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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: 18,790
10-11-2014, 12:02 PM
1. ### Chi sqared test or fisher exact test?

Hi, I am doind research on different treatments to a disease. I broke down the categories into different age groups, i.e. 5-10,11-15,16-20 etc. and...

• Replies: 4
• Views: 2,250
04-10-2012, 07:13 PM
2. ### Analysis of Covariance

Hi everyone, I would like to ask a question about the type of scale (e.g. categorical , continues variable) that should be use as a covariate. I...

• Replies: 0
• Views: 1,032
04-10-2012, 10:08 AM
3. ### Counter-intuitive results with Bold-Brunell panel data estimator (DV-INDEX)

Hi All, I am doing Brunell-Bond panel data analysis and the results seem completely counter-intuitive. The DV is a food prices index - and so if...

• Replies: 7
• Views: 1,968
04-09-2012, 03:23 PM
4. ### Question about missing values in panel data

Hi All, I have several countries (out of all the list) for which 1 or 2 variables (out of 9-10) are missing for all 6 years considered. Is there...

• Replies: 0
• Views: 1,811
04-08-2012, 07:41 AM
5. ### Comparing responses on 5-point scale

Hi All, I have administered a 5-point scale on my participants which they answered on 10 value items- can I assume this is interval data? I have...

• Replies: 3
• Views: 2,437
04-05-2012, 03:26 AM
6. ### Hypothesis testing with Maximum A Posteriori (MAP) estimators

Hi, Does anyone know of any work on hypothesis testing with MAP estimators? The likelihood ratio test is based on asymptotic distributions, so I...

• Replies: 0
• Views: 1,727
cfp
04-04-2012, 05:46 PM
7. ### Simultaneous M-estimator of location and scale

Hi I am having trouble with the simultaneous estimation of the M-estimator for location and scale. I am trying to implement a iterative weighted...

• Replies: 0
• Views: 1,746
04-03-2012, 12:53 PM
8. ### 10 point scale and central limit theorem

I want to do a comparative analysis between two means of groups. I want to hear opinions on two things. 1. I asked participants to rate me...

• Replies: 6
• Views: 2,718
04-03-2012, 05:20 AM
9. ### Normal distribution...

Hi. In many examples I have seen that service time for passengers (time between 2 bus arrivals) is modeled by using normal distribution. As usually...

• Replies: 0
• Views: 1,646
04-03-2012, 04:32 AM
10. ### Outliers (Multiple outlier detection - PROC ROBUSTREG)

Can anybody describe to me (as simply as possible) what M-estimation and LTS estimation are? I'm trying to learn more about outlier detection...

• Replies: 0
• Views: 2,536
04-02-2012, 12:49 PM
11. ### Wilk s theorem and LR test

Hello, I have first posted the following in the "Statistics help" section, but it might be that it is better to post it here. I have some...

• Replies: 2
• Views: 3,672
03-30-2012, 09:56 AM
12. ### Using variations of ANCOVA for non-normal distributions

My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is...

• Replies: 0
• Views: 969
03-29-2012, 05:15 PM
13. ### Using variations of ANCOVA for non-normal distributions

My first question here, hope to be relevant to the community. Im into CS course and a total rookie on statistics, so let me know if more detail is...

• Replies: 0
• Views: 1,696
03-29-2012, 04:28 PM
14. ### Is Count/Expected Count in Chi Square a good descriptive measure?

I want to simplify these outcomes. Can I simply divide the observed count / expected count to get a sort of 'odds ratio'? I am doing this with +3...

• Replies: 2
• Views: 1,476
03-29-2012, 01:27 PM
15. ### im i doing this right?

Help PLEASE!!!! I'm attempting to do a stats assignment atm and I'm hoping to get some feedback on how im doing so far. the assignment is this: ...

• Replies: 9
• Views: 2,565
03-29-2012, 01:17 PM
16. ### ANOVA with subject id's as variables?

Hi everybody, I work in sleep research and it is usually of interest to us to compare variables between different sleep stages (wakefulness, N1,...

• Replies: 6
• Views: 2,559
03-27-2012, 04:01 PM
17. ### calculating d'

I am working on a project using a 3AFC test and am unsure about how to calculate d' in that scenario. Am I still just using Hits/False Alarms as if...

• Replies: 1
• Views: 1,461
03-27-2012, 01:16 PM

Hi, I recently ran several focus groups where particpants were asked to rank a series of 18 photos from most natural to most unnatural. I then gav...

• Replies: 0
• Views: 977
03-27-2012, 09:23 AM
19. ### 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: 1,754
03-26-2012, 09:57 PM
20. ### I need some help...

Hi, I am a researcher studying language-editing services and I just finished conducting an analysis of language-editing models. Basically, I am...

• Replies: 1
• Views: 1,321
03-26-2012, 02:13 PM
21. ### Chance performance in a binary choice task

Hello! I am analyzing data in which participants have answered 80 binary-choice questions; one option is correct and one option is incorrect. Is...

• Replies: 1
• Views: 2,285
BGM
03-26-2012, 11:34 AM
22. ### Help deciding which analysis to run

Hi all, I'm doing a study and having trouble deciding on the appropriate analysis. I'll give a simple example of what I'm trying to do and any help...

• Replies: 0
• Views: 959
03-23-2012, 02:50 PM
23. ### Data collection???

First off apologies if I should have just posted this in my other thread. I am working with some cycle hire data from the Barclays Bicycle Hire...

• Replies: 2
• Views: 1,488
03-22-2012, 07:52 PM
24. ### Is MANOVA the most appropriate test?

I'm interested in how microphone types affect the result of acoustic analysis measures. I'm looking for the most appropriate statistical test to...

• Replies: 2
• Views: 2,006
03-22-2012, 12:49 PM
25. ### Multiple likert scales- Rankig eac

Removed as posted in wrong area.

• Replies: 0
• Views: 1,857
03-22-2012, 11:52 AM
26. ### Unbalanced sample size

Hello I have a question... what can an unbalanced sample cause ? For example, I have 2 groups, and I want to either use a t-test, or some...

• Replies: 1
• Views: 2,732
03-22-2012, 11:12 AM
27. ### Missing Data

I used an original survey form to collect data and afterwards realized that the final copy of that survey included a question that was not on the...

• Replies: 6
• Views: 2,034
03-21-2012, 09:22 PM
28. ### 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: 7,414
03-21-2012, 06:20 PM
29. ### What's the null hypothesis here.

I need to do a hypothesis test on the mean of bicycle hire lengths in London, the expectation is that the mean hire shouldn't exceed 60 minutes. ...

• Replies: 5
• Views: 2,900
03-21-2012, 02:30 PM
30. ### Variance of combined clusters

During the process of cluster analysis, when two clusters with estimated variance {s}_{1}^{2} and {s}_{2}^{2} what is the estimated variance of the...

• Replies: 0
• Views: 940
03-20-2012, 12:44 AM
31. ### When homogeniety of regression slopes (for ANCOVA) is significant.

HI, I have conducted an ANCOVA and have a significant interaction when testing the homogeniety of regression slopes assumption. My IV is Group...

• Replies: 0
• Views: 1,336
03-19-2012, 11:45 PM
32. ### Variance sum law proof

Hey guys, I was wondering if something could get me started on a proof for the variance sum law. For the sake of clarification, I'm referring...

• Replies: 10
• Views: 11,294
03-17-2012, 10:10 PM
33. ### simple experiment - did I pick the right test?

Hello, I hava a quick question: I formulated the H0 and H1 (the manipulated variable affected the results), picked the "between participants...

• Replies: 1
• Views: 1,205
03-16-2012, 04:42 PM
34. ### MANOVA interpretation

Hello Everyone, I have a couple questions regarding the interpretation & reporting of a recent MANOVA that I ran. A little background on this...

• Replies: 0
• Views: 2,886
03-16-2012, 04:13 PM
35. ### Random effects estimator

Hi, I don't quite understand what a random effects estimator actually does... I have individual data for 2 (not adjacent) years: Some...

• Replies: 0
• Views: 1,399
03-14-2012, 03:28 AM
36. ### Curve parameters

Hi all, I have a curve with an intercept, slope, and quadratic factor. Now, I would like a draw a curve that is one standard deviation above this...

• Replies: 8
• Views: 2,777
03-13-2012, 03:10 PM
37. ### Mass significance – information criterion

In search for the ’best’ linear regression model with 10 potential predictors I calculated the Schwarz Bayesian Criterion (SBC) for every possible...

• Replies: 0
• Views: 50,219
03-13-2012, 04:25 AM
38. ### Algebra of random variables?

Hi Guys, I'm in the field now, so I'm not online much. However I do have a burning question. Does anyone have any book suggestions for me that...

• Replies: 2
• Views: 2,483
03-12-2012, 11:33 AM
39. ### Need help on the suitable design selection

hi guys... i have been given a set of data with 5 input factors and 1 output. among the inputs, 3 are in numerical form and another 2 are in...

• Replies: 0
• Views: 2,432
03-11-2012, 10:48 AM
40. ### Panel Data - Pooled OLS vs Fixed Effects vs Random Effects

Hi forummers, I am a finance PhD student and am currently undertaking some statistical analysis of bankruptcy risk. I have data on roughly 500...

• Replies: 2
• Views: 78,979
03-09-2012, 01:54 PM
41. ### Event Study Methodology - Event Window

Hi, I am currently beginning an event study on the effect of the Fukushima crisis on U.S. electrical utility companies. I am completely new to...

• Replies: 0
• Views: 2,783
03-09-2012, 07:52 AM
42. ### Likert Scale

Hi! Can you help me with my stat research problem? what is the difference between 3-point likert and 5-point likert scale? which is better to use and...

• Replies: 6
• Views: 17,345
03-08-2012, 05:37 AM
43. ### Sampling problems

Hi, I need to sample randomly my dataset for 1000 times. The sample need to be the 80%. I know how to do that, my problem is that not only I need...

• Replies: 2
• Views: 1,999
03-07-2012, 07:05 PM
44. ### Independence between errors assumption

Hi all, thank you How do i check independence between errors graphically? Did i have to make a Residual vs factor plot? Thanks Thanks

• Replies: 0
• Views: 1,457
03-07-2012, 06:23 PM
45. ### Sampling frequency

Hello all, I am a doctor in intensive care. Part of my work includes undertaking clinical research. I have a question for statisticians /...

• Replies: 1
• Views: 1,395
03-07-2012, 04:57 PM
46. ### Convergent and Divergent Validity

Is it possible to make a multimethod-multitrait matrix of tests with different number of items? example: Test 1 consists of 5 categories with 24...

• Replies: 7
• Views: 3,612
03-06-2012, 10:30 AM
47. ### Post hoc test for the multisample median test

Hi all, I have a question about an investigation that i have developed. Specifically, i was comparing abundance of flyes among different...

• Replies: 0
• Views: 3,273
03-05-2012, 08:27 PM
48. ### a data modeling question

Just had a job interview with a bank. They asked me the following questions: 1. Their credit card offers reward points. They want to predict...

• Replies: 1
• Views: 1,685
03-05-2012, 04:26 AM
49. ### Correlation coefficient in two groups separately and the collapsed across groups

Hi, I'm having trouble interpreting the results of a test of bivariate correlation. I am computing Pearson's r in a group of 400 as a whole,...

• Replies: 2
• Views: 2,133
03-03-2012, 12:26 PM
50. ### Multiple Imputation of Pre-Composite Scores

I'm running the analysis on a study that used questionnaires. Several items on the questionnaires can be added to come up with composite scores of a...

• Replies: 4
• Views: 3,266
03-02-2012, 06:33 PM
51. ### How can I analyse this data?

Hi guys, I'm currently doing research for my dissertation. Background info: Generally speaking, I am studying perceptions of different factors...

• Replies: 1
• Views: 1,287
03-02-2012, 04:44 PM
52. ### Correlation

Hi! I'm currently working on a research..but I'm having problems with correlation. I want to correlate a test with 5 general scales to a test with...

• Replies: 2
• Views: 2,140
03-02-2012, 11:52 AM
53. ### Using a likelihood to fit a model

Dear all, I am doing some research into mixture modelling. I have determined (albeit crudely) that a three component mixture model is my best...

• Replies: 0
• Views: 1,477
02-29-2012, 11:57 AM
54. ### 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: 3,874
02-29-2012, 08:50 AM

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