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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: 18,729
    10-11-2014, 12:02 PM Go to last post
  1. Question How to compute significance here? (And why?)

    Hello, method test_set_size correct accuracy A 898 188 0.209 A+ 898 210 0.234 A++ ...

    Started by marcC‎, 07-28-2009 06:02 AM
    • Replies: 0
    • Views: 3,258
    07-28-2009, 06:02 AM Go to last post
  2. return series

    why does taking a log make a return series continous? ln(r(t)/r(t-1))

    Started by kfcnhl‎, 07-28-2009 08:22 AM
    • Replies: 0
    • Views: 1,838
    07-28-2009, 08:22 AM Go to last post
  3. I have no idea where to start!!

    I need to analyse data for research--- There are 3 outcomes (1,2,3) and two companies (a,b) with 3 departments each (a1,a2,a3 and 1b,2b,3b). I...

    Started by donkey1702‎, 07-30-2009 12:08 AM
    • Replies: 2
    • Views: 2,430
    08-05-2009, 05:36 PM Go to last post
  4. Gumbel Copula

    Does anybody have some code or a paper to show how to simulate n dimensional Gumbel copula ?

    Started by kfcnhl‎, 08-12-2009 02:55 PM
    • Replies: 0
    • Views: 2,401
    08-12-2009, 02:55 PM Go to last post
  5. Research Question

    Hey Everyone hopefully you can help me. My last hope ;-). For a Stat's and Research Exam (on Monday) I need to answer the following questions: Draw...

    Started by jonnymax‎, 08-14-2009 05:28 AM
    • Replies: 0
    • Views: 2,468
    08-14-2009, 05:28 AM Go to last post
  6. 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: 26,356
    08-18-2009, 12:00 AM Go to last post
  7. Fisher information matrix

    Hello everybody, I read here that the Fisher information matrix was the inverse of covariance matrix. How can I show that ? My definition of...

    Started by Pingouinche‎, 08-20-2009 09:01 AM
    • Replies: 0
    • Views: 4,260
    08-20-2009, 09:01 AM Go to last post
  8. Multiple Comparison Correction - Help needed !

    I know the concept that one should have statistical correction if multiple comparison are made between means. Such as the well-known bonferroni...

    Started by doctor‎, 11-02-2008 11:04 AM
    • Replies: 1
    • Views: 4,033
    08-20-2009, 09:42 AM Go to last post
  9. bounds of beta distributions

    I'd like to estimate the lower and upper bounds of a general beta distribution, using 5 and 95 percentiles. I already know how to estimate the mean...

    Started by cem48105‎, 08-20-2009 11:20 AM
    • Replies: 0
    • Views: 2,148
    08-20-2009, 11:20 AM Go to last post
  10. Violation of sphericity...

    If you seem to be violating the assumption of sphericity when undertaking several separate one way repeated-measures ANOVAs and therefore have to...

    Started by nogoodatstats‎, 08-20-2009 03:26 PM
    • Replies: 0
    • Views: 3,834
    08-20-2009, 03:26 PM Go to last post
  11. Question on omega squared...please help!

    I have just obtained the output for a one way repeated measures ANOVA and have read that it is useful to report the size of the effect using omega...

    Started by nogoodatstats‎, 08-20-2009 03:28 PM
    • Replies: 0
    • Views: 5,738
    08-20-2009, 03:28 PM Go to last post
  12. What N to record for regression table?

    Is it the outcome variable (dependent variable) N that I report in a regression table?

    Started by godfather‎, 08-20-2009 07:08 PM
    • Replies: 0
    • Views: 1,912
    08-20-2009, 07:08 PM Go to last post
  13. Dichotomous data...

    Could you tell me if you can use ANOVAs on dichotomous data (specifically "yes" / "no") responses? If not, what other options do you have if your...

    Started by nogoodatstats‎, 08-20-2009 03:25 PM
    • Replies: 1
    • Views: 4,669
    08-21-2009, 01:41 PM Go to last post
  14. Binomial Test that does not assume indepence? (using a repeated measures design)

    Hi, I am looking for a way to analyze data for the following experiment: subjects were presented with two separate acoustic signals at the same...

    Started by ochracea‎, 08-22-2009 10:23 PM
    • Replies: 1
    • Views: 2,679
    08-23-2009, 01:08 PM Go to last post
  15. Do I have a problem with simultaneity here??

    Hi, I am modelling the demand for imported rice for a sample of countries. The price of imports, one of the explanatory variables, is assumed to...

    Started by KristieK‎, 08-29-2009 07:06 AM
    • Replies: 0
    • Views: 3,308
    08-29-2009, 07:06 AM Go to last post
  16. mathematics (is it a differential equation?)

    Hi there, Well I know I'll sound rusty in mathematics but here I go: Let a vector b=. I know the derivatives dQ/db0 and dQ/db1. I am...

    Started by leo nidas‎, 08-28-2009 03:20 PM
    • Replies: 2
    • Views: 3,275
    08-30-2009, 03:33 PM Go to last post
  17. p =.046 significant?

    If I get a probability value of .046 is this considered significant given significance level of .05?

    Started by godfather‎, 08-24-2009 07:14 PM
    • Replies: 5
    • Views: 8,017
    09-02-2009, 10:46 AM Go to last post
  18. Why no international statistical testing?

    I am wondering why it's generally not done to conduct a statistical testing comparing prevalence rate between two different countries even they have...

    Started by Yellowknight888‎, 09-06-2009 04:15 PM
    • Replies: 3
    • Views: 2,395
    09-06-2009, 08:51 PM Go to last post
  19. Trouble with a dichotomous decision study

    Any help appreciated: Have a study with video clips and a Yes / No answer. There is a correct answer. There are ~20 (but this can be changed) clips...

    Started by Chiaroscuro‎, 09-09-2009 11:10 AM
    • Replies: 0
    • Views: 2,758
    09-09-2009, 11:10 AM Go to last post
  20. which test to use?

    Hello everyone, Im a bit stuck as to which test i should be using for my analysis. i have collected the reaction times of 35 participants. There...

    Started by noclue‎, 09-15-2009 06:04 AM
    • Replies: 3
    • Views: 1,900
    09-15-2009, 07:33 AM Go to last post
  21. Meaning for variants of Standard Deviation

    Could someone explain the meaning of the following: 1. More than 3 SD? 2. Less than 3SD but more than 2 SD? 3. Less than 2SD but more than 1 SD?...

    Started by King_Junior‎, 09-18-2009 12:06 AM
    • Replies: 0
    • Views: 4,654
    09-18-2009, 12:06 AM Go to last post
  22. Fisher's z transformation in path analysis

    Hi guys. I am a psychology honours student doing my thesis by producing a path analysis that I ran with two different samples - one with a younger...

    Started by AndrewTheSeer‎, 09-21-2009 09:14 PM
    • Replies: 0
    • Views: 3,396
    09-21-2009, 09:14 PM Go to last post
  23. Tricky(?) sampling problem

    Hello all! I have a survey data set consisting of interview answers of different people. The people have been sampled with simple random sampling....

    Started by kmh‎, 09-26-2009 03:27 AM
    • Replies: 3
    • Views: 3,669
    09-27-2009, 02:33 PM Go to last post
  24. residuals against Y

    Hi all- I'm looking for an argument / example in simple linear regression, if you plot the residuals against Y, there appears to be a relationship...

    Started by B_Miner‎, 09-29-2009 03:06 PM
    • Replies: 7
    • Views: 7,527
    09-30-2009, 11:23 AM Go to last post
  25. Levene's Test - Large F Value

    Hi all, My F Statistic from Levene's Test is very high. The significance is .000. My question is: should an independent T-test even be used...

    Started by PoLyGLoT‎, 10-01-2009 10:16 PM
    • Replies: 1
    • Views: 7,543
    10-02-2009, 11:02 AM Go to last post
  26. multivariate statistics in Izhikevich model

    I have a simple cortical brain simulation model that has an output parameter and various input parameters. The output is the correlation coefficient...

    Started by brad henrie‎, 10-08-2009 08:17 PM
    • Replies: 0
    • Views: 1,899
    10-08-2009, 08:17 PM Go to last post
  27. Question Is this a good idea?

    I have a simple cortical brain simulation model that has an output parameter and various input parameters. The output is the correlation coefficient...

    Started by brad henrie‎, 10-08-2009 08:59 PM
    • Replies: 0
    • Views: 1,928
    10-08-2009, 08:59 PM Go to last post
  28. Correlation versus Regression

    Hi, I am trying to find an impact of some factors on overall satisfaction. Could you please advice me whether correlation or regression is better?...

    Started by Slavek‎, 10-09-2009 06:48 AM
    • Replies: 1
    • Views: 2,452
    10-09-2009, 07:34 AM Go to last post
  29. Estimating initial level after the treatment!

    Hi, Say I wanted to examine the effect of some treatment on a hormone level but I could not measure the pre-treatment level. Example, person runs...

    Started by PeterVincent‎, 10-09-2009 09:29 AM
    • Replies: 3
    • Views: 2,636
    10-09-2009, 11:46 AM Go to last post
  30. Question Process averages as data points in factorial ANOVA

    (Reposting here, original posted in the "Statistical Consulting" forum) Hello all! Electrical engineer here, currently doing research in...

    Started by fcampelo‎, 10-13-2009 12:49 PM
    • Replies: 1
    • Views: 2,221
    10-13-2009, 09:29 PM Go to last post
  31. T test

    Experimental design 3 virus types x 3 exposure concentrations x 2 replicates of 15 fish How can I use the T test to determine if my replicates...

    Started by bendi13‎, 10-12-2009 12:17 PM
    • Replies: 1
    • Views: 1,946
    10-13-2009, 10:12 PM Go to last post
  32. How to compare data from different periods

    I want to analyze the performance of two groups of organizations over time (year to year), using existing information. The groups are similar,...

    Started by bdbailey‎, 10-14-2009 12:43 PM
    • Replies: 0
    • Views: 4,897
    10-14-2009, 12:43 PM Go to last post
  33. I'm Confused, simple question...

    Hello all. I was reading a friend's dissertation and came across something that left me a bit perplexed. In his study, he stated that there...

    Started by Tolstoy‎, 10-15-2009 01:13 PM
    • Replies: 3
    • Views: 2,809
    10-15-2009, 03:56 PM Go to last post
  34. compare unequal-size groups, Likert scale, t-test

    Hello! I have 28 students questionnaires to analyse, these 28 students distributed into 3 groups. in the experiment the 3 groups were put in the...

    Started by Velingrad‎, 09-22-2009 06:58 AM
    • Replies: 1
    • Views: 7,621
    10-19-2009, 01:17 AM Go to last post
  35. Interactions in R and posthocs (lmer model)

    Hello there, here's a question about interactions. Let's just say you have the variables Diagnosis with two levels LI (language impaired) and N...

    Started by at474‎, 10-20-2009 02:18 PM
    • Replies: 1
    • Views: 6,234
    10-20-2009, 10:51 PM Go to last post
  36. logistic regression

    Hi there, In the case of logistic regression with one covariate we have our binary data (vector y),and the covariate vector x, which can be used...

    Started by leo nidas‎, 10-22-2009 10:37 AM
    • Replies: 0
    • Views: 1,996
    10-22-2009, 10:37 AM Go to last post
  37. What is a monte carlo simulation?

    I am doing some research and think I am doing a monte carlo simulation. Could some body please tell me what that is? If someone could also tell me...

    Started by brad henrie‎, 10-22-2009 08:24 PM
    • Replies: 1
    • Views: 3,444
    10-22-2009, 08:53 PM Go to last post
  38. Methodology for building a model based on available time series

    Hi everyone For my Msc research I am trying to estimate a bus demand model based on anuall historical data of demand itself and other explanatory...

    Started by tantan‎, 10-25-2009 04:33 AM
    • Replies: 2
    • Views: 2,161
    10-26-2009, 12:47 PM Go to last post
  39. Question: making a positive case for "no effect"

    I have the results of a basic web-based marketing test. Visitors were randomly sent to one of several pages with a binary outcome of "sale" or "no...

    Started by dwilson‎, 10-21-2009 05:10 PM
    • Replies: 7
    • Views: 3,933
    10-26-2009, 03:23 PM Go to last post
  40. bootstrap and non-stationarity

    Dear all, Is it true to say: If a time series X(t) does not satisfy the strict stationarity condition: P(X(t+1), X(t+2), ... , X(t+T)) =/=...

    Started by resetzero‎, 11-03-2009 02:06 PM
    • Replies: 0
    • Views: 2,550
    11-03-2009, 02:06 PM Go to last post
  41. 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: 17,342
    11-04-2009, 10:14 AM Go to last post
  42. Lightbulb HELP: Put in practice statistical test methodologies

    Hi to everyone. I'm doing a research work about forecast and I found two papers that are very helpful. What I need is to use the methodologies...

    Started by pdsro‎, 11-06-2009 04:58 PM
    • Replies: 0
    • Views: 2,339
    11-06-2009, 04:58 PM Go to last post
  43. Help for Web Log stats on blog site...

    Hello, I have been asked to run an on-going, weekly statistics rankings of topics on a website (blogs). Each blog author lists 'topics', selected...

    Started by gatorpower‎, 11-09-2009 03:27 PM
    • Replies: 1
    • Views: 2,369
    11-10-2009, 03:01 PM Go to last post
  44. Why does a model with an interaction has to include the interaction main effects?

    :wave: Hello fellow stats talkers, If we are only interested in an interaction, I was wondering why a model with a significant interaction also has...

    Started by at474‎, 10-22-2009 11:48 PM
    • Replies: 1
    • Views: 6,233
    11-11-2009, 08:52 AM Go to last post
  45. Help! I'm lacking creativity!

    Hello Everyone! I'm new to this forum so please forgive me if I break any rules. :o I'm taking a Quantitative Research Methods Class this...

    Started by prettyignorant12‎, 11-11-2009 11:25 PM
    • Replies: 0
    • Views: 2,113
    11-11-2009, 11:25 PM Go to last post
  46. Nonparametric regression

    Hi guys, can someone recommend a good source to learn about kernel regression or spline smoothing and perhaps how to compare two plots to each other?

    Started by chickduckduck‎, 11-16-2009 04:50 AM
    • Replies: 2
    • Views: 3,037
    11-17-2009, 01:06 AM Go to last post
  47. About Sampling

    My manager wants me to do a research about advance purchase day vs. fare. however it involves too many categories, and we have billions of tickets...

    Started by humanmaycry‎, 11-19-2009 12:05 AM
    • Replies: 0
    • Views: 2,228
    11-19-2009, 12:05 AM Go to last post
  48. Rolling regressions

    Hi everybody, I was wondering if any of you have any experience with rolling regressions and how to calculate significance when using them. I...

    Started by StatisTicklish‎, 11-20-2009 10:51 AM
    • Replies: 0
    • Views: 4,227
    11-20-2009, 10:51 AM Go to last post
  49. Time Series

    Hi everyone, I've been reading some papers that talk about fractality (hurst exponent) in physiological time series (ekg, eeg, gait, etc.). I was...

    Started by chickduckduck‎, 11-23-2009 03:32 AM
    • Replies: 0
    • Views: 3,210
    11-23-2009, 03:32 AM Go to last post
  50. Question attributes of individuals in discrete choice tasks

    Hello stat talkers, :wave: I'm currently working on a marketing (discrete choice) project concerning brand choice and I stumbled upon some questions...

    Started by alex.wendland‎, 11-16-2009 05:08 AM
    • Replies: 3
    • Views: 3,431
    11-23-2009, 04:23 AM Go to last post
  51. Help with bimodal distribution

    I have a bimodal distribution which I think is made up of 2 normal distributions. How can I tell the 2 distributions apart? In other words I would...

    Started by mousme‎, 11-26-2009 09:03 AM
    • Replies: 0
    • Views: 4,158
    11-26-2009, 09:03 AM Go to last post
  52. Regression on Binned data

    Hi, Can I carry out linear regression reliably with binned data. IE. data on cases falling into a series of ranges over time. I can imagine...

    Started by Cox‎, 11-30-2009 09:38 AM
    • Replies: 0
    • Views: 3,609
    11-30-2009, 09:38 AM Go to last post
  53. Relationship between foods consumed and diseases developed

    What kind of data can we collect to find out the relationship between foods consumed and diseases developed? If a patient says he is a vegetarian...

    Started by Dr.Appalayya‎, 12-01-2009 11:55 PM
    • Replies: 0
    • Views: 2,240
    12-01-2009, 11:55 PM Go to last post
  54. Analysis of 5 point Likert Scale Data

    I am working on analysis of a survey conducted with a 5 point likert agreement scale. I need to explain why 70% agreement (combined agreed and...

    Started by AAA‎, 12-15-2009 12:12 AM
    • Replies: 1
    • Views: 12,372
    12-15-2009, 08:47 PM Go to last post
  55. T-Test: How large is large?

    I'm doing some research, I collected data from two different groups, 80 samples in each group. The data is borderline for normality. I've read on...

    Started by drekhan‎, 12-17-2009 04:24 PM
    • Replies: 1
    • Views: 4,996
    12-18-2009, 03:14 AM Go to last post
  56. Measuring Neural Network Performance

    Hi all, I have a set of matrix where the last column is the RESPONSE VECTOR. I have performed a backprop NN (neural network) in order to...

    Started by akmaltk96‎, 07-07-2008 09:11 PM
    • Replies: 4
    • Views: 5,239
    12-21-2009, 04:14 PM Go to last post
  57. Simple regression

    Hi, I am having a problem and I know a way to solve but don't know how to statistically implement it. I'm trying to summarize the problem in a...

    Started by aimanusarma‎, 12-19-2009 03:44 AM
    • Replies: 4
    • Views: 2,822
    12-25-2009, 09:18 PM Go to last post
  58. Exclamation Reading Research - ANCOVA?

    I have a class (n=30).Using a variety of test I split them into stronger readers - SR (16), weaker readers WR (14) - Quasi-experimental I chose a...

    Started by Grant‎, 12-29-2009 09:05 AM
    • Replies: 0
    • Views: 2,908
    12-29-2009, 09:05 AM Go to last post
  59. Analysis of elections data?

    Dear All, I am currently writing an article on two parliamentary elections taking place in one country during 2009. Data consists of two exit-poll...

    Started by SAJ‎, 12-12-2009 12:45 PM
    2 Pages
    1 2
    • Replies: 29
    • Views: 11,646
    12-31-2009, 06:29 AM Go to last post
  60. By-item random intercepts--to include or not to include?

    We're hoping someone can shed light on this one... :) In experiments involving human subjects, samples are taken from the population. The same can...

    Started by at474‎, 11-10-2009 10:14 AM
    • Replies: 1
    • Views: 2,917
    01-01-2010, 02:46 PM Go to last post

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