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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: 18,750
    10-11-2014, 12:02 PM Go to last post
  1. Correlation in contentency tables using determinants??????

    "This paper suggests a measure of association (or correlation) between nominal data. It relies on the use of determinants. The general idea is that...

    Started by SandraM‎, 05-05-2011 09:06 AM
    • Replies: 0
    • Views: 1,696
    05-05-2011, 09:06 AM Go to last post
  2. Event study t-test help

    Hi, Im doing a report about clinical trials and abnormal effect returns on the stock market. I have collected 7 events with an eventwindow of -5...

    Started by Patark‎, 05-04-2011 03:14 PM
    • Replies: 0
    • Views: 3,609
    05-04-2011, 03:14 PM Go to last post
  3. Any suggestion: book on score test?

    Hi. I'm trying to understand what is a score test to test certain model based on discrete distribution. So far i manage to find only score statistic...

    Started by tsukiko‎, 05-04-2011 09:05 AM
    • Replies: 0
    • Views: 2,108
    05-04-2011, 09:05 AM Go to last post
  4. Which statistic to use to determine gender differences in rankings?

    The scenario: 50 men and 50 women are asked to rank a list of ten vegetables in order of preference (1=favorite, 10=least favorite). I want to...

    Started by jdeisenberg‎, 05-03-2011 10:48 PM
    • Replies: 1
    • Views: 2,139
    05-04-2011, 12:10 AM Go to last post
  5. Can they called unequal sample sizes and t-test/ANOVA?

    I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

    Started by cookiemonster‎, 05-02-2011 03:09 AM
    • Replies: 0
    • Views: 2,769
    05-02-2011, 03:09 AM Go to last post
  6. Analyzing Likert scale

    Hi, I am doing my research on QWL prevailing in Industry. I have collected data through questionnaire on 5 point likert scale, 1=strongly disagree...

    Started by JSahni‎, 04-29-2011 03:10 PM
    • Replies: 4
    • Views: 11,063
    05-01-2011, 07:56 AM Go to last post
  7. Pca

    Hi guys, There is something basic I don't understand about PCA, maybe you can explain it to me in simple words. After getting the components...

    Started by WeeG‎, 05-01-2011 04:02 AM
    • Replies: 0
    • Views: 1,942
    05-01-2011, 04:02 AM Go to last post
  8. need help in determining appropriate sample size

    Hi: I need help in calculating Sample size for my study. I am aiming to collect survey response for leadership study from different firms located...

    Started by Hassan‎, 05-01-2011 12:56 AM
    • Replies: 0
    • Views: 1,787
    05-01-2011, 12:56 AM Go to last post
  9. Sports Board Using Statistics Incorrectly?

    Our state sports board has declared a competitive imbalance between public and private schools, and are taking swift action to correct it. This...

    Started by truespace‎, 04-30-2011 08:09 PM
    • Replies: 0
    • Views: 1,506
    04-30-2011, 08:09 PM Go to last post
  10. Getting desperate, please help!

    I have a research project and I am really confused on what I should do with the data. I asked people to complete a survey. The survey had 10...

    Started by blueirony‎, 04-28-2011 06:20 AM
    • Replies: 1
    • Views: 1,587
    04-29-2011, 04:26 PM Go to last post
  11. Testing assumptions

    Hi, I would greatly appreciate it if some-one would point me in the right direction. I have to critique the statistical methods used in a few...

    Started by Mac2‎, 04-28-2011 01:40 PM
    • Replies: 2
    • Views: 2,327
    04-29-2011, 08:12 AM Go to last post
  12. please help- getting desperate

    Hi I am doing a masters in health and need to analyse data I have. I basically have 2 groups, 1 group immunised (2500) and one group not (1000). I...

    Started by mels‎, 04-27-2011 11:31 AM
    • Replies: 2
    • Views: 2,368
    04-28-2011, 01:48 PM Go to last post
  13. T-test appropriate?

    Hello all, I have a big dataset which I divided into different periods (years) and focused on one group. I calculated the means for the different...

    Started by zerostin‎, 04-26-2011 11:35 AM
    • Replies: 3
    • Views: 2,432
    04-28-2011, 06:33 AM Go to last post
  14. non-parametric equivalent for mixed-factorial design

    I have to analyze my confidence data which is measured using a likert scale (1 7). Because its ordinal in nature, I need to use non-parametric...

    Started by gradstudent87‎, 04-27-2011 04:12 PM
    • Replies: 2
    • Views: 3,640
    04-27-2011, 11:13 PM Go to last post
  15. Statistical Independence

    I'm trying to give my students a brief introduction to chi-square testing, but there's something that's a little confusing to me regarding the...

    Started by alphaqn69‎, 04-08-2011 04:38 PM
    • Replies: 1
    • Views: 3,423
    04-27-2011, 11:02 PM Go to last post
  16. Help with deciding upon a test

    Usually I'm pretty good with figuring out what test to use but this has me puzzled: I'm more familiar with the ANOVA camp than the regression camp...

    Started by trinker‎, 04-25-2011 10:32 PM
    • Replies: 2
    • Views: 1,615
    04-26-2011, 12:13 AM Go to last post
  17. PCA latent variables

    For exploratory purposes, should PCA (Principal Component Analysis) be done for one latent variable at a time or should it done for all the latent...

    Started by rajarshic‎, 04-25-2011 10:59 AM
    latent construct, latent variable, pca
    • Replies: 3
    • Views: 4,811
    04-25-2011, 09:33 PM Go to last post
  18. Question At Wits End

    Hi, I am doing a research report as a requirement for the course I am doing. Professor provided us with data and it's up to us to establish a...

    Started by statnewbie‎, 04-22-2011 11:45 PM
    • Replies: 2
    • Views: 2,101
    04-23-2011, 01:28 AM Go to last post
  19. Please help!

    Hi, I am doing a project at university dealing with some new experimental data that I could use a few hints on to get started. The data is for...

    Started by Lugz McPie‎, 04-22-2011 11:54 AM
    • Replies: 2
    • Views: 2,127
    04-22-2011, 07:49 PM Go to last post
  20. Likert scale - questionnaire administered twice - longitudinal study

    Hi, I am running a longitudinal study which lasted for few months during which all participants used a specific communicaiton device. I conducted...

    Started by A_n_y_a‎, 04-21-2011 03:18 PM
    administered twice, likert scale, longitudinal study, questionnaire
    • Replies: 1
    • Views: 3,039
    04-22-2011, 06:34 PM Go to last post
  21. Letters denoting significant multiple comparisions in a table

    Please ignore question no longer need help - thank you for all of your responses!

    Started by Rose1226‎, 04-21-2011 08:13 PM
    • Replies: 0
    • Views: 1,914
    04-21-2011, 08:13 PM Go to last post
  22. 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: 5,835
    04-21-2011, 01:37 PM Go to last post
  23. Missing data analysis

    Hello, I have a longitudinal study with a very high drop-out. At Time 1, I have 93 participants, but only 47 of them took part at Time 2. Now,...

    Started by Annelie‎, 04-21-2011 09:07 AM
    • Replies: 1
    • Views: 2,020
    04-21-2011, 09:42 AM Go to last post
  24. How to choose the good hypothesis test: Correlation or simple Regression?

    Hi, I have two questions for you on which I have issues: - Should I use the correlation test or the simple regression test for this hypothesis:...

    Started by Robjam‎, 04-21-2011 09:25 AM
    • Replies: 0
    • Views: 2,335
    04-21-2011, 09:25 AM Go to last post
  25. z-test rule.

    Hello, I am a new user in this forum. I am wondering whether I can use z-test for a small amount of data, Let us say, "English and Math marks" for...

    Started by littledic‎, 04-19-2011 12:04 PM
    • Replies: 5
    • Views: 4,317
    04-19-2011, 12:28 PM Go to last post
  26. Bayesian inference, MAP and sampling (Gibbs)

    Hi all I'm applying bayes inference to a GMM, based on some data set. I'm using Gibbs sampling to get the "samples" from the posteriors (the mean's...

    Started by avima‎, 04-12-2011 11:53 AM
    • Replies: 6
    • Views: 4,948
    04-17-2011, 09:30 PM Go to last post
  27. 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: 17,092
    04-17-2011, 07:04 PM Go to last post
  28. EM algorithm - estimation

    Hi. I try to implement EM algorithm for multivariate missing values, but i have problem with estimating function. Suppose is mean vector, Σ is...

    Started by kaczan‎, 04-17-2011 11:20 AM
    • Replies: 0
    • Views: 2,408
    04-17-2011, 11:20 AM Go to last post
  29. 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: 15,564
    04-16-2011, 02:54 PM Go to last post
  30. How to Adjust Frequency Table Range

    I have a set of data and am trying to find the best ranges to create a frequency table/chart. As I change the first interval, the frequency table...

    Started by therichard‎, 04-14-2011 10:15 AM
    • Replies: 0
    • Views: 3,654
    04-14-2011, 10:15 AM Go to last post
  31. what to do for unknown PDFs.

    Hi guys 1) When we are performing signal detection , and we have received this y(n)=x(n)+z(n) for n=0,1,2,3...., where z is gaussian noise, but...

    Started by sibtain125‎, 04-12-2011 10:59 PM
    • Replies: 0
    • Views: 4,008
    04-12-2011, 10:59 PM Go to last post
  32. Statistical test for two Maxwell-Boltzmann distributions

    Suppose we have two processes A and B, and N subjects, x_i. A(x) is distributed as a Maxwell-Boltzmann distribution with scale parameter alpha_a;...

    Started by xygorn‎, 04-12-2011 10:57 AM
    maxwell-boltzmann, scale parameter, statistical test
    • Replies: 2
    • Views: 3,606
    04-12-2011, 01:10 PM Go to last post
  33. EM Algorithm for Gaussian Mixture model fitting data with missing values

    I have an EM function that will take regular data with no missing values, and compute means, standard deviations, and probabilities of components of...

    Started by zzzc‎, 03-31-2011 09:15 PM
    • Replies: 1
    • Views: 4,385
    04-12-2011, 11:26 AM Go to last post
  34. Distribution not normal

    Hello, The Shapiro-Wilk test of normality on my data indicates that the distribution is not normal. I have tried to compute the data, but I...

    Started by dissstat1‎, 04-08-2011 08:07 PM
    • Replies: 4
    • Views: 3,326
    04-11-2011, 05:29 PM Go to last post
  35. Grade (A, A-, B+, B, B-....)

    Im planning to do run some correlation and different groups stat test on my data. In my all scenarios, Grade is a dependent variable. So, my question...

    Started by studentdoctor‎, 03-16-2011 12:55 PM
    • Replies: 2
    • Views: 3,194
    04-11-2011, 06:32 AM Go to last post
  36. Question What tests should I use to analyze my data? Immediate input appreciated

    Hello TalkStats members :wave: I have some data I need to analyze. I first would like to say I hope I am posting this in the correct sub-forum,...

    Started by IDmedicine‎, 04-10-2011 03:48 PM
    unequal sample size, wilcoxon
    • Replies: 2
    • Views: 4,273
    04-10-2011, 07:13 PM Go to last post
  37. 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: 14,943
    04-10-2011, 05:28 AM Go to last post
  38. Hello Everyone, need stats help

    Hello everyone, :wave: I'm new to this forum. I need some help figuring out what kind of analysis to run for my undergraduate thesis. I did...

    Started by Rob at U of T‎, 04-09-2011 04:48 PM
    • Replies: 0
    • Views: 2,543
    04-09-2011, 04:48 PM Go to last post
  39. Post PAVA - isotonic regression

    Hello, I'm searching for a research, and I hope I can get your help. I have an article showing an estimator for a cdf F, Fn, based on a function...

    Started by nunoadiga‎, 04-09-2011 11:27 AM
    • Replies: 0
    • Views: 2,664
    04-09-2011, 11:27 AM Go to last post
  40. Help w/survey results!

    I am hoping someone can help me figure out how to do the following: I am a member of my child's school's accountability committee, and as such we...

    Started by astro_girl‎, 04-07-2011 07:18 PM
    • Replies: 4
    • Views: 3,533
    04-08-2011, 04:05 PM Go to last post
  41. Correction for multiple testing when tests are dependent

    Dear all, I have a following problem: given N variables, I calculate N(N-1)/2 correlation coefficients, each against each (this is commonly used...

    Started by jw3‎, 04-08-2011 04:24 AM
    • Replies: 3
    • Views: 7,789
    04-08-2011, 02:24 PM Go to last post
  42. 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: 217,232
    04-08-2011, 08:17 AM Go to last post
  43. Red face Rolling or continuous surveying or sampling

    I have been looking everywhere for an answer to this problem, so far with no luck. Hopefully the statistics gurus on this board will know the...

    Started by jasoncs‎, 04-08-2011 06:50 AM
    • Replies: 0
    • Views: 6,218
    04-08-2011, 06:50 AM Go to last post
  44. Need help to test the significance

    I want to make a test to see if the difference is significant or not. What I have is two different groups of values (one with 31 values and the other...

    Started by Lisa A‎, 03-29-2011 04:21 AM
    p-value, significance, ttest, ttest in excel
    • Replies: 5
    • Views: 3,505
    04-07-2011, 07:38 PM Go to last post
  45. Statistical matching

    Hi Folks, Am New to this statistical analysis domain, but have a problem at hand. I have a list of movies and each movie have various attributes...

    Started by amit_tomar‎, 04-07-2011 04:36 PM
    • Replies: 0
    • Views: 2,745
    04-07-2011, 04:36 PM Go to last post
  46. 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: 5,571
    04-06-2011, 08:11 PM Go to last post
  47. Which test should I use?

    Working on a medicine research paper here, really hoping someone can help me out. I have a group of patients for which I have data relating to...

    Started by MastahRiz‎, 03-28-2011 10:32 PM
    • Replies: 5
    • Views: 2,674
    04-06-2011, 11:00 AM Go to last post
  48. Formula of Return

    I am new at Business Research, i have a problem that i am not sure about the formula of calculating return. Can you please help me confirm that...

    Started by SFranck‎, 04-05-2011 03:44 PM
    formula of return
    • Replies: 1
    • Views: 4,516
    04-05-2011, 07:38 PM Go to last post
  49. crosstabs -

    I have a crosstabs with two categorical variables. 6 columns x 4 rows. Data are proportions, not means. Basic chi-square shows me that the...

    Started by msafns‎, 04-05-2011 03:52 PM
    • Replies: 0
    • Views: 3,251
    04-05-2011, 03:52 PM Go to last post
  50. 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: 3,236
    04-05-2011, 05:19 AM Go to last post
  51. Finding SD given mean and n

    I am looking at data from State Assessment results and would like to compare means for schools. The problem is that the data that is given does not...

    Started by trinker‎, 04-04-2011 10:59 PM
    • Replies: 2
    • Views: 4,139
    04-04-2011, 11:53 PM Go to last post
  52. 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: 23,086
    04-04-2011, 07:08 AM Go to last post
  53. 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: 5,572
    04-01-2011, 03:35 PM Go to last post
  54. Significance Testing Material

    Hi I am new to this forum. Can any body let me know about the material for Significant Testing? I would like to have a training for our team on...

    Started by sastrypvn‎, 04-01-2011 06:20 AM
    • Replies: 0
    • Views: 2,054
    04-01-2011, 06:20 AM Go to last post
  55. SEM - model fit question

    Hello all, my first post here. I was hoping that you could help me decide whether to decide for one model or another. Both have good fitting...

    Started by Anabela‎, 03-09-2011 02:54 PM
    • Replies: 2
    • Views: 2,856
    03-31-2011, 10:49 AM Go to last post
  56. Regression line slope for R^2 ~= 1

    Sorry if my question is answered in textbooks! I was wondering what the slope would be for the regression line of a regression that has an R squared...

    Started by wildetudor‎, 03-28-2011 12:21 PM
    • Replies: 9
    • Views: 12,829
    03-31-2011, 07:02 AM Go to last post
  57. Question Seeking Organized Centralized Statistical Database with data w/ geographic relations

    My apologies for the long title, I do not know how to word this. Are there any good, centralized, geographically & time related (e.g. avg male...

    Started by mcallm‎, 03-30-2011 08:46 PM
    • Replies: 0
    • Views: 1,865
    03-30-2011, 08:46 PM Go to last post
  58. 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: 2,410
    03-30-2011, 06:24 PM Go to last post
  59. 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: 5,692
    03-30-2011, 02:38 PM Go to last post
  60. Modelling Categories and Data

    Hi, any help would be greatly appreciated. I am trying to create growth models for different tree species which correlate tree weight with height....

    Started by Forestry‎, 03-30-2011 05:51 AM
    • Replies: 0
    • Views: 1,655
    03-30-2011, 05:51 AM Go to last post

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