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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: 18,682
10-11-2014, 12:02 PM
1. ### How do you convert yearly and period CPI to that of a rolling basis?

Hi Guys, I am doing research and currently I am trying to utilize Consumer Price Index data. I have two sets of consumer price data, one that...

• Replies: 0
• Views: 1,013
04-23-2012, 04:35 AM
2. ### Accelerated Bootstrap - mediation

Howdy! :tup: Can anyone explain accelerated bootstrap to me? I've got it reported in a research report and I can't really figure it out. ...

• Replies: 2
• Views: 4,992
08-20-2011, 04:15 PM
3. ### Power

Hi there, I need some help getting my head around this power concept. If there's a small but important effect, should you try and find it...

• Replies: 9
• Views: 2,409
08-25-2011, 08:35 PM

A company is interested in investing in companies in Hong Kong. They have access to large dataset on the rate of return on assets (expressed in...

• Replies: 1
• Views: 2,213
03-27-2011, 01:14 PM
5. ### help me, i need some ideas for my dissertation

Okay i am going to conduct a regression analysis to explain the variation in patents per capita across regions in China. I have done some...

• Replies: 1
• Views: 2,397
03-30-2011, 06:24 PM
6. ### Rotation in Principal Components Analysis

Hi, I was wondering if anybody could give me some general advice on a specific issue. Is it possible to orthogonally (varimax) rotate when...

• Replies: 7
• Views: 5,416
01-14-2014, 08:18 AM
7. ### Which statistical test to use?

Hi guys, I am posting to gain a bit of advice on which statistical test to use for our current research study. We are due to meet with our...

• Replies: 1
• Views: 1,115
06-13-2014, 10:24 AM
8. ### Need help on normalizing data

I have very limited knowledge on statistics, but I need to approach the following question, can any expert here show how to approach it? I have 2...

• Replies: 3
• Views: 5,145
12-15-2011, 04:17 PM
9. ### what test to do?

Hi Would be grateful for a little guidance. I have a set of data with a mix of continous and categorical data I am trying to see if there is...

• Replies: 1
• Views: 1,968
05-24-2009, 03:05 PM
10. ### How to determine margin of error & power of a survey after completion of data collect

We have conducted a telephone interview survey with a sample size nearer to nationally representative, then conducted the interview by calling...

• Replies: 0
• Views: 970
06-01-2014, 11:25 PM
11. ### statistical test confius

hii... any one need to help me... currently im doing research about pollution.. can any one suggest what test can i do since i using questinnaire...

• Replies: 3
• Views: 1,347
11-06-2015, 06:33 PM
12. ### Difference in coefficients between regressions?

Hi - I'm looking for a way to test whether the beta coefficients are significantly different between two regression analyses. For example:...

• Replies: 1
• Views: 10,266
03-25-2009, 11:55 PM
13. ### Help with choosing statistics

Hi! Stumbled over this forum recently, there's so much knowledge here I could just sit and read and read. Anyway, I'm not the strongest in stats so I...

• Replies: 22
• Views: 4,514
11-22-2011, 12:09 AM
14. ### HELP: Using Data on Different Spatial Scales for Econometric Regressions

*Background: Using a Production Function in form of Autoregressive Regression Model for Regional Perfomance* Hi, This question is more of a...

• Replies: 0
• Views: 1,467
02-03-2017, 03:06 AM
15. ### Relative aggression index - what's the best way to compose it?

I study the international conflicts, and there is a dataset where all the official actions of one state towards another are registered. They are of...

• Replies: 0
• Views: 1,630
09-22-2014, 09:23 AM
16. ### Paramedic Research - Need help!

Hello all, I have come across your forum after trying to source some statistic knowledge. I am currently planning a research project which I am...

• Replies: 6
• Views: 1,297
12-08-2013, 11:26 AM
17. ### Using a t test not giving me what I want

Good afternoon all, I'm writing a procedure to simply identify if 2 values are significantly different enough to update the procedure. As an...

• Replies: 11
• Views: 1,669
08-28-2013, 06:27 AM
18. ### KL Divergence - What does the double bar notation mean?

Hi, Kullback-Leibler divergence tends to be written as D_KL(P||Q), where P is a true probability distribution of random variable x and Q is a...

• Replies: 0
• Views: 1,542
07-31-2012, 09:41 AM
19. ### How to calculate significant differences in correlation using stata/spss

Hello, This is probably a fairly simple question but I don't know to handle it properly. I have monthly data of 2 categories. Each category...

• Replies: 1
• Views: 780
05-23-2015, 03:47 AM
20. ### Help with t-test data analysis

Hi everyone, I am a bit lost when it comes to stats, having only had a tiny amount of it so far. In my biology class we are writing a paper on if...

• Replies: 3
• Views: 3,220
04-05-2011, 05:19 AM
21. ### Should I be using a MANOVA?

Hi all, I apologise in advance if I explain this poorly - this is all somewhat new to me. I'm currently doing a small piece of classroom research...

• Replies: 7
• Views: 1,218
12-29-2015, 06:40 AM
22. ### 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: 1,486
02-12-2013, 04:52 PM
23. ### Sample size | Johnson SB distribution

I have some statistical notions but from one day to the other i was asked to do an analysis that i hope you guys can help me with, since i have no...

• Replies: 1
• Views: 2,340
01-07-2014, 09:55 AM
24. ### Kaplan Meier and Log Rank

Hi all, I am doing cognitive testing and the subjects have 20 possible trials to reach criterion (90% accuracy). In my spreadsheet, I have it laid...

• Replies: 0
• Views: 976
12-05-2013, 09:41 AM
25. ### Is Wilcoxon Sign Rank the appropriate test?

Hi - could anyone help me with this please? I am trying to choose the best statistical test for a problem I have - I am looking at rainfall...

• Replies: 1
• Views: 1,236
12-20-2013, 04:39 PM
26. ### test which of two models is better predictor -- but the two are correlated with each

Dear All -- Can anyone please please help me? I have a dichotomous dependent variable Y There are two alternative models for predicting Y The...

• Replies: 6
• Views: 3,480
09-02-2011, 06:46 PM
27. ### Repeated measure project.....which test?

I am doing a project where I give subjects nicotine gum to chew for 30 minutes and then test them. They come in for a total of 2 visits. They either...

• Replies: 0
• Views: 1,700
12-04-2010, 04:43 PM
28. ### Significance test for 13 dichotomous DVs?

I am studying unprofessional conduct. I have every case of misconduct over a 5-year period. I am curious if misconduct varies by education level. ...

• Replies: 0
• Views: 1,252
02-18-2016, 12:34 PM
29. ### insufficient residual degrees of freedom

What should I do when my SPSS output cannot produce multivariate test statistics because of insufficient residual degrees of freedom, and therefore...

• Replies: 1
• Views: 7,350
03-21-2012, 06:20 PM
30. ### try this for kicks...

Hi everyone! First post for me. I think this might be a bit tricky, but i would really appreciate some help (go figure..). I recently got...

• Replies: 2
• Views: 1,992
06-12-2010, 03:04 AM
31. ### alternative to anova

What is an alternative statistical test to anova. I have a large varience between three groups (control and two experimental). How can I determine...

• Replies: 10
• Views: 5,457
12-16-2011, 09:43 PM
32. ### Spearman's Rank Correlation P value on Minitab

Hi there, im doing a project on the relationship between plant height and their nearest neighbour. As i couldn't normalise the data i've opted to use...

• Replies: 0
• Views: 3,841
02-29-2012, 08:50 AM
33. ### reliability and pilot testing...losing plot!

Hi All I have modified an exisiting survey, added more questions. I have two separate scaleswithin this measuring different constructs, the rest...

• Replies: 8
• Views: 3,469
12-08-2011, 03:19 PM
34. ### Seeking help for the interpretation of model fit indices

Hi everyone... Please help me with the following question I'm doing my research that one of it aims is to test the model fit of a particular model....

• Replies: 0
• Views: 1,014
08-16-2015, 07:25 AM
35. ### Repeated Measures ANOVA or Linear Mixed Effects?

Hey Statisticians! I have a bit of a conundrum. I have a 2x3 model with factors Drug (E0,E1) and Music (No Music 1, Music, No Music 2). I have...

• Replies: 0
• Views: 221
09-04-2017, 10:24 AM
36. ### which statistical test to use - Observed difference in outcome is due to chance?

Hi, I have results from two very sensitive but different lab test trying to find pathogen in a patient sample. For some patients, results from two...

• Replies: 12
• Views: 3,661
11-06-2016, 08:07 PM
37. ### interaction

I have found a model to be significant for the effect of 4 IVs (two continuous and two dichotomous) on a continuous DV but none of the IVs show...

• Replies: 2
• Views: 2,862
02-07-2011, 10:17 PM
38. ### How many subsamples from large sample should I draw?

Hi, I am working on an analysis where I compare 2 different samples, one Dutch and one US sample. The US sample is bigger than the Dutch sample...

• Replies: 3
• Views: 1,629
12-14-2012, 05:24 AM
39. ### Best method to analyze mediation and moderation with ordinal data?

Hello! I'm new here (and to statistics as well). I could use your advice about how to analyze the data for my master thesis. The first part of...

• Replies: 7
• Views: 6,331
05-24-2013, 11:26 AM
40. ### Ordinal data analysis and hypothesis testing

Hello, I have been working on a survey analysis and have to test hypothesis if the specified kind of software resulted in increased performance of...

• Replies: 3
• Views: 3,322
04-10-2013, 10:56 AM
41. ### 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: 3,091
05-27-2009, 08:39 PM
42. ### I'm working for the plaintiff

Plaintiff is Mike. Pat collected Mike's oil royalties for 16 years and won't disgorge them - he's ditched his bank records and won't make an...

• Replies: 4
• Views: 1,745
03-26-2012, 09:57 PM
43. ### Before/after surgery comparison

Hi! I am currently doing experiments on song birds looking at pre- and post surgery data. I have 10 male birds each singing at least 100 songs both...

• Replies: 7
• Views: 1,432
02-04-2014, 09:20 AM
44. ### Limit of standard normal CDF(x) as x goes to ∞?

Let N:\mathbb{R} \to be the CDF of the standard normal density function. I want to evaluate: \lim_{b\to 0^+} N(\frac{a}{b}). Clearly this is...

• Replies: 12
• Views: 95,025
10-18-2012, 09:39 AM
45. ### What are all the research areas with a core focus on time series applications?

I want to do an applied time series research paper outside of finance/economics. My question to you guys is what are all the areas where applied time...

• Replies: 0
• Views: 1,137
01-12-2013, 12:30 PM
46. ### Homogenity and Heterogenity

Hello everyone. I have read that Homogenity and Heterogenity are used for population that have/do not have accordingly the same variance σ^2. Does...

• Replies: 1
• Views: 2,689
05-08-2010, 01:09 AM
47. ### S.t.d Calculation of different populations

Hello. I have n different populations with their means and their standard deviations. All these different populations follow the Gaussian...

• Replies: 5
• Views: 3,219
05-18-2010, 08:36 AM
48. ### Hypotheses testing in CFA.

Hi, I am struggling to understand, how support/reject the hypotheses addressed by my research model. I have conducted a second order CFA and...

• Replies: 4
• Views: 1,475
04-24-2013, 03:27 PM
49. ### Discriminant validity issues. Can this be improved?

Hi, I have some issues with my discriminant validity, as some of the factor variance correlations are greater than the Average Variance Extracted....

• Replies: 0
• Views: 1,247
05-04-2013, 10:51 AM
50. ### Constucting ARMA realizations

Given estimates for the AR and MA coefficients for an ARMA(p,q) model with a non zero mean, how do I construct a realization of the time series? ...

• Replies: 0
• Views: 2,878
06-11-2008, 10:26 AM
51. ### Likelihood Ratio Test for general hypotheses

Hi, The original paper (Wilks, 1938) describing the Likelihood Ratio Test considers a null hypothesis stating that a subset of the parameters from...

• Replies: 2
• Views: 5,875
02-17-2011, 07:54 AM
52. ### How to Analyze this data?

OK…so I am having difficulty trying to decide exactly how best to analyze the following data. Specifically, I am trying to determine the possible...

• Replies: 7
• Views: 3,145
10-05-2011, 11:38 AM
53. ### Not sure what statistical test to use

Hello: I have a couple of questions regarding what statistical test I should choose. Any help on this would be greatly appreciated! Break down on...

• Replies: 0
• Views: 1,566
08-05-2015, 09:24 AM
54. ### help needed (PLEASE) on which statistical analysis to use

I am looking at the relationship between attachment in childhood and attachment in adult relationships. Attachment in childhood has been measured...

• Replies: 0
• Views: 1,340
11-22-2013, 03:17 PM
55. ### statistical inference in materials science

Hi all, I'm currently doing a quick study into a material where grain size could potentially affect a desired property Y, but I'm uncertain about...

• Replies: 0
• Views: 1,106
03-07-2017, 12:17 PM

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