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# Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

1. ### 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...

• Replies: 14
• Views: 18,620
10-11-2014, 12:02 PM
1. ### Markov Processes

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

• Replies: 0
• Views: 1,607
08-08-2011, 12:49 AM
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...

• Replies: 24
• Views: 8,689
08-06-2011, 10:29 PM
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...

• Replies: 1
• Views: 2,210
08-06-2011, 09:20 PM
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...

• Replies: 2
• Views: 1,926
08-05-2011, 09:45 PM
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.

• Replies: 10
• Views: 3,617
08-04-2011, 05:30 PM

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...

• Replies: 1
• Views: 2,749
08-04-2011, 05:23 PM
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...

• Replies: 1
• Views: 1,889
08-04-2011, 05:21 PM
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...

• Replies: 1
• Views: 1,599
08-04-2011, 02:38 PM
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...

• Replies: 4
• Views: 3,302
08-04-2011, 02:28 PM
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...

• Replies: 1
• Views: 2,791
08-04-2011, 11:37 AM
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...

• Replies: 1
• Views: 2,099
08-04-2011, 10:19 AM
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.

• Replies: 1
• Views: 3,445
08-03-2011, 12:12 AM
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...

• Replies: 2
• Views: 5,653
08-02-2011, 08:09 PM
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...

• Replies: 0
• Views: 1,486
08-02-2011, 04:35 AM
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...

• Replies: 2
• Views: 2,213
Sta
07-30-2011, 03:22 AM
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...

• Replies: 8
• Views: 5,287
07-29-2011, 07:03 AM
17. ### 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...

• Replies: 4
• Views: 1,935
07-28-2011, 08:26 AM
18. ### 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....

• Replies: 5
• Views: 3,169
07-28-2011, 07:54 AM
19. ### 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...

• Replies: 2
• Views: 3,329
07-28-2011, 05:10 AM
20. ### 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...

• Replies: 3
• Views: 1,697
07-28-2011, 03:05 AM
21. ### 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...

• Replies: 16
• Views: 5,970
07-26-2011, 10:11 PM
22. ### 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 ...

• Replies: 0
• Views: 1,372
07-26-2011, 10:01 PM
23. ### 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...

• Replies: 0
• Views: 1,766
07-26-2011, 11:46 AM
24. ### 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...

• Replies: 2
• Views: 1,698
07-25-2011, 06:15 PM
25. ### 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...

• Replies: 0
• Views: 1,597
07-25-2011, 01:20 PM
26. ### '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...

• Replies: 0
• Views: 1,656
07-25-2011, 12:45 AM
27. ### 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...

• Replies: 3
• Views: 1,841
07-24-2011, 02:48 PM
28. ### 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...

• Replies: 4
• Views: 2,334
07-23-2011, 11:55 PM
29. ### 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...

• Replies: 5
• Views: 2,638
07-22-2011, 04:14 PM
30. ### 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...

• Replies: 5
• Views: 3,594
07-21-2011, 02:16 PM
31. ### 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...

• Replies: 2
• Views: 1,779
07-21-2011, 12:54 PM
32. ### 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...

• Replies: 4
• Views: 1,600
07-20-2011, 08:45 PM
33. ### 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...

• Replies: 4
• Views: 2,889
07-20-2011, 12:40 AM
34. ### 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...

• Replies: 1
• Views: 3,785
07-19-2011, 08:37 PM
35. ### 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...

• Replies: 2
• Views: 12,217
07-19-2011, 08:50 AM
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...

• Replies: 6
• Views: 19,409
07-19-2011, 05:11 AM
37. ### 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...

• Replies: 1
• Views: 4,687
07-17-2011, 06:07 PM
38. ### 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...

• Replies: 18
• Views: 4,615
07-17-2011, 05:16 PM
39. ### 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...

• Replies: 4
• Views: 2,787
07-16-2011, 03:45 PM
40. ### 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...

• Replies: 10
• Views: 4,327
07-16-2011, 02:04 AM
41. ### 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...

• Replies: 2
• Views: 1,689
BGM
07-15-2011, 11:06 AM
42. ### 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...

• Replies: 2
• Views: 3,001
07-15-2011, 07:18 AM
43. ### 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...

• Replies: 1
• Views: 3,330
07-14-2011, 05:42 PM
44. ### 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...

• Replies: 3
• Views: 2,300
07-14-2011, 01:04 PM
45. ### 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...

• Replies: 0
• Views: 3,137
07-13-2011, 07:03 PM
46. ### 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,...

• Replies: 3
• Views: 2,126
07-13-2011, 04:09 PM
47. ### 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...

• Replies: 0
• Views: 2,138
07-13-2011, 09:18 AM
48. ### 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...

• Replies: 2
• Views: 2,514
07-13-2011, 12:15 AM
49. ### 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...

• Replies: 0
• Views: 1,516
07-12-2011, 03:44 PM
50. ### 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...

• Replies: 0
• Views: 1,625
07-12-2011, 02:00 AM

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...

• Replies: 1
• Views: 1,760
07-11-2011, 12:50 PM
52. ### 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...

• Replies: 0
• Views: 2,730
07-11-2011, 12:07 PM
53. ### 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...

• Replies: 2
• Views: 2,424
07-10-2011, 08:31 PM
54. ### 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...

• Replies: 3
• Views: 2,056
07-07-2011, 02:31 PM
55. ### 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...

• Replies: 2
• Views: 4,446
07-07-2011, 06:17 AM
56. ### 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...

• Replies: 0
• Views: 2,378
07-07-2011, 01:32 AM

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