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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: 18,708
10-11-2014, 12:02 PM
1. ### Trend Stationarity vs. Level Stationarity

Can s.b. explains the difference between Trend Stationarity and Level Stationarity?

• Replies: 0
• Views: 2,342
03-14-2013, 10:18 PM
2. ### Scientific articles about statistics

I thought we could gather various interesting articles here. A general rule is that it should be about statistical methods or mathematical...

• Replies: 2
• Views: 2,748
03-14-2013, 03:49 PM
3. ### No idea what tests to use!

** (P) (c) (f) (s) 3A 1 0 1 0 3B 1 1 1 1 ...

• Replies: 2
• Views: 2,246
03-14-2013, 11:45 AM
4. ### Factor Scores

I'm working on a political science project in which a number of the crucial variables are highly correlated. My approach would be to create factor...

• Replies: 0
• Views: 1,207
03-14-2013, 08:09 AM
5. ### MANOVA: IV with only two levels

Hi, I'm a biological science university student with an interest in teaching myself some basic inferential statistic and have been learning about...

• Replies: 2
• Views: 1,628
03-14-2013, 06:48 AM
6. ### Te assumption of Normality

Hello i have some variables which consists of 41 cases,those cases represent averages of many cases,that is, for each case the average is calculated...

• Replies: 4
• Views: 1,742
03-14-2013, 06:04 AM
7. ### Chi and linear-by-linear

A quick question about the use of linear-by-linear association tests for small samples - with a structure greater than 2X2. As we know, a chi...

• Replies: 4
• Views: 4,542
03-14-2013, 01:37 AM
8. ### Dimensionalities in Multi-Dimensional Scaling

Hello all, :wave: I'm conducting market research and want to use compositional Multi-dimensional scaling to create perceptual maps of Brand...

• Replies: 2
• Views: 1,776
03-14-2013, 12:49 AM
9. ### Survival Analysis

Hello i have a group of varaibles which represent 251 variables express the GPA of the student(averages) througout 41 semester...what kind of...

• Replies: 2
• Views: 2,083
03-13-2013, 02:19 PM
10. ### Low Cronbach alpha on recognised instrument

Hi, I am using a standard survey instrument that during a meta analysis over 15 years has shown a relability of 0.73 for a particular facet. I...

• Replies: 18
• Views: 15,832
03-13-2013, 07:08 AM
11. ### Comparison between two joint probability distributions

I have two bivariate tables with variables "Birth Order" (with birth order 2, 3, 4 and 5) on one side and "Birth Interval" (with intervals 10-15,...

• Replies: 0
• Views: 2,225
03-12-2013, 05:24 AM
12. ### How to calculate ARIMA(1,0,1)

Hello, I want to forecast the 101th data of a time series and my data is as follow 99) 0.96 100) -0.2495 101) ? and my model Coefficients: ...

• Replies: 1
• Views: 2,779
03-12-2013, 02:17 AM
13. ### What is the purpose of multigroup invariance test?

Hi, I am confused about the purpose of multigroup test. According to Byrne (2008), many studies focus on multigroup comparisons, and assume two...

• Replies: 2
• Views: 1,941
03-10-2013, 08:52 PM
14. ### Can fixed effects models deal with nested data?

I'm reading a paper now: English teacher candidates developing dialogically organized instructional practices (2013) The authors state (LINK...

• Replies: 4
• Views: 4,467
03-10-2013, 03:41 PM
15. ### creating a variable

MY hypothesis is the following: The demographic variable of age has a significant impact on the relationship between organizational trust and the...

• Replies: 1
• Views: 1,515
03-09-2013, 02:48 PM
16. ### Need help developing a metric that controls for variation between languages

I need help of people with experience developing formulas and I am far from an expert on the subject. I want ideas for developing a metric that would...

• Replies: 0
• Views: 1,258
03-08-2013, 08:40 AM
17. ### Statistical books (social sciences / policy analysis)

Hello everyone! Next year I will be doing a MSc program in policy analysis at University of Leuven in Belgium. It's been a few years since I...

• Replies: 4
• Views: 1,906
03-06-2013, 09:48 AM
18. ### Can Mac process 10GB data?

I have got a very large dataset and need a computer that has the capacity of processing 10GB data. Is an Mac a good option? Also, what kind of...

• Replies: 0
• Views: 1,161
03-05-2013, 10:45 PM
19. ### Input needed on an current model to answer research question

Hi, I'm currently working on a research project and would appreciate any input or suggestions. In the study, we examined breast cancer...

• Replies: 4
• Views: 1,455
03-05-2013, 05:11 PM
20. ### unbiased estimators

in order to estimate the area of a squared field, two independent measures were taken of one of the sides: X1 and X2 two estimators were...

• Replies: 6
• Views: 2,247
03-05-2013, 11:57 AM
21. ### pre- post- intervention survey analysis

Hi all, I am trying to figure out how to analyze survey results administered as part of a randomized trial. We drew random samples of households...

• Replies: 13
• Views: 5,516
03-05-2013, 11:42 AM
22. ### Gaussian Processes - Wiener process - The drunk particle

Hello, I recently read about Gaussian Processes (http://en.wikipedia.org/wiki/Gaussian_process) for non linear regression. I am not an expert but...

• Replies: 0
• Views: 2,243
03-04-2013, 12:21 PM
23. ### Hierarchical (nested) ANOVA non-significant interactions

Hi, I am trying to build and test models in hierarchical Analysis of Variance. I wondered if someone could offer some advice as to what to do if...

• Replies: 4
• Views: 1,653
03-04-2013, 08:03 AM
24. ### Lempel-Ziv Compression Test

Dear All, Does anybody knows about the Lempel-Ziv Compression Test? I know that it is for randomness of a time series but not too much information...

• Replies: 1
• Views: 2,320
BGM
02-27-2013, 02:15 PM
25. ### What to review before starting a PhD in statistics?

Hello everyone, I will be starting a PhD program soon on a topic mainly related to bayesian statistics, sequential Monte-Carlo methods and...

• Replies: 1
• Views: 1,148
02-27-2013, 10:55 AM
26. ### Panel design for experiment

Hello everyone, I'm currently setting up an empirical experiment which I would like to analyze via a panel analysis (but any other would also do...

• Replies: 0
• Views: 1,114
m_m
02-27-2013, 05:32 AM
27. ### Mediation results where MV and IV become insignificant

I have been running some mediation models and have come across a finding where individually the IndVar-DepVar and Mediator-DepVar relationships are...

• Replies: 0
• Views: 1,668
02-26-2013, 06:42 PM
28. ### Partial Correlation when one variable and the control are two-level ordinal variables

I have one numerical variable and another two-level ordinal variable(e.g., one level is 27 and the other 51). I could classify it as a dichotomous or...

• Replies: 9
• Views: 10,232
02-26-2013, 05:40 PM
29. ### question about 3 variables

Good evening good people, I hope to get some help and good advice from you. The problem is follow: 1. I have one big questionnaire with...

• Replies: 0
• Views: 1,643
02-25-2013, 02:18 PM
30. ### Ideal method of imputation when all variables have missing data?

Need to impute data for a large data set - all variables except 1-2 contain missing data so multiple imputation isn't working well. Any suggestions...

• Replies: 3
• Views: 1,618
02-23-2013, 11:52 PM
31. ### Repeatability and Reproducibility

Hi, I'm new to this and I'm not exactly a math expert. I am carrying out research in a lab, and I want to test repeatability and reproducibility of...

• Replies: 2
• Views: 2,725
02-21-2013, 10:25 AM
32. ### Fixed and random effect models?

I've come across these model names in the literature and don't have that much background info on the topic. I was reading some definitions I found by...

• Replies: 1
• Views: 1,466
02-20-2013, 06:34 AM
33. ### Assumptions for an ARIMA(p, d, q) model (Box-Jenkins)

I have a data set which is stationary but the histogram looks like a logaritmic distribution. Is this a problem? Is normality an assumption to use...

• Replies: 1
• Views: 6,126
02-18-2013, 12:52 PM
34. ### Sloppy financial stats

I'm looking for a rough estimate of the probability that an annual increase in a market price will be less than i) 50% and ii) 70% (on any given...

• Replies: 1
• Views: 1,073
02-18-2013, 04:39 AM
35. ### Do support vector machines automatically do variable selection ?

Using the R command svm = svm(res~.,probability = T,type="nu-classification",data = train,cross=5) Does this "eliminate" variables so my svm...

• Replies: 0
• Views: 1,592
02-17-2013, 08:59 PM
36. ### Testing Mediation

Hi All, I have a general question about the Mediation analysis using Hayes Soble test. My Question is : If there is no correlation between path b...

• Replies: 0
• Views: 1,206
02-16-2013, 02:04 PM
37. ### What to do when number of variables is greater than number of observations?

What are some techniques that are utilized when the number of predictors is greater than the number of observations?

• Replies: 15
• Views: 6,743
02-15-2013, 02:36 PM
38. ### Need urget help for one sample z test of proportions

Hi All, I need to confirm whether I am doing it correctly. Survey question is: Have you ever witnessed violent episodes/incidents in the...

• Replies: 8
• Views: 1,836
02-14-2013, 05:42 AM
39. ### ANOVA help? :)

Basically i have two sets of data collected from two different locations. I know that both sets of data are not normally distributed, so they will...

• Replies: 5
• Views: 1,119
02-13-2013, 05:32 PM
40. ### Goodness of Fit Applicability

I'm Looking for some advice on comparing the results of two different sampling methods (sampling the same population) against each other. The two...

• Replies: 2
• Views: 1,229
02-13-2013, 05:09 PM
41. ### What sample size do you need to not do signficance test

Not really a statistical question I know.... This is covered in detail on another thread, but because of limits on my data I can not calculate a...

• Replies: 4
• Views: 1,253
02-13-2013, 02:43 PM
42. ### Which statistical test? Help

Hi I am stumped on what statistical test to used and was looking for some advice for a present study. There is one IV: experimental vs control...

• Replies: 1
• Views: 1,209
02-13-2013, 12:19 PM
43. ### Reliability/Survival - Where to start?

General question: I want to examine the reliability/durability of an item that deteriorates every time it is used. Let's say the subject in question...

• Replies: 0
• Views: 1,187
agp
02-13-2013, 10:48 AM
44. ### Question about working with longitudinal data and z scores

I was hoping someone could help me or point me in the right direction. The outcome variable for my study will be change in math scores over 3 years....

• Replies: 0
• Views: 1,496
02-12-2013, 04:52 PM
45. ### Need quick reply

If I have three categories (yes, no and don't know) for a single variable (say Effective_policies_in_hospital) with 50% 25% and 25% respectively... I...

• Replies: 0
• Views: 1,251
02-12-2013, 09:22 AM
46. ### Low porbability from logistic regression

Hi, I am facing a situation where I have very low probabilities (ave ~0.0008) after I performed the logistic regression. My original data...

• Replies: 0
• Views: 1,534
02-09-2013, 01:38 AM
47. ### Cluster analysis or factor analysis?

I'm trying to decide which route to proceed for a project I am working on, any input is appreciated. Data: 228 by 10,000 matrix. 114 subjects'...

• Replies: 1
• Views: 1,353
02-09-2013, 12:34 AM
48. ### MLE for correlation (not covariance) matrix?

Is there an efficient way to estimate the correlation matrix for the D-dimensional r.v. \mathcal X = (\mathcal X_1, \ldots, \mathcal X_D) under the...

• Replies: 4
• Views: 3,669
02-08-2013, 11:33 AM
49. ### Bayesian Modeling Question

:rolleyes:

• Replies: 3
• Views: 1,395
02-07-2013, 11:44 PM
50. ### non-parametric t-test with mean/SD = 0

Hi All, quick question on non-parametric t-test I have 2 groups. 7 values each. Group One= 0, 0, 0, 0, 0, 0, 0 which of course is mean=0 and...

• Replies: 5
• Views: 3,535
02-05-2013, 11:24 PM
51. ### statistical analysis- ANOVA, t test, questionnaire

Hi all, I am doing a mini research in HCI filed which examine the differences between pen touch and finger touch on specific Smartphone. I have...

• Replies: 5
• Views: 3,385
02-04-2013, 04:44 PM
52. ### Correlation coeff vs. Logistic Regression Coeff.

From a bunch of data points which look like: 1 1 1 1 1 1 1 1 1 1 0 1 1 0 1 1 0 0 1 0 1 1 0 0

• Replies: 1
• Views: 1,457
02-01-2013, 11:33 AM
53. ### Fixed and Random Effects in Mixed Modeling

Thank ahead of time for any help. I am analyzing time series data. Originally I was running Repeated Measures ANOVA and entering between subjects...

• Replies: 2
• Views: 1,954
02-01-2013, 07:40 AM
54. ### Analytic options with multi-level data?

Hello, I've been struggling with choosing an analytical approach to some multi-level data (3 level) I'm working with and wanted to get some fresh...

• Replies: 12
• Views: 2,883
01-31-2013, 01:15 PM
55. ### Examples of Repeated measures Poisson Model

Does anyone have a good example of repeated measures Poisson Model? I want to try paired Poisson GLM to analyze so called spectral count data. In...

• Replies: 0
• Views: 2,560
Jyk
01-29-2013, 05:05 PM
56. ### Which correlation method is correct.

I had a thread on this already, but can not find it.:shakehead I found a way to do polychoric correlations. A SAS macro. But I am not sure if the...

• Replies: 0
• Views: 1,903
01-29-2013, 03:27 PM
57. ### Confusions regarding Regression, Multicollinearity and Factor Analysis

I am currently working with a data set that contains about 26 IVs of almost all sorts of scale of measurement (binary, nominal, ordinal and interval...

• Replies: 2
• Views: 3,137
01-29-2013, 03:18 PM

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