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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: 18,669
10-11-2014, 12:02 PM
1. ### puzzling change in effect in multilevel linear regression; suppressor effect?

In my analysis of educational achievement of second generation migrants, I modelled the effect of mother's and father's education in two ways, which...

• Replies: 3
• Views: 4,436
09-09-2010, 05:56 AM
2. ### Question Regarding Results from Matched Pair T-Test versus Tamhane's Test

I have a group of data from a survey regarding attitudes. The data was collected pre and post intervention on a group of students. The data n is...

• Replies: 1
• Views: 4,475
09-07-2010, 10:44 AM
3. ### non-parametric 1-way anova, but samples not independent

Hi, I'm in a quandary. Samples that I wish to analyse are ordinal and should be treated as a matched (dependent) since they were drawn from a...

• Replies: 1
• Views: 4,239
09-07-2010, 07:27 AM
4. ### Does anybody have a calculus example for Bartlett and Levene tests?

Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

• Replies: 14
• Views: 6,404
09-07-2010, 05:59 AM
5. ### Combining outcome scores: standardising case and control data

Hi tehre, I have 2 separate tasks that I ask a group of individuals to complete, half the group are given a drug after the baseline measure is...

• Replies: 0
• Views: 3,833
09-05-2010, 08:02 PM
6. ### Comparing means from SAME sample

I've done an experiment with human participants, n=40, so it's a large sample n>=30 from a large population. Now I'm trying to understand the...

• Replies: 0
• Views: 3,612
09-01-2010, 01:35 PM
7. ### repeated measures MANOVA on mixed design

Hi folks, I have data from a drug study that I am trying to perform statistical analysis on, and am not sure if my approach is correct. I was...

• Replies: 0
• Views: 7,025
08-30-2010, 03:24 PM
8. ### Negative binomial regression / poisson regression

Does anyone have experience with STATA? and more specifically how to conduct a negative binomial regression in stata? My problem is that i dont...

• Replies: 2
• Views: 8,789
08-28-2010, 04:24 AM
9. ### Interpret statistical data - Relative risk, power, and significance?

"We estimated that a sample size of 1240 patients followed up for an average of 3 years would lead to detection of a 33% difference in the relative...

• Replies: 4
• Views: 6,246
08-28-2010, 03:53 AM
10. ### 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: 5,567
08-23-2010, 10:53 PM
11. ### Sample size calculation formulae

Sample size calculation formulae Can someone please let me know where I can find a suitable 'Sample Size calculation Formula'? A standard...

• Replies: 2
• Views: 3,683
08-21-2010, 11:38 AM
12. ### Suggest an Unbiased estimator for θ

Prove that the maximum of the random sample of size 'n' from uniform distribution over is a biased but a consistent estimator of θ. Suggest a n...

• Replies: 3
• Views: 91,367
BGM
08-19-2010, 03:49 AM
13. ### Using measures with different Likert-type scaling

I need some advice regarding methodology. I am creating a single questionnaire comprised of 4 different measures - all with likert-type scaling. ...

• Replies: 3
• Views: 5,115
08-19-2010, 12:28 AM
14. ### minimum data points for the K-s test for normality

Dear all I have 6 points of data that i need to test for normality. is this enough to use the K-s test? what is the advised minimum for this test?...

• Replies: 0
• Views: 4,538
08-18-2010, 04:45 PM
15. ### data transformation software

Does anyone know of any software that will transform data to normality for me? specifically first one: lognormal second one:burr(4p) third one:...

• Replies: 2
• Views: 3,053
08-17-2010, 01:08 PM
16. ### error on percentile estimation

Hi all, I have a problem that I need help on please. I have some 1000 samples from an unknown distribution, from which I wish to derive various...

• Replies: 2
• Views: 6,515
08-17-2010, 06:01 AM

Can anyone suggest a guide or link for more information on the transformation or non normally dirtibuted data? many thanks yoma

• Replies: 19
• Views: 7,566
08-16-2010, 11:59 AM
18. ### muscle strength gain vs. time vs. age

Anyone have data from longitudinal studies on this? 1% per week seems like a reasonable initial value. Thanks.

• Replies: 0
• Views: 3,387
08-15-2010, 04:24 PM
19. ### A Non parametric equivelent to mixed anova?

Hello, I am trying to find a non-parametric equivalent to a mixed Anova? My data is horrible. Three small unequal groups (8, 8, 4) and data...

• Replies: 1
• Views: 5,064
08-14-2010, 09:36 AM
20. ### paired anova for lack of a better word advice please

Dear All i am stuck at the moment between a rock and a hard place. the short of the story is this. I have 84 petri dishes each containing 4 lines...

• Replies: 15
• Views: 7,111
08-14-2010, 08:41 AM
21. ### post-hocs for repeated measures ancova

hi there, i am running a 2x2x3 repeated measures anova with a covariate i have an interaction between two within-subjects variables, and...

• Replies: 0
• Views: 4,143
08-10-2010, 07:59 AM
22. ### Does anyone know what associated means??

I have a stochastic process. Think of it as an assembly line. For the ith item that enters the process it produces a total work time of Y(ti). A...

• Replies: 1
• Views: 2,993
08-06-2010, 10:55 AM
23. ### 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: 5,583
08-06-2010, 08:25 AM
24. ### How to describe data that trends to a horizontal aymptote?

Hi all, I'm designing a within-subject experiment with one independent variable X, where we are expecting the dependent variable to increase...

• Replies: 0
• Views: 2,967
08-05-2010, 01:13 PM
25. ### Sampling question

I have to estimate 2 parameters from a health claims database: the total dollars paid correctly and the proportion of claims adjudicated correctly. ...

• Replies: 0
• Views: 2,006
08-05-2010, 10:55 AM
26. ### Problems with ANOVA Assumptions and I don't think Kruska Wallis will help

I am conducting an experiment with four independent variables each of which has three or more factor levels. The sample size is quite large i.e....

• Replies: 1
• Views: 5,448
08-03-2010, 01:01 PM
27. ### "significance metrics" for hypothesis testing

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• Replies: 0
• Views: 2,585
p05
08-02-2010, 04:58 PM
28. ### levy process, subordinator

• Replies: 0
• Views: 3,998
08-02-2010, 12:53 PM
29. ### What is the accepted Confidence Interval for a Business research..

Hi all, I need to know the accepted Confidence Level (e.g. whether it is 95% or 99%) and the accepted "Confidence Interval" (e.g. if it is 10 or...

• Replies: 4
• Views: 8,887
07-31-2010, 11:15 AM
30. ### Question about Stationary R^2 and Ljung-Box Statistics in ARIMA Models...

On the results of my ARIMA models in SPSS, I am getting Ljung-Box statistics that are statistically significant (P < 0.05) but also horrible R^2...

• Replies: 0
• Views: 4,253
07-25-2010, 07:44 PM
31. ### t test using diversity index

So, I am trying to perform a t-test using diversity indexes, but the biostat book I am using is a little bit confusing. the calculated t value =...

• Replies: 0
• Views: 3,382
07-23-2010, 08:49 PM
32. ### How to correct negative skew

My dependent variable is negatively skewed with 5 outliers. How do you correct a negative skew? Thanx.

• Replies: 2
• Views: 8,113
07-23-2010, 05:03 PM
33. ### Multicointegration - alternative variable?

Time series: For example, if a dependent variable only have 17 observations could I replace it with something with more data if I want a rough...

• Replies: 0
• Views: 6,841
07-19-2010, 07:31 PM
34. ### variables that are not independent of each other

What are some ways this dependency is modeled with statistical methods?

• Replies: 5
• Views: 3,847
07-16-2010, 05:03 PM
35. ### multiple groups & dichotomous responses

I have a set of data from a number of countries where interviewees have answered simple yes/no questions. The "DV" is, in other words, 1 or 0, and...

• Replies: 8
• Views: 5,297
07-16-2010, 10:29 AM
36. ### Extreme events...

Hi. Is {w:P(w) is very small} acceptable to translate the meaning of extreme events given in the following sentence: An extreme event is defined as...

• Replies: 6
• Views: 4,595
07-14-2010, 07:47 PM
37. ### Intraclass correlation coefficients for linear mixed models

I've been looking around for a while and have yet to find and answer to satisfy my appetite. Hopefully, one of the members here will be able to help....

• Replies: 0
• Views: 3,929
07-13-2010, 02:51 PM
38. ### 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: 2,877
07-13-2010, 02:23 PM
39. ### Log likelihood function for P-EGARCH(1,1)-t needed

Hi guys, I am currently writing my MSc. Finance thesis on calendar effects, using a Periodic Exponential GARCH(1,1) model with student-t error...

• Replies: 0
• Views: 4,107
07-11-2010, 11:30 PM
40. ### Latin Hypercube sampling with correlations

Hello! I am trying to generate a 9-dimensional Latin Hypercube sample (1000 draws or so) where each dimension variable is normally distributed...

• Replies: 0
• Views: 3,228
07-07-2010, 02:57 AM
41. ### How to predict prevalence rate based on demographic factors?

Some background: I've been teaching myself some math and statistics - started developing software as a kid and went right into the field after...

• Replies: 4
• Views: 4,169
07-06-2010, 09:40 PM
42. ### Need Help in identifying problem

Hello all, Imagine you have two time series X1,X2,...Xt - represents incoming volume to the yard, and Y1,Y2,...,Yt - outgoing volume from the...

• Replies: 2
• Views: 2,958
07-06-2010, 08:36 PM
43. ### compute true values monte carlo simulation

Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

• Replies: 16
• Views: 6,678
07-04-2010, 05:19 AM
44. ### statistics calculator to adjust for design effect

Hi there, I'd like to know if anyone could tell me of a stats calculator that can adjust means and confidence intervals of analyses (paired-t and...

• Replies: 1
• Views: 4,968
07-01-2010, 02:41 PM
45. ### NLP Algorithm Evaluation: Help?

Hello guys, We're beginners here and please excuse us if our questions are inappropriate in any way. We have a statistics-related problem, and...

• Replies: 0
• Views: 2,894
06-28-2010, 03:01 PM
46. ### 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: 5,702
06-26-2010, 04:52 AM
47. ### Significant Difference with 2 vars

Hi everyone, Is it at all possible to determine if a group of points on a scatterplot are significantly different from another group of points? ...

• Replies: 7
• Views: 3,765
06-25-2010, 11:03 AM
48. ### Youden Index

Hello, I am doing some ROC analysis comparing grading scales for intracerebral hemorrhage. My question is - can the Youden Index be considered a...

• Replies: 0
• Views: 6,136
06-23-2010, 02:51 PM
49. ### 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: 2,953
06-21-2010, 11:54 PM
50. ### P-value Formula for Z-test Statistic

Hello All, I am trying to find the formula for p-value for a z-test. Ultimately, I would like to code this in PHP, but first need to start by...

• Replies: 2
• Views: 14,929
06-17-2010, 05:13 PM
51. ### Introduction for Observational Study on Red Cars

This is the Introduction for my stats project on red cars vs. speeding tickets received. Let me know what changes to make, and how the intro is....

• Replies: 0
• Views: 3,499
06-13-2010, 09:01 AM
52. ### 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: 1,990
06-12-2010, 03:04 AM
53. ### Mle

Hi guys, I need advice regarding this question: The height of students at university is a random variable from the N(\mu,25) distribution. A...

• Replies: 11
• Views: 3,280
06-10-2010, 01:17 PM
54. ### Repeated measures ancova

Hi I am very stuck does anyone know how to run a repeated measures ancova in spss please!!!!

• Replies: 1
• Views: 4,656
06-09-2010, 05:19 PM

f(x)=e^-(x-\theta) -(x-\theta) is the exponent x>\theta I need to find MLE for \theta I tried doing it with a graph, but I got strange...

• Replies: 4
• Views: 5,318
06-09-2010, 02:09 PM
56. ### dependent cases in logsitic regression, any recourse?

I'm hoping to use logistic regression to analyze a 2x3 repeated-measures factorial design. The IVs are both categorical. The DV is dichotomous...

• Replies: 0
• Views: 2,177
06-08-2010, 01:52 PM
57. ### best way to use Cronbach's alpha?

I am making my first foray into survey based research. A quick question or two about Cronbach's alpha: My survey included questions about...

• Replies: 1
• Views: 6,688
06-07-2010, 03:55 PM
58. ### Regression Model

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• Replies: 3
• Views: 3,879
06-04-2010, 09:04 AM

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