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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: 18,714
    10-11-2014, 12:02 PM Go to last post
  1. Test of Significance?

    I want to conduct a significance test in finding the significance between either a C+ vs a B- in AP statistics class will affect chances of attending...

    Started by columbia‎, 06-21-2011 09:49 PM
    3 Pages
    1 2 3
    • Replies: 42
    • Views: 7,681
    06-24-2011, 06:30 PM Go to last post
  2. Question One-tail test for research

    Hello, I am new to research metholologies and statistical testing. Currently, I am involved in the data analysis section of research. My instructor...

    Started by pejmartin‎, 06-26-2011 08:05 PM
    hypothesis testing, one-tail test, quantitative, survey research design
    • Replies: 1
    • Views: 2,285
    06-26-2011, 08:45 PM Go to last post
  3. Individual level moderator in HLM? Need help, please!

    Hi, I'm working on a paper about the influence of a group-level variable on a individual-level variable and want to add an individual-level...

    Started by stef‎, 05-25-2011 07:15 AM
    • Replies: 2
    • Views: 5,681
    06-29-2011, 07:23 AM Go to last post
  4. Power curve of distribution with 2 parameters

    Hello. I want to obtain a power curve for goodness of fit test of a distribution with 2 parameters, let say A & B. My test is actually about...

    Started by tsukiko‎, 06-30-2011 06:43 AM
    hypothesis testing, power, simulation study
    • Replies: 1
    • Views: 2,039
    06-30-2011, 08:42 AM Go to last post
  5. Mancova help

    Hello everyone, I wanted to test the effectiveness of a new teaching method. I asked 5 teachers to use this new method in their classes, and used...

    Started by Ali H‎, 06-30-2011 08:58 AM
    • Replies: 0
    • Views: 1,443
    06-30-2011, 08:58 AM Go to last post
  6. Challenge: dependent variable observed randomly over time

    Hello everyone, I have been working on this problem and couldn't find a solution so any kind of help is more than welcome! I have data ranging...

    Started by Peter_Hoft2‎, 06-29-2011 08:55 AM
    missing, panel data, time series
    • Replies: 1
    • Views: 2,092
    07-01-2011, 01:41 AM Go to last post
  7. Inter-observer variability

    Dear all, I hope so much anyone here may help me with my question regarding inter-observer variability: 3 observers measure the diameter of...

    Started by med1234‎, 06-29-2011 06:15 PM
    • Replies: 13
    • Views: 23,607
    07-02-2011, 06:36 PM Go to last post
  8. Pre and Post Likert Scale Survey Help

    Hi, I am needing some help with a survey I am trying to get ready to conduct. The survey will be a pre and post survey given to the same group of...

    Started by rx_student‎, 07-05-2011 11:22 AM
    • Replies: 1
    • Views: 4,363
    07-05-2011, 11:27 AM Go to last post
  9. Difficult forecasting/ density estimation problem in an experimental setting

    Hi everyone, I am researcher conducting a set of economics experiments that are eventually supposed to produce some forecasts for a given player’s...

    Started by whaddup‎, 07-02-2011 04:23 PM
    • Replies: 4
    • Views: 3,205
    07-05-2011, 12:27 PM Go to last post
  10. Help needed with Multiple Correspondence Analysis

    Greetings, I am looking for resources (books, websites, articles) that can help me, in the simplest way possible (i.e. step by step), figure out...

    Started by rhazlettknudsen‎, 07-05-2011 04:08 PM
    • Replies: 2
    • Views: 3,902
    07-05-2011, 06:54 PM Go to last post
  11. What statistical model could possibly be used here?

    Hi guys, Could you please have a look at the chart attached? I'm just wondering what statistical model could possible be used here to create that...

    Started by JennyK‎, 07-06-2011 12:09 AM
    • Replies: 0
    • Views: 1,959
    07-06-2011, 12:09 AM Go to last post
  12. paired t test and simple linear regression

    Two repeatedly measured samples: 15 subjects were measured by two different machines (old and new) for their weight subject machine 1 machine...

    Started by manoa‎, 07-06-2011 04:48 PM
    • Replies: 3
    • Views: 11,407
    07-06-2011, 05:48 PM Go to last post
  13. 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: 2,400
    07-07-2011, 01:32 AM Go to last post
  14. 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: 4,468
    07-07-2011, 06:17 AM Go to last post
  15. 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: 2,079
    07-07-2011, 02:31 PM Go to last post
  16. 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: 2,446
    07-10-2011, 08:31 PM Go to last post
  17. 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: 2,744
    07-11-2011, 12:07 PM Go to last post
  18. 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: 1,769
    07-11-2011, 12:50 PM Go to last post
  19. 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: 1,641
    07-12-2011, 02:00 AM Go to last post
  20. 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: 1,524
    07-12-2011, 03:44 PM Go to last post
  21. 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: 2,530
    07-13-2011, 12:15 AM Go to last post
  22. 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: 3,302
    07-13-2011, 06:58 AM Go to last post
  23. 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: 2,176
    07-13-2011, 09:18 AM Go to last post
  24. 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: 6,106
    07-13-2011, 10:15 AM Go to last post
  25. 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: 2,141
    07-13-2011, 04:09 PM Go to last post
  26. 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: 3,147
    07-13-2011, 07:03 PM Go to last post
  27. 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: 2,310
    07-14-2011, 01:04 PM Go to last post
  28. 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: 3,378
    07-14-2011, 05:42 PM Go to last post
  29. 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: 3,042
    07-15-2011, 07:18 AM Go to last post
  30. 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: 1,703
    07-15-2011, 11:06 AM Go to last post
  31. 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: 4,351
    07-16-2011, 02:04 AM Go to last post
  32. 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: 1,701
    07-16-2011, 05:43 AM Go to last post
  33. 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: 2,802
    07-16-2011, 03:45 PM Go to last post
  34. 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: 4,669
    07-17-2011, 05:16 PM Go to last post
  35. 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: 4,703
    07-17-2011, 06:07 PM Go to last post
  36. 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: 19,524
    07-19-2011, 05:11 AM Go to last post
  37. 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: 12,277
    07-19-2011, 08:50 AM Go to last post
  38. 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: 3,797
    07-19-2011, 08:37 PM Go to last post
  39. 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: 2,924
    07-20-2011, 12:40 AM Go to last post
  40. 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: 1,612
    07-20-2011, 08:45 PM Go to last post
  41. 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: 1,797
    07-21-2011, 12:54 PM Go to last post
  42. 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: 3,618
    07-21-2011, 02:16 PM Go to last post
  43. 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: 2,667
    07-22-2011, 04:14 PM Go to last post
  44. 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
    • Replies: 4
    • Views: 2,353
    07-23-2011, 11:55 PM Go to last post
  45. 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: 1,851
    07-24-2011, 02:48 PM Go to last post
  46. 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: 1,663
    07-25-2011, 12:45 AM Go to last post
  47. 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: 1,607
    07-25-2011, 01:20 PM Go to last post
  48. 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: 1,706
    07-25-2011, 06:15 PM Go to last post
  49. 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: 1,779
    07-26-2011, 11:46 AM Go to last post
  50. 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: 1,385
    07-26-2011, 10:01 PM Go to last post
  51. 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: 6,100
    07-26-2011, 10:11 PM Go to last post
  52. 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: 1,707
    07-28-2011, 03:05 AM Go to last post
  53. 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: 3,343
    07-28-2011, 05:10 AM Go to last post
  54. 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: 3,186
    07-28-2011, 07:54 AM Go to last post
  55. 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: 1,947
    07-28-2011, 08:26 AM Go to last post
  56. 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: 3,496
    07-28-2011, 10:47 AM Go to last post
  57. 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: 5,303
    07-29-2011, 07:03 AM Go to last post
  58. 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: 2,233
    07-30-2011, 03:22 AM Go to last post
  59. 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: 1,497
    08-02-2011, 04:35 AM Go to last post
  60. 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
    • Replies: 2
    • Views: 5,670
    08-02-2011, 08:09 PM Go to last post

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