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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: 18,731
    10-11-2014, 12:02 PM Go to last post
  1. generate data for logistic regression simple question

    Hi there, If I want to see how good can I estimate the coefs in the simple linear model y=b0+b1*x+e when X follows exponential with mean 3 (or...

    Started by leo nidas‎, 08-28-2008 12:55 PM
    • Replies: 1
    • Views: 4,413
    08-28-2008, 03:19 PM Go to last post
  2. From OLS to Box Cox to ?

    Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

    Started by andony‎, 08-29-2008 01:25 PM
    • Replies: 4
    • Views: 5,971
    08-31-2008, 02:58 PM Go to last post
  3. Question Anova

    Develop two-null hypothesis tests to ascertain if there are any statistical variances in the averages of bus route times and any statistical variance...

    Started by tyrankj‎, 09-02-2008 12:20 AM
    • Replies: 2
    • Views: 4,785
    09-02-2008, 03:38 AM Go to last post
  4. Question Q re Gauss-Newton Method convergence in Nonlinear Regression

    I am using a Minitab implementation of the Gauss-Newton Method to approximate a nonlinear regression of a model with 6 parameters (2 are covariates)....

    Started by jalanthomas‎, 09-07-2008 10:25 AM
    • Replies: 1
    • Views: 2,422
    09-07-2008, 08:18 PM Go to last post
  5. Meta-Analysis

    Hello, I am in the process of coding a number of study results for the purpose of conducting a meta-analysis. At present i am having an issue with...

    Started by Jogilvie‎, 09-03-2008 06:33 AM
    • Replies: 1
    • Views: 3,553
    09-09-2008, 12:24 AM Go to last post
  6. Question pre-test post-test difficulty

    Hi everyone, I'm new to the forum, but I'm definitely glad it's here. I have a difficult research design problem / stats problem that I was...

    Started by rclukey‎, 09-09-2008 05:09 PM
    • Replies: 1
    • Views: 5,908
    09-09-2008, 10:02 PM Go to last post
  7. Help in Genetic Analysis

    Hy, what is the better test (or software) to compare the genotype (or allele) frequency of several gene mutations, at the same time in two...

    Started by mnasi‎, 09-10-2008 08:30 AM
    • Replies: 0
    • Views: 2,445
    09-10-2008, 08:30 AM Go to last post
  8. Covariate Estimation & Unbiased Estimation

    I work with a group that utilizes the Mahalanobis Distance to detect the health of a system, mostly electronics. Within this research, we are looking...

    Started by 3waytie4last‎, 09-10-2008 12:41 PM
    • Replies: 0
    • Views: 4,000
    09-10-2008, 12:41 PM Go to last post
  9. Mahalanobis Distance

    I am doing research concerning the degradation of a particular system... In this case, a cooling fan for a computer. I am measuring three...

    Started by 3waytie4last‎, 09-11-2008 09:42 AM
    • Replies: 0
    • Views: 4,497
    09-11-2008, 09:42 AM Go to last post
  10. Deck of cards: Odds of being dealt 3 of a suit?

    I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

    Started by domino‎, 09-15-2008 03:31 AM
    • Replies: 2
    • Views: 8,542
    09-15-2008, 09:46 AM Go to last post
  11. Cut-off Points in Linear Discriminant Analysis

    Everyone can discuss about the cut-off points in linear discriminant analysis. I know how to calculate it when there are 2 groups. But, more than 2...

    Started by shike‎, 09-15-2008 11:55 PM
    • Replies: 2
    • Views: 5,778
    09-16-2008, 02:22 AM Go to last post
  12. Probability Theory Exam

    Studying for a probability exam and here are two practice problems I can't seem to solve 1. Let P be the uniform distribution on a finite set...

    Started by statboy‎, 09-17-2008 10:04 AM
    • Replies: 1
    • Views: 4,312
    09-17-2008, 01:21 PM Go to last post
  13. simple regression question (I think)

    Hi there, Suppose I have the simple libear regression model: Y=a0+a1*X+ε where ε~N(0,σ^2) Suppose that via least squares I estimate a0...

    Started by leo nidas‎, 09-24-2008 07:19 AM
    • Replies: 5
    • Views: 3,829
    09-24-2008, 02:35 PM Go to last post
  14. 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: 2,618
    10-04-2008, 11:24 AM Go to last post
  15. 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: 5,066
    10-04-2008, 02:40 PM Go to last post
  16. 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: 2,445
    10-06-2008, 01:00 AM Go to last post
  17. 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: 2,493
    10-06-2008, 09:15 AM Go to last post
  18. 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: 6,485
    10-06-2008, 07:40 PM Go to last post
  19. 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: 6,492
    10-07-2008, 01:00 PM Go to last post
  20. 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: 2,883
    10-08-2008, 02:11 PM Go to last post
  21. 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: 2,443
    10-10-2008, 04:50 AM Go to last post
  22. 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: 3,376
    10-13-2008, 12:29 PM Go to last post
  23. 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: 3,149
    10-13-2008, 03:09 PM Go to last post
  24. 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: 3,449
    10-14-2008, 07:42 PM Go to last post
  25. 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: 2,914
    10-16-2008, 02:01 AM Go to last post
  26. 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: 17,497
    10-16-2008, 07:34 PM Go to last post
  27. 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: 3,313
    10-19-2008, 06:06 AM Go to last post
  28. 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: 5,029
    10-19-2008, 06:35 AM Go to last post
  29. 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: 25,362
    10-23-2008, 10:49 AM Go to last post
  30. 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: 3,929
    10-24-2008, 04:26 AM Go to last post
  31. 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: 4,339
    10-28-2008, 12:13 PM Go to last post
  32. 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: 3,199
    10-30-2008, 07:44 AM Go to last post
  33. 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: 5,828
    11-06-2008, 02:17 PM Go to last post
  34. 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: 2,686
    11-07-2008, 09:54 PM Go to last post
  35. 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: 2,582
    11-10-2008, 02:13 AM Go to last post
  36. 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: 3,269
    11-10-2008, 04:27 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: 14,266
    11-11-2008, 01:27 PM Go to last post
  38. 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: 9,818
    11-14-2008, 06:37 PM Go to last post
  39. 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: 3,609
    11-16-2008, 03:31 AM Go to last post
  40. 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: 2,261
    11-17-2008, 12:18 AM Go to last post
  41. 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: 5,372
    11-17-2008, 04:34 AM Go to last post
  42. 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: 2,517
    11-17-2008, 12:28 PM Go to last post
  43. 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: 2,097
    11-18-2008, 10:13 AM Go to last post
  44. 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: 2,360
    11-18-2008, 10:33 AM Go to last post
  45. 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: 3,314
    11-19-2008, 12:31 AM Go to last post
  46. 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: 5,528
    11-19-2008, 05:28 AM Go to last post
  47. 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: 2,100
    11-19-2008, 08:47 PM Go to last post
  48. 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: 5,671
    11-20-2008, 03:47 PM Go to last post
  49. 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: 3,529
    11-26-2008, 09:34 AM Go to last post
  50. 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: 4,445
    11-26-2008, 09:49 AM Go to last post
  51. 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: 3,929
    11-30-2008, 07:50 AM Go to last post
  52. 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: 12,347
    11-30-2008, 11:37 PM Go to last post
  53. 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: 2,148
    12-01-2008, 10:57 AM Go to last post
  54. 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: 25,859
    12-01-2008, 06:50 PM Go to last post
  55. 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: 2,449
    12-03-2008, 08:12 AM Go to last post
  56. 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: 2,858
    12-04-2008, 09:32 AM Go to last post
  57. 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: 5,854
    12-04-2008, 12:22 PM Go to last post
  58. 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: 7,934
    12-06-2008, 06:30 PM Go to last post
  59. 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: 2,784
    12-08-2008, 07:41 AM Go to last post
  60. 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: 6,609
    12-12-2008, 09:43 AM Go to last post

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