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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: 18,756
10-11-2014, 12:02 PM
1. ### Sample Size - Mathematical proof

Hi, I am currently trying to find out the mathematical proof for my chosen sample size. I have referred to the table below and found out that my...

• Replies: 2
• Views: 3,121
12-21-2012, 11:53 AM
2. ### The joint normality of the two estimates for linear regression model

I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

• Replies: 13
• Views: 3,118
BGM
12-22-2012, 12:27 PM
3. ### Moderated Mediation Macro Limitations

Hello! I am currently working on my thesis and my data seems to fit a moderated mediation model but I'm up against some of the MODMED limitations....

• Replies: 6
• Views: 3,110
07-13-2013, 05:43 PM
4. ### 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...

• Replies: 1
• Views: 3,109
12-29-2008, 12:34 AM
5. ### Likert/Chi-square

Hello, I'm working on my analysis of my Graduate Capstone Project and was hoping to get some feedback to see if what I plan on doing is correct. ...

• Replies: 1
• Views: 3,109
Mr5
12-15-2010, 09:34 PM
6. ### Question on Bootstrap Inference

Hi All, Say I have a time series X of length T that is split into two subperiods: X1 = X(0),X(1),...,X(T-n) and X2 = X(T-n+1),X(T-n+2),...,X(T),...

• Replies: 0
• Views: 3,105
01-26-2011, 04:38 AM
7. ### Unobserver Component Models for Forecasting vs ARIMA and Expoential Smoothing

Hello, I read in textbooks and in forecasting software manuals that Unobserverd Components Models have the flexibility and are as powerfull as...

• Replies: 0
• Views: 3,104
10-15-2011, 12:00 PM
8. ### Estimated Parameter as Dependent Variable

Hi, Would anybody be able to help me with the following problem? That would be great!! :) In my analysis I follow a two-step approach. In the...

• Replies: 2
• Views: 3,104
12-01-2016, 02:37 PM
9. ### VERY RELEVANT MORTGAGE-RESEARCH in this crisis

Within the firm I work for the question exists whether there are common characteristics within (between) more or less 900 cases/dossiers which we...

• Replies: 4
• Views: 3,102
05-27-2009, 08:39 PM
10. ### Friedman test -- post hoc

Good day, I am willing to compare n sample means (where n > 2) of random variables. I am willing to use Friedman test to see if there is any...

• Replies: 0
• Views: 3,102
11-12-2011, 03:02 PM
11. ### Modeling residual variance in regression

Hi all Consider an ordinary linear regression model. The residuals are assumed to be normally distributed on N(0,sigma). I believe it is possible...

• Replies: 2
• Views: 3,100
01-05-2012, 10:07 AM
12. ### categorical variable as covariate in ANOVA?

Hi, I have a within-subject factor with 3 levels and find no main effect when I do an ANOVA. I kind of predict that this is due to the...

• Replies: 1
• Views: 3,098
01-22-2013, 10:47 AM
13. ### obtain inter-aarival from bulk arrival

I have some data regarding the arrival of customers at a shop. These arrivals are bulk arrivals which have been collected at fixed time intervals...

• Replies: 16
• Views: 3,095
02-19-2017, 05:24 PM
14. ### nonparametric estimate the distribution with a histogram only

Suppose X1,.., Xn ~iid F with mean mu_F The data is summarized in a histogram and that is all I have. I don't have the individual Xi (i = 1,...,n)....

• Replies: 3
• Views: 3,092
BGM
03-24-2011, 11:47 PM
15. ### data transformation software

Does anyone know of any software that will transform data to normality for me? specifically first one: lognormal second one:burr(4p) third one:...

• Replies: 2
• Views: 3,090
08-17-2010, 01:08 PM
16. ### Independent t test - small sample size - use all data points?

Hi there, I am running a small study in which both treatment (n = 7) and control groups (n= 6) have undertaken the same 48 item rating scale task...

• Replies: 1
• Views: 3,088
12-29-2011, 05:40 AM
17. ### fixed or random factor for ANOVA

I've had a discussion with a colleague over the proper way to analyse results of an experiment. We tested the performance of 6 subjects in a...

• Replies: 1
• Views: 3,087
09-19-2011, 08:12 PM
18. ### inter-rater reliability with multiple raters - sample size determination

Hi I will have to condact a obserbational test with multiple raters. Basically the raters have to obserbe subjects, and rate (categorical data) the...

• Replies: 0
• Views: 3,082
JFI
09-25-2012, 03:41 PM
19. ### Cohort

Hi everyone Is sent my research proposal to ethic committee, the study design is prospective cohort. I got a reply that i should change my study...

• Replies: 4
• Views: 3,080
11-18-2011, 01:04 PM
20. ### Numerical Maximization of Massive Expression

Hey,guys! I am real sorry if the question has been already asked, but I am really stuck with something.... I have a Likelihood Function , it...

• Replies: 4
• Views: 3,076
01-26-2011, 05:01 PM
21. ### HLM or MANOVA/MANCOVA

Hello, For my study, I will use a data set that includes 22 schools, 2 to 20 teachers in each school, and 4 students from each teachers'...

• Replies: 0
• Views: 3,073
HHH
11-11-2014, 10:27 AM
22. ### Choosing bachelor's thesis topic

Hello everyone. I am going to make research on statistics/data analysis for my bachelor's thesis. What are the popular areas of research in...

• Replies: 0
• Views: 3,068
11-19-2016, 09:49 AM
23. ### Mixed Model Covariance Structure

I have a study with a somewhat unique experimental design which I would like to used Mixed Modeling to analyze. All subjects in the study were...

• Replies: 0
• Views: 3,064
03-24-2011, 08:28 PM
24. ### Justification for Levene's test?

Take an example where the variance of two samples is truly heterogeneous: Sample 1 weights - 100, 140, 160, 200 Sample 2 weights - 10, 14, 16, 20 ...

• Replies: 7
• Views: 3,061
11-28-2012, 06:27 AM
25. ### Student's T-test versus one-way ANOVA

I need help on deciding which statistical test to report. This is not really a statistics problem per say, I've done the calculations already. My...

• Replies: 1
• Views: 3,060
04-06-2014, 09:45 AM
26. ### sure independence screening in clustering

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• Replies: 3
• Views: 3,059
11-23-2016, 01:01 AM
27. ### Hypothesis Testing question. Is it Null or Alternative? More details.

Hello. I'm new here and its going to be my first thread(excluding my introduction thread). I hope I'm posting this thread on the right section. ...

• Replies: 1
• Views: 3,056
10-03-2011, 04:39 PM
28. ### Kruskal Wallis test and problem with zeros

Hi. I am conducting a biological research about species abundance variations between different hours and localitions. I am comparing 11...

• Replies: 0
• Views: 3,055
07-09-2012, 07:19 PM
29. ### what am i supposed to do?

Let X_1,X_2,........,X_n ~ N(\mu,\sigma^2), both \mu and \sigma^2 unknown. Find the value of b which minimizes the MSE of the estimator...

• Replies: 8
• Views: 3,053
11-02-2010, 11:22 AM
30. ### T scores & a Multivariate Analysis

4 tests were administered to 2 different groups. The scales of measurement for the tests were different, so the raw scores were converted to...

• Replies: 1
• Views: 3,052
05-30-2007, 12:02 AM
31. ### 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: 3,052
07-15-2011, 07:18 AM
32. ### Lanczos' Algorithm for Sparse Matrices

I just have a quick question about the implementation of lanczos' algorithm. If you are unfamiliar with it, it can be found at...

• Replies: 0
• Views: 3,050
06-24-2008, 10:44 AM
33. ### Nonparametric regression

Hi guys, can someone recommend a good source to learn about kernel regression or spline smoothing and perhaps how to compare two plots to each other?

• Replies: 2
• Views: 3,047
11-17-2009, 01:06 AM
34. ### Likert scale - questionnaire administered twice - longitudinal study

Hi, I am running a longitudinal study which lasted for few months during which all participants used a specific communicaiton device. I conducted...

• Replies: 1
• Views: 3,040
04-22-2011, 06:34 PM
35. ### Combining Variables to Fill Missing Data

Summary of Problem: 1. I want to combine three similar variables to fill severe missing data problem. Significance of problem: 1. My data is...

• Replies: 0
• Views: 3,039
12-02-2010, 05:19 AM
36. ### metropolis algorithm for ising model

Hi i'm looking for some help with trying to understand how to use the metropolis algorithm for the 2D ising model. In the problem i am trying to...

• Replies: 0
• Views: 3,035
11-19-2010, 06:34 AM
37. ### Dealing with regression to the mean

If I have two time points T1 and T2 and separate the groups based on their performance at T1 (High v Low), then after treatment assess their...

• Replies: 4
• Views: 3,034
01-12-2017, 10:52 PM
38. ### 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) +...

• Replies: 0
• Views: 3,033
SVM
01-17-2009, 11:22 PM
39. ### Post hoc test

I want to run a post hoc test along with my MANOVA, but I don't know which post hoc test to run. I am looking at the difference in prey preference...

• Replies: 1
• Views: 3,032
03-25-2010, 04:24 AM
40. ### attrition: comparing *surviving* sample to original

Hi, I have a question about attrition analyses in longitudinal databases. I know that I can compare the subjects who dropped out...

• Replies: 4
• Views: 3,030
11-19-2006, 03:33 PM
41. ### Does anyone know what associated means??

I have a stochastic process. Think of it as an assembly line. For the ith item that enters the process it produces a total work time of Y(ti). A...

• Replies: 1
• Views: 3,022
08-06-2010, 10:55 AM
42. ### How have you dealt with missing values?

I'm currently conducting a large content analysis on company disclosures and have a lot of missing values. I've been looking at different ways to try...

• Replies: 0
• Views: 3,021
06-21-2010, 11:54 PM
43. ### What non-parametric test should I use?

Hi all, I am looking for some help on finding an appropriate test to analyse the variance between groups. The data I am assessing is: -...

• Replies: 1
• Views: 3,020
12-21-2016, 01:24 AM
44. ### G*Power 3.12 Help

Hi all, I'm brand new to the forum and relatively new to the world of research. I'm an undergraduate preparing for graduate studies. If this is...

• Replies: 0
• Views: 3,019
01-06-2011, 11:09 AM
45. ### Pearson's chi-test for more than 2x2

So, I have one stat book (Discovering Statistics by Andy Field; great book) that discusses Pearson's chi-test and how it's only applicable to a 2x2...

• Replies: 2
• Views: 3,012
08-23-2012, 04:30 AM
46. ### How to describe data that trends to a horizontal aymptote?

Hi all, I'm designing a within-subject experiment with one independent variable X, where we are expecting the dependent variable to increase...

• Replies: 0
• Views: 3,010
08-05-2010, 01:13 PM
47. ### von Neumann test for trend analysis

Hi! Recently, I’ve come across von Neumann test for trend detection. I cannot find whether it has any particular assumptions – any info (as well...

• Replies: 0
• Views: 3,010
06-03-2013, 05:49 AM
48. ### p-value for nearest neighbor classification

Hi all, For the past few days, I have been trying to compute a p-value for some experiment I ran recently, and I simply cannot figure it out. ...

• Replies: 4
• Views: 3,009
11-24-2013, 03:58 AM
49. ### HLM-Longitudinal Analysis: Moderation in level 2 variables?

Hi, I am creating a growth model using HLM 7 where Level 1 is Occasion and Level 2 is Person. I am trying to see if I can test the moderation...

• Replies: 0
• Views: 3,005
12-11-2012, 07:11 PM
50. ### Bayesian approach to comparing parameters of two distributions

This is my first post here, and I'm hoping that someone can help me with a stats problem. I don't have much formal training, but I'll do my best to...

• Replies: 4
• Views: 3,004
05-09-2012, 02:20 PM
51. ### How many random events to cover everything with 95% confidence?

Ok so I have what I believe to be a rather easy question, which I even feel I should be able to solve myself, but I can't... I hope someone can help...

• Replies: 4
• Views: 3,002
09-22-2010, 03:14 AM
52. ### question about null hypothesis??

here is my question: in my minor thesis, based on my theoretical framework, i have a hypothesis that stated that: "the score of group A is the same...

• Replies: 7
• Views: 3,002
01-27-2012, 04:37 AM
53. ### two probability levels in regression tables

I was wondering if is is common practice to identify betas that are significant at either the .05 and .001 level. e.g., If I decide to set my p level...

• Replies: 1
• Views: 2,999
06-24-2009, 01:24 AM
54. ### Generalized estimating equations and multiple imputation

Hi, I'm running a Generalized estimating equation model with multiple imputed data but I can not get a pooled outcome. Do anyone have a solution to...

• Replies: 4
• Views: 2,999
10-29-2014, 03:06 PM
55. ### MANOVA Help

Help me please! I do not know how to interpret these stats...can someone help me answer these and explain how you got the answers... Box's Test of...

• Replies: 0
• Views: 2,998
05-08-2011, 10:47 PM
56. ### Need Help in identifying problem

Hello all, Imagine you have two time series X1,X2,...Xt - represents incoming volume to the yard, and Y1,Y2,...,Yt - outgoing volume from the...

• Replies: 2
• Views: 2,993
07-06-2010, 08:36 PM

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