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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: 19,435
    10-11-2014, 12:02 PM Go to last post
  1. How to measure 1.5 σ after regression.

    I am new at Stats, i request for some hints/answer to better understand the concept of calculating the second equation. BACKGROUND: I have...

    Started by SFranck‎, 04-08-2011 08:17 AM
    • Replies: 0
    • Views: 217,567
    04-08-2011, 08:17 AM Go to last post
  2. 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: 97,217
    10-18-2012, 09:39 AM Go to last post
  3. Exclamation Suggest an Unbiased estimator for θ

    Prove that the maximum of the random sample of size 'n' from uniform distribution over is a biased but a consistent estimator of θ. Suggest a n...

    Started by amul28‎, 08-19-2010 12:59 AM
    • Replies: 3
    • Views: 93,671
    08-19-2010, 03:49 AM Go to last post
  4. 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: 80,552
    03-09-2012, 01:54 PM Go to last post
  5. One Sample T-Test with Likert Scale Questionnaire

    Hi all, I am doing a research and will study the how user think about shopping online. In my questionnaire, I have 3 questions - using Likert...

    Started by kenzq‎, 04-17-2009 03:08 AM
    • Replies: 8
    • Views: 68,328
    12-17-2016, 02:18 AM Go to last post
  6. Sum of the residuals

    Hi, My question may sound trivial but here it goes: When doing a sample regression by the ordinary least squares method, does the sum (nonsquared!...

    Started by val92‎, 02-04-2011 12:49 PM
    • Replies: 2
    • Views: 52,325
    02-04-2011, 01:40 PM Go to last post
  7. 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: 50,447
    03-13-2012, 04:25 AM Go to last post
  8. Three-way mixed ANOVA - Post-hoc-analysis (Scheffé-test?)

    Hello everybody, I hope someone is able to help me here, because I'm desperate and can't find help anywhere :-(. English is not my first...

    Started by Aila‎, 01-31-2012 01:11 PM
    mixed anova, post-hoc, scheffé
    • Replies: 0
    • Views: 49,841
    01-31-2012, 01:11 PM Go to last post
  9. Converting eta squared to Cohen's d

    I need to convert eta squared effect sizes to Cohen's d. It's for a meta-analysis paper, so I don't have the original data set. Is it possible...

    Started by lk145‎, 02-16-2011 12:34 AM
    • Replies: 5
    • Views: 46,800
    03-03-2011, 09:11 PM Go to last post
  10. Generating Skewed Normal Distributions

    I want to generate Random Normal Distributions with specific degrees of Skewness and Kurtosis. So far I have looked at the following two approaches:...

    Started by kanny_g‎, 02-04-2009 04:33 PM
    2 Pages
    1 2
    • Replies: 17
    • Views: 43,839
    06-03-2016, 10:10 PM Go to last post
  11. Question Correlations between groups of Likert-type answers – choice of statistical test

    I'm looking for the optimal way to interpret some data, so any constructive advice will be appreciated. A questionnaire with 3 groups of 50...

    Started by ajvar‎, 05-31-2012 03:41 PM
    correlation, likert, test
    • Replies: 1
    • Views: 41,576
    05-31-2012, 05:02 PM Go to last post
  12. help in Real survey data analysis‏

    would you please guide me to analyze it? i will tell u overall view of the questionnaire and goals and hope to help me how to analyze it the...

    Started by kormbo2002‎, 05-19-2012 02:36 PM
    • Replies: 2
    • Views: 41,164
    05-19-2012, 03:47 PM Go to last post
  13. Low cronbach's alpha - any remedy?

    Hi there, I want to construct a scale of 'contacting government' based on the question 'Please indicate if in the past year you contacted govt...

    Started by jesse‎, 07-22-2012 09:43 PM
    • Replies: 8
    • Views: 35,326
    07-27-2012, 08:52 AM Go to last post
  14. Question Sturges' Formula

    How can I prove Sturges' formula for determining number of classes in frequency distribution? k=Log2n+1 (n=number of data, k=number of classes)

    Started by masumeh‎, 09-27-2013 09:31 AM
    • Replies: 5
    • Views: 32,535
    09-27-2013, 12:01 PM Go to last post
  15. Pairwise comparisons

    If anyone has ANY idea at all i would be most appreciative My lab report includes pairwise comparisons, I have the SPSS output before me but I...

    Started by ne883‎, 06-03-2009 07:52 PM
    • Replies: 2
    • Views: 30,402
    06-15-2009, 08:05 PM Go to last post
  16. Choosing Kruskal–Wallis test for group comparison with unequal sizes

    I'm doing a survey that first seeks to identify the motivation types of university ESL students. My advisory committee added a comparison among...

    Started by btomatoe‎, 10-31-2012 01:14 AM
    • Replies: 2
    • Views: 28,248
    10-31-2012, 08:10 PM Go to last post
  17. Cramer's V effect size based on df

    I saw a presentation about chi-square testing and correlations. Specifically calculating effect size for Cramer's V results. The puzzling thing was...

    Started by micdhack‎, 10-11-2011 05:52 AM
    • Replies: 10
    • Views: 28,012
    10-15-2011, 12:41 PM Go to last post
  18. Slovin’s Formula in Excel (Calculating Survey Sample Size)

    Hello All, If anyone can help me with an formular that has had me somewhat stumped for the last few weeks now, I would be eternally grateful ! I...

    Started by Offshore‎, 07-21-2013 09:04 AM
    • Replies: 0
    • Views: 27,372
    07-21-2013, 09:04 AM Go to last post
  19. Non-parametric equivalent of a factorial anova (not repeated measures)?

    Hi there. Firstly apologies for the awful spelling in the main title - obviously I meant factorial Secondly hello I am new to this forum and...

    Started by chegginson‎, 12-03-2011 09:54 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 27,212
    12-03-2011, 03:52 PM Go to last post
  20. comparing means\unequal(small) size group

    Hi, I am about to use student t test to compare the mean of two independent groups. The first group sample size is 4 and another one is 24. Can I...

    Started by apahliani‎, 08-16-2009 03:51 PM
    • Replies: 4
    • Views: 27,013
    08-18-2009, 12:00 AM Go to last post
  21. level of significance 0.1%

    Hi! Would it be OK to use a level of significance of 0.1 -instead of traditional 0.05- when using non-parametric tests in bivariate analyses if...

    Started by juanpe000‎, 01-17-2011 08:10 AM
    • Replies: 9
    • Views: 26,296
    07-23-2013, 02:55 AM Go to last post
  22. Inclusion criteria of participants and internval validity

    Hi All, I am having trouble understanding how the inclusion criteria of participants can affect the internal validity of a study. This is my...

    Started by chiccaboom‎, 05-02-2012 02:11 AM
    • Replies: 1
    • Views: 26,290
    05-02-2012, 07:15 AM Go to last post
  23. Centering for interactions in multiple regression ??

    This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

    Started by danielkeeton‎, 11-11-2008 09:37 AM
    • Replies: 5
    • Views: 26,235
    12-01-2008, 06:50 PM Go to last post
  24. Bonferroni Correction Factor !!!

    Hello, What exactly Bonferroni correction factor means? Why we calculate it in our study? Thanks, Bala

    Started by Bala‎, 09-26-2008 02:44 AM
    • Replies: 9
    • Views: 26,211
    07-14-2009, 06:33 AM Go to last post
  25. Standard error (asymptotic standard error) of ŷi of exponential regression (Y = exp(a

    Hello People I was look a formual or description how to calculate standard error of ŷi or usually called asymptotic standard error in non-linear...

    Started by ggalex‎, 10-23-2008 10:49 AM
    • Replies: 0
    • Views: 25,788
    10-23-2008, 10:49 AM Go to last post
  26. Inter-observer variability

    Dear all, I hope so much anyone here may help me with my question regarding inter-observer variability: 3 observers measure the diameter of...

    Started by med1234‎, 06-29-2011 06:15 PM
    • Replies: 13
    • Views: 24,204
    07-02-2011, 06:36 PM Go to last post
  27. Roy's largest root VS all the other ones...

    does anybody know why the statistical significance of Roy's largest root does not imply the statistical significance of the other three popular...

    Started by will22‎, 04-03-2011 05:58 PM
    • Replies: 5
    • Views: 23,940
    04-04-2011, 07:08 AM Go to last post
  28. Arrow Small sample size, correlation

    Ok, I am helping someone to run spss on his data,He just wants to know the results and not advice.But still I am hating my gut because his method...

    Started by SadieKhan‎, 10-11-2010 12:09 AM
    • Replies: 13
    • Views: 23,836
    10-11-2010, 02:31 PM Go to last post
  29. finding the standard deviation and mean from frequency table

    I have a frequency table showing age distribition in Auckland supercity election 2010 and I have in the coloumns I have Age, frequency, percentage,...

    Started by newbiestats‎, 11-10-2011 07:00 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 21,532
    11-12-2011, 03:41 AM Go to last post
  30. Uninformative gamma prior for Poisson distribution

    Hi! I want to use Poisson distribution in my research to model some waiting times and I want to set the gamma prior to its parameter. I want the...

    Started by karamnula‎, 01-16-2011 06:27 AM
    • Replies: 7
    • Views: 21,280
    01-17-2011, 03:16 AM Go to last post
  31. logistic regression : intercept is NOT significative

    Hi everybody I have performed a logistic regression with a stepwise selection. But, at the end, the parameter estimate of intercept is NOT...

    Started by babaorumi‎, 02-28-2009 03:21 PM
    • Replies: 5
    • Views: 20,912
    05-03-2009, 07:26 AM Go to last post
  32. ¿Weighted moments references?

    Hi, I have a sample of frequencies and Sums(totals): Ni Si 23 12345 10 7800 ... Si is the sum over some variable X, measured...

    Started by uozz2‎, 04-14-2013 06:56 AM
    • Replies: 0
    • Views: 20,631
    04-14-2013, 06:56 AM Go to last post
  33. discriminant linear analysis, coefficient interpretation

    Hi everyone, I am trying to weigh the effect of two independent variables (age, gender) on a response variable (pass or fail in a Math's test)....

    Started by parsec2011‎, 03-17-2013 09:57 PM
    • Replies: 2
    • Views: 20,605
    03-19-2013, 02:47 PM Go to last post
  34. Interpreting the "Rotated component matrix" in Varimax Factor Analysis

    So I did Varimax factor analysis for 21 questions in order to group them. As per my understanding the rotated component matrix places each question...

    Started by Susan83‎, 06-06-2013 11:18 PM
    factor analysis
    • Replies: 4
    • Views: 20,604
    06-07-2013, 05:14 PM Go to last post
  35. Permanova - Adonis

    Hi!, :wave: I want to use Adonis in R (non-parametric permutation MANOVA) to test for relationships between bray-curtis distances (dissimilarities I...

    Started by spiderlady‎, 01-27-2011 08:57 PM
    • Replies: 5
    • Views: 20,464
    02-01-2011, 04:52 AM Go to last post
  36. determening normality in repeated measures ANOVA

    Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

    Started by BBD‎, 01-29-2011 01:47 AM
    • Replies: 6
    • Views: 20,386
    07-19-2011, 05:11 AM Go to last post
  37. Regression Equation

    Hi there, Could someone please tell me which values do the following symbols represent in the regression equation: ∆R2 (R Square Change?) ∆F (F...

    Started by Jana‎, 08-09-2008 08:03 AM
    • Replies: 2
    • Views: 19,864
    08-10-2008, 08:16 PM Go to last post
  38. Can I use a chi-square test for this 2x3 contingency table?

    Imagine I want to find out whether there are any differences between male and female participants in their pet choices, and this is my 2x3...

    Started by cidyla‎, 07-26-2012 05:17 PM
    chi-square, proportions
    • Replies: 1
    • Views: 19,683
    07-26-2012, 09:30 PM Go to last post
  39. Is there a minimum number of subjects required for a t-test?

    Hi everyone, I am carrying out a piece of research on the effects of heel pain on the way we walk. I have two groups, 8 in the heel pain group...

    Started by philmyfeet‎, 05-06-2009 04:39 PM
    • Replies: 2
    • Views: 19,476
    05-08-2009, 03:43 AM Go to last post
  40. T-Test vs. Mann-Whitney U Test for ordinal data

    Hello all: Something at work made me wonder about this situation and I thought I'd ask here just to get some opinions. Imagine people were...

    Started by lancearmstrong1313‎, 08-20-2013 02:05 PM
    • Replies: 5
    • Views: 19,454
    08-21-2013, 05:29 AM Go to last post
  41. linear mixed model in SPSS - how?

    Hi guys, Imagine a nonrandomized trial with 2 groups (control and treatment) and two time points (pre and post). An ANOVA of change seems superior...

    Started by BBD‎, 02-02-2011 11:58 AM
    • Replies: 2
    • Views: 19,324
    02-25-2011, 02:56 PM Go to last post
  42. Normal? Bimodal normal? Some other distribution?

    Hello! I am a newbie here. First I want to say HI to everyone! :) And I do have a question here. I am trying to model my data that ideally is...

    Started by statsCZ‎, 12-05-2008 01:31 PM
    • Replies: 4
    • Views: 19,285
    01-28-2009, 08:31 AM Go to last post
  43. matched pairs VS complete randomization - correspondence test housing market

    I work in experimental economics, labor and housing market. I am trying to answer the following question: why do researchers use matched pairs of...

    Started by lukeskywalker84‎, 03-08-2014 09:32 AM
    experiment design, houses, matched pairs, randomization
    • Replies: 0
    • Views: 19,038
    03-08-2014, 09:32 AM Go to last post
  44. ANOVA vs. T-Test --> completely different results

    If I compare three treatment groups with ANOVA (and Bonferroni posttesting), I get no significant difference results between groups (p>0.05)......

    Started by med1234‎, 06-13-2011 02:16 PM
    • Replies: 7
    • Views: 18,773
    06-14-2011, 12:14 AM Go to last post
  45. Model Fit is Too Perfect: RMSEA & CFI are perfect; SRMR varies in invariance analyses

    I am running models looking at the fit of new self-report scale I have developed (CFA and measurement invariance by a number of different categories...

    Started by mem162000‎, 01-15-2014 01:47 PM
    • Replies: 9
    • Views: 18,586
    06-22-2016, 03:37 AM Go to last post
  46. population normally distributed, sample not, parametric test allowesd?

    Hi guys, Imagine I know that my variable of interest (say blood glucose) is normally distributed in the population. But I have a small sample and...

    Started by BBD‎, 12-08-2010 09:19 AM
    • Replies: 8
    • Views: 18,560
    02-19-2011, 07:26 PM Go to last post
  47. Certain sample size needed for HLM?

    I have a data set of test scores and memory scores of 111 students, nested in 12 different classroom. 6 classrooms are from high income areas and 6...

    Started by MTT‎, 11-02-2009 02:44 PM
    • Replies: 3
    • Views: 17,978
    11-04-2009, 10:14 AM Go to last post
  48. Expected Value of a Sample Range

    The function for the expected value of a sample range is given on the following page. http://www.jmu.edu/docs/sasdoc/sashtml/qc/chapc/sect9.htm ...

    Started by Papabravo‎, 10-15-2008 12:27 PM
    • Replies: 7
    • Views: 17,959
    10-16-2008, 07:34 PM Go to last post
  49. Understanding ANOVA requirements better.

    Two ANOVA requirements are 1. Approximately Normal Data 2. Equal Variances Online the normality requirement is often simply stated as the...

    Started by wwreith‎, 04-15-2011 01:34 PM
    • Replies: 2
    • Views: 17,815
    04-17-2011, 07:04 PM Go to last post
  50. 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: 17,747
    03-08-2012, 05:37 AM Go to last post
  51. Multiple Group Analysis necessary?

    Hi, for my master's thesis I collected data with an online survey, measuring consumer behaviour. I used two samples, one group from Australia and...

    Started by robertz‎, 09-01-2010 06:15 AM
    • Replies: 13
    • Views: 16,759
    06-22-2012, 03:05 PM Go to last post
  52. Low Cronbach alpha on recognised instrument

    Hi, I am using a standard survey instrument that during a meta analysis over 15 years has shown a relability of 0.73 for a particular facet. I...

    Started by JakeMac‎, 03-12-2013 06:21 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 16,670
    03-13-2013, 07:08 AM Go to last post
  53. Websites on designing scientific posters

    I have to do a poster presentation in a few weeks and I'm looking for some good sites that might give some advice on designing scientific posters,...

    Started by freebird2008‎, 02-23-2010 03:15 PM
    • Replies: 5
    • Views: 16,551
    05-11-2010, 02:08 AM Go to last post
  54. Mean centering (good bad or ugly?)

    As part of a regression course I have to do mean centering. I looked it up and have read 4-5 articles on it. Generally opinions are skewed in the...

    Started by trinker‎, 10-15-2011 06:48 PM
    • Replies: 8
    • Views: 16,506
    10-16-2011, 12:45 PM Go to last post
  55. chi-square post-hoc tests?

    Hi there, I've been searching the forum and elsewhere to figure out how to interpret my chi-square results and I can't find anything that relates to...

    Started by mogetons‎, 04-13-2011 03:13 PM
    • Replies: 4
    • Views: 16,111
    04-16-2011, 02:54 PM Go to last post
  56. Question Survey Question with 4 Point Likert Scale and Yes/No Question

    Thank you for taking the time out to view my problem. My survey is based on observations and interviews. The observation questions are yes/no type...

    Started by newbie4‎, 12-07-2012 01:24 PM
    calculation, likert scale, yes/no scaling
    • Replies: 4
    • Views: 15,801
    12-10-2012, 01:39 PM Go to last post
  57. Question Is it correct to use Pearson correlation for variables measured on a "Likert scale"?

    Hi All, I'm conducting a research testing the relationship of 2 variables which are measured on agreement scales. Is it correct to use Pearson...

    Started by sachitha‎, 10-04-2010 11:40 AM
    • Replies: 2
    • Views: 15,763
    10-04-2010, 06:41 PM Go to last post
  58. Interpretation of Granger Causality test

    Hi All, I am using granger causality test on two variable A and B (Both becomes stationary after taking first lag) in eviews. I used both the...

    Started by sach_83‎, 04-10-2011 05:28 AM
    • Replies: 0
    • Views: 15,539
    04-10-2011, 05:28 AM Go to last post
  59. What statistical test should I use to check to ratio?

    I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

    Started by ch.niladri‎, 02-09-2011 01:21 AM
    • Replies: 6
    • Views: 15,511
    02-16-2011, 01:37 PM Go to last post
  60. Red face Using likert scale data and nominal, ratio scale data for Partial Correlation

    Hi All, If Pearson correlation is used through Partial Correlation (on SPSS) for measuring variables measured on a Likert Scale, can we use...

    Started by sachitha‎, 10-04-2010 11:43 AM
    • Replies: 3
    • Views: 15,454
    10-07-2010, 08:03 PM Go to last post

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