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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: 19,447
    10-11-2014, 12:02 PM Go to last post
  1. Sample size...

    have found numerous on-line calculators and have read through some forum postings but am now more confused than ever. I have been asked to...

    Started by mysterymouse‎, 05-19-2009 11:43 PM
    • Replies: 1
    • Views: 3,932
    05-20-2009, 09:13 AM Go to last post
  2. low coefficient alpha

    Hello, I have a question about coefficient alpha. How does having a low alpha effect your statistical tests if you are running say an ANOVA or a...

    Started by psychologygirl‎, 05-19-2009 11:19 AM
    • Replies: 0
    • Views: 4,885
    05-19-2009, 11:19 AM Go to last post
  3. Need help on sampling

    I am very new to statistics so forgive my ignorance...I just need some help to get pointed in the right direction. I need to take some baseline...

    Started by cosmit‎, 05-19-2009 07:34 AM
    • Replies: 0
    • Views: 2,194
    05-19-2009, 07:34 AM Go to last post
  4. grouping doubt

    Hi , I am new to base sas trying to learn on my own , I have a doubt , I have a data set which contains the information about the firms , they...

    Started by singhakshay1710‎, 05-12-2009 09:41 PM
    • Replies: 0
    • Views: 2,199
    05-12-2009, 09:41 PM Go to last post
  5. Can't find a convenient test for this huge dataset :-(

    Hi everyone, I have some trouble choosing the right test for the following study: I have a group of parents and a lot of ordinal measures. I...

    Started by Abdel‎, 05-12-2009 08:55 PM
    • Replies: 0
    • Views: 2,949
    05-12-2009, 08:55 PM Go to last post
  6. Cut-off

    I am reading an article where 5 has been set as a cut-off score. No > or >= symbols are given, and I don't know whether a score of 5 would identify...

    Started by apple‎, 05-12-2009 08:03 AM
    • Replies: 0
    • Views: 2,647
    05-12-2009, 08:03 AM Go to last post
  7. Need a meaningful way to describe heavily-skewed numbers for 50 states

    Hi there, I apologize if this is an insultingly stupid question, but I managed to enroll in a political research class that involved very little...

    Started by dunnsidhe‎, 05-11-2009 04:14 PM
    • Replies: 0
    • Views: 1,676
    05-11-2009, 04:14 PM Go to last post
  8. ANOVA v t-test

    My understanding is that the t-test is a special case of a oneway ANOVA. I am confused by highly discrepant results when comparing the means of 2...

    Started by rob c‎, 05-10-2009 07:00 PM
    • Replies: 2
    • Views: 4,323
    05-10-2009, 09:12 PM Go to last post
  9. Multivariate Gaussian Distributions

    I am interested in understanding Multivariate Gaussian Distributions. I am a (young) Computer Scientist looking to implement the EM algorithm for...

    Started by xnull‎, 05-10-2009 02:42 PM
    • Replies: 0
    • Views: 2,247
    05-10-2009, 02:42 PM Go to last post
  10. gender differences

    Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

    Started by 12345678‎, 04-10-2009 01:08 AM
    • Replies: 6
    • Views: 5,162
    05-09-2009, 07:40 PM Go to last post
  11. Smoothing algorithm for times series and slope measurement

    Hi, I'm doing an experiment that gathers one data point approximately each second. I have plotted all the datapoints on a graph. The graph has...

    Started by nickmath‎, 05-09-2009 08:46 AM
    • Replies: 0
    • Views: 2,063
    05-09-2009, 08:46 AM Go to last post
  12. Question Perception of non-parametric techniques as inferior?

    Hi guys, I've recently worked on a project supervised by a lecturer in the school of psychology at my university. She's been looking over the...

    Started by CowboyBear‎, 05-07-2009 02:55 AM
    • Replies: 3
    • Views: 9,838
    05-08-2009, 06:17 AM Go to last post
  13. which correlation for a PCA?

    I have data that has both discreet and continuous variables and, that are highly variable, not entirely independent of each other and some aren't...

    Started by madhatter‎, 05-08-2009 05:11 AM
    • Replies: 0
    • Views: 3,917
    05-08-2009, 05:11 AM Go to last post
  14. 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: 19,489
    05-08-2009, 03:43 AM Go to last post
  15. comparing two charts

    Hi, i am new in forum and i am an amateur in Statistics. I have two data sets of the same thing and i want to compare them. For example i have 20...

    Started by stathi02‎, 05-06-2009 11:12 AM
    • Replies: 3
    • Views: 3,060
    05-06-2009, 05:20 PM Go to last post
  16. t-tests or mann-whitney??

    Hello, I have a n=12 sample (and a matched-sample of 12)... I was planning on using t-tests, but now reconsidering it. Would it be correct to use...

    Started by zxcvbnm‎, 03-28-2009 02:16 PM
    • Replies: 2
    • Views: 9,002
    05-03-2009, 06:41 PM Go to last post
  17. 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: 20,917
    05-03-2009, 07:26 AM Go to last post
  18. OLS assumptions after estimating robust standard errors

    Hello everybody, To counter problems with outliers and heteroscedasticity, I have computed an OLS with robust standard errors (using the "robust"...

    Started by andony‎, 04-29-2009 10:54 AM
    • Replies: 1
    • Views: 3,369
    05-01-2009, 12:43 AM Go to last post
  19. Current Commentary Study

    Hi what is it a Current commentary study ??? What does it mean ??? Regards

    Started by viwel‎, 04-28-2009 07:05 AM
    • Replies: 2
    • Views: 3,042
    04-30-2009, 07:52 AM Go to last post
  20. Lightbulb Obtaining Residuals in Chi Square Goodness of Fit

    Another question re: goodness of fit testing, Is the procedure for obtaining standardized residuals the same ? The PhD student who leads the...

    Started by Fred‎, 04-27-2009 11:13 AM
    • Replies: 4
    • Views: 4,726
    04-28-2009, 11:01 AM Go to last post
  21. What statistic to use?

    I am reviewing the statistics we currently use at work to ensure that we are using the correct statistics. The scenario is: a. We produce...

    Started by elisayoung‎, 04-27-2009 07:19 PM
    • Replies: 1
    • Views: 3,611
    04-28-2009, 01:13 AM Go to last post
  22. Is the 2-independent group T test ok?

    I would like a suggestion on what analysis to run for my data, and whether a 2-independent sample T test is ok to do because my dependent variable is...

    Started by needinghelp‎, 04-25-2009 03:40 PM
    • Replies: 0
    • Views: 2,775
    04-25-2009, 03:40 PM Go to last post
  23. Sampling Method? Too many schools to sample

    I am part of a research team looking at the outcomes of a homework help program and would like to make a few suggestions of how to generate data. ...

    Started by Zooi‎, 04-24-2009 11:07 AM
    • Replies: 0
    • Views: 2,474
    04-24-2009, 11:07 AM Go to last post
  24. Meta-analyses

    Hi following you, is there a minimum of paper / study / publication to write a meta-analyse ??? Do you know something to evaluate a meta-analyse...

    Started by viwel‎, 04-21-2009 09:15 AM
    • Replies: 0
    • Views: 2,168
    04-21-2009, 09:15 AM Go to last post
  25. statistical power of a General Linear Mixed Model with repeated measurements

    Hello, I would like to be able to calculate the statistical power of a General Linear Mixed Model. This model is applied on longitudinal data on...

    Started by alstublieft‎, 04-15-2009 07:37 AM
    • Replies: 0
    • Views: 3,975
    04-15-2009, 07:37 AM Go to last post
  26. Exclamation What kind of sample is this one?

    I am doing some research so I need an information about how to describe this sample: 1. respondents were drawn from internet providers which have...

    Started by lustforknowlg‎, 04-11-2009 08:28 AM
    • Replies: 0
    • Views: 2,421
    04-11-2009, 08:28 AM Go to last post
  27. Help: relationship between Regime type and war

    Hy guys, i have a question and it's really important. I have to study the relationship between regime type and intrastate war. the dataset from...

    Started by bavarois‎, 04-08-2009 10:21 AM
    • Replies: 0
    • Views: 2,626
    04-08-2009, 10:21 AM Go to last post
  28. Question Calculating a P-value for a two-tailed One-Standard-Deviation chi-square Test

    How does one calculate a P-value for a two-tailed One-Standard-Deviation chi-square Test? Before we begin, I would like to say thank you for...

    Started by damienpf‎, 04-04-2009 12:32 PM
    • Replies: 0
    • Views: 12,594
    04-04-2009, 12:32 PM Go to last post
  29. Two Variables, Many Components :( Type 1 Error?

    Hey, Have spent ages trawling through the threads before I decide I would have to bother everyone with yet another question from a dissertation...

    Started by Elle_Belle‎, 03-28-2009 09:11 AM
    • Replies: 0
    • Views: 2,763
    03-28-2009, 09:11 AM Go to last post
  30. Question Changing from 5-point to 3-point scale

    We are considering changing our guest satisfaction survey from a 5-point scale to a 3-point scale. What is the likely affect on "Top Box" scores? In...

    Started by Redhat‎, 03-26-2009 08:12 AM
    • Replies: 0
    • Views: 5,860
    03-26-2009, 08:12 AM Go to last post
  31. Difference in coefficients between regressions?

    Hi - I'm looking for a way to test whether the beta coefficients are significantly different between two regression analyses. For example:...

    Started by dave25‎, 03-19-2009 11:37 PM
    • Replies: 1
    • Views: 10,574
    03-25-2009, 11:55 PM Go to last post
  32. Help please!

    Hi, im new to this forum and i am a psychology student who is in the middle of my dissertation and it has reached the point that i need to start my...

    Started by Ems86‎, 03-25-2009 03:16 PM
    • Replies: 1
    • Views: 1,698
    03-25-2009, 11:08 PM Go to last post
  33. Scaling technique

    A friend of mine, a Ph.D. student, seeks my advice on the appropriate scaling technique that can be used for his research. The research involves...

    Started by Dr.Appalayya‎, 03-25-2009 04:10 AM
    • Replies: 0
    • Views: 3,853
    03-25-2009, 04:10 AM Go to last post
  34. About the distribution of confidence interval for Weibull

    Does anyone have an idea about the distribution of the 95% confidence intervals for a population with a Weibull distribution? Thanks in advance!

    Started by ppmovie‎, 03-23-2009 06:18 PM
    • Replies: 0
    • Views: 3,653
    03-23-2009, 06:18 PM Go to last post
  35. sufficient statistic for joint geometric distribution

    I wonder if someone could check the attached document regarding my attempt at a Fisher-Neyman factorization of a joint geometric pdf. Thanks Rob

    Started by rob c‎, 03-20-2009 05:16 PM
    • Replies: 1
    • Views: 7,678
    03-22-2009, 08:55 AM Go to last post
  36. Isotonic Regression

    Hello, I would like to ask if someone knows the answers to the next questions: 1. When do I use Isotonic Regression and why ? 2. What's the...

    Started by WeeG‎, 03-20-2009 04:19 PM
    • Replies: 0
    • Views: 3,248
    03-20-2009, 04:19 PM Go to last post
  37. 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: 5,743
    03-19-2009, 12:07 AM Go to last post
  38. Testing for Developmental Significance

    Please help with my current research analysis. I am studying university students' frequency us, confidence, and success at various study...

    Started by owen7‎, 03-16-2009 02:46 PM
    • Replies: 0
    • Views: 2,513
    03-16-2009, 02:46 PM Go to last post
  39. might be a stupid question...

    I am comparing 2 groups (matched sample) with t-tests and am noticing that there is no significant difference. However the st. deviations of each...

    Started by zxcvbnm‎, 03-15-2009 01:18 PM
    • Replies: 2
    • Views: 4,234
    03-16-2009, 11:07 AM Go to last post
  40. 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: 6,181
    03-16-2009, 05:52 AM Go to last post
  41. Jackknife

    I tried to find a specific example of an application of the 'jackknife' command on google, but didn't find any so far. Someone has one? For...

    Started by hfwd‎, 02-28-2009 10:14 AM
    • Replies: 2
    • Views: 4,862
    03-15-2009, 10:11 AM Go to last post
  42. best presentation of data to aid analysis

    Hello, I need some help with formulating a methodology for my current dissertation. I am investigating the impact of ability setting on students....

    Started by Gemstar‎, 03-12-2009 02:02 AM
    • Replies: 0
    • Views: 2,288
    03-12-2009, 02:02 AM Go to last post
  43. Finding relationship between 2 curves over time

    Hi guys, Awesome forum! My question does not look too complicated, but around my research centre here nobody knows what to do with my problem......

    Started by ehestigoni‎, 03-08-2009 05:49 PM
    • Replies: 1
    • Views: 3,911
    03-11-2009, 05:40 PM Go to last post
  44. Need large data sets

    Hello, I'm doing some Q/A work on a new app for data visualization. I can generate my own random data sets, but I'd like to use some real-world...

    Started by Wornways‎, 03-01-2009 03:40 AM
    • Replies: 2
    • Views: 2,944
    03-10-2009, 05:55 PM Go to last post
  45. 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: 6,005
    03-10-2009, 04:57 PM Go to last post
  46. Which test should I use?

    Hi I made repeat measurements of depth and velocity at ~700 locations in a river at three different flow rates. The data was clustered at each...

    Started by CarolineWallis‎, 03-09-2009 11:58 AM
    • Replies: 1
    • Views: 2,378
    03-09-2009, 02:33 PM Go to last post
  47. Event Clustering in an Event Study

    Dear All, I conducted an Event-Study to assess price effects. Now the result show widely fluctuating abnormal returns. Since the event-date across...

    Started by Christoph‎, 02-06-2009 02:20 AM
    • Replies: 1
    • Views: 10,008
    03-09-2009, 08:41 AM Go to last post
  48. Post Help in study design! URGENT!

    Suppose I do a retrospective review of patients records of two groups of patients.. one with diagnosis A and the other group with diagnosis B. And I...

    Started by afrasyabkhan‎, 03-08-2009 03:38 AM
    • Replies: 0
    • Views: 2,608
    03-08-2009, 03:38 AM Go to last post
  49. Help?

    I have a survey of college students in which I created individual weights to account for differences in Age, Gender, Race, and degree level, so...

    Started by lisa131067‎, 03-07-2009 08:35 PM
    • Replies: 0
    • Views: 1,912
    03-07-2009, 08:35 PM Go to last post
  50. need urgent help! how analyze data?

    Hi there, I hope anyone can help... Have been looking up text-book after text-book without getting the info I need! I am trying to analyze some...

    Started by SurveyQueen‎, 03-07-2009 10:56 AM
    • Replies: 0
    • Views: 2,729
    03-07-2009, 10:56 AM Go to last post
  51. Dissertation confusion!

    Hi there guys, i'm new so hopefully i'll get enough information down here for you, any questions then just ask! Ok so here's the deal... i'm a...

    Started by Swarley‎, 03-06-2009 04:22 PM
    • Replies: 0
    • Views: 2,530
    03-06-2009, 04:22 PM Go to last post
  52. stat treatment for yes no questions

    I'm an education student and doing a thesis on vocabulary competence of select students. I only know basic statistics. What statistical treatment is...

    Started by duckie23‎, 03-01-2009 10:02 AM
    • Replies: 2
    • Views: 10,016
    03-06-2009, 02:57 PM Go to last post
  53. Appropriate Statistical Analysis

    Hello, I am getting ready to take comprehensive exams for my Master's Degree and have not had statistics in four years. I need some assistance in...

    Started by arkcomputers‎, 03-03-2009 01:47 PM
    • Replies: 4
    • Views: 4,231
    03-04-2009, 12:39 AM Go to last post
  54. hypothesis testing for least squares fitting

    I have a spectrum that is composed of several things. I do least squares fitting in order to determine the amount of each component. For example: ...

    Started by llee‎, 02-11-2009 11:00 AM
    • Replies: 8
    • Views: 7,392
    03-02-2009, 10:30 AM Go to last post
  55. Discriminant analysis with mostly incomplete cases

    Hello. I have a bit of a biostats problem. Ive got data on 5 groups and 15 species. There are 9 variables, and 1000 cases total. The problem,...

    Started by Dorquemada‎, 01-29-2009 07:01 PM
    • Replies: 6
    • Views: 3,130
    03-02-2009, 12:52 AM Go to last post
  56. How do i add 5 spss freq count tables together?

    Please can anyone help? I use spss (DOS version) and need to add five variables together. THey are all the same and contain the same values. When...

    Started by lisa131067‎, 03-01-2009 02:08 PM
    • Replies: 1
    • Views: 4,367
    03-01-2009, 07:22 PM Go to last post
  57. Learning More... but where?

    Hey y'all, I've been reading quite a few posts for awhile and it's been really neat to see people talking about statistics in such an invested...

    Started by Laelsa‎, 02-27-2009 09:09 PM
    • Replies: 4
    • Views: 2,369
    02-28-2009, 08:35 PM Go to last post
  58. Videopods

    Is anyone aware of any videopods that cover econometrics courses (especially time series and cross sectional analysis?

    Started by 12345678‎, 02-25-2009 12:15 PM
    • Replies: 0
    • Views: 2,185
    02-25-2009, 12:15 PM Go to last post
  59. Logistic regression - different cutpoints for classification and probability?

    I was reading an article on logistic regression tonight, and I noticed the following: "Logistic regression can be used to classify observations as...

    Started by james‎, 02-22-2009 10:03 PM
    • Replies: 2
    • Views: 8,820
    02-24-2009, 05:55 AM Go to last post
  60. studying half-hourly time series

    hello, I have to study a time serie composed of half-hourly data concerning electric load for the period of 6 years : so in my file data i have...

    Started by maryo‎, 02-21-2009 05:23 AM
    • Replies: 5
    • Views: 5,062
    02-24-2009, 03:05 AM Go to last post

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