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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: 18,746
    10-11-2014, 12:02 PM Go to last post
  1. Variance Inflation Factor

    Hej, I am checking for multicollinearity. And I cant find on the web when having the outpur from R commander, on which I have to look to identify...

    Started by MasterStudent‎, 03-10-2016 08:03 AM
    vif
    • Replies: 10
    • Views: 5,032
    10-02-2016, 06:38 PM Go to last post
  2. 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: 5,031
    05-09-2009, 07:40 PM Go to last post
  3. Accelerated Bootstrap - mediation

    Howdy! :tup: Can anyone explain accelerated bootstrap to me? I've got it reported in a research report and I can't really figure it out. ...

    Started by danony‎, 08-20-2011 05:01 AM
    • Replies: 2
    • Views: 5,025
    08-20-2011, 04:15 PM Go to last post
  4. T-Test: How large is large?

    I'm doing some research, I collected data from two different groups, 80 samples in each group. The data is borderline for normality. I've read on...

    Started by drekhan‎, 12-17-2009 04:24 PM
    • Replies: 1
    • Views: 5,001
    12-18-2009, 03:14 AM Go to last post
  5. statistics calculator to adjust for design effect

    Hi there, I'd like to know if anyone could tell me of a stats calculator that can adjust means and confidence intervals of analyses (paired-t and...

    Started by psychomania85‎, 06-29-2010 03:48 AM
    • Replies: 1
    • Views: 4,990
    07-01-2010, 02:41 PM Go to last post
  6. Strict and Weak Stationarity Tests

    Hello, As far as i know stationarity can be characterized as weak and strict. The most well known test for stationarity are Dickey Fuller,...

    Started by zarasandreas‎, 11-06-2011 06:18 AM
    • Replies: 2
    • Views: 4,989
    11-06-2011, 06:24 PM Go to last post
  7. item-scale correlation

    Hi, When running an item-scale correlation, what does it mean when research have corrected for overlap? Is there a way to do this in SAS?

    Started by proc1125‎, 10-02-2014 04:49 PM
    • Replies: 13
    • Views: 4,958
    10-21-2014, 12:19 PM Go to last post
  8. How to generate an autocorrelated random variable?

    Hi, I know I can generate two correlated random variables x1 an x2 using x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal...

    Started by consuli‎, 03-04-2015 05:06 PM
    2 Pages
    1 2
    autocorrelation
    • Replies: 15
    • Views: 4,958
    03-11-2015, 01:08 PM Go to last post
  9. Longitudinal analysis and the independence assumption

    This is a bit of a long one, but I would really appreciate some help with it. I have a long list of data which describes whether a violent...

    Started by Alley_Cat‎, 01-30-2009 12:45 PM
    • Replies: 9
    • Views: 4,954
    11-13-2011, 05:14 PM Go to last post
  10. Cross sectional T-test, event-study

    Hello, I'm new to the forum and I have tried searching for it but couldn't quite find my solution. I'm working on a paper involving an Event study...

    Started by Menthol‎, 01-27-2014 07:09 PM
    • Replies: 0
    • Views: 4,949
    01-27-2014, 07:09 PM Go to last post
  11. 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
  12. In dire need of help!

    I took Stats 1 3.5 years ago and somehow the college forgot to mention i needed stats 2 to graduate and am now in it. I AM SO LOST and I have a...

    Started by JeremiahC‎, 01-26-2012 09:40 PM
    • Replies: 3
    • Views: 4,926
    01-27-2012, 05:01 AM Go to last post
  13. studying half-hourly time series

    hello, I have to study a time serie composed of half-hourly data concerning electric load for the period of 6 years : so in my file data i have...

    Started by maryo‎, 02-21-2009 05:23 AM
    • Replies: 5
    • Views: 4,907
    02-24-2009, 03:05 AM Go to last post
  14. 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: 4,906
    10-14-2009, 12:43 PM Go to last post
  15. Best design for this experiment?

    Hello all. I am having some trouble with my experiment and would be the best way to analyze the data. I have 4 different chemicals each at one...

    Started by daelve‎, 08-25-2011 07:08 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 4,906
    08-26-2011, 04:55 PM Go to last post
  16. Infinite divisibility under mixing - kernel density estimation

    Hi all, Can we consider a (multi-modal) kernel density estimate as a finite mixture of probabiliy distributions which would be infinite divisible?...

    Started by Cluster‎, 08-15-2008 12:15 PM
    • Replies: 3
    • Views: 4,874
    08-18-2008, 12:07 PM Go to last post
  17. Mixed positive and negative correlations in a mediation model

    Can you offer any potential explanations for the following: Significant positive correlations between A and B, & B and C, but a significant negative...

    Started by pumpkinpatch‎, 11-20-2010 04:08 PM
    • Replies: 0
    • Views: 4,864
    11-20-2010, 04:08 PM Go to last post
  18. interval censored data using bootstrap method

    I have time Xi that is interval censored and the data consist of time intervals Ii = such that Xi is within Ii , Ri>Li, i=1,...,96 My interest is...

    Started by zzzc‎, 03-16-2011 08:35 PM
    • Replies: 2
    • Views: 4,852
    03-29-2011, 09:09 PM Go to last post
  19. 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: 4,823
    03-19-2011, 05:37 AM Go to last post
  20. Question re: maximum observation value falling in third quartile

    :wave: You all have been my saviors in the past whenever I've been stuck with my stats. I need to figure how I interpret the fourth quartile...

    Started by Veronica‎, 12-14-2010 04:00 PM
    • Replies: 4
    • Views: 4,816
    12-16-2010, 10:23 AM Go to last post
  21. No collinearity between dependent and exogenous variables - Implicatrions

    I'm trying to test for autocorrelation in the residuals of an AR(p) model. The stata output is: "the exogenous variables may not be collinear with...

    Started by Pierre‎, 05-04-2013 11:54 AM
    autocorrelation, autoregressive, model, residuals
    • Replies: 0
    • Views: 4,811
    05-04-2013, 11:54 AM Go to last post
  22. PCA latent variables

    For exploratory purposes, should PCA (Principal Component Analysis) be done for one latent variable at a time or should it done for all the latent...

    Started by rajarshic‎, 04-25-2011 10:59 AM
    latent construct, latent variable, pca
    • Replies: 3
    • Views: 4,808
    04-25-2011, 09:33 PM Go to last post
  23. 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: 4,801
    01-21-2013, 11:33 PM Go to last post
  24. Question Anova

    Develop two-null hypothesis tests to ascertain if there are any statistical variances in the averages of bus route times and any statistical variance...

    Started by tyrankj‎, 09-02-2008 12:20 AM
    • Replies: 2
    • Views: 4,792
    09-02-2008, 03:38 AM Go to last post
  25. Is online survey random? How to make it random?

    Hi there, I want to conduct an online survey. I know that by default only some users would be included. How to increase randomness? Thank you.

    Started by Sylviastat‎, 12-22-2010 02:15 AM
    • Replies: 2
    • Views: 4,787
    12-25-2010, 06:14 AM Go to last post
  26. Calculating weighted mean & SD from multiple group data

    I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

    Started by asf‎, 11-19-2012 08:50 PM
    • Replies: 2
    • Views: 4,773
    11-21-2012, 07:47 PM Go to last post
  27. Can I use standard deviation in Likert scale (1-7) data with non normal distribution?

    I have 20 questions, each divided in 6 Likert scale items (1-7), representing 6 different values like Success, Oportunity, etc. The sample is rather...

    Started by nikospss‎, 12-27-2012 04:23 AM
    likert nonparametric
    • Replies: 3
    • Views: 4,772
    12-31-2012, 05:39 PM Go to last post
  28. Complementary log log

    Hi I have a model with a binomial error distribution. Instead of the logit link I use the complementary log log. What is the interpretation of...

    Started by hen666‎, 02-12-2009 01:24 PM
    • Replies: 1
    • Views: 4,771
    02-12-2009, 04:09 PM Go to last post
  29. Comparison of the power of the tests: Parametric test versus Non-parametric test

    How can one compare using a simple experimentation or simulation whether a parametric test (e.g. t-test) is more powerful than its non-parametric...

    Started by imjae2‎, 08-26-2012 11:09 AM
    monte carlo, non-parametric test, parametric, simulation, statistical power
    • Replies: 6
    • Views: 4,764
    08-26-2012, 04:23 PM Go to last post
  30. Correlation Between Unpaired Data?

    What type of statistics compares or finds correlation of unpaired data? I'm assuming an XY scatter plot wouldn't work. I'm also assuming a t-test or...

    Started by odessa‎, 08-27-2013 09:58 AM
    correlation, ttest, unpaired data
    • Replies: 4
    • Views: 4,725
    08-27-2013, 12:15 PM Go to last post
  31. Tails and QQ Plot

    Does Anybody know if exists a formal proof about the well known properties of the qq plot? "families of symmetrical distributions with tails heavier...

    Started by Malacorda‎, 08-31-2011 08:42 AM
    • Replies: 0
    • Views: 4,722
    08-31-2011, 08:42 AM Go to last post
  32. Repeated Measures with a baseline Covariate

    I am in the final stages (i.e., manuscript is due on July 21) of my dissertation and I am stuck on what seemed to be a minor stats issue. This issue...

    Started by jennifer.r.daniels‎, 07-06-2009 02:46 PM
    • Replies: 0
    • Views: 4,721
    07-06-2009, 02:46 PM Go to last post
  33. Jackknife

    I tried to find a specific example of an application of the 'jackknife' command on google, but didn't find any so far. Someone has one? For...

    Started by hfwd‎, 02-28-2009 10:14 AM
    • Replies: 2
    • Views: 4,717
    03-15-2009, 10:11 AM Go to last post
  34. Difference between DBLIM and distance-based redundancy analysis???

    Hey there statistical wizards, I have been conducting some statistics using Primer on some ecological data incorporating environmental...

    Started by mycelialgroove‎, 07-17-2011 11:27 AM
    • Replies: 1
    • Views: 4,717
    07-17-2011, 06:07 PM Go to last post
  35. Statistical question about roulette

    I was wondering if anyone could help me with a statistics question I have? It would be great if anyone could look at this one. It is based on...

    Started by sbsx2‎, 06-13-2011 08:45 AM
    • Replies: 5
    • Views: 4,710
    06-13-2011, 04:37 PM Go to last post
  36. Red face DF in Repeated Measures ANOVA

    Hi all! :wave: In advance: thank you to all those who take the time to even read this post, as well as answer it: Additional to my sunfish study...

    Started by sms16‎, 02-08-2011 12:23 AM
    degrees of feedom, proc mixed, sas
    • Replies: 0
    • Views: 4,703
    02-08-2011, 12:23 AM Go to last post
  37. 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: 4,686
    08-15-2012, 01:58 PM Go to last post
  38. Urgent, which test can I use to test this hypothesis???

    Hi all, please help me I am stuggling doing my data analysis of my poject and my supevisor is on holiday but I have to finish all the ananlysis in...

    Started by nane‎, 07-17-2011 09:47 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,684
    07-17-2011, 05:16 PM Go to last post
  39. 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: 4,684
    03-13-2014, 09:16 AM Go to last post
  40. Repeated measures ancova

    Hi I am very stuck does anyone know how to run a repeated measures ancova in spss please!!!!

    Started by Rich D‎, 06-09-2010 02:45 PM
    • Replies: 1
    • Views: 4,680
    06-09-2010, 05:19 PM Go to last post
  41. Dichotomous data...

    Could you tell me if you can use ANOVAs on dichotomous data (specifically "yes" / "no") responses? If not, what other options do you have if your...

    Started by nogoodatstats‎, 08-20-2009 03:25 PM
    • Replies: 1
    • Views: 4,675
    08-21-2009, 01:41 PM Go to last post
  42. Help needed - estimating effect size

    Hi everyone, I'd really appreciate any help/guidance in solving a little problem of mine. I need to know how to estimate an effect size...

    Started by that_guy_‎, 08-01-2008 12:13 PM
    • Replies: 3
    • Views: 4,674
    08-05-2008, 02:00 PM Go to last post
  43. Need some help choosing correct statistical method for study

    Hi. I'm about to carry out a study and require suitable statistical method(s) for it. I plan to measure the effect of fluoridation on the growth of...

    Started by rwws22‎, 03-26-2011 10:09 PM
    • Replies: 2
    • Views: 4,674
    03-27-2011, 02:56 AM Go to last post
  44. 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: 4,663
    02-27-2013, 08:46 PM Go to last post
  45. Meaning for variants of Standard Deviation

    Could someone explain the meaning of the following: 1. More than 3 SD? 2. Less than 3SD but more than 2 SD? 3. Less than 2SD but more than 1 SD?...

    Started by King_Junior‎, 09-18-2009 12:06 AM
    • Replies: 0
    • Views: 4,657
    09-18-2009, 12:06 AM Go to last post
  46. Calculating abnormal returns with the calendar time portfolio approach

    Hey guys, I want to conduct an event study and since there is a lot of overlapping of the observation windows, I want to use the calendar time...

    Started by carlos_eduardo‎, 09-20-2013 03:19 AM
    • Replies: 0
    • Views: 4,649
    09-20-2013, 03:19 AM Go to last post
  47. Project ideas

    Hello guys and girls, In our coursework programme we will be asked to complete 2 industry projects each 25-30 pages long. There is a great number...

    Started by _joey‎, 11-28-2010 06:07 AM
    • Replies: 0
    • Views: 4,644
    11-28-2010, 06:07 AM Go to last post
  48. Help Anova

    hi everyone, I currently try to find an open source C/C++statistical library. Basically, I want to calculate the p and F value from oneway (or N...

    Started by 02020954‎, 12-12-2005 07:11 PM
    • Replies: 11
    • Views: 4,639
    12-14-2005, 05:55 PM Go to last post
  49. Feedback on bootstrapping effect size and t-values

    I am trying to learn to bootstrap per conversation here the other day. I know there are packages to bootstrap but wanted to process more...

    Started by trinker‎, 04-28-2015 01:07 PM
    3 Pages
    1 2 3
    • Replies: 31
    • Views: 4,639
    04-28-2015, 09:25 PM Go to last post
  50. Minimum sample size for calculation of guttamns lower bounds?

    Hi there, I am in the process of assessing the internal consistency of two tests, test A & B. Both tests are measuring the same thing so I am...

    Started by BOAZ‎, 10-11-2011 06:31 AM
    conbach's alpha, guttman's lower bounds, internal consistency, reliability, split half
    • Replies: 3
    • Views: 4,632
    10-11-2011, 07:37 PM Go to last post
  51. Structural Equation Modeling: When and why do you use Z-scores instead of Mean.

    Hi. Can anyone help me answer the question why some people who do SEM use z-scores as opposed to using mean scores? (articles and books are...

    Started by dmorga‎, 01-15-2015 03:13 AM
    sem, z-scores
    • Replies: 4
    • Views: 4,631
    01-15-2015, 11:27 AM Go to last post
  52. 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
  53. Significance of Correspondence Analysis clusterings

    Dear All, I would like to ask you about Correspondence Analysis. I am wondering if does any strategy exist to test the significance of the...

    Started by gianmarco‎, 12-30-2009 01:28 PM
    • Replies: 4
    • Views: 4,614
    01-03-2010, 02:27 AM Go to last post
  54. Calculate SD from mean and 95% CI

    Dear Friends I'm reading a paper that has the following table: Year, n, measure (SD) 2008, 536 0.25 (0.13) 2010, 536 0.21...

    Started by SiBorg‎, 10-03-2012 03:58 PM
    • Replies: 7
    • Views: 4,611
    10-03-2012, 06:31 PM Go to last post
  55. State the null and alternative hypothesis

    Dear all, Can someone please give me some advise on this one? I need to state the Ho en Ha hypothesis, I know how to do it in words but not in the...

    Started by Micheller‎, 11-12-2014 12:49 PM
    • Replies: 5
    • Views: 4,597
    11-16-2014, 01:09 PM Go to last post
  56. low coefficient alpha

    Hello, I have a question about coefficient alpha. How does having a low alpha effect your statistical tests if you are running say an ANOVA or a...

    Started by psychologygirl‎, 05-19-2009 11:19 AM
    • Replies: 0
    • Views: 4,585
    05-19-2009, 11:19 AM Go to last post
  57. How do t-test when I normalize one of the data sets?

    Hi everyone! I have three proteins, let's call them A B & C. B and C are mutated forms of A. I test the activity of A B & C three times....

    Started by joppe‎, 10-30-2012 06:03 PM
    • Replies: 0
    • Views: 4,580
    10-30-2012, 06:03 PM Go to last post
  58. Lightbulb Obtaining Residuals in Chi Square Goodness of Fit

    Another question re: goodness of fit testing, Is the procedure for obtaining standardized residuals the same ? The PhD student who leads the...

    Started by Fred‎, 04-27-2009 11:13 AM
    • Replies: 4
    • Views: 4,572
    04-28-2009, 11:01 AM Go to last post
  59. minimum data points for the K-s test for normality

    Dear all I have 6 points of data that i need to test for normality. is this enough to use the K-s test? what is the advised minimum for this test?...

    Started by yoma819‎, 08-18-2010 04:45 PM
    • Replies: 0
    • Views: 4,572
    08-18-2010, 04:45 PM Go to last post
  60. Which Anova to use???

    Okay. So I've read tons of books on this and none of them seem to give me a clear answer so here goes. I have 40 subjects. Each will be randomly...

    Started by kyle_genner‎, 01-15-2011 01:20 PM
    • Replies: 2
    • Views: 4,570
    01-31-2011, 03:01 AM Go to last post

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