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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: 18,723
    10-11-2014, 12:02 PM Go to last post
  1. Assumptions for an ARIMA(p, d, q) model (Box-Jenkins)

    I have a data set which is stationary but the histogram looks like a logaritmic distribution. Is this a problem? Is normality an assumption to use...

    Started by Fred_a‎, 02-18-2013 12:01 PM
    arima
    • Replies: 1
    • Views: 6,136
    02-18-2013, 12:52 PM Go to last post
  2. Was thinking Kendall's Tau but...(correlation)

    Hey guys, I was wondering if you could help me out with this: I have seven sites along the west coast each with two types of data and several...

    Started by aesopclimber‎, 07-20-2011 11:39 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,119
    08-15-2011, 08:06 PM Go to last post
  3. Census & tests for significance?

    I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

    Started by pbakker‎, 11-12-2010 09:35 AM
    • Replies: 6
    • Views: 6,107
    11-12-2010, 02:09 PM Go to last post
  4. Reduce number of predictor variables ((multi)collinearity): PCA not helpful

    Howdy, The attached spreadsheet contains the correlation matrix of predictor variables and response variable. Correlation exists between them. ...

    Started by nofunsally‎, 06-23-2011 04:31 PM
    • Replies: 11
    • Views: 6,107
    07-13-2011, 10:15 AM Go to last post
  5. Smile Appropriate method for research model

    Hi guys! Please i need your advice! I have developed a model about some factors that influence the desire of members to share information is...

    Started by icsd04‎, 07-22-2011 09:33 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,105
    07-26-2011, 10:11 PM Go to last post
  6. What to do if sample size is too big? (ttest)

    So I'm running ttests for a descriptive statistic table and all my results are significant, but I"m concerned that the sample size is too big 3,880...

    Started by vikingo‎, 01-23-2014 11:23 AM
    large sample size, power, pplot, sample size, ttest
    • Replies: 5
    • Views: 6,105
    02-01-2014, 05:47 PM Go to last post
  7. Monte Carlo simulation: how many runs?

    Hi, Most papers I read related to Monte Carlo (MC) simulation method say that there is no rule on the minimum number of runs required. However, in...

    Started by AlinaN‎, 04-05-2015 11:11 PM
    monte carlo
    • Replies: 12
    • Views: 6,102
    04-07-2015, 06:21 AM Go to last post
  8. How to calculate variance on pooled data

    I have an array of pairs. Each pair represents a "bin" in a range. Each pair stores a sum and a count. Data is added to a pair/bin by adding the...

    Started by felixcollins‎, 05-17-2010 11:37 PM
    • Replies: 2
    • Views: 6,078
    05-30-2010, 09:49 PM Go to last post
  9. Factorial ANOVA

    I am reading a paper looking at the effect of interventions (an aerobic exercise regime group, a stretching exercise regime group, plus a contol...

    Started by static‎, 10-10-2011 10:46 PM
    • Replies: 3
    • Views: 6,061
    10-12-2011, 02:49 AM Go to last post
  10. Test statistic concerning mean comparison of UNKOWN sample distributions?

    Hello, all. I'm far from a statistics expert, so excuse me for any inaccuracy that I might say. I'm trying to compare two sample distributions...

    Started by moudatsos‎, 09-29-2008 08:31 AM
    • Replies: 3
    • Views: 6,047
    10-14-2011, 09:03 AM Go to last post
  11. Is Post hoc necessary in a Mixed ANOVA 2x2

    Hi, I have 2 groups evaluated at time 1 and 2. I used Mixed ANOVA 2x2 but now I'm not sure if I have to do post hoc test. I have read some papers...

    Started by pcastro‎, 01-09-2011 12:59 PM
    • Replies: 1
    • Views: 6,047
    01-10-2011, 02:55 AM Go to last post
  12. Question results SIMPER dissimilarity for species with equal mean abundance

    Dear all, I am doing my master thesis on subtidal algae species in the north Atlantic. Herefore I have presence-absence data of different algae...

    Started by sofia‎, 05-04-2012 08:45 AM
    • Replies: 1
    • Views: 6,038
    05-04-2012, 09:08 PM Go to last post
  13. how to find the UMVUE of the location parameter under t distribution

    f(x;\theta)={{\Gamma({{v+1}\over2})}\over{\Gamma({v\over2})\sqrt{\pi v}}}\Big(1+\frac{(x-\theta)^2}{v}\Big)^{-\frac{v+1}{2}} , v>=3 i have no...

    Started by egpivo‎, 04-03-2010 01:10 AM
    • Replies: 7
    • Views: 5,977
    04-04-2010, 09:05 AM Go to last post
  14. From OLS to Box Cox to ?

    Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

    Started by andony‎, 08-29-2008 01:25 PM
    • Replies: 4
    • Views: 5,970
    08-31-2008, 02:58 PM Go to last post
  15. Conjoint analysis

    ....i need some insight please... those familiar with conjoint, though i don't have any statistical package to run on it, so my plan was to do...

    Started by edhunter‎, 08-11-2008 12:00 PM
    • Replies: 4
    • Views: 5,924
    03-16-2009, 05:52 AM Go to last post
  16. 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: 5,917
    02-17-2011, 07:54 AM Go to last post
  17. Raw Data vs Frequency Distribution

    Hi, I am new here, please discuss this given below. “Why an average computed from a frequency distribution is not exactly the same as...

    Started by Anum‎, 05-09-2015 07:44 AM
    • Replies: 6
    • Views: 5,908
    05-11-2015, 07:48 AM Go to last post
  18. Question pre-test post-test difficulty

    Hi everyone, I'm new to the forum, but I'm definitely glad it's here. I have a difficult research design problem / stats problem that I was...

    Started by rclukey‎, 09-09-2008 05:09 PM
    • Replies: 1
    • Views: 5,903
    09-09-2008, 10:02 PM Go to last post
  19. Conjoint analysis - orthogonal design

    Hi I'm setting up a conjoint experiment. It will be a traditional full profile setup with 7 factors (5 factors have 2 levels, 2 factors have 3...

    Started by Frederik‎, 12-03-2010 09:46 AM
    • Replies: 0
    • Views: 5,875
    12-03-2010, 09:46 AM Go to last post
  20. t-tests after three-way ANOVA?

    Hi all, I've just run a three-way ANOVA on my data (3 IVs, 1 DV). I've got some main effects, as well as a three-way interaction effect. Am I...

    Started by psychi‎, 03-01-2011 05:29 AM
    anova, t-test, three-way anova
    • Replies: 3
    • Views: 5,875
    03-04-2011, 05:20 PM Go to last post
  21. Manova outlier cutoff

    I have been reading that Manova is very sensitive to outliers, particularly for small groups. One text I read suggests using 3.5 SD as a cutoff for...

    Started by Prairies‎, 12-01-2008 04:17 PM
    • Replies: 5
    • Views: 5,851
    12-04-2008, 12:22 PM Go to last post
  22. which statistical test to use in spss

    I have a variable (dependent) and five independent variables. How can I test if the five variables affect the dependent variable? Which test should...

    Started by hahahihihuhu‎, 03-02-2011 12:38 PM
    • Replies: 1
    • Views: 5,836
    03-03-2011, 08:56 PM Go to last post
  23. Project ideas for Statistical quality control

    I was hoping I could get some beneficial input as to what problem I should address for my statistical quality control project. As of now we have...

    Started by bigbob‎, 03-01-2014 09:38 PM
    • Replies: 0
    • Views: 5,835
    03-01-2014, 09:38 PM Go to last post
  24. Calculating and interpreting Spearman's Rank Correlation...

    Hi. I am completing an undergraduate research project and am having a bit of trouble completing the statistical analysis. I'll briefly run through...

    Started by Hedgehog‎, 11-24-2010 01:33 AM
    • Replies: 1
    • Views: 5,825
    12-04-2010, 04:15 AM Go to last post
  25. Age-Matching Groups Who Differ on Age

    I have two groups of children, A and B. Group A is the treatment group and has an age range of 5-7 years old. Group B is the control group and has an...

    Started by Barnzilla‎, 10-31-2008 01:40 PM
    • Replies: 4
    • Views: 5,823
    11-06-2008, 02:17 PM Go to last post
  26. KS or Wilcoxon?

    I have some survey data which I want to analyse using non-parametric test. It is a single sample (approx. 100) It is ordinal - likert scale e.g....

    Started by Blom‎, 04-18-2011 04:43 PM
    • Replies: 4
    • Views: 5,823
    04-21-2011, 01:37 PM Go to last post
  27. Algebra, two-sample t-statistic, variance

    Could someone help to start with the question. Question: http://s12.postimage.org/kvtyiacuj/question.png Thanks!

    Started by _joey‎, 08-06-2012 02:24 AM
    2 Pages
    1 2
    • Replies: 20
    • Views: 5,805
    08-13-2012, 12:31 AM Go to last post
  28. ANOVA weighted means?

    Hi Chaps, I am trying to run a comparison between two groups - patients and staff - ratings of the quality of life on a ward. Simple enough,...

    Started by piblet‎, 06-05-2009 08:37 AM
    • Replies: 3
    • Views: 5,790
    06-05-2009, 12:15 PM Go to last post
  29. Summary variable for adversities

    Fellow members, I'm doing research currently on the effects of childhood adversities on development of the autonomic nervous system. I'm a little...

    Started by Link‎, 10-05-2010 11:55 PM
    • Replies: 8
    • Views: 5,790
    10-07-2010, 12:30 AM Go to last post
  30. Cut-off Points in Linear Discriminant Analysis

    Everyone can discuss about the cut-off points in linear discriminant analysis. I know how to calculate it when there are 2 groups. But, more than 2...

    Started by shike‎, 09-15-2008 11:55 PM
    • Replies: 2
    • Views: 5,774
    09-16-2008, 02:22 AM Go to last post
  31. Advice for analyzing a small sample

    I am currently working on my doctoral thesis in computer science and I have data from an experiment that I want to analyze, but I don't want to run...

    Started by Jefficus‎, 02-15-2010 02:51 PM
    • Replies: 5
    • Views: 5,742
    02-18-2010, 10:39 PM Go to last post
  32. Question on omega squared...please help!

    I have just obtained the output for a one way repeated measures ANOVA and have read that it is useful to report the size of the effect using omega...

    Started by nogoodatstats‎, 08-20-2009 03:28 PM
    • Replies: 0
    • Views: 5,736
    08-20-2009, 03:28 PM Go to last post
  33. Skewed data - what test should I use

    Research question: Does wearing a helmet affect head repositioning error in a group of normal participants compared to not wearing a helmet? 3...

    Started by KDS‎, 08-03-2013 05:50 AM
    median test, skewed data
    • Replies: 3
    • Views: 5,732
    08-04-2013, 07:08 PM Go to last post
  34. Thumbs up Significance in a Yes/No question

    Hi, So I'm working on a research project that is looking into whether there's a statistically significant difference between pilots in their...

    Started by airwee‎, 04-30-2011 03:45 PM
    • Replies: 2
    • Views: 5,726
    06-22-2011, 02:01 PM Go to last post
  35. rxc contingency table: comparison between cells?

    Hello.I'm a dental student. I'm studying about how restorative methods are going to affect fracture pattern(fra.(fp)) of teeth. As a result I have a...

    Started by batosan‎, 06-24-2010 06:58 AM
    • Replies: 7
    • Views: 5,724
    06-26-2010, 04:52 AM Go to last post
  36. Coding Data

    I am examining the relationship between employee level of education and the severity of their disciplinary offenses. I coded education...

    Started by eagle12‎, 08-24-2011 09:59 PM
    2 Pages
    1 2
    coding, correlation, data, research design
    • Replies: 21
    • Views: 5,719
    08-26-2011, 09:30 AM Go to last post
  37. ranking and meta-analysis

    Hi everybody, I have a problem regarding some statistical evaluations. I want to conduct a meta-analysis of several papers. The goal of the...

    Started by Leosw1981‎, 11-10-2010 11:39 AM
    • Replies: 2
    • Views: 5,710
    11-11-2010, 03:02 AM Go to last post
  38. Application of Significance Testing

    SAMPLE SIZE: 518 in each city QUESTION: Likeness to have Coke after dinner. Positive Response to the Question: 320 in each city ...

    Started by bsaikrishna‎, 12-06-2010 02:47 AM
    • Replies: 6
    • Views: 5,698
    12-08-2010, 12:54 AM Go to last post
  39. Are there any post hoc analyses for Chi Square data?

    Hi, I've got some Chi square results that I would like to analyze post hoc. Any ideas? I've got categorical data. Kind regards Brionny

    Started by Brionny‎, 03-08-2009 06:03 PM
    • Replies: 2
    • Views: 5,689
    03-10-2009, 04:57 PM Go to last post
  40. Question about ANOVA alternatives for non-normally distributed data

    I am trying to analyze data from an experiment where participants take two reading tests, to compare the effectiveness of two different dictionaries...

    Started by KanjiTester‎, 11-08-2010 08:58 AM
    • Replies: 0
    • Views: 5,688
    11-08-2010, 08:58 AM Go to last post
  41. Individual level moderator in HLM? Need help, please!

    Hi, I'm working on a paper about the influence of a group-level variable on a individual-level variable and want to add an individual-level...

    Started by stef‎, 05-25-2011 07:15 AM
    • Replies: 2
    • Views: 5,683
    06-29-2011, 07:23 AM Go to last post
  42. bias of the coefficient of variation

    Is the coefficient of variation biased? How would you compute the bias of CV? Can I write E(sigma_hat/|mu_hat|) = E(sigma_hat)E(1/|mu_hat|)+ ...

    Started by zzzc‎, 03-30-2011 10:50 AM
    • Replies: 4
    • Views: 5,678
    03-30-2011, 02:38 PM Go to last post
  43. how to using mann kendall test?

    hi everyone, i am a new member of this forum and i'm not statistician. my english is not good, sorry for language. i'm having trouble with the...

    Started by silvi_math55@yahoo.co.id‎, 05-18-2013 07:37 AM
    • Replies: 2
    • Views: 5,678
    05-20-2013, 06:14 AM Go to last post
  44. Paired t test or repeated anova

    I have a two groups design (treatment vs control) and pre and post test. I've looked at a paired t-test to see if there was a difference, and...

    Started by proprioceptivo‎, 08-02-2011 07:54 PM
    psychology
    • Replies: 2
    • Views: 5,673
    08-02-2011, 08:09 PM Go to last post
  45. Random Variables and Correlation

    I claim that if x is a normal distributed random variable, and y is a uniformly distributed random variable then x and y cannot have a correlation of...

    Started by rsherry8‎, 11-17-2008 10:14 PM
    • Replies: 11
    • Views: 5,669
    11-20-2008, 03:47 PM Go to last post
  46. Representing a distance measure with math equation

    I'm working on presenting a distance measure at a conference but don't have a publication quality math formula for representing what I'm doing in R. ...

    Started by trinker‎, 11-10-2013 09:56 PM
    2 Pages
    1 2
    • Replies: 26
    • Views: 5,653
    11-11-2013, 04:54 PM Go to last post
  47. Red face Analyzing factor scores from principal components analysis

    Hoping someone can help - I performed a PCA (using SPSS 18 Gradpack) on 10 variables (all measured on a scale of 0-10). Cases are individual...

    Started by careerstudent‎, 04-14-2010 06:34 PM
    • Replies: 6
    • Views: 5,634
    04-17-2010, 02:45 PM Go to last post
  48. Correlation or Difference?

    hello everybody, i have a question about which method would be more appropriate. I have a 4 point ordinal dependent variable. I also have 3...

    Started by micdhack‎, 02-26-2011 08:03 AM
    • Replies: 2
    • Views: 5,618
    02-26-2011, 11:41 AM Go to last post
  49. Distribution of p values

    Hello, I need some help understanding the last stage of a proof. I am trying to understand the proof that say that the distribution of the P...

    Started by NN_STAT‎, 07-30-2012 07:46 AM
    • Replies: 4
    • Views: 5,612
    08-01-2012, 09:11 AM Go to last post
  50. difference between mean ranks

    Hello! I asked respondents to rank 13 motivation factors in order of importance (from the most important to the least important). Now, I would...

    Started by m777k‎, 08-06-2010 07:34 AM
    • Replies: 1
    • Views: 5,608
    08-06-2010, 08:25 AM Go to last post
  51. Question Cross-estimating the independent variables to exclude outliers

    I am working on a dataset where some of the independent observations have measurement issues (i.e. mixed feet and metric). I'm considering...

    Started by erikstatman‎, 03-08-2014 08:49 AM
    modeling, outlier, regresion
    • Replies: 0
    • Views: 5,608
    03-08-2014, 08:49 AM Go to last post
  52. how to measure love/hate

    Any idea about how can one develop a scale (Likert) to measure concepts like love, liking, hate etc towards some prominent leaders from certain...

    Started by Dr.Appalayya‎, 01-22-2010 01:02 AM
    • Replies: 4
    • Views: 5,606
    04-13-2010, 01:27 PM Go to last post
  53. Simple Random Sampling - Variance Of An Estimator

    I am having problems with the following problem (from Cochran's "Sampling Techniques", 3rd edition, p.49, question 2.19): Suppose in a population...

    Started by TheFirstOrder‎, 05-15-2011 02:23 AM
    variance estimator
    • Replies: 5
    • Views: 5,606
    05-16-2011, 09:56 AM Go to last post
  54. eviews question

    Hello everybody, I need fto find evieuws somewhere on the web but i can't find it. Doesn anyone know where i can download for no charge? Thx for...

    Started by freddysurgery‎, 12-28-2010 01:20 PM
    • Replies: 3
    • Views: 5,593
    09-28-2011, 06:34 AM Go to last post
  55. paired T-test or anova

    Dear all just a quick simple one this time. if i had two sets of runners (in a race) for example and these two groups were linked only by the fact...

    Started by yoma819‎, 08-22-2010 05:51 PM
    • Replies: 7
    • Views: 5,591
    08-23-2010, 10:53 PM Go to last post
  56. How to model lagged correlation data?

    Suppose I have two time series data sets A and B. Calculating the correlation between the two I observe almose -80% correlation among A & B. My...

    Started by SVM‎, 03-08-2009 11:44 PM
    • Replies: 3
    • Views: 5,585
    03-19-2009, 12:07 AM Go to last post
  57. appropriate test for comparing rank order of countries

    I have a dataset where countries are ranked based on how often they are chosen by firms in different time periods i.e. 1966-80, 1981-95, 1996-2010. I...

    Started by tstats‎, 01-01-2011 08:22 PM
    • Replies: 2
    • Views: 5,576
    01-02-2011, 05:57 AM Go to last post
  58. Two-tail test

    For 1996, the U.S. Department of Agriculture has estimated that American consumers would have eaten, on average, 2.6 pounds of cottage cheese...

    Started by toby‎, 03-19-2006 01:24 PM
    • Replies: 1
    • Views: 5,564
    03-24-2006, 03:02 PM Go to last post
  59. Modelling the yield from sports bets - Potentially using a mixture of distributions?

    Hello all, A friend of mine asked me to analyze some data which comes from placing bets on sports. Having read quite a few threads and seeing how...

    Started by chaps‎, 03-25-2011 03:05 PM
    • Replies: 11
    • Views: 5,562
    04-01-2011, 03:35 PM Go to last post
  60. Excess Return - Benchmark Returns

    Well, I am new in the field of business research with very little stastics knowledge. Problem is that I have to calculate <excess return> which...

    Started by SFranck‎, 04-06-2011 07:15 PM
    • Replies: 3
    • Views: 5,561
    04-06-2011, 08:11 PM Go to last post

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