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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. ### A nice easy one about Repeated Measures ANOVA

Hello! A basic question from a not-very-statistically-savvy person: I have data from 2 groups of patients who underwent knee replacement...

• Replies: 5
• Views: 6,488
10-07-2008, 01:00 PM
2. ### Principal components interpretation

I have principal components based on correlation matrix. Statistica PCA method report outputs not only factor loadings that depend on components'...

• Replies: 5
• Views: 3,926
10-24-2008, 04:26 AM
3. ### Factor Analysis Question

Hi everyone, I'm a Trainee Clinical Psychologist, not a statistician but we have research to do as part of our training so I'm hoping someone here...

• Replies: 5
• Views: 3,266
11-10-2008, 04:27 PM
4. ### Centering for interactions in multiple regression ??

This is an e-mail about our discussion. Can someone please help us. I cannot understand any reason to center the variables other than "well it just...

• Replies: 5
• Views: 25,850
12-01-2008, 06:50 PM
5. ### 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
6. ### studying half-hourly time series

hello, I have to study a time serie composed of half-hourly data concerning electric load for the period of 6 years : so in my file data i have...

• Replies: 5
• Views: 4,900
02-24-2009, 03:05 AM
7. ### logistic regression : intercept is NOT significative

Hi everybody I have performed a logistic regression with a stepwise selection. But, at the end, the parameter estimate of intercept is NOT...

• Replies: 5
• Views: 20,274
05-03-2009, 07:26 AM
8. ### generate overdispersed poisson data

Hi there, Can anyone tell me how to produce overdispersed poisson data? An algorithm or something? I find it difficult. Thanx in advance for...

• Replies: 5
• Views: 7,138
06-19-2009, 03:17 AM
9. ### confidence interval for combined data

Hi everyone, I'm new here, so forgive me if I don't get something quite right. I have a question for how best to do a confidence analysis of a set...

• Replies: 5
• Views: 8,158
06-24-2009, 02:32 PM
10. ### p =.046 significant?

If I get a probability value of .046 is this considered significant given significance level of .05?

• Replies: 5
• Views: 8,014
09-02-2009, 10:46 AM
11. ### God you people are clever!

Hi, :wave: I'm collecting data from a single group of 15 participants showing their improvement in a 5 stage levelled test before and after an...

• Replies: 5
• Views: 5,054
05-08-2010, 12:52 AM
12. ### 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
13. ### 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: 16,134
05-11-2010, 02:08 AM
14. ### Converting 1 Distribution to Another

I have a set of values ranging from .01 to 918 with n = 7368. About 3000 values are below 1 and about 150 values are greater than 100. The mean and...

• Replies: 5
• Views: 4,526
03-26-2010, 12:50 PM
15. ### 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: 3,225
05-18-2010, 08:36 AM
16. ### variables that are not independent of each other

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

• Replies: 5
• Views: 3,869
07-16-2010, 05:03 PM
17. ### Spearman-Brown also for the effect of additional raters?

To achieve higher reliability in a questionnaire, it is common to add more items to the questionnaire. If the new items are parallel to the previous...

• Replies: 5
• Views: 5,075
Per
09-23-2010, 04:14 AM
18. ### Z-test for different proportions: why are they all sig. different?

Hi all, so I am wondering what about my data is making all of my Z-tests for different proportions sig. different (and it says actual conf. level...

• Replies: 5
• Views: 5,303
10-03-2010, 06:56 PM
19. ### Right Sample Size

I am new to this blog and I am trying to learn statistics applied in Market Research. I have the following question: Suppose there is a population...

• Replies: 5
• Views: 5,204
11-04-2010, 12:12 PM
20. ### Likelihood Ratio Test

Hello, I am attempting to develop a procedure to reduce the total number of trials while still being assured that the a distribution's parameters...

• Replies: 5
• Views: 4,453
01-13-2011, 02:10 PM
21. ### Deriving meaningful information from a set.

Hello all, I was working for my statistics class and kind of extrapolated a problem. I think sharing this with this forum will help in coming...

• Replies: 5
• Views: 2,839
01-23-2011, 04:22 PM

Hi!, :wave: I want to use Adonis in R (non-parametric permutation MANOVA) to test for relationships between bray-curtis distances (dissimilarities I...

• Replies: 5
• Views: 19,868
02-01-2011, 04:52 AM
23. ### Pharmacology Exp Help

Hello. I have been volunteering at a lab and need help with Behavioral Analysis. My data points are activity (locomotion) "counts" of 10 min...

• Replies: 5
• Views: 2,597
02-24-2011, 10:52 AM
24. ### Converting eta squared to Cohen's d

I need to convert eta squared effect sizes to Cohen's d. It's for a meta-analysis paper, so I don't have the original data set. Is it possible...

• Replies: 5
• Views: 45,673
03-03-2011, 09:11 PM
25. ### Which test should I use?

Working on a medicine research paper here, really hoping someone can help me out. I have a group of patients for which I have data relating to...

• Replies: 5
• Views: 2,668
04-06-2011, 11:00 AM
26. ### Need help to test the significance

I want to make a test to see if the difference is significant or not. What I have is two different groups of values (one with 31 values and the other...

• Replies: 5
• Views: 3,498
04-07-2011, 07:38 PM
27. ### Roy's largest root VS all the other ones...

does anybody know why the statistical significance of Roy's largest root does not imply the statistical significance of the other three popular...

• Replies: 5
• Views: 23,050
04-04-2011, 07:08 AM
28. ### z-test rule.

Hello, I am a new user in this forum. I am wondering whether I can use z-test for a small amount of data, Let us say, "English and Math marks" for...

• Replies: 5
• Views: 4,306
04-19-2011, 12:28 PM
29. ### Optimum solution: Matching Investment & Highest interest

We have multiple securities. Each one has Maturity amount and Interest. Maturity Amount range between USD 100 to USD 1M. Each has corresponding...

• Replies: 5
• Views: 1,866
05-07-2011, 07:58 AM
30. ### 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
31. ### Statistical question about roulette

I was wondering if anyone could help me with a statistics question I have? It would be great if anyone could look at this one. It is based on...

• Replies: 5
• Views: 4,704
BGM
06-13-2011, 04:37 PM
32. ### Estimating a term

I have observations on t_i, where t_i = a_i + b_i. a_i = \mu + e_i, where \mu is constant and e_i is the usual error term with mean 0. I also know...

• Replies: 5
• Views: 1,912
06-13-2011, 03:37 PM
33. ### Random sample - how to get one?

Hi, I’m doing a research on job satisfaction in lawyers and I would like to use a random sample. My question is: how can I do this? In the whole...

• Replies: 5
• Views: 3,228
06-18-2011, 09:03 AM
34. ### Testing Standard deviations for repeated measures design

Hi, I need to do a within subject test of standard deviations. I have 14 people and 4 groups of standard deviations. We want to see if there is any...

• Replies: 5
• Views: 3,621
07-21-2011, 02:16 PM
35. ### Statistical Tests Help

Hi guys, I am completely at odds as to what statistical tests I can use to analyze my data, and I was hoping that you guys could help me. What I...

• Replies: 5
• Views: 2,669
07-22-2011, 04:14 PM
36. ### Help needed urgently - dichotomous question

Hi everyone, I have the following answers to the survey question "are you a new client" (Yes/No). My sample is 1200 clients with 520 respondents....

• Replies: 5
• Views: 3,188
07-28-2011, 07:54 AM
37. ### Ideas with paired data

Yesterday I was lucky enough to work with a statistician from another section in my division. He took me along on one of the consultations he...

• Replies: 5
• Views: 3,904
08-31-2011, 04:45 PM
38. ### Subsampling to obtain a p-value

Hello everybody! This is my first post in this forum, I hope you guys have some ideas for me :) I have ~2000 measurements, namely angles, which...

• Replies: 5
• Views: 3,787
10-07-2011, 12:57 PM
39. ### best way to create ANOVA groups from a range of scores?

Hello Everyone, I have been involved in a discussion with my Experimental Methods of Psychology Instructor about the best way to divide a range of...

• Replies: 5
• Views: 2,954
09-24-2011, 04:46 AM
40. ### Paired t-test?

Hello, I have been working with higher level statistics for so long that I have started to forget rudimentary techniques... I have a sample of...

• Replies: 5
• Views: 3,234
10-03-2011, 04:32 PM
41. ### Cronbach's alpha

Help please! What data do I need to work out the cronbach alpha coefficient? I have 30 responses to a large number of Likert-type questions. We want...

• Replies: 5
• Views: 3,659
10-14-2011, 05:01 AM
42. ### Quick question about reporting statistical results

Hey there, just wondering about proper reporting of results of my 2x2 ANOVA experiment: -I compared lots of morphometric measurements of sea...

• Replies: 5
• Views: 2,951
10-19-2011, 01:01 PM
43. ### Cluster analysis

Hi all! I am new here, and I need some help. I have done some cluster analysis (K-means), and got four groups, two of which are "high" and "low"....

• Replies: 5
• Views: 2,103
11-12-2011, 10:34 AM
44. ### Mixed models in SPSS -- swapping predictor and predicted?

Hi, I'm working on a project where I have repeated measures of a (continuous) IV and DV. At each measurement "time" I would like to predict the...

• Replies: 5
• Views: 3,341
11-10-2011, 05:29 PM
45. ### Generate Data for Correlated Continuous and Discrete variables

Hi I was wondering if anybody could suggest an appropriate approach for the following... I have one independent variable, X, which takes the...

• Replies: 5
• Views: 4,083
11-11-2011, 02:29 PM
46. ### Statistical Inference exam question

My question is why divide 4 out of 10?? and where did 4 come from? also I don't understand where 1.96 come from.

• Replies: 5
• Views: 9,734
11-14-2011, 09:37 PM
47. ### Sum of independent beta-Bernoulli random variables

I'm looking for the distribution of the sum of independent beta-Bernoulli random variables, that is Bernoulli random variables with beta-distributed...

• Replies: 5
• Views: 6,679
11-30-2011, 04:36 PM
48. ### Correlational stusy, Conformity and Intelligence

Im doing a research correlation between Confirmity and Intelligence. Got 60 sample size. All participants where given 2 tests to fill up, Approval...

• Replies: 5
• Views: 3,591
12-29-2011, 07:51 PM
49. ### 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: 3,179
02-14-2012, 01:15 AM
50. ### Minimum sample for a t-test independent samples

I have a sample which consists of 2 treatments and 15 unique samples. Data are interval. It was obtained by measuring arguments in similar pages from...

• Replies: 5
• Views: 3,874
12-30-2011, 11:59 AM

Hi all, I have this question and have been toiling on it for days. Am not sure if I'm tackling it correctly. A group of patients attending a...

• Replies: 5
• Views: 4,205
01-02-2012, 11:23 AM
52. ### Pre/Post-Survey Methodology Question

I'm working on a project where we did a pre-survey to get a baseline assessment on health knowledge and attitudes in several states, conducted a...

• Replies: 5
• Views: 13,210
01-06-2012, 06:35 AM
53. ### Determining Significance Based on Prelimiary Data

I have conducted a test where I measured the same subjects (n =9, 2 groups) over a period of 8 days. To determine significance between the two groups...

• Replies: 5
• Views: 1,906
02-27-2012, 12:58 PM
54. ### 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: 2,879
03-21-2012, 02:30 PM
55. ### How to classify data into group?

I have collected warehousing cost data from 200 companies...and then converted to % There are 200 data (lowest from 1.5 % to highest of 40 %). My...

• Replies: 5
• Views: 3,860
06-05-2012, 07:54 AM
56. ### Need help defining terms for mixed model nested ANOVA

Hello - I am looking at the effects of restoration practices on a suite of environmental soil parameters through time. I am having trouble defining...

• Replies: 5
• Views: 2,876
07-16-2012, 04:59 PM

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