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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: 18,746
10-11-2014, 12:02 PM
1. ### Necessary condition analysis

Hi, I have a research problem where I have to identify a necessary condition. I have three data series, X, Y, Z. say, Z is the dependent variable and...

• Replies: 1
• Views: 2,036
05-25-2016, 02:48 PM
2. ### what is the difference between latent class analysis and factor analysis?

I read some papers and most of them used EFA/SEM, and one paper used LCA (latent class analysis). So, when do you need to use LCA but not FA? It...

• Replies: 2
• Views: 3,792
06-22-2015, 05:04 PM
3. ### chi square test to test difference for 5x2

My data has two groups people, VV and NV, and I want to test the difference in their occupation. The occupation were 5 groups: farm/fh, farmer/fh,...

• Replies: 1
• Views: 1,488
04-27-2016, 07:47 PM
4. ### Regression Model

wefwefwfweff

• Replies: 3
• Views: 3,912
06-04-2010, 09:04 AM
5. ### Modified bland Altman- plotting difference aganst the criterion measure

Hi all, I am measuring the agreement between a movement sensor that estimates VO2 in humans during exercise and criterion VO2. My supervisor advised...

• Replies: 0
• Views: 1,995
11-01-2014, 08:05 AM
6. ### T Test

I am trying to do a weighted mean ttest. The statistics I'm using are the vote shares for republican and democrat women candidates in primary...

• Replies: 1
• Views: 1,739
11-30-2014, 07:01 AM
7. ### Statistical analysis on redistricting and women in office; sample size, ideas??

Okay. I have this huge paper that I've been working on for umpteen thousand years. I really need to graduate from college. The question: how does...

• Replies: 0
• Views: 1,024
10-20-2015, 06:24 AM
8. ### Should I use Bonferroni (or other similar corrections)?

Hello! I am new in this forum, I have a question and I hope you could help me! :p Suppose that I have to measure 10 independent variables on 60...

• Replies: 0
• Views: 1,114
01-08-2016, 03:57 AM
9. ### Are they misunderstanding ANOVAs here?

Hi, Here's an extract from a paper I'm using in a systematic review: The mean GAD-7 score of the sample prior to the course was 10.98 (SD 5.17,...

• Replies: 8
• Views: 2,468
10-24-2014, 11:22 AM
10. ### chi-square with small sample size

I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

• Replies: 6
• Views: 8,978
05-20-2011, 12:24 PM
11. ### How to rank factors of a confirmatory factor analysis?

Hey there, within my current study I would like to determine the importance of different behavioral intentions. Since behavioral intentions are...

• Replies: 0
• Views: 1,679
01-30-2017, 05:52 PM
12. ### 2 x 4 Factorial Design and contrasts...

Question... I have a 2 (gender) x 4 (Drug Dose) design Gender - Male - Female Dose - 200 - 400 - 600 - 800

• Replies: 2
• Views: 12,366
11-30-2008, 11:37 PM
13. ### Ranking advertisers based on performance

Hi, let's say you run an ad network and you want to rank your advertisers based on their performance. Now what most networks do is simply...

• Replies: 3
• Views: 2,902
07-13-2010, 02:23 PM
14. ### Model Suggestions?

Hello Stat experts - I'm hoping to find some inspiration in a project I'm doing. I have some longitudinal data, 15 series of measurements ...

• Replies: 2
• Views: 2,500
05-20-2010, 08:07 AM
15. ### Policy chance analysis - time series count data

Hi, I need some help to determine my approach. For a school project I would like to examine the effect of a policy change in the Danish...

• Replies: 0
• Views: 917
04-18-2016, 07:01 AM
16. ### non parametric hierarchical regression?

Hello, I have non parametric data and need to condcut a regression with covariates as well. I have tried to transform the data but still they are...

• Replies: 4
• Views: 5,562
08-30-2011, 03:43 PM
17. ### sample size - power calculations

Hi, would be great if anybody could help me on this. I want to estimate the impact of an independent variable x (lets say a social program) on the...

• Replies: 1
• Views: 4,357
06-23-2009, 12:01 AM
18. ### Studies Quality Assesment: interpreted univariate analysis, adjusted for confounding?

Hello, I am conducting a systematic review on mostly cohort studies. One part of my quality assessment is of course; if the observational study...

• Replies: 0
• Views: 891
07-25-2016, 08:35 AM
19. ### Which statistical model to choose?

Hey guys, I have a few hypotheses in a randomized control trial that I would like to test: 1) Effect of a treatment on several outcome...

• Replies: 0
• Views: 847
08-15-2016, 12:58 PM
20. ### 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: 3,107
Mr5
12-15-2010, 09:34 PM
21. ### Modelling Categories and Data

Hi, any help would be greatly appreciated. I am trying to create growth models for different tree species which correlate tree weight with height....

• Replies: 0
• Views: 1,654
03-30-2011, 05:51 AM
22. ### 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: 3,026
11-19-2006, 03:33 PM
23. ### Question about proper test

Respected experts! I have a table with different aminoacids in rows and different species in columns. Every cell contains relative amount of current...

• Replies: 0
• Views: 1,572
11-12-2011, 02:52 AM
24. ### Event study analysis significance tests

Dear all This is my first post in the forum. I'm sorry if this question already came up, I used the search function but did not find anything. I...

• Replies: 0
• Views: 1,613
08-28-2015, 04:14 AM
25. ### Repeated Measures ANOVA Options?

I was planning on running a repeated measures ANOVA but found these issues with my data. The assumption of sphericity was violated as assessed...

• Replies: 4
• Views: 1,489
04-30-2013, 06:38 PM
26. ### Which ANOVA?

I trying to decide the best statistical test to use for a survey. The RQ is related to employer acceptance of various MBA degrees. The sample is...

• Replies: 1
• Views: 964
05-01-2013, 10:00 PM
27. ### Is this variable ordinal or categorical - which test?

Hi, I'm not sure if this variable classifies as an ordinal or categorical DV, due to this issue I'm havign and therefore, I'm unsure which stats...

• Replies: 3
• Views: 1,921
08-29-2014, 11:22 AM
28. ### Help needed to check statistics in thesis

I would really need someone to check my stats work for my thesis, as I am not entirely sure about what procedures I carried out. Quick overview of...

• Replies: 0
• Views: 997
06-20-2015, 10:02 AM
29. ### correlation coefficient

Need quick help... A researcher investigated the relationship of age and ankle strength. She found the correlation coefficient to be -.85. What...

• Replies: 5
• Views: 3,195
02-14-2012, 01:15 AM
30. ### probability formula

Hello, I would like to know the formula that would allow me to do the following; Assume; 1. 200 total events occur in 100 days (ie; 2 events per...

• Replies: 5
• Views: 1,398
01-16-2016, 02:47 PM
31. ### Cluster analysis - using statistiXL package for excel - how to determine a cluster

Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

• Replies: 2
• Views: 2,128
04-08-2013, 06:33 PM
32. ### Mixed model for two way ANOVA with SPSS

Hi, I have to do a two way anova repeated measures (one between factor with 2 levels: control and treated, one within factor with 3 levels: time...

• Replies: 0
• Views: 952
02-21-2015, 03:08 PM
33. ### 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: 3,019
06-21-2010, 11:54 PM
34. ### Obtaining Residuals in Chi Square Goodness of Fit

Another question re: goodness of fit testing, Is the procedure for obtaining standardized residuals the same ? The PhD student who leads the...

• Replies: 4
• Views: 4,572
04-28-2009, 11:01 AM
35. ### eviews question

Hello everybody, I need fto find evieuws somewhere on the web but i can't find it. Doesn anyone know where i can download for no charge? Thx for...

• Replies: 3
• Views: 5,607
09-28-2011, 06:34 AM
36. ### Conjoint analysis - orthogonal design

Hi I'm setting up a conjoint experiment. It will be a traditional full profile setup with 7 factors (5 factors have 2 levels, 2 factors have 3...

• Replies: 0
• Views: 5,883
12-03-2010, 09:46 AM
37. ### Gamma vs. Tau's b

Hi everyone I am studying political science, and we have during our classes of statistical research learned to use gamma for ordinal variables....

• Replies: 2
• Views: 1,556
06-15-2013, 05:13 AM
38. ### Likert scale analysis - grouped items

Good morning, I am currently analyzing a Likert scale questionnaire (5 points) of 28 items. The items of the questionnaire are grouped into...

• Replies: 0
• Views: 1,290
08-05-2013, 04:02 PM
39. ### different test for normality

Hi, Can anybody give a brief description for different non-parametric tests of distributions (like normality)? what are differences between...

• Replies: 3
• Views: 2,280
05-05-2013, 12:58 PM
40. ### Assumption of variables for Factor Analysis

Hi, In wikipedia page of Factor Analysis it states:Suppose we have a set of p observable random variables. Does it mean that we can use this method...

• Replies: 2
• Views: 1,390
01-13-2013, 03:04 PM
41. ### Trend Stationarity vs. Level Stationarity

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

• Replies: 0
• Views: 2,359
03-14-2013, 10:18 PM
42. ### 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: 2,792
03-12-2013, 02:17 AM
43. ### 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: 6,151
02-18-2013, 12:52 PM
44. ### How to calculate conditional density

Hi, If we have a bivariate Gaussian dist as N(m, a). m=mean and a=variance. how can we find f(x|y) in terms of m and a? Thanks

• Replies: 1
• Views: 1,243
BGM
02-07-2014, 12:35 AM
45. ### What are age effects?

Any thoughts? I've been asked to find these with some data I've been working with.

• Replies: 2
• Views: 2,360
11-18-2008, 10:33 AM
46. ### Websites on designing scientific posters

I have to do a poster presentation in a few weeks and I'm looking for some good sites that might give some advice on designing scientific posters,...

• Replies: 5
• Views: 16,151
05-11-2010, 02:08 AM
47. ### methods for selection a subset of population to measure biomarkers

Hi! In a quite large time-to-event clinical trial project, the population is very large (more than 1,000 people). I want to measure the subjects'...

• Replies: 1
• Views: 923
07-20-2015, 03:09 PM
48. ### Paired t-test VS Anova

I'm reading an article which is comparing the effects of three variables. But the authors used several paired t-tests to measure two variables at a...

• Replies: 2
• Views: 3,305
06-22-2012, 06:37 PM
49. ### How to obtain standard deviation of replicate experiments?

I have been searching in books, fora and articles but I can't seem to find a clear cut answer to the following question: I ran two experiments...

• Replies: 0
• Views: 2,591
01-20-2017, 03:40 AM
50. ### Subject responses in multiple period experiment

Hello Everybody, In an experiment, players play a game for 30 rounds. In each round, they choose either good A or good B. In various treatments,...

• Replies: 0
• Views: 1,012
09-02-2013, 01:57 PM
51. ### How many people are needed for a valid sample?

Question I have to answer: In order to collect a survey of opinions, I would like to take a sample of a city with a population of 600,000 people....

• Replies: 0
• Views: 2,732
10-07-2011, 06:07 PM
52. ### Analysis for MSc - multiple regression?

Hi everyone, I hope someone wouldn't mind checking I am on the right track with the stats for my MSc project (recovery times in reptiles...

• Replies: 1
• Views: 1,636
08-08-2011, 11:38 AM
53. ### homogenity of variance

I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

• Replies: 3
• Views: 4,300
09-22-2011, 02:58 PM
54. ### Autocorrelated measurements with autocorrelated errors, covariance term

Dear all interested stats people, I encountered the following situation for error propagation of a time series. 1.) Given a time series...

• Replies: 0
• Views: 1,508
08-11-2012, 07:43 AM

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