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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: 18,682
    10-11-2014, 12:02 PM Go to last post
  1. How do you convert yearly and period CPI to that of a rolling basis?

    Hi Guys, I am doing research and currently I am trying to utilize Consumer Price Index data. I have two sets of consumer price data, one that...

    Started by dannylimstata‎, 04-23-2012 04:35 AM
    • Replies: 0
    • Views: 1,013
    04-23-2012, 04:35 AM Go to last post
  2. 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: 4,992
    08-20-2011, 04:15 PM Go to last post
  3. Power

    Hi there, I need some help getting my head around this power concept. If there's a small but important effect, should you try and find it...

    Started by danony‎, 08-24-2011 06:25 PM
    • Replies: 9
    • Views: 2,409
    08-25-2011, 08:35 PM Go to last post
  4. Please help me with this question

    A company is interested in investing in companies in Hong Kong. They have access to large dataset on the rate of return on assets (expressed in...

    Started by danswe3‎, 03-27-2011 12:46 PM
    • Replies: 1
    • Views: 2,213
    03-27-2011, 01:14 PM Go to last post
  5. help me, i need some ideas for my dissertation

    Okay i am going to conduct a regression analysis to explain the variation in patents per capita across regions in China. I have done some...

    Started by danswe3‎, 03-30-2011 12:44 PM
    • Replies: 1
    • Views: 2,397
    03-30-2011, 06:24 PM Go to last post
  6. Rotation in Principal Components Analysis

    Hi, I was wondering if anybody could give me some general advice on a specific issue. Is it possible to orthogonally (varimax) rotate when...

    Started by DanWeaving‎, 01-08-2014 12:36 PM
    • Replies: 7
    • Views: 5,416
    01-14-2014, 08:18 AM Go to last post
  7. Which statistical test to use?

    Hi guys, I am posting to gain a bit of advice on which statistical test to use for our current research study. We are due to meet with our...

    Started by DanWeaving‎, 06-13-2014 08:52 AM
    • Replies: 1
    • Views: 1,115
    06-13-2014, 10:24 AM Go to last post
  8. Need help on normalizing data

    I have very limited knowledge on statistics, but I need to approach the following question, can any expert here show how to approach it? I have 2...

    Started by danyu‎, 12-15-2011 03:33 PM
    • Replies: 3
    • Views: 5,145
    12-15-2011, 04:17 PM Go to last post
  9. Smile what test to do?

    Hi Would be grateful for a little guidance. I have a set of data with a mix of continous and categorical data I am trying to see if there is...

    Started by daran‎, 05-23-2009 02:51 AM
    • Replies: 1
    • Views: 1,968
    05-24-2009, 03:05 PM Go to last post
  10. How to determine margin of error & power of a survey after completion of data collect

    We have conducted a telephone interview survey with a sample size nearer to nationally representative, then conducted the interview by calling...

    Started by Darsonikk‎, 06-01-2014 11:25 PM
    • Replies: 0
    • Views: 970
    06-01-2014, 11:25 PM Go to last post
  11. statistical test confius

    hii... any one need to help me... currently im doing research about pollution.. can any one suggest what test can i do since i using questinnaire...

    Started by daus90‎, 11-05-2015 10:42 AM
    • Replies: 3
    • Views: 1,347
    11-06-2015, 06:33 PM Go to last post
  12. Difference in coefficients between regressions?

    Hi - I'm looking for a way to test whether the beta coefficients are significantly different between two regression analyses. For example:...

    Started by dave25‎, 03-19-2009 11:37 PM
    • Replies: 1
    • Views: 10,266
    03-25-2009, 11:55 PM Go to last post
  13. Help with choosing statistics

    Hi! Stumbled over this forum recently, there's so much knowledge here I could just sit and read and read. Anyway, I'm not the strongest in stats so I...

    Started by Dave4‎, 08-29-2011 10:43 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,514
    11-22-2011, 12:09 AM Go to last post
  14. HELP: Using Data on Different Spatial Scales for Econometric Regressions

    *Background: Using a Production Function in form of Autoregressive Regression Model for Regional Perfomance* Hi, This question is more of a...

    Started by dave_123‎, 02-03-2017 03:06 AM
    dataset, econometric, regression, scale, spatial
    • Replies: 0
    • Views: 1,467
    02-03-2017, 03:06 AM Go to last post
  15. Relative aggression index - what's the best way to compose it?

    I study the international conflicts, and there is a dataset where all the official actions of one state towards another are registered. They are of...

    Started by David Pekker‎, 09-22-2014 09:23 AM
    • Replies: 0
    • Views: 1,630
    09-22-2014, 09:23 AM Go to last post
  16. Paramedic Research - Need help!

    Hello all, I have come across your forum after trying to source some statistic knowledge. I am currently planning a research project which I am...

    Started by davies2201‎, 12-07-2013 10:32 AM
    • Replies: 6
    • Views: 1,297
    12-08-2013, 11:26 AM Go to last post
  17. Using a t test not giving me what I want

    Good afternoon all, I'm writing a procedure to simply identify if 2 values are significantly different enough to update the procedure. As an...

    Started by davisd39‎, 08-23-2013 12:11 PM
    • Replies: 11
    • Views: 1,669
    08-28-2013, 06:27 AM Go to last post
  18. KL Divergence - What does the double bar notation mean?

    Hi, Kullback-Leibler divergence tends to be written as D_KL(P||Q), where P is a true probability distribution of random variable x and Q is a...

    Started by davuk‎, 07-31-2012 09:41 AM
    • Replies: 0
    • Views: 1,542
    07-31-2012, 09:41 AM Go to last post
  19. How to calculate significant differences in correlation using stata/spss

    Hello, This is probably a fairly simple question but I don't know to handle it properly. I have monthly data of 2 categories. Each category...

    Started by daydreamer‎, 05-22-2015 11:53 AM
    • Replies: 1
    • Views: 780
    05-23-2015, 03:47 AM Go to last post
  20. Help with t-test data analysis

    Hi everyone, I am a bit lost when it comes to stats, having only had a tiny amount of it so far. In my biology class we are writing a paper on if...

    Started by dbaker‎, 03-23-2011 07:31 PM
    • Replies: 3
    • Views: 3,220
    04-05-2011, 05:19 AM Go to last post
  21. Should I be using a MANOVA?

    Hi all, I apologise in advance if I explain this poorly - this is all somewhat new to me. I'm currently doing a small piece of classroom research...

    Started by dbang‎, 12-28-2015 01:40 AM
    • Replies: 7
    • Views: 1,218
    12-29-2015, 06:40 AM Go to last post
  22. Question about working with longitudinal data and z scores

    I was hoping someone could help me or point me in the right direction. The outcome variable for my study will be change in math scores over 3 years....

    Started by DBAske‎, 02-12-2013 04:52 PM
    longitudinal data, z scores
    • Replies: 0
    • Views: 1,486
    02-12-2013, 04:52 PM Go to last post
  23. Sample size | Johnson SB distribution

    I have some statistical notions but from one day to the other i was asked to do an analysis that i hope you guys can help me with, since i have no...

    Started by DBCM‎, 01-07-2014 09:28 AM
    • Replies: 1
    • Views: 2,340
    01-07-2014, 09:55 AM Go to last post
  24. Kaplan Meier and Log Rank

    Hi all, I am doing cognitive testing and the subjects have 20 possible trials to reach criterion (90% accuracy). In my spreadsheet, I have it laid...

    Started by dbh21486‎, 12-05-2013 09:41 AM
    • Replies: 0
    • Views: 976
    12-05-2013, 09:41 AM Go to last post
  25. Smile Is Wilcoxon Sign Rank the appropriate test?

    Hi - could anyone help me with this please? I am trying to choose the best statistical test for a problem I have - I am looking at rainfall...

    Started by dbjones1988‎, 12-20-2013 04:04 PM
    wilcoxon signed-rank test
    • Replies: 1
    • Views: 1,236
    12-20-2013, 04:39 PM Go to last post
  26. test which of two models is better predictor -- but the two are correlated with each

    Dear All -- Can anyone please please help me? I have a dichotomous dependent variable Y There are two alternative models for predicting Y The...

    Started by dbodoff‎, 06-22-2011 09:45 PM
    • Replies: 6
    • Views: 3,480
    09-02-2011, 06:46 PM Go to last post
  27. Repeated measure project.....which test?

    I am doing a project where I give subjects nicotine gum to chew for 30 minutes and then test them. They come in for a total of 2 visits. They either...

    Started by dcnaser‎, 12-04-2010 04:43 PM
    • Replies: 0
    • Views: 1,700
    12-04-2010, 04:43 PM Go to last post
  28. Significance test for 13 dichotomous DVs?

    I am studying unprofessional conduct. I have every case of misconduct over a 5-year period. I am curious if misconduct varies by education level. ...

    Started by ddb01‎, 02-18-2016 12:34 PM
    binary dependent variable, chi sq, cochran's q test, non parametric, significance test
    • Replies: 0
    • Views: 1,252
    02-18-2016, 12:34 PM Go to last post
  29. insufficient residual degrees of freedom

    What should I do when my SPSS output cannot produce multivariate test statistics because of insufficient residual degrees of freedom, and therefore...

    Started by ddlamb‎, 03-21-2012 06:07 PM
    • Replies: 1
    • Views: 7,350
    03-21-2012, 06:20 PM Go to last post
  30. try this for kicks...

    Hi everyone! First post for me. I think this might be a bit tricky, but i would really appreciate some help (go figure..). I recently got...

    Started by deadrabbit‎, 06-11-2010 07:16 AM
    • Replies: 2
    • Views: 1,992
    06-12-2010, 03:04 AM Go to last post
  31. alternative to anova

    What is an alternative statistical test to anova. I have a large varience between three groups (control and two experimental). How can I determine...

    Started by deardirestraits‎, 12-15-2011 03:37 PM
    • Replies: 10
    • Views: 5,457
    12-16-2011, 09:43 PM Go to last post
  32. Spearman's Rank Correlation P value on Minitab

    Hi there, im doing a project on the relationship between plant height and their nearest neighbour. As i couldn't normalise the data i've opted to use...

    Started by Debaser‎, 02-29-2012 08:50 AM
    minitab, p value, spearman's rank
    • Replies: 0
    • Views: 3,841
    02-29-2012, 08:50 AM Go to last post
  33. Smile reliability and pilot testing...losing plot!

    Hi All I have modified an exisiting survey, added more questions. I have two separate scaleswithin this measuring different constructs, the rest...

    Started by Deborah Redmond‎, 12-06-2011 11:58 PM
    • Replies: 8
    • Views: 3,469
    12-08-2011, 03:19 PM Go to last post
  34. Seeking help for the interpretation of model fit indices

    Hi everyone... Please help me with the following question I'm doing my research that one of it aims is to test the model fit of a particular model....

    Started by deden‎, 08-16-2015 07:25 AM
    chi square, gfi, interpretation, model fit indices, sem
    • Replies: 0
    • Views: 1,014
    08-16-2015, 07:25 AM Go to last post
  35. Repeated Measures ANOVA or Linear Mixed Effects?

    Hey Statisticians! I have a bit of a conundrum. I have a 2x3 model with factors Drug (E0,E1) and Music (No Music 1, Music, No Music 2). I have...

    Started by DeDw‎, 09-04-2017 10:24 AM
    • Replies: 0
    • Views: 221
    09-04-2017, 10:24 AM Go to last post
  36. which statistical test to use - Observed difference in outcome is due to chance?

    Hi, I have results from two very sensitive but different lab test trying to find pathogen in a patient sample. For some patients, results from two...

    Started by deepbiomed‎, 11-03-2016 08:49 PM
    • Replies: 12
    • Views: 3,661
    11-06-2016, 08:07 PM Go to last post
  37. interaction

    I have found a model to be significant for the effect of 4 IVs (two continuous and two dichotomous) on a continuous DV but none of the IVs show...

    Started by Deirdre‎, 01-18-2011 09:13 AM
    • Replies: 2
    • Views: 2,862
    02-07-2011, 10:17 PM Go to last post
  38. How many subsamples from large sample should I draw?

    Hi, I am working on an analysis where I compare 2 different samples, one Dutch and one US sample. The US sample is bigger than the Dutch sample...

    Started by Delforterie‎, 12-11-2012 09:17 AM
    • Replies: 3
    • Views: 1,629
    12-14-2012, 05:24 AM Go to last post
  39. Comparing deaths with reportings

    Hi. For my dissertation I am looking at how "Superbugs" are represented in the Media, and how the media's portrayal of them has caused some...

    Started by dellmarie88‎, 02-21-2009 02:10 PM
    • Replies: 0
    • Views: 1,964
    02-21-2009, 02:10 PM Go to last post
  40. 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: 6,331
    05-24-2013, 11:26 AM Go to last post
  41. Ordinal data analysis and hypothesis testing

    Hello, I have been working on a survey analysis and have to test hypothesis if the specified kind of software resulted in increased performance of...

    Started by DenisD‎, 04-10-2013 06:49 AM
    • Replies: 3
    • Views: 3,322
    04-10-2013, 10:56 AM Go to last post

    Within the firm I work for the question exists whether there are common characteristics within (between) more or less 900 cases/dossiers which we...

    Started by dennishoogeboom‎, 05-18-2009 05:05 AM
    • Replies: 4
    • Views: 3,091
    05-27-2009, 08:39 PM Go to last post
  43. I'm working for the plaintiff

    Plaintiff is Mike. Pat collected Mike's oil royalties for 16 years and won't disgorge them - he's ditched his bank records and won't make an...

    Started by dennism‎, 03-25-2012 11:28 AM
    • Replies: 4
    • Views: 1,745
    03-26-2012, 09:57 PM Go to last post
  44. Before/after surgery comparison

    Hi! I am currently doing experiments on song birds looking at pre- and post surgery data. I have 10 male birds each singing at least 100 songs both...

    Started by denstat‎, 01-22-2014 09:43 AM
    • Replies: 7
    • Views: 1,432
    02-04-2014, 09:20 AM Go to last post
  45. Limit of standard normal CDF(x) as x goes to ∞?

    Let N:\mathbb{R} \to be the CDF of the standard normal density function. I want to evaluate: \lim_{b\to 0^+} N(\frac{a}{b}). Clearly this is...

    Started by derksheng‎, 10-15-2012 10:32 PM
    • Replies: 12
    • Views: 95,025
    10-18-2012, 09:39 AM Go to last post
  46. What are all the research areas with a core focus on time series applications?

    I want to do an applied time series research paper outside of finance/economics. My question to you guys is what are all the areas where applied time...

    Started by derksheng‎, 01-12-2013 12:30 PM
    • Replies: 0
    • Views: 1,137
    01-12-2013, 12:30 PM Go to last post
  47. Homogenity and Heterogenity

    Hello everyone. I have read that Homogenity and Heterogenity are used for population that have/do not have accordingly the same variance σ^2. Does...

    Started by dervast‎, 05-06-2010 10:29 AM
    • Replies: 1
    • Views: 2,689
    05-08-2010, 01:09 AM Go to last post
  48. S.t.d Calculation of different populations

    Hello. I have n different populations with their means and their standard deviations. All these different populations follow the Gaussian...

    Started by dervast‎, 05-13-2010 11:16 AM
    • Replies: 5
    • Views: 3,219
    05-18-2010, 08:36 AM Go to last post
  49. Confimation/Rejection of proposed theoretical model hypotheses?

    Hi, I have conducted a CFA using AMOS software and now at the stage where I have to confirm or reject the hypotheses addressed by my research...

    Started by deto4ka‎, 04-19-2013 02:38 PM
    • Replies: 0
    • Views: 1,295
    04-19-2013, 02:38 PM Go to last post
  50. Need help in hypotheses testing. Interpretation of AMOS output

    Hi, I am struggling to understand how to test the hypothesized relationships in my model. I've got 4 hypotheses to test, all 4 are hypothesized...

    Started by deto4ka‎, 04-27-2013 07:42 AM
    • Replies: 10
    • Views: 2,703
    04-28-2013, 06:29 AM Go to last post
  51. Hypotheses testing in CFA.

    Hi, I am struggling to understand, how support/reject the hypotheses addressed by my research model. I have conducted a second order CFA and...

    Started by deto4ka‎, 04-24-2013 01:30 PM
    • Replies: 4
    • Views: 1,475
    04-24-2013, 03:27 PM Go to last post
  52. Discriminant validity issues. Can this be improved?

    Hi, I have some issues with my discriminant validity, as some of the factor variance correlations are greater than the Average Variance Extracted....

    Started by deto4ka‎, 05-04-2013 10:51 AM
    • Replies: 0
    • Views: 1,247
    05-04-2013, 10:51 AM Go to last post
  53. Hypotheses Testing in Amos (reading output). Help

    Hi, Could someone please advise, whether the hypothesized relationships are supported given the output attached? From my understanding - non of...

    Started by deto4ka‎, 05-05-2013 03:50 PM
    • Replies: 0
    • Views: 2,043
    05-05-2013, 03:50 PM Go to last post
  54. Constucting ARMA realizations

    Given estimates for the AR and MA coefficients for an ARMA(p,q) model with a non zero mean, how do I construct a realization of the time series? ...

    Started by devlynn167‎, 06-11-2008 10:26 AM
    • Replies: 0
    • Views: 2,878
    06-11-2008, 10:26 AM Go to last post
  55. Likelihood Ratio Test for general hypotheses

    Hi, The original paper (Wilks, 1938) describing the Likelihood Ratio Test considers a null hypothesis stating that a subset of the parameters from...

    Started by dfirka‎, 02-14-2011 01:29 PM
    likelihood ratio test
    • Replies: 2
    • Views: 5,875
    02-17-2011, 07:54 AM Go to last post
  56. How to Analyze this data?

    OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

    Started by DFoley‎, 10-03-2011 06:02 PM
    • Replies: 7
    • Views: 3,145
    10-05-2011, 11:38 AM Go to last post
  57. Not sure what statistical test to use

    Hello: I have a couple of questions regarding what statistical test I should choose. Any help on this would be greatly appreciated! Break down on...

    Started by Dgs878‎, 08-05-2015 09:24 AM
    • Replies: 0
    • Views: 1,566
    08-05-2015, 09:24 AM Go to last post
  58. help needed (PLEASE) on which statistical analysis to use

    I am looking at the relationship between attachment in childhood and attachment in adult relationships. Attachment in childhood has been measured...

    Started by dgullis‎, 11-22-2013 03:17 PM
    • Replies: 0
    • Views: 1,340
    11-22-2013, 03:17 PM Go to last post
  59. vibration signal_prediction

    Hello, I have a vibration data coming from a motor. i am using R program to do the predictive analysis. My vibration data is a white noise (mean and...

    Started by dhivya‎, 08-28-2017 12:58 AM
    • Replies: 1
    • Views: 247
    08-28-2017, 02:23 PM Go to last post
  60. statistical inference in materials science

    Hi all, I'm currently doing a quick study into a material where grain size could potentially affect a desired property Y, but I'm uncertain about...

    Started by dhvd90‎, 03-07-2017 12:17 PM
    • Replies: 0
    • Views: 1,106
    03-07-2017, 12:17 PM Go to last post

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