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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: 18,639
    10-11-2014, 12:02 PM Go to last post
  1. How to model time intervals

    I have a dataset that I am trying to analyze that contains price information for a market index. I suspect that the behavior of the price for this...

    Started by hodag‎, 02-20-2012 10:07 AM
    • Replies: 0
    • Views: 1,457
    02-20-2012, 10:07 AM Go to last post
  2. Im struggling -What post-hoc analysis tests?

    Hi Guys I’m new here and really hope you can help me out! I’m having a struggle with some research data and have done the first part of some...

    Started by lilly‎, 02-16-2012 04:22 PM
    • Replies: 6
    • Views: 5,101
    02-20-2012, 12:30 PM Go to last post
  3. Categorical data goodness of fit question

    Hello, I am trying to fit a log linear model with proc genmod and when i include all interactions (3 variables) i get the following: Criterion...

    Started by szm‎, 02-21-2012 04:12 PM
    categorical data analysis, chi square, deviance, genmod, log linear
    • Replies: 6
    • Views: 3,515
    02-21-2012, 06:20 PM Go to last post
  4. Partial Correlation with several control variables

    Dear board, I'm currently conducting a study and due to my hypothesis, there are several variables that may have an influence on one DV. Since my...

    Started by MrChris86‎, 02-21-2012 07:30 PM
    • Replies: 0
    • Views: 1,730
    02-21-2012, 07:30 PM Go to last post
  5. LISREL Problem with SEM's

    Could someone please help me whether it is possible to calculate a path diagram in LISREL that is designed as follows: Independent variables:...

    Started by Natalie_k‎, 02-23-2012 06:20 AM
    • Replies: 0
    • Views: 2,771
    02-23-2012, 06:20 AM Go to last post
  6. TOST- two one sided t-test

    Does anyone know how to compute these by hand or in minitab? Its an equivalence test, Thanks

    Started by JB89‎, 02-24-2012 10:51 AM
    • Replies: 0
    • Views: 4,361
    02-24-2012, 10:51 AM Go to last post
  7. Reporting non-statistically significant t-test

    If we assess that with alpha=.05 and beta=.8 we can evaluate the statistical power to detect effect sizes based on the sample. 783 participants are...

    Started by micdhack‎, 02-24-2012 07:14 AM
    • Replies: 10
    • Views: 11,667
    02-24-2012, 03:33 PM Go to last post
  8. Chi square contingency table error!

    From what I understand of chi square the rows and columns must be data that are categorical. My first question is whether Increase and decrease...

    Started by kenshi64‎, 02-26-2012 07:50 AM
    • Replies: 2
    • Views: 1,650
    02-26-2012, 08:52 AM Go to last post
  9. Comparing pretest and posttest measures of intervention group with control

    Hi, Having a pretest and posttest measure for both and intervention group and a control group, I am not sure how to compare these. The groups are...

    Started by Jannez‎, 02-14-2012 05:27 AM
    • Replies: 3
    • Views: 4,352
    02-27-2012, 12:05 PM Go to last post
  10. Determining Significance Based on Prelimiary Data

    I have conducted a test where I measured the same subjects (n =9, 2 groups) over a period of 8 days. To determine significance between the two groups...

    Started by majixx11‎, 02-26-2012 04:38 PM
    • Replies: 5
    • Views: 1,885
    02-27-2012, 12:58 PM Go to last post
  11. Alpha reliability

    Theoretically, is it ok to carry out a t-test to see the difference between two Cronbach alpha reliability scores? Thanks

    Started by JB89‎, 02-28-2012 11:58 AM
    • Replies: 0
    • Views: 1,382
    02-28-2012, 11:58 AM Go to last post
  12. Lightbulb Data transformation and kruskal-wallis

    Hi! It's the first time I'm posting in your forum! I'm using statistics in a university project about operations research, and I'm having some...

    Started by Rak3l‎, 02-28-2012 11:46 AM
    kruskal-wallis
    • Replies: 2
    • Views: 2,213
    02-28-2012, 12:00 PM Go to last post
  13. 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
  14. Analysing an unbalanced factorial design

    Hello, I have data from an unbalanced factorial design, and would like some suggestions to analyse them. It is supposed to be 3 x 2 factorial...

    Started by madegwu‎, 02-28-2012 02:17 AM
    • Replies: 2
    • Views: 4,257
    02-28-2012, 11:43 PM Go to last post
  15. Comparing three groups that have been analysed by Friedman's ANOVA

    Dear all, I have been struggling with the following problem and would be extremely grateful for some help. :confused: I have three groups of...

    Started by Tulip‎, 02-29-2012 04:04 AM
    friedman's anova, mixed-design, non-parametric
    • Replies: 0
    • Views: 2,854
    02-29-2012, 04:04 AM Go to last post
  16. 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: 3,837
    02-29-2012, 08:50 AM Go to last post
  17. 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: 1,456
    02-29-2012, 11:57 AM Go to last post
  18. 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: 2,106
    03-02-2012, 11:52 AM Go to last post
  19. 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: 1,269
    03-02-2012, 04:44 PM Go to last post
  20. 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: 3,202
    03-02-2012, 06:33 PM Go to last post
  21. 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
    correlation
    • Replies: 2
    • Views: 2,115
    03-03-2012, 12:26 PM Go to last post
  22. 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: 1,665
    03-05-2012, 04:26 AM Go to last post
  23. 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: 3,224
    03-05-2012, 08:27 PM Go to last post
  24. 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: 3,591
    03-06-2012, 10:30 AM Go to last post
  25. 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: 3,726
    03-07-2012, 01:08 PM Go to last post
  26. 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: 1,380
    03-07-2012, 04:57 PM Go to last post
  27. 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: 1,447
    03-07-2012, 06:23 PM Go to last post
  28. 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: 1,975
    03-07-2012, 07:05 PM Go to last post
  29. 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: 17,250
    03-08-2012, 05:37 AM Go to last post
  30. 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: 2,243
    03-08-2012, 07:05 PM Go to last post
  31. 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: 2,744
    03-09-2012, 07:52 AM Go to last post
  32. 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: 78,642
    03-09-2012, 01:54 PM Go to last post
  33. 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: 2,388
    03-11-2012, 10:48 AM Go to last post
  34. 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: 2,450
    03-12-2012, 11:33 AM Go to last post
  35. 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: 50,175
    03-13-2012, 04:25 AM Go to last post
  36. 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: 2,742
    03-13-2012, 03:10 PM Go to last post
  37. 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: 1,372
    03-14-2012, 03:28 AM 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: 2,863
    03-16-2012, 04:13 PM Go to last post
  39. 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: 1,174
    03-16-2012, 04:42 PM Go to last post
  40. 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: 11,199
    03-17-2012, 10:10 PM Go to last post
  41. 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: 1,308
    03-19-2012, 11:45 PM Go to last post
  42. 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: 914
    03-20-2012, 12:44 AM Go to last post
  43. 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: 2,849
    03-21-2012, 02:30 PM Go to last post
  44. 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: 7,341
    03-21-2012, 06:20 PM Go to last post
  45. 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: 1,991
    03-21-2012, 09:22 PM Go to last post
  46. 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: 2,718
    03-22-2012, 11:12 AM Go to last post
  47. Multiple likert scales- Rankig eac

    Removed as posted in wrong area.

    Started by jb88‎, 03-22-2012 11:52 AM
    • Replies: 0
    • Views: 1,836
    03-22-2012, 11:52 AM Go to last post
  48. 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: 1,977
    03-22-2012, 12:49 PM Go to last post
  49. 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: 1,470
    03-22-2012, 07:52 PM Go to last post
  50. 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: 953
    03-23-2012, 02:50 PM Go to last post
  51. 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: 2,276
    03-26-2012, 11:34 AM Go to last post
  52. 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: 1,304
    03-26-2012, 02:13 PM Go to last post
  53. 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: 1,744
    03-26-2012, 09:57 PM Go to last post
  54. 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: 970
    03-27-2012, 09:23 AM Go to last post
  55. 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: 1,449
    03-27-2012, 01:16 PM Go to last post
  56. 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: 2,542
    03-27-2012, 04:01 PM Go to last post
  57. 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: 2,541
    03-29-2012, 01:17 PM Go to last post
  58. 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: 1,464
    03-29-2012, 01:27 PM Go to last post
  59. 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: 1,668
    03-29-2012, 04:28 PM Go to last post
  60. 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: 940
    03-29-2012, 05:15 PM Go to last post

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