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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: 18,723
10-11-2014, 12:02 PM
1. ### 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: 6,136
02-18-2013, 12:52 PM
2. ### Was thinking Kendall's Tau but...(correlation)

Hey guys, I was wondering if you could help me out with this: I have seven sites along the west coast each with two types of data and several...

• Replies: 16
• Views: 6,119
08-15-2011, 08:06 PM
3. ### Census & tests for significance?

I'm having trouble understanding when I need to test for signficant differences when dealing with a census (i.e. every member of a population). My...

• Replies: 6
• Views: 6,107
11-12-2010, 02:09 PM
4. ### Appropriate method for research model

Hi guys! Please i need your advice! I have developed a model about some factors that influence the desire of members to share information is...

• Replies: 16
• Views: 6,105
07-26-2011, 10:11 PM
5. ### What to do if sample size is too big? (ttest)

So I'm running ttests for a descriptive statistic table and all my results are significant, but I"m concerned that the sample size is too big 3,880...

• Replies: 5
• Views: 6,105
02-01-2014, 05:47 PM
6. ### Monte Carlo simulation: how many runs?

Hi, Most papers I read related to Monte Carlo (MC) simulation method say that there is no rule on the minimum number of runs required. However, in...

• Replies: 12
• Views: 6,102
BGM
04-07-2015, 06:21 AM
7. ### How to calculate variance on pooled data

I have an array of pairs. Each pair represents a "bin" in a range. Each pair stores a sum and a count. Data is added to a pair/bin by adding the...

• Replies: 2
• Views: 6,078
05-30-2010, 09:49 PM
8. ### Factorial ANOVA

I am reading a paper looking at the effect of interventions (an aerobic exercise regime group, a stretching exercise regime group, plus a contol...

• Replies: 3
• Views: 6,061
10-12-2011, 02:49 AM
9. ### Test statistic concerning mean comparison of UNKOWN sample distributions?

Hello, all. I'm far from a statistics expert, so excuse me for any inaccuracy that I might say. I'm trying to compare two sample distributions...

• Replies: 3
• Views: 6,047
10-14-2011, 09:03 AM
10. ### Is Post hoc necessary in a Mixed ANOVA 2x2

Hi, I have 2 groups evaluated at time 1 and 2. I used Mixed ANOVA 2x2 but now I'm not sure if I have to do post hoc test. I have read some papers...

• Replies: 1
• Views: 6,047
01-10-2011, 02:55 AM
11. ### results SIMPER dissimilarity for species with equal mean abundance

Dear all, I am doing my master thesis on subtidal algae species in the north Atlantic. Herefore I have presence-absence data of different algae...

• Replies: 1
• Views: 6,038
05-04-2012, 09:08 PM
12. ### how to find the UMVUE of the location parameter under t distribution

f(x;\theta)={{\Gamma({{v+1}\over2})}\over{\Gamma({v\over2})\sqrt{\pi v}}}\Big(1+\frac{(x-\theta)^2}{v}\Big)^{-\frac{v+1}{2}} , v>=3 i have no...

• Replies: 7
• Views: 5,977
04-04-2010, 09:05 AM
13. ### From OLS to Box Cox to ?

Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

• Replies: 4
• Views: 5,970
08-31-2008, 02:58 PM
14. ### Conjoint analysis

....i need some insight please... those familiar with conjoint, though i don't have any statistical package to run on it, so my plan was to do...

• Replies: 4
• Views: 5,924
03-16-2009, 05:52 AM
15. ### 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: 5,917
02-17-2011, 07:54 AM
16. ### Raw Data vs Frequency Distribution

Hi, I am new here, please discuss this given below. “Why an average computed from a frequency distribution is not exactly the same as...

• Replies: 6
• Views: 5,908
05-11-2015, 07:48 AM
17. ### pre-test post-test difficulty

Hi everyone, I'm new to the forum, but I'm definitely glad it's here. I have a difficult research design problem / stats problem that I was...

• Replies: 1
• Views: 5,903
09-09-2008, 10:02 PM
18. ### 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: 5,875
12-03-2010, 09:46 AM
19. ### t-tests after three-way ANOVA?

Hi all, I've just run a three-way ANOVA on my data (3 IVs, 1 DV). I've got some main effects, as well as a three-way interaction effect. Am I...

• Replies: 3
• Views: 5,875
03-04-2011, 05:20 PM
20. ### Manova outlier cutoff

I have been reading that Manova is very sensitive to outliers, particularly for small groups. One text I read suggests using 3.5 SD as a cutoff for...

• Replies: 5
• Views: 5,851
12-04-2008, 12:22 PM
21. ### which statistical test to use in spss

I have a variable (dependent) and five independent variables. How can I test if the five variables affect the dependent variable? Which test should...

• Replies: 1
• Views: 5,836
03-03-2011, 08:56 PM
22. ### Project ideas for Statistical quality control

I was hoping I could get some beneficial input as to what problem I should address for my statistical quality control project. As of now we have...

• Replies: 0
• Views: 5,835
03-01-2014, 09:38 PM
23. ### Calculating and interpreting Spearman's Rank Correlation...

Hi. I am completing an undergraduate research project and am having a bit of trouble completing the statistical analysis. I'll briefly run through...

• Replies: 1
• Views: 5,825
12-04-2010, 04:15 AM
24. ### Age-Matching Groups Who Differ on Age

I have two groups of children, A and B. Group A is the treatment group and has an age range of 5-7 years old. Group B is the control group and has an...

• Replies: 4
• Views: 5,823
11-06-2008, 02:17 PM
25. ### KS or Wilcoxon?

I have some survey data which I want to analyse using non-parametric test. It is a single sample (approx. 100) It is ordinal - likert scale e.g....

• Replies: 4
• Views: 5,823
04-21-2011, 01:37 PM
26. ### Algebra, two-sample t-statistic, variance

• Replies: 20
• Views: 5,805
08-13-2012, 12:31 AM
27. ### ANOVA weighted means?

Hi Chaps, I am trying to run a comparison between two groups - patients and staff - ratings of the quality of life on a ward. Simple enough,...

• Replies: 3
• Views: 5,790
06-05-2009, 12:15 PM
28. ### Summary variable for adversities

Fellow members, I'm doing research currently on the effects of childhood adversities on development of the autonomic nervous system. I'm a little...

• Replies: 8
• Views: 5,790
10-07-2010, 12:30 AM
29. ### Cut-off Points in Linear Discriminant Analysis

Everyone can discuss about the cut-off points in linear discriminant analysis. I know how to calculate it when there are 2 groups. But, more than 2...

• Replies: 2
• Views: 5,774
09-16-2008, 02:22 AM
30. ### Advice for analyzing a small sample

I am currently working on my doctoral thesis in computer science and I have data from an experiment that I want to analyze, but I don't want to run...

• Replies: 5
• Views: 5,742
02-18-2010, 10:39 PM

I have just obtained the output for a one way repeated measures ANOVA and have read that it is useful to report the size of the effect using omega...

• Replies: 0
• Views: 5,736
08-20-2009, 03:28 PM
32. ### Skewed data - what test should I use

Research question: Does wearing a helmet affect head repositioning error in a group of normal participants compared to not wearing a helmet? 3...

• Replies: 3
• Views: 5,732
08-04-2013, 07:08 PM
33. ### Significance in a Yes/No question

Hi, So I'm working on a research project that is looking into whether there's a statistically significant difference between pilots in their...

• Replies: 2
• Views: 5,726
06-22-2011, 02:01 PM
34. ### rxc contingency table: comparison between cells?

Hello.I'm a dental student. I'm studying about how restorative methods are going to affect fracture pattern(fra.(fp)) of teeth. As a result I have a...

• Replies: 7
• Views: 5,724
06-26-2010, 04:52 AM
35. ### Coding Data

I am examining the relationship between employee level of education and the severity of their disciplinary offenses. I coded education...

• Replies: 21
• Views: 5,719
08-26-2011, 09:30 AM
36. ### ranking and meta-analysis

Hi everybody, I have a problem regarding some statistical evaluations. I want to conduct a meta-analysis of several papers. The goal of the...

• Replies: 2
• Views: 5,710
11-11-2010, 03:02 AM
37. ### Application of Significance Testing

SAMPLE SIZE: 518 in each city QUESTION: Likeness to have Coke after dinner. Positive Response to the Question: 320 in each city ...

• Replies: 6
• Views: 5,698
12-08-2010, 12:54 AM
38. ### Are there any post hoc analyses for Chi Square data?

Hi, I've got some Chi square results that I would like to analyze post hoc. Any ideas? I've got categorical data. Kind regards Brionny

• Replies: 2
• Views: 5,689
03-10-2009, 04:57 PM
39. ### Question about ANOVA alternatives for non-normally distributed data

I am trying to analyze data from an experiment where participants take two reading tests, to compare the effectiveness of two different dictionaries...

• Replies: 0
• Views: 5,688
11-08-2010, 08:58 AM
40. ### Individual level moderator in HLM? Need help, please!

Hi, I'm working on a paper about the influence of a group-level variable on a individual-level variable and want to add an individual-level...

• Replies: 2
• Views: 5,683
06-29-2011, 07:23 AM
41. ### bias of the coefficient of variation

Is the coefficient of variation biased? How would you compute the bias of CV? Can I write E(sigma_hat/|mu_hat|) = E(sigma_hat)E(1/|mu_hat|)+ ...

• Replies: 4
• Views: 5,678
03-30-2011, 02:38 PM
42. ### how to using mann kendall test?

hi everyone, i am a new member of this forum and i'm not statistician. my english is not good, sorry for language. i'm having trouble with the...

• Replies: 2
• Views: 5,678
05-20-2013, 06:14 AM
43. ### Paired t test or repeated anova

I have a two groups design (treatment vs control) and pre and post test. I've looked at a paired t-test to see if there was a difference, and...

• Replies: 2
• Views: 5,673
08-02-2011, 08:09 PM
44. ### Random Variables and Correlation

I claim that if x is a normal distributed random variable, and y is a uniformly distributed random variable then x and y cannot have a correlation of...

• Replies: 11
• Views: 5,669
11-20-2008, 03:47 PM
45. ### Representing a distance measure with math equation

I'm working on presenting a distance measure at a conference but don't have a publication quality math formula for representing what I'm doing in R. ...

• Replies: 26
• Views: 5,653
11-11-2013, 04:54 PM
46. ### Correlation or Difference?

hello everybody, i have a question about which method would be more appropriate. I have a 4 point ordinal dependent variable. I also have 3...

• Replies: 2
• Views: 5,618
02-26-2011, 11:41 AM
47. ### Distribution of p values

Hello, I need some help understanding the last stage of a proof. I am trying to understand the proof that say that the distribution of the P...

• Replies: 4
• Views: 5,612
08-01-2012, 09:11 AM
48. ### difference between mean ranks

Hello! I asked respondents to rank 13 motivation factors in order of importance (from the most important to the least important). Now, I would...

• Replies: 1
• Views: 5,608
08-06-2010, 08:25 AM
49. ### Cross-estimating the independent variables to exclude outliers

I am working on a dataset where some of the independent observations have measurement issues (i.e. mixed feet and metric). I'm considering...

• Replies: 0
• Views: 5,608
03-08-2014, 08:49 AM
50. ### how to measure love/hate

Any idea about how can one develop a scale (Likert) to measure concepts like love, liking, hate etc towards some prominent leaders from certain...

• Replies: 4
• Views: 5,606
04-13-2010, 01:27 PM
51. ### Simple Random Sampling - Variance Of An Estimator

I am having problems with the following problem (from Cochran's "Sampling Techniques", 3rd edition, p.49, question 2.19): Suppose in a population...

• Replies: 5
• Views: 5,606
05-16-2011, 09:56 AM
52. ### 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: 5,593
09-28-2011, 06:34 AM
53. ### paired T-test or anova

Dear all just a quick simple one this time. if i had two sets of runners (in a race) for example and these two groups were linked only by the fact...

• Replies: 7
• Views: 5,591
08-23-2010, 10:53 PM
54. ### Two-tail test

For 1996, the U.S. Department of Agriculture has estimated that American consumers would have eaten, on average, 2.6 pounds of cottage cheese...

• Replies: 1
• Views: 5,564
03-24-2006, 03:02 PM
55. ### Modelling the yield from sports bets - Potentially using a mixture of distributions?

Hello all, A friend of mine asked me to analyze some data which comes from placing bets on sports. Having read quite a few threads and seeing how...

• Replies: 11
• Views: 5,562
04-01-2011, 03:35 PM
56. ### Excess Return - Benchmark Returns

Well, I am new in the field of business research with very little stastics knowledge. Problem is that I have to calculate <excess return> which...

• Replies: 3
• Views: 5,561
04-06-2011, 08:11 PM

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