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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: 18,694
    10-11-2014, 12:02 PM Go to last post
  1. Instrumental Variable?

    So i have a bunch of variables: religious beliefs (how religious you are) and religious participation (how often you go to church), and demographic...

    Started by svalik‎, 12-09-2008 12:12 PM
    • Replies: 1
    • Views: 3,370
    12-17-2008, 01:24 AM Go to last post
  2. Unhappy Two groups & two

    Hi Wondering if anyone can help with this one. Well, several really. I am planning to conduct a study examining how easy it is to use two...

    Started by SML‎, 12-18-2008 02:00 PM
    • Replies: 0
    • Views: 2,176
    12-18-2008, 02:00 PM Go to last post
  3. "Maximally uncorrelated" representation for a covariance matrix

    Hi, I have a question about the covariance matrix from a real-life study in particle physics. I am working on a non-linear fit of a...

    Started by pmn1‎, 12-20-2008 08:16 PM
    • Replies: 0
    • Views: 2,148
    12-20-2008, 08:16 PM Go to last post
  4. Symmetry Model Categorical Data Analysis

    Does ANYONE understand the symmetry model for categorical data analysis by Agresti? I have a Likert scale that places students into 4 categories. I...

    Started by KFTaiChi‎, 12-20-2008 07:15 PM
    • Replies: 1
    • Views: 3,076
    12-29-2008, 12:34 AM Go to last post
  5. Power Analysis for SURVEY data

    I am doing secondary data analysis on survey data that has a clustered, complex random design. I am using STATA 9.0. For the Power analysis do I use...

    Started by kawillit‎, 01-10-2009 07:31 PM
    • Replies: 0
    • Views: 4,090
    01-10-2009, 07:31 PM Go to last post
  6. Multivariate Statistics: Which is appropriate PCA, DFA, MANCOVA?

    Hello there, I am trying to determine which multivariate statistical techniques are most appropriate to address my biological questions and type...

    Started by lophodont‎, 01-12-2009 04:15 PM
    • Replies: 0
    • Views: 5,221
    01-12-2009, 04:15 PM Go to last post
  7. Tricky running mean and standard deviation problem

    Hi, I have a pretty tricky problem that I can't seem to solve. The basic problem can be expressed as follows: - I have a stream of data (in my...

    Started by james_2002uk‎, 01-08-2009 06:14 PM
    • Replies: 8
    • Views: 10,037
    01-13-2009, 06:00 PM Go to last post
  8. Tests for Change in Mean Dependent data

    Hello, I am doing research on change point analysis. I am working on the attached paper and I'm trying to see where the number in Table 1 are...

    Started by SVM‎, 01-14-2009 12:52 AM
    • Replies: 0
    • Views: 3,031
    01-14-2009, 12:52 AM Go to last post
  9. Cool Alternative to two-sample t-test when proportions are SMALL (<0.001)

    Hi, I'm looking for an alternative to the two-sample (independent) t-test for equality of proportions. The two-sample t-statistic only holds...

    Started by swnicholson‎, 01-14-2009 04:15 PM
    • Replies: 0
    • Views: 4,315
    01-14-2009, 04:15 PM Go to last post
  10. Comparing Improvement Between Groups - Best Approach?

    Perhaps this is an easy issue, but I wanted to throw it out anyway. I'm working on a dataset where there are two groups, both having pre- and...

    Started by Barnzilla‎, 11-28-2008 09:58 AM
    • Replies: 3
    • Views: 4,036
    01-14-2009, 10:27 PM Go to last post
  11. Post How to do this power study?

    Suppose I have a function f(x) = { 0 if 0 =< x < 0.5 { Beta=0.5 if 0.5 =< x =< 1 y = f(x) +...

    Started by SVM‎, 01-17-2009 11:22 PM
    • Replies: 0
    • Views: 3,008
    01-17-2009, 11:22 PM Go to last post
  12. Randomization in an experiment

    Hi, everyone. I know randomization is basically to help guarantee that the experiment at hand doesn't systematically favor any condition over...

    Started by cowmoose‎, 01-19-2009 12:19 AM
    • Replies: 0
    • Views: 3,551
    01-19-2009, 12:19 AM Go to last post
  13. Question Repeated measurements are negatively correlated

    I have a set of data on 9 subjects. A measurement is taken every week for 10 consecutive weeks. Say I would like to compare the measurements taken on...

    Started by anggraini_13‎, 01-20-2009 03:07 AM
    • Replies: 0
    • Views: 2,316
    01-20-2009, 03:07 AM Go to last post
  14. Where do I start?

    Hi! I'm feeling overwhelmed here and don't know where to start. It is the second message regarding my project and any additional help would be...

    Started by Merlion‎, 01-20-2009 01:08 PM
    • Replies: 1
    • Views: 3,174
    01-21-2009, 09:40 AM Go to last post
  15. Statistical Research Question

    Here is what I am looking at: I want to know how 3 factors (we'll call them A1, A2, A3) correlate with Store Sales per Store (532 stores). In...

    Started by vanna‎, 01-21-2009 12:38 PM
    • Replies: 3
    • Views: 3,439
    01-22-2009, 02:09 AM Go to last post
  16. Longitudinal Regression Issue

    Hi there, I am conducting a hierarchical longitudinal regression over an 18 month time span. I have main effects, quadratic terms and interactions...

    Started by mandy_a41‎, 01-22-2009 12:35 AM
    • Replies: 1
    • Views: 2,859
    01-22-2009, 02:16 AM Go to last post
  17. Help on Factor analysis and Extension

    Hello frnds , Recently we had done a project on Factor analysis approach to understand the indian consumer behavior Our survey questioner...

    Started by amjath‎, 01-21-2009 05:08 PM
    • Replies: 8
    • Views: 5,217
    01-26-2009, 12:28 PM Go to last post
  18. 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: 18,335
    01-28-2009, 08:31 AM Go to last post
  19. Hierarchical Cluster Analysis: which method to use?

    Hi all, I have a data set consisting of 32 records (linguistic constructions) and count data on how often each construction is used for each of 5...

    Started by nsmit1‎, 01-28-2009 08:00 AM
    • Replies: 2
    • Views: 5,153
    01-29-2009, 04:49 AM Go to last post
  20. reporting statistical results

    I am wondering if this is the correct way of reporting significnat differences between correlations: "Conversely, males’ self-serving cognitive...

    Started by godfather‎, 02-06-2009 03:39 AM
    • Replies: 2
    • Views: 4,061
    02-09-2009, 10:12 AM Go to last post
  21. testing

    I am new to thread but wondering how I would go about testing inferentially a hypothesis for a research paper. It would be regarding productivity as...

    Started by brickwall‎, 02-09-2009 11:06 PM
    • Replies: 0
    • Views: 2,389
    02-09-2009, 11:06 PM Go to last post
  22. variables in linear mixed model

    Hello, I'm performing a longitudinal study, that compares computer use duration measured by 2 different methods: by questionnaire and computer...

    Started by richterr‎, 02-11-2009 10:27 AM
    • Replies: 0
    • Views: 2,466
    02-11-2009, 10:27 AM Go to last post
  23. Complementary log log

    Hi I have a model with a binomial error distribution. Instead of the logit link I use the complementary log log. What is the interpretation of...

    Started by hen666‎, 02-12-2009 01:24 PM
    • Replies: 1
    • Views: 4,745
    02-12-2009, 04:09 PM Go to last post
  24. is it possible to have multiple mediators that all fully mediate

    I have a situation where I found my two mediators are both full mediators Does it make sense? I would think there should be only one full mediators...

    Started by angelaabd‎, 02-14-2009 02:27 AM
    • Replies: 1
    • Views: 2,775
    02-14-2009, 03:15 AM Go to last post
  25. Desperate urgent help

    Hi everybody, First, let me say how much I appreciate your help here. Its a life saver. I have a presentation tomorrow on my research and I am...

    Started by ruzbayhhi‎, 02-17-2009 07:00 AM
    • Replies: 3
    • Views: 2,706
    02-20-2009, 02:07 AM Go to last post
  26. Testing change between 2 samples at 2 periods of time

    Hi Id wonder if anyone could help me. Im having one of those brain freeze moments when you think you may know the answer but really would...

    Started by lost in stats‎, 02-20-2009 02:54 AM
    • Replies: 0
    • Views: 4,275
    02-20-2009, 02:54 AM Go to last post
  27. Granger Causality test help!

    I have run a Granger causality test on two time series but im not sure based on the output whether or not to reject the null hypothesis. Below is the...

    Started by ross781‎, 02-21-2009 01:38 PM
    • Replies: 0
    • Views: 5,250
    02-21-2009, 01:38 PM Go to last post
  28. Comparing deaths with reportings

    Hi. For my dissertation I am looking at how "Superbugs" are represented in the Media, and how the media's portrayal of them has caused some...

    Started by dellmarie88‎, 02-21-2009 02:10 PM
    • Replies: 0
    • Views: 1,965
    02-21-2009, 02:10 PM Go to last post
  29. Smile Would someone please please help with ANCOVA?

    I am an elementary school teacher and know next to nothing about statistics. It's been over 15 years since I was in a statistics class. I am working...

    Started by celticangel‎, 02-21-2009 04:03 PM
    • Replies: 1
    • Views: 2,784
    02-21-2009, 05:37 PM Go to last post
  30. 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: 4,889
    02-24-2009, 03:05 AM Go to last post
  31. 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: 8,669
    02-24-2009, 05:55 AM Go to last post
  32. 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: 2,106
    02-25-2009, 12:15 PM Go to last post
  33. 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: 2,307
    02-28-2009, 08:35 PM Go to last post
  34. 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: 4,213
    03-01-2009, 07:22 PM Go to last post
  35. 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: 2,904
    03-02-2009, 12:52 AM Go to last post
  36. 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: 6,860
    03-02-2009, 10:30 AM Go to last post
  37. 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: 4,018
    03-04-2009, 12:39 AM Go to last post
  38. 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: 9,600
    03-06-2009, 02:57 PM Go to last post
  39. 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: 2,435
    03-06-2009, 04:22 PM Go to last post
  40. 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: 2,565
    03-07-2009, 10:56 AM Go to last post
  41. 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: 1,812
    03-07-2009, 08:35 PM Go to last post
  42. 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: 2,411
    03-08-2009, 03:38 AM Go to last post
  43. 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: 9,641
    03-09-2009, 08:41 AM Go to last post
  44. 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: 2,223
    03-09-2009, 02:33 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: 5,681
    03-10-2009, 04:57 PM Go to last post
  46. 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: 2,752
    03-10-2009, 05:55 PM Go to last post
  47. 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: 3,760
    03-11-2009, 05:40 PM Go to last post
  48. 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: 2,181
    03-12-2009, 02:02 AM Go to last post
  49. 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: 4,703
    03-15-2009, 10:11 AM Go to last post
  50. 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: 5,905
    03-16-2009, 05:52 AM Go to last post
  51. 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: 3,725
    03-16-2009, 11:07 AM Go to last post
  52. 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: 2,296
    03-16-2009, 02:46 PM Go to last post
  53. 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: 5,575
    03-19-2009, 12:07 AM Go to last post
  54. 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: 3,128
    03-20-2009, 04:19 PM Go to last post
  55. 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: 7,384
    03-22-2009, 08:55 AM Go to last post
  56. About the distribution of confidence interval for Weibull

    Does anyone have an idea about the distribution of the 95&#37; confidence intervals for a population with a Weibull distribution? Thanks in advance!

    Started by ppmovie‎, 03-23-2009 06:18 PM
    • Replies: 0
    • Views: 3,497
    03-23-2009, 06:18 PM Go to last post
  57. 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: 3,761
    03-25-2009, 04:10 AM Go to last post
  58. 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: 1,624
    03-25-2009, 11:08 PM Go to last post
  59. 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: 10,275
    03-25-2009, 11:55 PM Go to last post
  60. 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: 5,521
    03-26-2009, 08:12 AM Go to last post

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