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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: 18,698
    10-11-2014, 12:02 PM Go to last post
  1. How to test the P-value in this type of situation

    Hi all, this is my first post on the forum... I apologize in advance, this explanation might be a little long...please let me know if anything is...

    Started by joeyb313‎, 03-25-2011 03:42 PM
    • Replies: 2
    • Views: 2,374
    03-25-2011, 04:42 PM Go to last post
  2. Sigma within an averaged group

    I am trying to assess variation in a process in which the sample is too small to measure individually. To get a rough idea of the variation, I have...

    Started by scolbert‎, 03-25-2011 09:28 PM
    • Replies: 0
    • Views: 1,869
    03-25-2011, 09:28 PM Go to last post
  3. Is Levene's transformation with ANOVA equivalent to Levene's W?

    Hello, Just a quick question that I have been pondering: I read an article (Plavcan and Cope, 2001 Evol. Anthro.) where they say that Levene's test...

    Started by amesshaps‎, 03-25-2011 09:36 PM
    anova, levene's test
    • Replies: 0
    • Views: 5,368
    03-25-2011, 09:36 PM Go to last post
  4. Need some help choosing correct statistical method for study

    Hi. I'm about to carry out a study and require suitable statistical method(s) for it. I plan to measure the effect of fluoridation on the growth of...

    Started by rwws22‎, 03-26-2011 10:09 PM
    • Replies: 2
    • Views: 4,652
    03-27-2011, 02:56 AM Go to last post
  5. Please help me with this question

    A company is interested in investing in companies in Hong Kong. They have access to large dataset on the rate of return on assets (expressed in...

    Started by danswe3‎, 03-27-2011 12:46 PM
    • Replies: 1
    • Views: 2,216
    03-27-2011, 01:14 PM Go to last post
  6. Question What is the technique of analyzing pooled cross sectional data?

    Like the title suggests, I have a data set that comprise of several cross sectional waves. The subjects in each wave are different, just to be clear....

    Started by non-sleeper‎, 03-28-2011 02:15 AM
    • Replies: 0
    • Views: 3,560
    03-28-2011, 02:15 AM Go to last post
  7. Survival Analysis with non 0 start time

    I have lifetime observations. I have an observation for all records in the universe, but not all the records will begin with a cohort time 0. ...

    Started by johank‎, 03-28-2011 05:04 PM
    • Replies: 2
    • Views: 4,406
    03-28-2011, 07:11 PM Go to last post
  8. EM Algorithm

    Hi All, I am trying to implement the EM algorithm for a 3 population exponential distribution. I am having the following issues. 1. If l1_true=;9...

    Started by raghustats‎, 03-20-2011 12:27 PM
    • Replies: 1
    • Views: 2,901
    03-28-2011, 07:40 PM Go to last post
  9. ?is there a test for this?

    I have one nominal (disease, no disease) dependent variable and two independent variables I wish to look at regarding whether or not they are...

    Started by Justin Gundara‎, 03-24-2011 07:35 AM
    • Replies: 2
    • Views: 2,094
    03-28-2011, 08:45 PM Go to last post
  10. Choosing Statistical Tests for a Study

    I am designing a study and I am trying to figure out what statistical tests I will need to run. I haven't taken stats in a few years, and my...

    Started by mariejolene‎, 03-22-2011 12:09 AM
    • Replies: 8
    • Views: 5,256
    03-28-2011, 11:41 PM Go to last post
  11. Lightbulb What type of analysis??

    The purpose of my experiment was to study how ultraviolet radiation effects the quality of eggs. My explanatory variables are: 1) The distance at...

    Started by ayo jay jo‎, 03-29-2011 10:53 AM
    • Replies: 1
    • Views: 2,070
    03-29-2011, 07:11 PM Go to last post
  12. interval censored data using bootstrap method

    I have time Xi that is interval censored and the data consist of time intervals Ii = such that Xi is within Ii , Ri>Li, i=1,...,96 My interest is...

    Started by zzzc‎, 03-16-2011 08:35 PM
    • Replies: 2
    • Views: 4,838
    03-29-2011, 09:09 PM Go to last post
  13. Questions about approach

    Hi, I am working with a large data set with all categorical variables except for age, which I will want to group in to age bands. I think I am...

    Started by Byrnethau‎, 03-29-2011 01:45 PM
    different chisq tests
    • Replies: 2
    • Views: 2,319
    03-29-2011, 09:23 PM Go to last post
  14. 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: 1,648
    03-30-2011, 05:51 AM Go to last post
  15. 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: 5,671
    03-30-2011, 02:38 PM Go to last post
  16. 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: 2,402
    03-30-2011, 06:24 PM Go to last post
  17. 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: 1,850
    03-30-2011, 08:46 PM Go to last post
  18. 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: 12,794
    03-31-2011, 07:02 AM Go to last post
  19. 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: 2,838
    03-31-2011, 10:49 AM Go to last post
  20. 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: 2,050
    04-01-2011, 06:20 AM Go to last post
  21. 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: 5,546
    04-01-2011, 03:35 PM Go to last post
  22. 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: 23,005
    04-04-2011, 07:08 AM Go to last post
  23. 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: 4,104
    04-04-2011, 11:53 PM Go to last post
  24. 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: 3,226
    04-05-2011, 05:19 AM Go to last post
  25. 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: 3,225
    04-05-2011, 03:52 PM Go to last post
  26. 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: 4,507
    04-05-2011, 07:38 PM Go to last post
  27. 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: 2,664
    04-06-2011, 11:00 AM Go to last post
  28. 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: 5,555
    04-06-2011, 08:11 PM Go to last post
  29. 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: 2,728
    04-07-2011, 04:36 PM Go to last post
  30. 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: 3,492
    04-07-2011, 07:38 PM Go to last post
  31. 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
    sampling
    • Replies: 0
    • Views: 6,191
    04-08-2011, 06:50 AM Go to last post
  32. 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: 217,183
    04-08-2011, 08:17 AM Go to last post
  33. 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: 7,738
    04-08-2011, 02:24 PM Go to last post
  34. 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: 3,511
    04-08-2011, 04:05 PM Go to last post
  35. 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: 2,656
    04-09-2011, 11:27 AM Go to last post
  36. 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: 2,529
    04-09-2011, 04:48 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: 14,903
    04-10-2011, 05:28 AM Go to last post
  38. 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: 4,235
    04-10-2011, 07:13 PM Go to last post
  39. 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: 3,181
    04-11-2011, 06:32 AM Go to last post
  40. 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: 3,315
    04-11-2011, 05:29 PM Go to last post
  41. 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: 4,371
    04-12-2011, 11:26 AM Go to last post
  42. 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: 3,594
    04-12-2011, 01:10 PM Go to last post
  43. 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: 3,862
    04-12-2011, 10:59 PM Go to last post
  44. 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: 3,647
    04-14-2011, 10:15 AM Go to last post
  45. 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: 15,504
    04-16-2011, 02:54 PM Go to last post
  46. 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: 2,397
    04-17-2011, 11:20 AM Go to last post
  47. 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: 17,040
    04-17-2011, 07:04 PM Go to last post
  48. 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: 4,933
    04-17-2011, 09:30 PM Go to last post
  49. 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: 4,284
    04-19-2011, 12:28 PM Go to last post
  50. 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: 2,325
    04-21-2011, 09:25 AM Go to last post
  51. 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: 1,999
    04-21-2011, 09:42 AM Go to last post
  52. 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: 5,813
    04-21-2011, 01:37 PM Go to last post
  53. 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: 1,908
    04-21-2011, 08:13 PM Go to last post
  54. 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: 3,034
    04-22-2011, 06:34 PM Go to last post
  55. 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: 2,121
    04-22-2011, 07:49 PM Go to last post
  56. 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: 2,088
    04-23-2011, 01:28 AM Go to last post
  57. 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: 4,797
    04-25-2011, 09:33 PM Go to last post
  58. 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: 1,605
    04-26-2011, 12:13 AM Go to last post
  59. 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: 3,412
    04-27-2011, 11:02 PM Go to last post
  60. 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: 3,633
    04-27-2011, 11:13 PM Go to last post

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