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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: 18,620
    10-11-2014, 12:02 PM Go to last post
  1. Markov Processes

    How to proof that in every markov process time between 2 arrivals is exponential ? best regards

    Started by endri81‎, 08-08-2011 12:49 AM
    • Replies: 0
    • Views: 1,607
    08-08-2011, 12:49 AM Go to last post
  2. paired samples-equality of variance and 95% CI around difference

    Hi, Can a few of you please review the approach I plan to take for obvious errors? I have 50 subjects and each have a measure taken on the same...

    Started by seth‎, 08-02-2011 11:53 PM
    2 Pages
    1 2
    • Replies: 24
    • Views: 8,689
    08-06-2011, 10:29 PM Go to last post
  3. Which test/model to use?

    Hello, I have a question regarding what methods/tests/models I can use to analyze my data. The data consists of different samples of teeth from...

    Started by mid06004‎, 08-06-2011 09:07 PM
    • Replies: 1
    • Views: 2,210
    08-06-2011, 09:20 PM Go to last post
  4. data simulation help

    Hi all, How do I generate count data from a gamma distribution, preferably using SAS? For example, I assume that frequency of persons born in...

    Started by manoa‎, 08-05-2011 08:48 PM
    • Replies: 2
    • Views: 1,926
    08-05-2011, 09:45 PM Go to last post
  5. power analysis for parameter estimation of a gamma distribution?

    How do I calculate the needed sample size to determine if the parameter estimates are accurate enough for a gamma distribution? Thanks.

    Started by manoa‎, 08-03-2011 09:23 PM
    • Replies: 10
    • Views: 3,617
    08-04-2011, 05:30 PM Go to last post
  6. Lightbulb Help with attribution/causality

    Hello everyone! I am new to this forum, but excited to become more involved :tup: I am currently a mathematics/statistics student and I am looking...

    Started by JesusWalks‎, 08-03-2011 12:49 PM
    attribution, causality, ecological statistics, model, statistics
    • Replies: 1
    • Views: 2,749
    08-04-2011, 05:23 PM Go to last post
  7. how to determine sample size for on-farm strip trials

    We have been doing on-farm strip trials (with two treatments: normal rate and normal+50 rate of fertilizer) for 3 years. Because we have farmers...

    Started by leiniao‎, 08-03-2011 01:22 PM
    • Replies: 1
    • Views: 1,889
    08-04-2011, 05:21 PM Go to last post
  8. Using statistical analysis to show hybrid performance gains

    Are there any statistical analysis techniques that i can use for the following scenario? As part of my report, i was asked to study the fuel...

    Started by amahesh2012‎, 07-28-2011 07:16 AM
    • Replies: 1
    • Views: 1,599
    08-04-2011, 02:38 PM Go to last post
  9. Series of T-Tests

    Hi All, I have a theoretical question... I have a categorical variable with two levels, and around 200 continuous variables. I wanted to check...

    Started by NN_STAT‎, 08-04-2011 01:29 AM
    • Replies: 4
    • Views: 3,302
    08-04-2011, 02:28 PM Go to last post
  10. Chernoff Faces Taken Seriously?

    Often I come across web articles or books mention Chernoff faces as a way to efficiently express multivariate data with up to 10 different numeric...

    Started by trinker‎, 08-04-2011 11:28 AM
    • Replies: 1
    • Views: 2,791
    08-04-2011, 11:37 AM Go to last post
  11. data not normally distributed

    Hi, I had originally intended to use a mixed repeated measures anova to test my data, however unfortunately it is not normally distributed and so...

    Started by bubu‎, 08-04-2011 10:06 AM
    • Replies: 1
    • Views: 2,099
    08-04-2011, 10:19 AM Go to last post
  12. how to determine the sample size needed for logit model

    how to determine the sample size needed for logit model? we are currently working on a thesis.

    Started by Anthny Garc‎, 08-02-2011 01:46 AM
    • Replies: 1
    • Views: 3,445
    08-03-2011, 12:12 AM Go to last post
  13. Paired t test or repeated anova

    I have a two groups design (treatment vs control) and pre and post test. I've looked at a paired t-test to see if there was a difference, and...

    Started by proprioceptivo‎, 08-02-2011 07:54 PM
    psychology
    • Replies: 2
    • Views: 5,653
    08-02-2011, 08:09 PM Go to last post
  14. Help needed with choice of appropriate method for repeated measures data

    Hello! I'm new on this forum and I'm desperately searching for advice on analyzing my data. I'm currently working on my master's thesis and I'm...

    Started by Elvin Roest‎, 08-02-2011 04:35 AM
    • Replies: 0
    • Views: 1,486
    08-02-2011, 04:35 AM Go to last post
  15. Appropriate Method for Researching the Motives behind a Decision

    Hello, I am interested in studying the motives behind a particular decision. This would be a onfirmatory study. According to the theory I will...

    Started by Sta‎, 07-24-2011 12:33 AM
    • Replies: 2
    • Views: 2,213
    07-30-2011, 03:22 AM Go to last post
  16. Correct method for determining group membership

    Hi, I am doing some research into what determines whether or not people gain an educational qualification in later life. My thought was to run...

    Started by lmsava‎, 07-20-2011 10:42 AM
    • Replies: 8
    • Views: 5,287
    07-29-2011, 07:03 AM Go to last post
  17. P Value...should I trust it ?

    Hello, I am trying to detect significant differences in response of some device, among two groups: healthy and sick people. I ran a t-test,...

    Started by NN_STAT‎, 07-28-2011 02:00 AM
    • Replies: 7
    • Views: 3,472
    07-28-2011, 10:47 AM Go to last post
  18. Kappa Help!!!

    Please could you help - I'd like to do a kappa stat on following data: 8 rates, 6 papers - each judging whether the paper contains a certain...

    Started by LizR‎, 07-14-2011 07:49 AM
    • Replies: 4
    • Views: 1,935
    07-28-2011, 08:26 AM Go to last post
  19. Help needed urgently - dichotomous question

    Hi everyone, I have the following answers to the survey question "are you a new client" (Yes/No). My sample is 1200 clients with 520 respondents....

    Started by hsaharmo‎, 07-27-2011 07:32 AM
    • Replies: 5
    • Views: 3,169
    07-28-2011, 07:54 AM Go to last post
  20. Sampling error & meaning of level of significance (AKA alpha)

    My understanding of alpha the level of significance is that in a large number of hypothesis tests the null will be rejected percentage alpha times...

    Started by PeterVincent‎, 07-26-2011 05:59 AM
    • Replies: 2
    • Views: 3,329
    07-28-2011, 05:10 AM Go to last post
  21. Group theoretic approach to ANOVA

    Hello, I have been following the works of Diaconis, Viana and van de Ven and have a query about the approach taken in van de Ven's dissertation...

    Started by Ravi Kulkarni‎, 07-27-2011 03:10 AM
    • Replies: 3
    • Views: 1,697
    07-28-2011, 03:05 AM Go to last post
  22. Smile Appropriate method for research model

    Hi guys! Please i need your advice! I have developed a model about some factors that influence the desire of members to share information is...

    Started by icsd04‎, 07-22-2011 09:33 AM
    2 Pages
    1 2
    • Replies: 16
    • Views: 5,970
    07-26-2011, 10:11 PM Go to last post
  23. multiple comparison problem when testing an optimization technique via simulation

    Hi, I have a case where I have conducted 50 simulation tests. For each test, I assigned values to parameters at random (18 parameters each ...

    Started by seth‎, 07-26-2011 10:01 PM
    • Replies: 0
    • Views: 1,372
    07-26-2011, 10:01 PM Go to last post
  24. Public Transport Model

    Hi. I am working on statistical model about people waiting time for city bus. Actually I cannot count all people who go in and out from bus in...

    Started by endri81‎, 07-26-2011 11:46 AM
    • Replies: 0
    • Views: 1,766
    07-26-2011, 11:46 AM Go to last post
  25. Cool comparing percentage when without knowing n? what test?

    I'm trying to do a meta analysis of some poll results and though I know the sample size in general, if I'm comparing the reported results and they...

    Started by rokkid‎, 07-25-2011 10:51 AM
    comparing percentages, missing data, proportions
    • Replies: 2
    • Views: 1,698
    07-25-2011, 06:15 PM Go to last post
  26. NIG, stretched exponential and Levy stable estimation

    Hello to all, I'm currently studying the distribution of returns of stock market indexes, and I would like to do some hypothesis testing on their...

    Started by the_blue_note‎, 07-25-2011 01:20 PM
    econophysics, levy stable distributions, normal inverse gaussian, parameter estimation
    • Replies: 0
    • Views: 1,597
    07-25-2011, 01:20 PM Go to last post
  27. Question 'Mean location/ spot'

    I have a design that need to have mean of different spots, in simple term it would be like this. P1 shoot 6 and P2 shoot 8 out of 16 neighboring...

    Started by funny4u22001‎, 07-25-2011 12:45 AM
    • Replies: 0
    • Views: 1,656
    07-25-2011, 12:45 AM Go to last post
  28. Two sample tests

    Hello, I am looking for differences in continuous variables between two groups: Healthy people and ill people. I have a sample of around 20 ill...

    Started by WeeG‎, 07-23-2011 07:37 AM
    • Replies: 3
    • Views: 1,841
    07-24-2011, 02:48 PM Go to last post
  29. Analysis Workflow: Best practices

    Hello all, I hope this finds everyone doing well. I have a couple of questions about workflow for analyses. Hopefully, this will be of broad...

    Started by jpkelley‎, 07-23-2011 04:03 PM
    workflow
    • Replies: 4
    • Views: 2,334
    07-23-2011, 11:55 PM Go to last post
  30. Statistical Tests Help

    Hi guys, I am completely at odds as to what statistical tests I can use to analyze my data, and I was hoping that you guys could help me. What I...

    Started by mid06004‎, 07-22-2011 11:25 AM
    • Replies: 5
    • Views: 2,638
    07-22-2011, 04:14 PM Go to last post
  31. Testing Standard deviations for repeated measures design

    Hi, I need to do a within subject test of standard deviations. I have 14 people and 4 groups of standard deviations. We want to see if there is any...

    Started by katikarp‎, 07-21-2011 12:19 PM
    • Replies: 5
    • Views: 3,594
    07-21-2011, 02:16 PM Go to last post
  32. What kind of statistical analysis to use?!?!

    I am a grad student working on a research project and I'm not sure what kind of tests to run in SPSS. I have a set of test scores and a set of 4...

    Started by cgrif21‎, 07-20-2011 07:00 PM
    • Replies: 2
    • Views: 1,779
    07-21-2011, 12:54 PM Go to last post
  33. Smile Help!! Mini stat survey!

    Hi all mathies, I have a favor to ask. My friends and I are currently working on our stat project. It's very short and we'll really appreciate...

    Started by lweng‎, 07-20-2011 06:42 PM
    • Replies: 4
    • Views: 1,600
    07-20-2011, 08:45 PM Go to last post
  34. Research Query

    Hello, hope someone can help. I've been having trouble with some data I have collected. I have been taking a series of 12 measurements using three...

    Started by PB66‎, 07-19-2011 11:26 AM
    • Replies: 4
    • Views: 2,889
    07-20-2011, 12:40 AM Go to last post
  35. How to get p-value with categorical dependent var and nominal independent var

    Hi, I'm familiar with most of the univariate tests for significance (chi-square, t-test, 1-way anova, etc.) but I was stumped today. Which test do...

    Started by BME_Guy‎, 07-19-2011 08:25 PM
    • Replies: 1
    • Views: 3,785
    07-19-2011, 08:37 PM Go to last post
  36. Smile Two independent, non-metric categorical variables: which test to use?

    :)Hello! I am new to this forum so first I would like to say hi to everybody and already thank you in advance for your kindness to help me on my...

    Started by Virenque‎, 07-19-2011 03:34 AM
    • Replies: 2
    • Views: 12,217
    07-19-2011, 08:50 AM Go to last post
  37. determening normality in repeated measures ANOVA

    Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

    Started by BBD‎, 01-29-2011 01:47 AM
    • Replies: 6
    • Views: 19,409
    07-19-2011, 05:11 AM Go to last post
  38. Difference between DBLIM and distance-based redundancy analysis???

    Hey there statistical wizards, I have been conducting some statistics using Primer on some ecological data incorporating environmental...

    Started by mycelialgroove‎, 07-17-2011 11:27 AM
    • Replies: 1
    • Views: 4,687
    07-17-2011, 06:07 PM Go to last post
  39. Urgent, which test can I use to test this hypothesis???

    Hi all, please help me I am stuggling doing my data analysis of my poject and my supevisor is on holiday but I have to finish all the ananlysis in...

    Started by nane‎, 07-17-2011 09:47 AM
    2 Pages
    1 2
    • Replies: 18
    • Views: 4,615
    07-17-2011, 05:16 PM Go to last post
  40. F-test Analyis HELP

    I've just carried out an f-test on excel as I want to perform an independent t-test so I wanted to check the equality of variances. I have always...

    Started by cheekychica‎, 07-15-2011 01:30 PM
    • Replies: 4
    • Views: 2,787
    07-16-2011, 03:45 PM Go to last post
  41. Research Help!

    Hi, For my Masters I've captured sales performance and preference for 5 leadership styles. Each style has a rank 1-10 for preference, and there is no...

    Started by james1010‎, 07-14-2011 11:44 AM
    • Replies: 2
    • Views: 1,690
    07-16-2011, 05:43 AM Go to last post
  42. Which test to believe ?

    Hi, I did some analysis, I had 1 scale variable and 1 grouping variable with 2 groups. I ran a t-test and got p value of 0.09. The distribution...

    Started by NN_STAT‎, 07-13-2011 12:19 PM
    • Replies: 10
    • Views: 4,327
    07-16-2011, 02:04 AM Go to last post
  43. which distribution fits...

    Hi I am working on some data describing people arrival at the bus station. For example 08.00-08.10 at the station arrived 9 people/min...

    Started by endri81‎, 07-15-2011 10:26 AM
    • Replies: 2
    • Views: 1,689
    07-15-2011, 11:06 AM Go to last post
  44. Several distributions -how to choose between parametric/nonparametric test

    Hello all! I have 56 distributions and I'm trying to decide whether to use parametric or nonparametric test (only one for all). I used Lilliefors...

    Started by Tikkuhirvio‎, 07-14-2011 05:55 AM
    • Replies: 2
    • Views: 3,001
    07-15-2011, 07:18 AM Go to last post
  45. Npar K-S test acceptable for normailty test??

    hi just testing parametric assumptions and realised that they are 2 ways to check Kolmogorov-Smirnov Test. 1) Analyze-Nonparametric Tests-1-Sample...

    Started by aarong‎, 07-14-2011 01:58 PM
    • Replies: 1
    • Views: 3,330
    07-14-2011, 05:42 PM Go to last post
  46. statistical significance and number of experiments required

    Hi all I have a n*3 matrix. I add guassian noise with mean 0 and SD 1 to this matrix ... My hypothesis is that this noise does not change a...

    Started by azar373‎, 07-14-2011 11:43 AM
    • Replies: 3
    • Views: 2,300
    07-14-2011, 01:04 PM Go to last post
  47. Polynomial interaction in a mixed-design ANOVA

    My analysis includes a between-group factors (condition ) and several within-subjects continuous factors (cholesterol, glucose, mass). The...

    Started by smsdegree‎, 07-13-2011 07:03 PM
    interaction, linear, repeated
    • Replies: 0
    • Views: 3,137
    07-13-2011, 07:03 PM Go to last post
  48. which test I should use?

    hello, i am conducting research on retail atmosphere in which i have collected data on three different retailing sectors i.e furniture retailers,...

    Started by Anoushey Ali‎, 07-13-2011 12:21 PM
    • Replies: 3
    • Views: 2,126
    07-13-2011, 04:09 PM Go to last post
  49. Reduce number of predictor variables ((multi)collinearity): PCA not helpful

    Howdy, The attached spreadsheet contains the correlation matrix of predictor variables and response variable. Correlation exists between them. ...

    Started by nofunsally‎, 06-23-2011 04:31 PM
    • Replies: 11
    • Views: 6,086
    07-13-2011, 10:15 AM Go to last post
  50. Fishy problem- which stat is appropriate? t-test or mann whitney

    Hello kind stats people, I'm in a bind! In my PhD I'm studying fertilisation success of 2 species of fish when they mate with each other. So how...

    Started by SianDiamond‎, 07-13-2011 09:18 AM
    mann-whitney, proportions, t test, which test
    • Replies: 0
    • Views: 2,138
    07-13-2011, 09:18 AM Go to last post
  51. Chi-square test

    Hi all, I'm new here and am doing some research and am certainly not a statistician. Basically I have a dataset with patients who have reported drug...

    Started by fred_1‎, 06-28-2011 04:22 PM
    • Replies: 5
    • Views: 3,280
    07-13-2011, 06:58 AM Go to last post
  52. Time: Ordinal and/or continous?

    I am analyzing a storage study with time points, 34, 68, 102, and 200 days. I also have another variable to consider, which is nominal. I have...

    Started by Lou999‎, 07-11-2011 05:00 PM
    • Replies: 2
    • Views: 2,514
    07-13-2011, 12:15 AM Go to last post
  53. Assessing quintile membership

    Hi, I'm conducting some research into income mobility. The simple model uses OLS to generate the elasticity of income with final earnings as the...

    Started by lmsava‎, 07-12-2011 03:44 PM
    • Replies: 0
    • Views: 1,516
    07-12-2011, 03:44 PM Go to last post
  54. significant or not ?

    Hello, I am trying to find differences of a variable Y among two groups. The distribution among the two groups is not normal, and the variance...

    Started by NN_STAT‎, 07-12-2011 02:00 AM
    • Replies: 0
    • Views: 1,625
    07-12-2011, 02:00 AM Go to last post
  55. Need advice! Math-Stats-ish

    Hi! I'm taking a course in simulation methods. As part of my project, I was able to generate data from a variance-covariance structure that has a...

    Started by jamesmartinn‎, 07-11-2011 12:40 PM
    • Replies: 1
    • Views: 1,760
    07-11-2011, 12:50 PM Go to last post
  56. Unconditional covariance matrices from multivariate GARCH specifications

    Hi all. I thought someone here might be able to help me prove some results which I have not been able to find in journals. Can anyone help me...

    Started by mads_st‎, 07-11-2011 12:07 PM
    • Replies: 0
    • Views: 2,730
    07-11-2011, 12:07 PM Go to last post
  57. Which independent variables for availability of water resources?

    Apologies, this is not really a stat question. I was wondering whether you guys had any ideas on which variables to use as explanatory variables for...

    Started by Sylviastat‎, 07-09-2011 05:16 PM
    • Replies: 2
    • Views: 2,424
    07-10-2011, 08:31 PM Go to last post
  58. matching

    How close in age must subjects be for them to be considered matched for age in an experiment? For example, if I am conducting an experiment on...

    Started by rebecca‎, 07-07-2011 01:20 PM
    • Replies: 3
    • Views: 2,056
    07-07-2011, 02:31 PM Go to last post
  59. Tests for Comparing AUCs for Significant Increases

    I'm currently working on a project aimed at improving some of my program's risk assessment tools. We generally use AUCs to evaluate performance of...

    Started by PsychResearcherRASIS‎, 07-06-2011 11:41 PM
    • Replies: 2
    • Views: 4,446
    07-07-2011, 06:17 AM Go to last post
  60. Proper bayesian scaling of data

    I work as a Ph.D. student in structural bioinformatics, and build bayesian models for our data. It's been quite a while since I stumbled upon the...

    Started by Yannick‎, 07-07-2011 01:32 AM
    bayesian inference, likelihood principle, prior, scale parameter
    • Replies: 0
    • Views: 2,378
    07-07-2011, 01:32 AM Go to last post

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