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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: 18,723
    10-11-2014, 12:02 PM Go to last post
  1. Marginal Effects

    I know how to run marginal effects on STATA, but was never taught the theory behind them. Working through a textbook that I'm thinking of adopting...

    Started by wjm15‎, 02-28-2010 07:42 PM
    • Replies: 0
    • Views: 4,287
    02-28-2010, 07:42 PM Go to last post
  2. Design Resolution

    As a matter of definition, do all factorial designs have resolutions? Sometimes, designs have factors in a +/- table in which none of the factors is...

    Started by nits555‎, 02-21-2010 12:17 PM
    • Replies: 0
    • Views: 1,822
    02-21-2010, 12:17 PM Go to last post
  3. Advice for analyzing a small sample

    I am currently working on my doctoral thesis in computer science and I have data from an experiment that I want to analyze, but I don't want to run...

    Started by Jefficus‎, 02-15-2010 02:51 PM
    • Replies: 5
    • Views: 5,742
    02-18-2010, 10:39 PM Go to last post
  4. Exogenous and Endogenous Variables

    How can you identify exogenous and endogenous variables from a chart that uses arrows and slings?

    Started by et4u77‎, 02-10-2010 04:04 PM
    • Replies: 1
    • Views: 4,223
    02-12-2010, 03:17 AM Go to last post
  5. probability inequality

    Let X be a random variable such that |X|<=C (bounded). Let f be an even, non decreasing function over the positive values of x. Prove that: /f(C)...

    Started by Zanetti‎, 02-04-2010 04:29 AM
    • Replies: 4
    • Views: 2,610
    02-06-2010, 05:53 PM Go to last post
  6. ANOVA Assumptions for Percentages

    I am trying to analyze land use data (e.g. an given area is made up of 14% residential land, 36% agricultural land, and 50% forested land). So the...

    Started by rbalo‎, 01-29-2010 02:35 PM
    • Replies: 1
    • Views: 9,709
    01-29-2010, 10:30 PM Go to last post
  7. Full factorial design

    I have the followinf situation for a full factorial design. Estimated Effects and Coefficients ________t____ p-value...

    Started by mp83‎, 01-19-2010 08:14 AM
    • Replies: 0
    • Views: 3,349
    01-19-2010, 08:14 AM Go to last post
  8. repeated measurements

    Hi there, I am struggling to understand the way we analyze longitudinal data and I've gone through the net and some books but still have some...

    Started by leo nidas‎, 01-14-2010 10:29 AM
    • Replies: 0
    • Views: 2,863
    01-14-2010, 10:29 AM Go to last post
  9. Garch fitting when some of the data might be inaccurate

    Can anyone guide me to any newbie-ish literature on how to fit garch parameters (for example in Garch 1,1) to data where a small percentage of...

    Started by paulepstein‎, 01-11-2010 10:53 AM
    • Replies: 0
    • Views: 2,648
    01-11-2010, 10:53 AM Go to last post
  10. Stats for whole population data

    Hi all - I'm an employee of a government department who has been asked to answer some question to do with a whole population data set. In short, here...

    Started by JimRobertsonnz‎, 12-07-2009 08:41 PM
    • Replies: 8
    • Views: 6,977
    01-04-2010, 11:13 AM Go to last post
  11. Significance of Correspondence Analysis clusterings

    Dear All, I would like to ask you about Correspondence Analysis. I am wondering if does any strategy exist to test the significance of the...

    Started by gianmarco‎, 12-30-2009 01:28 PM
    • Replies: 4
    • Views: 4,609
    01-03-2010, 02:27 AM Go to last post
  12. demographic stats for choosing where to live

    Given the vast amount of demographic information on sites like: http://quickfacts.census.gov/qfd/index.html Could I could take a subset of...

    Started by kstus‎, 10-02-2009 02:27 PM
    • Replies: 2
    • Views: 2,349
    01-01-2010, 09:35 PM Go to last post
  13. A power analysis question - am I making a big mistake?

    Help! It's a very long time since I have had to tackle Power Analysis but I have recently been handed a couple of problems, one of which I hope...

    Started by Graham‎, 01-01-2010 05:36 PM
    • Replies: 0
    • Views: 2,231
    01-01-2010, 05:36 PM Go to last post
  14. 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: 2,913
    01-01-2010, 02:46 PM Go to last post
  15. 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: 11,645
    12-31-2009, 06:29 AM Go to last post
  16. 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: 2,905
    12-29-2009, 09:05 AM Go to last post
  17. 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: 2,820
    12-25-2009, 09:18 PM Go to last post
  18. 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: 5,238
    12-21-2009, 04:14 PM Go to last post
  19. 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: 4,991
    12-18-2009, 03:14 AM Go to last post
  20. 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&#37; agreement (combined agreed and...

    Started by AAA‎, 12-15-2009 12:12 AM
    • Replies: 1
    • Views: 12,365
    12-15-2009, 08:47 PM Go to last post
  21. 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: 2,238
    12-01-2009, 11:55 PM Go to last post
  22. 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
  23. 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: 4,154
    11-26-2009, 09:03 AM Go to last post
  24. 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: 3,429
    11-23-2009, 04:23 AM Go to last post
  25. 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: 3,208
    11-23-2009, 03:32 AM Go to last post
  26. 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: 4,226
    11-20-2009, 10:51 AM Go to last post
  27. 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: 2,224
    11-19-2009, 12:05 AM Go to last post
  28. 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: 3,035
    11-17-2009, 01:06 AM Go to last post
  29. 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: 2,111
    11-11-2009, 11:25 PM Go to last post
  30. 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: 6,230
    11-11-2009, 08:52 AM Go to last post
  31. 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: 2,366
    11-10-2009, 03:01 PM Go to last post
  32. 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: 2,334
    11-06-2009, 04:58 PM Go to last post
  33. 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: 17,337
    11-04-2009, 10:14 AM Go to last post
  34. 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: 2,545
    11-03-2009, 02:06 PM Go to last post
  35. 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
  36. 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: 2,158
    10-26-2009, 12:47 PM 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: 3,440
    10-22-2009, 08:53 PM Go to last post
  38. 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: 1,994
    10-22-2009, 10:37 AM Go to last post
  39. 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: 6,233
    10-20-2009, 10:51 PM Go to last post
  40. 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: 7,617
    10-19-2009, 01:17 AM Go to last post
  41. 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: 2,803
    10-15-2009, 03:56 PM Go to last post
  42. 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: 4,893
    10-14-2009, 12:43 PM Go to last post
  43. 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: 1,944
    10-13-2009, 10:12 PM Go to last post
  44. 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: 2,218
    10-13-2009, 09:29 PM Go to last post
  45. 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: 2,633
    10-09-2009, 11:46 AM Go to last post
  46. 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: 2,449
    10-09-2009, 07:34 AM Go to last post
  47. 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: 1,927
    10-08-2009, 08:59 PM Go to last post
  48. 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: 1,898
    10-08-2009, 08:17 PM Go to last post
  49. 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
  50. 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: 7,521
    09-30-2009, 11:23 AM Go to last post
  51. 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: 3,665
    09-27-2009, 02:33 PM Go to last post
  52. 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: 3,392
    09-21-2009, 09:14 PM Go to last post
  53. 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: 4,651
    09-18-2009, 12:06 AM Go to last post
  54. 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: 1,899
    09-15-2009, 07:33 AM Go to last post
  55. 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: 2,755
    09-09-2009, 11:10 AM Go to last post
  56. 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: 2,393
    09-06-2009, 08:51 PM Go to last post
  57. 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: 8,012
    09-02-2009, 10:46 AM Go to last post
  58. 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: 3,268
    08-30-2009, 03:33 PM Go to last post
  59. 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: 3,305
    08-29-2009, 07:06 AM Go to last post
  60. 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: 2,676
    08-23-2009, 01:08 PM Go to last post

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