects Analyses Advice

    Hi all, New user & first time poster. I'm finalizing my dissertation and am searching for similar examples as my project or some way to justify...

    Started by psychphd‎, 06-01-2017 07:12 PM
    repeated measures, repeated measures anova, within subjects
    • Replies: 0
    • Views: 888
    06-01-2017, 07:12 PM Go to last post
  36. Wilk s theorem and LR test

    Hello, I have first posted the following in the "Statistics help" section, but it might be that it is better to post it here. I have some...

    Started by Arkonis‎, 03-22-2012 11:19 AM
    • Replies: 2
    • Views: 3,634
    03-30-2012, 09:56 AM Go to last post
  37. 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: 9,067
    04-19-2013, 12:12 PM Go to last post
  38. Wilcoxon sign rank test and sample size

    In the Wilcoxon signed rank test, it uses the binomial distribution to calculate p-value for n<20. What would it use if greater/equal to 20?

    Started by hlsmith‎, 03-07-2016 01:50 PM
    • Replies: 2
    • Views: 2,095
    03-07-2016, 04:21 PM Go to last post
  39. Wilcoxon rank sum test on Cross Validation Results

    Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

    Started by gajan‎, 01-30-2012 04:30 AM
    cross validation, wilcoxon rank sum test
    • Replies: 2
    • Views: 2,556
    01-31-2012, 03:33 AM Go to last post
  40. Wilcoxon and Anova? Confused!

    HI! I'm really quite new to stats so I apologise for glaring foolishness :P Basically in the study that I'm looking at is a within-subjects...

    Started by confused.stats‎, 04-04-2014 06:50 AM
    • Replies: 0
    • Views: 1,933
    04-04-2014, 06:50 AM Go to last post
  41. Wilcoxon (SL) Regression - Confidence Intervals on Parameter Estimators?

    Does anyone know of a method to create confidence intervals on the SLR parameter estimates of a Wilcoxon Regression model?

    Started by Athenaeum‎, 05-24-2017 09:28 PM
    confidence, interval, regression, wilcoxon
    • Replies: 1
    • Views: 735
    05-24-2017, 09:47 PM Go to last post
  42. Wich data analysis to choose for my data?!

    Hello to everyone, I'm new on this forum and I thank the team for this site. Actually I'm working with some data and I don't know which can be the...

    Started by tsdl‎, 11-09-2012 07:47 PM
    • Replies: 5
    • Views: 1,771
    11-13-2012, 09:40 AM Go to last post
  43. 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: 7,259
    08-13-2012, 03:14 PM Go to last post
  44. Why use Chi-square?

    Hi, I am putting together a statistics course about inference techniques to use when the predictor variable(s) are categorical (by which I mean,...

    Started by Eugenie‎, 08-13-2012 09:33 AM
    chi squared, fisher exact test
    • Replies: 9
    • Views: 4,677
    08-15-2012, 01:58 PM Go to last post
  45. Why not go with tests dealing with unequal variances/unbalanced sample size first?

    Hi All, Here is the context: a lot of texts for hypothesis testing/ANOVA first examine the cases where either the number of samples per group are...

    Started by royk4444‎, 08-15-2013 08:51 PM
    anova, hypothesis testing, unbalanced data, unequal variance
    • Replies: 4
    • Views: 1,610
    08-16-2013, 02:56 AM Go to last post
  46. Why no international statistical testing?

    I am wondering why it's generally not done to conduct a statistical testing comparing prevalence rate between two different countries even they have...

    Started by Yellowknight888‎, 09-06-2009 04:15 PM
    • Replies: 3
    • Views: 2,388
    09-06-2009, 08:51 PM Go to last post
  47. Why does the following assumptions matter?

    When running an ANOVA we are told that certain assumptions of the test must be present for it to be applicable to the data. I never understood the...

    Started by feignfeign‎, 01-12-2017 07:24 PM
    • Replies: 0
    • Views: 1,791
    01-12-2017, 07:24 PM Go to last post
  48. Why does n and N values change when weighing by percent?

    I am weighting my survey during data analysis to equalize two groups within one variable. In order to get these two groups equal I weight one value...

    Started by asmith77559‎, 08-15-2012 02:43 PM
    • Replies: 0
    • Views: 1,307
    08-15-2012, 02:43 PM Go to last post
  49. Why does anyone bother to post questions here?

    A very large number have no answers. What's the point?

    Started by hcc‎, 06-02-2015 11:52 PM
    2 Pages
    1 2
    • Replies: 27
    • Views: 4,202
    06-05-2015, 05:18 AM Go to last post
  50. 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: 6,210
    11-11-2009, 08:52 AM Go to last post
  51. 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: 2,800
    10-19-2016, 06:45 PM Go to last post
  52. white test for heteroskedasticity

    Hi everyone In STATA, how to inerpret the results of the heteroskedasticity test? I typed in imtest, white to do the test, and got these results:...

    Started by Ali Ali‎, 09-15-2013 08:50 PM
    • Replies: 0
    • Views: 3,262
    09-15-2013, 08:50 PM Go to last post
  53. Which version of the Chi-Square test should I use?

    Hello, I am doing an honors project at my university. It is for my stat's class and due to the very short length of our class we did not cover the...

    Started by Aldin Malkoc‎, 11-09-2013 09:53 PM
    • Replies: 0
    • Views: 933
    11-09-2013, 09:53 PM Go to last post
  54. which type of ANOVA?

    N mineralisation is dependent variable. Management type (4 types) and position in valley (3 positions; nested in valley (with valley nested in...

    Started by Lolali‎, 12-18-2012 08:21 PM
    anova, factorial anova, nested anova, program r, repeated measures anova
    • Replies: 2
    • Views: 1,822
    12-19-2012, 07:35 AM Go to last post
  55. Question Which tests? Clarification plz!

    Hi all! I’m currently doing some research and I’m a bit of a novice so wanted to check if I was on the right lines with the statistical tests I’m...

    Started by Pippy‎, 08-14-2012 07:58 AM
    • Replies: 2
    • Views: 1,916
    08-17-2012, 01:18 PM Go to last post
  56. Which Tests?

    Hello! I am considering a study I'll note below, but have limited statistical experience. Accordingly I am seeking insights on which tests are...

    Started by zzehr‎, 08-02-2014 10:54 PM
    • Replies: 2
    • Views: 2,277
    08-03-2014, 10:56 PM Go to last post
  57. Which tests to use in these examples? Wilcoxon etc.

    I'm pretty clueless, but would appreciate any help very much. I have: Group 1: went from nothing, to receiving surgery 1, and then later on...

    Started by LasseNordenhem‎, 05-08-2017 06:05 AM
    mann whitney, non parametric tests, wilcoxon
    • Replies: 4
    • Views: 979
    05-08-2017, 07:40 AM Go to last post
  58. Which Tests to applicate for Trends?

    Hi everyone, it's christmas time again, which for me means, some free time :) During my free time I looked to acquire a bit more knowledge in some...

    Started by horror‎, 12-23-2015 08:42 AM
    • Replies: 2
    • Views: 1,450
    12-23-2015, 12:49 PM Go to last post
  59. Which tests do I have to use in order to test my hypotheses?

    Dear sir/madam, I would like to test these hypotheses, but I'm still not sure which test I should use for it. Can anybody help me? Thanks...

    Started by Nadia1908‎, 10-29-2012 10:27 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 3,837
    11-01-2012, 01:09 PM Go to last post
  60. Which test?

    I am trying desperately to figure out which test I should use. I want to test if self-efficacy survey results and/or internship opportunities result...

    Started by AMarbutt‎, 09-20-2014 04:52 PM
    • Replies: 1
    • Views: 1,915
    09-21-2014, 06:15 AM Go to last post

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