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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: 18,766
    10-11-2014, 12:02 PM Go to last post
  1. 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: 2,326
    01-20-2009, 03:07 AM Go to last post
  2. 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: 3,574
    01-19-2009, 12:19 AM Go to last post
  3. 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: 3,037
    01-17-2009, 11:22 PM Go to last post
  4. 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: 4,066
    01-14-2009, 10:27 PM Go to last post
  5. 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: 4,341
    01-14-2009, 04:15 PM Go to last post
  6. 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: 3,038
    01-14-2009, 12:52 AM 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: 10,062
    01-13-2009, 06:00 PM Go to last post
  8. 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: 5,247
    01-12-2009, 04:15 PM Go to last post
  9. 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: 4,112
    01-10-2009, 07:31 PM Go to last post
  10. 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: 3,114
    12-29-2008, 12:34 AM Go to last post
  11. "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: 2,167
    12-20-2008, 08:16 PM Go to last post
  12. 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: 2,189
    12-18-2008, 02:00 PM Go to last post
  13. 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: 3,384
    12-17-2008, 01:24 AM Go to last post
  14. Composite Scores - Approaches to Missing Data

    I have some data from an assessment form that has 25 items, all on a 5-point scale. What I'm looking at is the sum of these items. For a few...

    Started by Barnzilla‎, 11-20-2008 10:49 AM
    • Replies: 6
    • Views: 6,621
    12-12-2008, 09:43 AM Go to last post
  15. Product pricing question

    Hello all. It's been a long time since I've been on this forum. Glad I was able to find it again. I'm afraid my stats experience is limited to...

    Started by vangogh228‎, 12-08-2008 07:41 AM
    • Replies: 0
    • Views: 2,791
    12-08-2008, 07:41 AM Go to last post
  16. jackknife

    HI all, can some body pls let me know how can i do a jackknife regression. Actually i have done stepwise regression analysis and now i have to apply...

    Started by Mobushir riaz Khan‎, 12-05-2008 07:09 PM
    • Replies: 4
    • Views: 7,948
    12-06-2008, 06:30 PM Go to last post
  17. Manova outlier cutoff

    I have been reading that Manova is very sensitive to outliers, particularly for small groups. One text I read suggests using 3.5 SD as a cutoff for...

    Started by Prairies‎, 12-01-2008 04:17 PM
    • Replies: 5
    • Views: 5,873
    12-04-2008, 12:22 PM Go to last post
  18. Angry Correlation

    I have a list of vehicle models and a number of costs associated with them. For example: Mazda 1000.50 euro Peugeot 2000.23 euro Mazda...

    Started by maltesedog‎, 12-03-2008 03:22 AM
    • Replies: 12
    • Views: 2,863
    12-04-2008, 09:32 AM Go to last post
  19. Help with analysing data

    I have submitted a questionnaire indicating respondants to give their ranking in accordance to their preferred weighting - for example if they gave...

    Started by maltesedog‎, 12-03-2008 03:19 AM
    • Replies: 2
    • Views: 2,456
    12-03-2008, 08:12 AM Go to last post
  20. Centering for interactions in multiple regression ??

    This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

    Started by danielkeeton‎, 11-11-2008 09:37 AM
    • Replies: 5
    • Views: 25,878
    12-01-2008, 06:50 PM Go to last post
  21. Effect of Culture on Scales

    I am considering implementing a study asking respondents to rate several items on 1-10 scale. In America, I know the limitations of the scale. ...

    Started by mpongras‎, 12-01-2008 10:57 AM
    • Replies: 0
    • Views: 2,157
    12-01-2008, 10:57 AM Go to last post
  22. 2 x 4 Factorial Design and contrasts...

    Question... I have a 2 (gender) x 4 (Drug Dose) design Gender - Male - Female Dose - 200 - 400 - 600 - 800

    Started by flanger‎, 11-30-2008 06:40 PM
    • Replies: 2
    • Views: 12,385
    11-30-2008, 11:37 PM Go to last post
  23. Factor Analysis help--Senior Thesis

    I am an undergraduate and working on my senior research project. I am doing a study of the construct validity of a critical thinking test using...

    Started by nswillie‎, 11-20-2008 12:31 PM
    • Replies: 2
    • Views: 3,941
    11-30-2008, 07:50 AM Go to last post
  24. Is this a vaild data transformation method?

    Hello Talkstats people, I am another hopeless case who needs some help with my dissertation statistics. Basically I am not sure if the method...

    Started by anotherhopelesscase‎, 11-26-2008 09:49 AM
    • Replies: 0
    • Views: 4,453
    11-26-2008, 09:49 AM Go to last post
  25. When are random variables random?

    I have an environmental dataset in which a treatment was carried out on a series of plots (situated on the landscape) in duplicate. However the...

    Started by jdmac11‎, 11-26-2008 09:34 AM
    • Replies: 0
    • Views: 3,539
    11-26-2008, 09:34 AM Go to last post
  26. Random Variables and Correlation

    I claim that if x is a normal distributed random variable, and y is a uniformly distributed random variable then x and y cannot have a correlation of...

    Started by rsherry8‎, 11-17-2008 10:14 PM
    • Replies: 11
    • Views: 5,682
    11-20-2008, 03:47 PM Go to last post
  27. website splits - sample sizes

    Id like to do some research into website splits. As visitors arrive to one of our websites (lets call it id=123), the page will randomly deliever...

    Started by hip_au‎, 11-19-2008 08:47 PM
    • Replies: 0
    • Views: 2,109
    11-19-2008, 08:47 PM Go to last post
  28. Survey analysis help: what tests to run?

    I'm doing research investigating why South Korean students are reluctant to speak English in ESL classes. I've developed a survey with nine...

    Started by Noraft‎, 11-18-2008 10:55 PM
    • Replies: 2
    • Views: 5,540
    11-19-2008, 05:28 AM Go to last post
  29. Hypothesis design

    Hi, I have a question regarding hypothesis design. In other words, how to properly assign H0 and H1. For example, if I have statement: Some drug...

    Started by maxim333‎, 11-18-2008 09:00 AM
    • Replies: 3
    • Views: 3,321
    11-19-2008, 12:31 AM Go to last post
  30. What are age effects?

    Any thoughts? I've been asked to find these with some data I've been working with.

    Started by freebird2008‎, 09-21-2008 11:09 AM
    • Replies: 2
    • Views: 2,364
    11-18-2008, 10:33 AM Go to last post
  31. help with sequential type of tests in statistics for hyppothesis testing

    my research topic is sequential type of tests in statistics for hyppothesis testing and i have been told to coollect atleast 20 sequential type...

    Started by rashid‎, 11-18-2008 10:13 AM
    • Replies: 0
    • Views: 2,106
    11-18-2008, 10:13 AM Go to last post
  32. Question on Log-Likelihood. Thanks in advance.

    Question is: There are two lists of data, Y and X. Y is either 1 or 0, and X can be any number. And I have a logistic regression of Logit=B1*X, where...

    Started by luanzi‎, 11-17-2008 01:11 AM
    • Replies: 2
    • Views: 2,529
    11-17-2008, 12:28 PM Go to last post
  33. non-parametric test for repeated measurement

    Hello everyone, I would like to know if some non-parametric test is available to asses wether 2 samples come from the same distribution for repeated...

    Started by alstublieft‎, 11-14-2008 11:16 AM
    • Replies: 4
    • Views: 5,383
    11-17-2008, 04:34 AM Go to last post
  34. Please help?

    Alright, so honestly, I've actually looked up in both my textbooks as well as online tutorials for simplified explanations as to how I can solve the...

    Started by blithevanilla‎, 11-17-2008 12:18 AM
    • Replies: 0
    • Views: 2,271
    11-17-2008, 12:18 AM Go to last post
  35. finding data trends

    I have a dataset that includes four replicates of 7 different concentrations of pesticides applied to a plant. After exposure the number of offshoots...

    Started by studentmile‎, 11-02-2008 01:20 PM
    • Replies: 2
    • Views: 3,623
    11-16-2008, 03:31 AM Go to last post
  36. How to model time-dependent covariate in random effect model?

    I am using a random effect model to examine the effect of several covariates on the outcome variable over time. Some of the covariates are...

    Started by nahh‎, 11-11-2008 11:08 PM
    • Replies: 3
    • Views: 9,835
    11-14-2008, 06:37 PM Go to last post
  37. Pilot Study Numbers

    What is an appropriate number of responses for a pilot study? I'm trying to find something in the literature to support the size. Specifically, since...

    Started by lph2005‎, 11-06-2008 10:56 AM
    • Replies: 4
    • Views: 14,284
    11-11-2008, 01:27 PM Go to last post
  38. Factor Analysis Question

    Hi everyone, I'm a Trainee Clinical Psychologist, not a statistician but we have research to do as part of our training so I'm hoping someone here...

    Started by Officer Pupp‎, 11-04-2008 09:15 AM
    • Replies: 5
    • Views: 3,277
    11-10-2008, 04:27 PM Go to last post
  39. doctoral research

    I would like help with posting and or and analylzing the results of mail surveys on collaboration onto SPSS.

    Started by gradstudent‎, 11-08-2008 10:56 PM
    • Replies: 3
    • Views: 2,584
    11-10-2008, 02:13 AM Go to last post
  40. Question Help with thesis research on social bookmarking

    Hi, I'm writing my thesis right now and I must admit that I underestimated the complexity of the required statistics a bit. My description is quite...

    Started by HFFL‎, 09-01-2008 12:21 PM
    • Replies: 1
    • Views: 2,689
    11-07-2008, 09:54 PM Go to last post
  41. Age-Matching Groups Who Differ on Age

    I have two groups of children, A and B. Group A is the treatment group and has an age range of 5-7 years old. Group B is the control group and has an...

    Started by Barnzilla‎, 10-31-2008 01:40 PM
    • Replies: 4
    • Views: 5,838
    11-06-2008, 02:17 PM Go to last post
  42. Correlation/Regression using Aggregrated Data

    Hi, This is something that I've been wondering about for some time now, but which I've never managed to find a formal reference for....

    Started by EH11‎, 10-30-2008 07:44 AM
    • Replies: 0
    • Views: 3,211
    10-30-2008, 07:44 AM Go to last post
  43. Poll Poll: PCA, FA, CFA, latent variables, and making a scale.

    Hi! I was wondering if anyone had any suggestions for me. I'm working with two datasets. One contains a population of cases (n=25) from 2005, and...

    Started by psnp‎, 10-27-2008 01:58 PM
    • Replies: 1
    • Views: 4,345
    10-28-2008, 12:13 PM Go to last post
  44. Principal components interpretation

    I have principal components based on correlation matrix. Statistica PCA method report outputs not only factor loadings that depend on components'...

    Started by kobylkinks‎, 10-15-2008 12:34 AM
    • Replies: 5
    • Views: 3,933
    10-24-2008, 04:26 AM Go to last post
  45. Standard error (asymptotic standard error) of ŷi of exponential regression (Y = exp(a

    Hello People I was look a formual or description how to calculate standard error of ŷi or usually called asymptotic standard error in non-linear...

    Started by ggalex‎, 10-23-2008 10:49 AM
    • Replies: 0
    • Views: 25,370
    10-23-2008, 10:49 AM Go to last post
  46. Two Stage Least Squares Regression

    I am trying to test a model and have been advised that 2SLS is the appropriate method. I am using SPSS which has the 2SLS option. My problem is that...

    Started by Lisa‎, 10-19-2008 06:35 AM
    • Replies: 0
    • Views: 5,041
    10-19-2008, 06:35 AM Go to last post
  47. Quick Question about Null Effects in ANOVAs

    Hi all, I just have one quick question: I've been analysing a reasonably large experiment recently using a repeated-measures ANOVA (with a...

    Started by kmajal‎, 10-18-2008 01:26 PM
    • Replies: 2
    • Views: 3,329
    10-19-2008, 06:06 AM Go to last post
  48. Expected Value of a Sample Range

    The function for the expected value of a sample range is given on the following page. http://www.jmu.edu/docs/sasdoc/sashtml/qc/chapc/sect9.htm ...

    Started by Papabravo‎, 10-15-2008 12:27 PM
    • Replies: 7
    • Views: 17,522
    10-16-2008, 07:34 PM Go to last post
  49. Stat guidence for a research paper

    I am currently in the process of writing up a small research paper, but I am quite rusty on my stats. I was wondering if anyone could recomend either...

    Started by mbeckert‎, 09-22-2008 03:04 AM
    • Replies: 1
    • Views: 2,920
    10-16-2008, 02:01 AM Go to last post
  50. Multivariate Analysis assistance needed

    I have conducted a survey on online privacy sensitivity. Part of the survey used a previously-proven instrument to generate a Privacy Sensitivity...

    Started by bclifford‎, 10-14-2008 02:19 PM
    • Replies: 4
    • Views: 3,457
    10-14-2008, 07:42 PM Go to last post
  51. Bayesian Logistic Regression

    I have the following logistic regression problem I am trying to solve using bayesian approach. " We consider a logistic regression setting where...

    Started by vioravis‎, 10-13-2008 03:09 PM
    • Replies: 0
    • Views: 3,155
    10-13-2008, 03:09 PM Go to last post
  52. concordance of two sets of data

    here is my problem: for a set of genes i have an expected(predicted) phenotype and an observed phenotype. i need prove that the level of...

    Started by anjan_purkayastha‎, 10-13-2008 12:29 PM
    • Replies: 0
    • Views: 3,386
    10-13-2008, 12:29 PM Go to last post
  53. A Simple Meta-Analysis query

    Hi All, I am working on my first meta-analysis project and this may sound silly, but I am having difficulty deciding which studies to include. ...

    Started by claireH‎, 10-10-2008 04:50 AM
    • Replies: 0
    • Views: 2,454
    10-10-2008, 04:50 AM Go to last post
  54. Interval Level

    Could anybody help with game theory in accordance to penetrating a market? Thank you for your answers!

    Started by equaglia‎, 10-08-2008 01:40 PM
    • Replies: 1
    • Views: 2,892
    10-08-2008, 02:11 PM Go to last post
  55. A nice easy one about Repeated Measures ANOVA

    Hello! A basic question from a not-very-statistically-savvy person: I have data from 2 groups of patients who underwent knee replacement...

    Started by okennedy‎, 10-06-2008 08:36 AM
    • Replies: 5
    • Views: 6,505
    10-07-2008, 01:00 PM Go to last post
  56. Exclamation Are scores significantly different to a neutral response? Please help...

    Hello I am working with a likert scale with response ranges from 1-5. A score of '3' indicates a neutral response. I want to calculate whether,...

    Started by gemma7‎, 10-05-2008 07:28 AM
    • Replies: 5
    • Views: 6,507
    10-06-2008, 07:40 PM Go to last post
  57. which statistics to apply?

    Purpose of my study is to understand better how the experimental lines I am using compare to the positive and negative controls under untreated or...

    Started by stats123‎, 09-28-2008 10:46 PM
    • Replies: 1
    • Views: 2,499
    10-06-2008, 09:15 AM Go to last post
  58. help choosing LDA situation to implement

    Hey all, I am a comp sci grad student interested in pattern recognition, and have been told that LDA is a good place to start before moving into...

    Started by dkwestbr‎, 10-06-2008 01:00 AM
    • Replies: 0
    • Views: 2,454
    10-06-2008, 01:00 AM Go to last post
  59. Urgent-Statistical Test comparing means of unknown distributions

    Is there a non-parametric test with which one can reject the null hypothesis of an equal mean (μ1 = μ2) between two sample distributions, over an...

    Started by moudatsos‎, 09-29-2008 01:31 PM
    • Replies: 1
    • Views: 5,069
    10-04-2008, 02:40 PM Go to last post
  60. Looking for a better answer, if there is one (Puzzle)

    I've worked out a solution to a problem, but I was wondering if there might be a better way to do this. I'm using a computer to calculate these...

    Started by Creamsteak‎, 10-03-2008 02:42 PM
    • Replies: 1
    • Views: 2,624
    10-04-2008, 11:24 AM Go to last post

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