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Threads 1981 to 2040 of 3195

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: 18,790
    10-11-2014, 12:02 PM Go to last post
  1. Chi sqared test or fisher exact test?

    Hi, I am doind research on different treatments to a disease. I broke down the categories into different age groups, i.e. 5-10,11-15,16-20 etc. and...

    Started by bullethead05‎, 04-10-2012 04:35 PM
    • Replies: 4
    • Views: 2,250
    04-10-2012, 07:13 PM Go to last post
  2. Analysis of Covariance

    Hi everyone, I would like to ask a question about the type of scale (e.g. categorical , continues variable) that should be use as a covariate. I...

    Started by ghada8888‎, 04-10-2012 10:08 AM
    • Replies: 0
    • Views: 1,032
    04-10-2012, 10:08 AM Go to last post
  3. Counter-intuitive results with Bold-Brunell panel data estimator (DV-INDEX)

    Hi All, I am doing Brunell-Bond panel data analysis and the results seem completely counter-intuitive. The DV is a food prices index - and so if...

    Started by SylviaS‎, 04-09-2012 01:53 PM
    • Replies: 7
    • Views: 1,968
    04-09-2012, 03:23 PM Go to last post
  4. Question about missing values in panel data

    Hi All, I have several countries (out of all the list) for which 1 or 2 variables (out of 9-10) are missing for all 6 years considered. Is there...

    Started by SylviaS‎, 04-08-2012 07:41 AM
    • Replies: 0
    • Views: 1,811
    04-08-2012, 07:41 AM Go to last post
  5. Comparing responses on 5-point scale

    Hi All, I have administered a 5-point scale on my participants which they answered on 10 value items- can I assume this is interval data? I have...

    Started by JB89‎, 04-04-2012 01:32 PM
    • Replies: 3
    • Views: 2,437
    04-05-2012, 03:26 AM Go to last post
  6. T-test or not to t-test

    Hello I am conducting research and i am using a likert based survey. I need to know besides means, standard deviations and frequencies what...

    Started by yankeeoneniner‎, 03-26-2012 05:49 PM
    • Replies: 5
    • Views: 2,171
    04-04-2012, 09:16 PM Go to last post
  7. what type of statsitical test and survey to use

    hi I need help with my dissertation proposal. I have attached my research questions and a potential survey i could use. I dont know what statsical...

    Started by yankeeoneniner‎, 04-04-2012 07:29 PM
    • Replies: 1
    • Views: 1,384
    04-04-2012, 07:57 PM Go to last post
  8. Hypothesis testing with Maximum A Posteriori (MAP) estimators

    Hi, Does anyone know of any work on hypothesis testing with MAP estimators? The likelihood ratio test is based on asymptotic distributions, so I...

    Started by cfp‎, 04-04-2012 05:46 PM
    • Replies: 0
    • Views: 1,727
    04-04-2012, 05:46 PM Go to last post
  9. Simultaneous M-estimator of location and scale

    Hi I am having trouble with the simultaneous estimation of the M-estimator for location and scale. I am trying to implement a iterative weighted...

    Started by MrOperator‎, 04-03-2012 12:53 PM
    • Replies: 0
    • Views: 1,746
    04-03-2012, 12:53 PM Go to last post
  10. 10 point scale and central limit theorem

    I want to do a comparative analysis between two means of groups. I want to hear opinions on two things. 1. I asked participants to rate me...

    Started by micdhack‎, 03-31-2012 08:43 AM
    • Replies: 6
    • Views: 2,718
    04-03-2012, 05:20 AM Go to last post
  11. Normal distribution...

    Hi. In many examples I have seen that service time for passengers (time between 2 bus arrivals) is modeled by using normal distribution. As usually...

    Started by endri81‎, 04-03-2012 04:32 AM
    • Replies: 0
    • Views: 1,646
    04-03-2012, 04:32 AM Go to last post
  12. Outliers (Multiple outlier detection - PROC ROBUSTREG)

    Can anybody describe to me (as simply as possible) what M-estimation and LTS estimation are? I'm trying to learn more about outlier detection...

    Started by lancearmstrong1313‎, 04-02-2012 12:49 PM
    • Replies: 0
    • Views: 2,536
    04-02-2012, 12:49 PM Go to last post
  13. Export and Import Model

    Hi I am doing a project examining bilateral trade between Canada and U.S. This model was the most recent in the literature and was advised by my...

    Started by solomon‎, 07-07-2011 01:16 PM
    • Replies: 2
    • Views: 2,061
    04-01-2012, 09:27 AM Go to last post
  14. Bayesian point hypothesis testing for contigency table

    Hi everyone, I've been using bayesian hypothesis testing to compare a 2x2 table using the example that can be found on this book:...

    Started by micdhack‎, 03-29-2012 10:09 AM
    • Replies: 1
    • Views: 1,475
    03-31-2012, 08:34 AM Go to last post
  15. 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: 3,672
    03-30-2012, 09:56 AM Go to last post
  16. Question Using variations of ANCOVA for non-normal distributions

    My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is...

    Started by carlosandrade‎, 03-29-2012 05:15 PM
    ancova, anova, linear-regression
    • Replies: 0
    • Views: 969
    03-29-2012, 05:15 PM Go to last post
  17. Question Using variations of ANCOVA for non-normal distributions

    My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is...

    Started by carlosandrade‎, 03-29-2012 04:28 PM
    ancova, anova, linear regression, non-parametric, parametric
    • Replies: 0
    • Views: 1,696
    03-29-2012, 04:28 PM Go to last post
  18. Is Count/Expected Count in Chi Square a good descriptive measure?

    I want to simplify these outcomes. Can I simply divide the observed count / expected count to get a sort of 'odds ratio'? I am doing this with +3...

    Started by skoren‎, 03-28-2012 09:28 PM
    • Replies: 2
    • Views: 1,476
    03-29-2012, 01:27 PM Go to last post
  19. im i doing this right?

    Help PLEASE!!!! I'm attempting to do a stats assignment atm and I'm hoping to get some feedback on how im doing so far. the assignment is this: ...

    Started by tippiekatie‎, 03-28-2012 07:32 PM
    • Replies: 9
    • Views: 2,565
    03-29-2012, 01:17 PM Go to last post
  20. ANOVA with subject id's as variables?

    Hi everybody, I work in sleep research and it is usually of interest to us to compare variables between different sleep stages (wakefulness, N1,...

    Started by EnzoTaglia‎, 03-13-2012 05:10 PM
    • Replies: 6
    • Views: 2,559
    03-27-2012, 04:01 PM Go to last post
  21. calculating d'

    I am working on a project using a 3AFC test and am unsure about how to calculate d' in that scenario. Am I still just using Hits/False Alarms as if...

    Started by moonprizim‎, 03-27-2012 08:46 AM
    • Replies: 1
    • Views: 1,461
    03-27-2012, 01:16 PM Go to last post
  22. Ranked Data Newbie - please help!

    Hi, I recently ran several focus groups where particpants were asked to rank a series of 18 photos from most natural to most unnatural. I then gav...

    Started by Kate Walker‎, 03-27-2012 09:23 AM
    non-parametric, rank order data analysis, significant difference
    • Replies: 0
    • Views: 977
    03-27-2012, 09:23 AM Go to last post
  23. 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: 1,754
    03-26-2012, 09:57 PM Go to last post
  24. I need some help...

    Hi, I am a researcher studying language-editing services and I just finished conducting an analysis of language-editing models. Basically, I am...

    Started by regjon‎, 03-25-2012 09:26 AM
    • Replies: 1
    • Views: 1,321
    03-26-2012, 02:13 PM Go to last post
  25. Chance performance in a binary choice task

    Hello! I am analyzing data in which participants have answered 80 binary-choice questions; one option is correct and one option is incorrect. Is...

    Started by bimodal‎, 03-26-2012 10:58 AM
    • Replies: 1
    • Views: 2,285
    03-26-2012, 11:34 AM Go to last post
  26. Help deciding which analysis to run

    Hi all, I'm doing a study and having trouble deciding on the appropriate analysis. I'll give a simple example of what I'm trying to do and any help...

    Started by conrad2012‎, 03-23-2012 02:50 PM
    • Replies: 0
    • Views: 959
    03-23-2012, 02:50 PM Go to last post
  27. Data collection???

    First off apologies if I should have just posted this in my other thread. I am working with some cycle hire data from the Barclays Bicycle Hire...

    Started by Wevans2303‎, 03-22-2012 07:04 PM
    • Replies: 2
    • Views: 1,488
    03-22-2012, 07:52 PM Go to last post
  28. Is MANOVA the most appropriate test?

    I'm interested in how microphone types affect the result of acoustic analysis measures. I'm looking for the most appropriate statistical test to...

    Started by Linguist_‎, 03-20-2012 11:40 PM
    • Replies: 2
    • Views: 2,006
    03-22-2012, 12:49 PM Go to last post
  29. Multiple likert scales- Rankig eac

    Removed as posted in wrong area.

    Started by jb88‎, 03-22-2012 11:52 AM
    • Replies: 0
    • Views: 1,857
    03-22-2012, 11:52 AM Go to last post
  30. Unbalanced sample size

    Hello I have a question... what can an unbalanced sample cause ? For example, I have 2 groups, and I want to either use a t-test, or some...

    Started by NN_STAT‎, 03-22-2012 10:18 AM
    • Replies: 1
    • Views: 2,732
    03-22-2012, 11:12 AM Go to last post
  31. Missing Data

    I used an original survey form to collect data and afterwards realized that the final copy of that survey included a question that was not on the...

    Started by ctphd2b‎, 03-20-2012 08:02 PM
    • Replies: 6
    • Views: 2,034
    03-21-2012, 09:22 PM Go to last post
  32. 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: 7,414
    03-21-2012, 06:20 PM Go to last post
  33. 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: 2,900
    03-21-2012, 02:30 PM Go to last post
  34. Question Variance of combined clusters

    During the process of cluster analysis, when two clusters with estimated variance {s}_{1}^{2} and {s}_{2}^{2} what is the estimated variance of the...

    Started by readytolearn‎, 03-20-2012 12:44 AM
    • Replies: 0
    • Views: 940
    03-20-2012, 12:44 AM Go to last post
  35. Question When homogeniety of regression slopes (for ANCOVA) is significant.

    HI, I have conducted an ANCOVA and have a significant interaction when testing the homogeniety of regression slopes assumption. My IV is Group...

    Started by DancingSpirit‎, 03-19-2012 11:45 PM
    • Replies: 0
    • Views: 1,336
    03-19-2012, 11:45 PM Go to last post
  36. Variance sum law proof

    Hey guys, I was wondering if something could get me started on a proof for the variance sum law. For the sake of clarification, I'm referring...

    Started by Rhodo‎, 03-17-2012 05:50 PM
    • Replies: 10
    • Views: 11,294
    03-17-2012, 10:10 PM Go to last post
  37. simple experiment - did I pick the right test?

    Hello, I hava a quick question: I formulated the H0 and H1 (the manipulated variable affected the results), picked the "between participants...

    Started by mashimaro‎, 03-10-2012 07:57 PM
    • Replies: 1
    • Views: 1,205
    03-16-2012, 04:42 PM Go to last post
  38. MANOVA interpretation

    Hello Everyone, I have a couple questions regarding the interpretation & reporting of a recent MANOVA that I ran. A little background on this...

    Started by mwill101‎, 03-16-2012 04:13 PM
    • Replies: 0
    • Views: 2,886
    03-16-2012, 04:13 PM Go to last post
  39. Random effects estimator

    Hi, I don't quite understand what a random effects estimator actually does... I have individual data for 2 (not adjacent) years: Some...

    Started by Sappsallap‎, 03-14-2012 03:28 AM
    panel estimators, random effects
    • Replies: 0
    • Views: 1,399
    03-14-2012, 03:28 AM Go to last post
  40. Curve parameters

    Hi all, I have a curve with an intercept, slope, and quadratic factor. Now, I would like a draw a curve that is one standard deviation above this...

    Started by nrstein1‎, 02-02-2012 03:15 PM
    • Replies: 8
    • Views: 2,777
    03-13-2012, 03:10 PM Go to last post
  41. Mass significance – information criterion

    In search for the ’best’ linear regression model with 10 potential predictors I calculated the Schwarz Bayesian Criterion (SBC) for every possible...

    Started by Bassler‎, 03-13-2012 04:25 AM
    false positives, information criterion, mass significance, regression analysis
    • Replies: 0
    • Views: 50,219
    03-13-2012, 04:25 AM Go to last post
  42. Algebra of random variables?

    Hi Guys, I'm in the field now, so I'm not online much. However I do have a burning question. Does anyone have any book suggestions for me that...

    Started by TheEcologist‎, 03-12-2012 09:51 AM
    • Replies: 2
    • Views: 2,483
    03-12-2012, 11:33 AM Go to last post
  43. Need help on the suitable design selection

    hi guys... i have been given a set of data with 5 input factors and 1 output. among the inputs, 3 are in numerical form and another 2 are in...

    Started by holeow‎, 03-11-2012 10:48 AM
    • Replies: 0
    • Views: 2,432
    03-11-2012, 10:48 AM Go to last post
  44. Panel Data - Pooled OLS vs Fixed Effects vs Random Effects

    Hi forummers, I am a finance PhD student and am currently undertaking some statistical analysis of bankruptcy risk. I have data on roughly 500...

    Started by g1362901‎, 03-26-2009 11:35 AM
    • Replies: 2
    • Views: 78,979
    03-09-2012, 01:54 PM Go to last post
  45. Event Study Methodology - Event Window

    Hi, I am currently beginning an event study on the effect of the Fukushima crisis on U.S. electrical utility companies. I am completely new to...

    Started by juxtaposition‎, 03-09-2012 07:52 AM
    • Replies: 0
    • Views: 2,783
    03-09-2012, 07:52 AM Go to last post
  46. Issue with data analysis

    This has given me sleepless nights. Let's say I have a study where I want to look at the relationship between Grade Point Average and basket...

    Started by dummyvariables‎, 03-08-2012 04:18 PM
    • Replies: 2
    • Views: 2,286
    03-08-2012, 07:05 PM Go to last post
  47. Likert Scale

    Hi! Can you help me with my stat research problem? what is the difference between 3-point likert and 5-point likert scale? which is better to use and...

    Started by mae‎, 03-02-2012 05:03 AM
    • Replies: 6
    • Views: 17,345
    03-08-2012, 05:37 AM Go to last post
  48. Sampling problems

    Hi, I need to sample randomly my dataset for 1000 times. The sample need to be the 80%. I know how to do that, my problem is that not only I need...

    Started by Oritteropus‎, 03-07-2012 11:43 AM
    • Replies: 2
    • Views: 1,999
    03-07-2012, 07:05 PM Go to last post
  49. Independence between errors assumption

    Hi all, thank you How do i check independence between errors graphically? Did i have to make a Residual vs factor plot? Thanks Thanks

    Started by sureño‎, 03-07-2012 06:23 PM
    • Replies: 0
    • Views: 1,457
    03-07-2012, 06:23 PM Go to last post
  50. Sampling frequency

    Hello all, I am a doctor in intensive care. Part of my work includes undertaking clinical research. I have a question for statisticians /...

    Started by tonytheviking‎, 03-07-2012 09:25 AM
    • Replies: 1
    • Views: 1,395
    03-07-2012, 04:57 PM Go to last post
  51. Methodology For Sports Statistics Projections

    Good day! I am new to statistics and I want to try my hand at creating sports statistics projections. I'm posting in this thread because my first...

    Started by mightyeskimo‎, 03-05-2012 02:22 PM
    • Replies: 7
    • Views: 3,768
    03-07-2012, 01:08 PM Go to last post
  52. Red face Convergent and Divergent Validity

    Is it possible to make a multimethod-multitrait matrix of tests with different number of items? example: Test 1 consists of 5 categories with 24...

    Started by mae‎, 03-05-2012 10:07 AM
    • Replies: 7
    • Views: 3,612
    03-06-2012, 10:30 AM Go to last post
  53. Cool Post hoc test for the multisample median test

    Hi all, I have a question about an investigation that i have developed. Specifically, i was comparing abundance of flyes among different...

    Started by sureño‎, 03-05-2012 08:27 PM
    • Replies: 0
    • Views: 3,273
    03-05-2012, 08:27 PM Go to last post
  54. a data modeling question

    Just had a job interview with a bank. They asked me the following questions: 1. Their credit card offers reward points. They want to predict...

    Started by aha123‎, 03-05-2012 02:26 AM
    • Replies: 1
    • Views: 1,685
    03-05-2012, 04:26 AM Go to last post
  55. Correlation coefficient in two groups separately and the collapsed across groups

    Hi, I'm having trouble interpreting the results of a test of bivariate correlation. I am computing Pearson's r in a group of 400 as a whole,...

    Started by slipperyn‎, 03-03-2012 11:38 AM
    • Replies: 2
    • Views: 2,133
    03-03-2012, 12:26 PM Go to last post
  56. Question Multiple Imputation of Pre-Composite Scores

    I'm running the analysis on a study that used questionnaires. Several items on the questionnaires can be added to come up with composite scores of a...

    Started by Fulanito de Tal‎, 02-21-2012 10:53 AM
    • Replies: 4
    • Views: 3,266
    03-02-2012, 06:33 PM Go to last post
  57. How can I analyse this data?

    Hi guys, I'm currently doing research for my dissertation. Background info: Generally speaking, I am studying perceptions of different factors...

    Started by thetonto‎, 02-24-2012 02:39 PM
    • Replies: 1
    • Views: 1,287
    03-02-2012, 04:44 PM Go to last post
  58. Correlation

    Hi! I'm currently working on a research..but I'm having problems with correlation. I want to correlate a test with 5 general scales to a test with...

    Started by mae‎, 03-02-2012 05:08 AM
    • Replies: 2
    • Views: 2,140
    03-02-2012, 11:52 AM Go to last post
  59. Using a likelihood to fit a model

    Dear all, I am doing some research into mixture modelling. I have determined (albeit crudely) that a three component mixture model is my best...

    Started by ljbcmshe‎, 02-29-2012 11:57 AM
    • Replies: 0
    • Views: 1,477
    02-29-2012, 11:57 AM Go to last post
  60. 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: 3,874
    02-29-2012, 08:50 AM Go to last post

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