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Threads 1021 to 1080 of 3192

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: 18,620
10-11-2014, 12:02 PM
1. Capability Analysis with Attribute Data

Is it possible to run Capability Analysis with attribute data? Data is a yes/no or pass/fail spanning 6months or work. Thank you for any...

• Replies: 1
• Views: 2,752
11-15-2011, 08:21 PM

Hello everyone! I am new to this forum, but excited to become more involved :tup: I am currently a mathematics/statistics student and I am looking...

• Replies: 1
• Views: 2,749
08-04-2011, 05:23 PM
3. Product pricing question

Hello all. It's been a long time since I've been on this forum. Glad I was able to find it again. I'm afraid my stats experience is limited to...

• Replies: 0
• Views: 2,747
12-08-2008, 07:41 AM
4. how to obtain p-value from test statistic

I am familiar with how to obtain the p-value from the t-statistic - the t-statistic is calculated by looking at the difference in means in two...

• Replies: 0
• Views: 2,744
12-29-2016, 03:26 PM
5. 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: 2,743
03-09-2012, 07:52 AM
6. Need large data sets

Hello, I'm doing some Q/A work on a new app for data visualization. I can generate my own random data sets, but I'd like to use some real-world...

• Replies: 2
• Views: 2,742
03-10-2009, 05:55 PM
7. Trouble with a dichotomous decision study

Any help appreciated: Have a study with video clips and a Yes / No answer. There is a correct answer. There are ~20 (but this can be changed) clips...

• Replies: 0
• Views: 2,742
09-09-2009, 11:10 AM
8. 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: 2,738
03-13-2012, 03:10 PM
9. weibull distribution

i'm studying film life cycle using the weibull distribution. given the survival function, there exists the hazard rate, or the failure rate, a point...

• Replies: 0
• Views: 2,737
02-04-2008, 12:50 PM
10. How to combine Probability Distribution Function of Two correlated variables?

I have the probability distribution Functions(PDF) of the wind speeds of two wind sites which have a certain Pearson's correlation coefficient. How...

• Replies: 0
• Views: 2,737
06-04-2012, 05:21 PM
11. A bit rusty could someone give me a shove in the right Direction Please

Hi guys , I'm a management PhD student. I did a module on SPSS 14 before having to take a year out. I'm now starting to write up a bit of my thesis...

• Replies: 1
• Views: 2,733
08-25-2008, 11:05 AM
12. Standard error of a weighted composite score

I would like to calculate the standard error of a weighted composite score. The composite score is based on the sum of a respondent's rating to a...

• Replies: 2
• Views: 2,733
11-20-2013, 03:10 PM
13. Can they called unequal sample sizes and t-test/ANOVA?

I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

• Replies: 0
• Views: 2,732
05-02-2011, 03:09 AM
14. Uniform minimum variance unbiased estimator

Hello, I need help with the develpment of this exercise that I'm trying to solve. Let \widehat{\sigma} be the U.M.V.Uestimate of \sigma when \mu...

• Replies: 0
• Views: 2,732
03-18-2013, 12:21 AM
15. Centering level-1 interaction terms in HLM

Dear all, I’m running multilevel analyses with HLM and wish to examine an interaction between two level 1 predictor variables. Following...

• Replies: 1
• Views: 2,732
12-21-2016, 01:24 PM
16. Unconditional covariance matrices from multivariate GARCH specifications

Hi all. I thought someone here might be able to help me prove some results which I have not been able to find in journals. Can anyone help me...

• Replies: 0
• Views: 2,730
07-11-2011, 12:07 PM

I thought we could gather various interesting articles here. A general rule is that it should be about statistical methods or mathematical...

• Replies: 2
• Views: 2,729
03-14-2013, 03:49 PM
18. Paired Vs unpaired t-test - which one to use?

Good morning, I am a little stuck - I understand the difference between the two tests and am happy with written examples in a stats book I found....

• Replies: 1
• Views: 2,722
08-18-2014, 07:12 AM
19. measure of effect size for categorical association

Hello, I am having difficulties in wrapping my head around an issue regarding chi-squared statistic, Cramer's V, and Cohen's measure of effect...

• Replies: 1
• Views: 2,721
11-03-2016, 08:20 AM
20. 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: 2,717
03-22-2012, 11:12 AM
21. breaking data into training and testing (hold-out) sets

Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare the predictive...

• Replies: 3
• Views: 2,716
07-21-2012, 04:47 PM
22. Help with dissertation

Hello everyone. I need someone to make up a table for me for my dissertation. I've got the answers to it but can't figure out how the table can be...

• Replies: 1
• Views: 2,714
03-19-2011, 09:58 AM
23. setting parameters in G*power for correlation tests

Hello, everyone :) Need your help on how to set parameters in G*power... I am doing two very simple tests: one on pearson correlation between...

• Replies: 0
• Views: 2,713
03-29-2013, 01:28 PM
24. Applicability of Bayes to Contingency Tables (Chi-Squared)

Is it possible to apply the Bayes factor to tests of/for independence/homogeneity (Chi-Square)? You can find a file below. The contingency table...

• Replies: 1
• Views: 2,711
10-25-2016, 08:18 AM
25. Help with repeated measure analysis.

Hi there, I am confused in how to analyze a set of experimental data. I consulted a number of books and did extensive research on the net, but could...

• Replies: 0
• Views: 2,710
04-28-2010, 04:02 AM
26. Repeatability and Reproducibility

Hi, I'm new to this and I'm not exactly a math expert. I am carrying out research in a lab, and I want to test repeatability and reproducibility of...

• Replies: 2
• Views: 2,706
02-21-2013, 10:25 AM
27. Uncertainty

Hi there, If I take measurements every minute for a whole hour, and I know the uncertainty of a single measurement, is it possible to calculate...

• Replies: 1
• Views: 2,704
05-20-2009, 06:42 PM
28. Relative Risk calculation

Hi bit of help would be much appreciated for what is probably a bit of a silly question. I am trying to calculate relative risks of an adverse...

• Replies: 6
• Views: 2,703
10-06-2014, 04:41 PM
29. Ordinal Regression vs Spearmans Rank Correlation

Hello, My name is William, I am currently at my last year at Newcastle University, UK carrying out research for my dissertation on how social...

• Replies: 3
• Views: 2,701
04-01-2015, 06:44 AM
30. interpreting SS in permutational (M)ANOVA with adonis

Dear all, I want to use the adonis() function in R package vegan to do a permutational univariate analysis of variance (instead of multivariate)...

• Replies: 0
• Views: 2,699
06-28-2012, 10:46 AM
31. Desperate urgent help

Hi everybody, First, let me say how much I appreciate your help here. Its a life saver. I have a presentation tomorrow on my research and I am...

• Replies: 3
• Views: 2,698
02-20-2009, 02:07 AM
32. need a little hint..... Rosenberg measure of self esteem

Hey everyone, I am not the most statistacally minded person so please talk to me like you would to a 4 year old :eek: I am conducting a study...

• Replies: 3
• Views: 2,696
03-07-2010, 10:58 AM
33. Good Book on Mathematical Statistics

I'm a mostly self-trained analyst with degrees in the social sciences but not in statistics. I'm looking to improve my knowledge of the mathematics...

• Replies: 9
• Views: 2,695
09-17-2014, 07:09 AM
34. 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: 2,693
04-03-2012, 05:20 AM
35. Statistical matching

Hi Folks, Am New to this statistical analysis domain, but have a problem at hand. I have a list of movies and each movie have various attributes...

• Replies: 0
• Views: 2,687
04-07-2011, 04:36 PM
36. Citation needed for removing 3 Stdev outliers

Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

• Replies: 3
• Views: 2,687
07-30-2012, 04:51 PM
37. 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: 2,684
05-08-2010, 01:09 AM
38. Adding random error to ordinal IV to make it more continous

In survey data, attududinal questions are often coded 1-5, 1-7, 0-10 etc. These kinds of variables are often reffered to as approximately...

• Replies: 2
• Views: 2,684
10-07-2011, 09:37 AM
39. 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) – e/(1 +...

• Replies: 1
• Views: 2,678
BGM
01-27-2012, 11:54 AM
40. Where to find data (morning running vs evening running)?

Hi, I am trying to do some analysis on running time: morning vs evening. Does anyone know where I can find data? Thanks in advance. John

• Replies: 9
• Views: 2,674
05-02-2012, 05:42 PM
41. Using Mann-Whitney test when all values in one data set are zero (SPSS vs Graphpad)

I would be very grateful for advice on the following problem: I am examining the frequency in which political issues are reported in the national...

• Replies: 5
• Views: 2,673
08-29-2012, 03:50 AM
42. Poisson point process

I came across this in a network model: Distribute N points according to a homogeneous Poisson point process in a two-dimensional space of unit...

• Replies: 0
• Views: 2,672
12-06-2016, 02:24 PM
43. How many people are needed for a valid sample?

Question I have to answer: In order to collect a survey of opinions, I would like to take a sample of a city with a population of 600,000 people....

• Replies: 0
• Views: 2,671
10-07-2011, 06:07 PM
44. My professor told me that a t-test wasn't the correct procedure to use in a report

In my report it states: "the incidence of vomiting after treatment showed a 9% decrease in the control group, which was not significantly...

• Replies: 2
• Views: 2,669
10-02-2010, 01:34 PM
45. 2 Sample T Test for Nonnormal data

Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

• Replies: 10
• Views: 2,669
04-09-2013, 07:13 PM
46. Help with thesis research on social bookmarking

Hi, I'm writing my thesis right now and I must admit that I underestimated the complexity of the required statistics a bit. My description is quite...

• Replies: 1
• Views: 2,668
11-07-2008, 09:54 PM
47. Small difference but still significant?

I hae sample size of 67 participants. They took a pre and post knowledge survey. The maximum score was 14 answers correct. I run a pair ttest. These...

• Replies: 11
• Views: 2,668
11-30-2014, 03:42 AM
48. Repeated measures with different cohorts

Dear all, I have data from 3 different art groups (orchestra, dance, musical theatre) collected in 3 different times of measure. Data is...

• Replies: 0
• Views: 2,667
10-27-2016, 06:36 AM
49. 4 simultaneous non-independent measures – should nested ANOVA work?

Hi all, this is my first time posting here, but I’m very stuck. I have to analyze data from an animal behavior experiment. I have 3 strains, with 20...

• Replies: 0
• Views: 2,664
08-14-2014, 02:35 PM
50. different intercept with Multinomial vs Binomial Logistic?

I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was...

• Replies: 0
• Views: 2,663
09-06-2011, 03:02 PM
51. S-shapec urve goodness of fit

hi, I'm looking for a statistical test to prove (statistically) that the cumulative curve is S-shape When I try to look for answer I get 2...

• Replies: 0
• Views: 2,662
12-07-2016, 01:44 AM
52. Binomial Test that does not assume indepence? (using a repeated measures design)

Hi, I am looking for a way to analyze data for the following experiment: subjects were presented with two separate acoustic signals at the same...

• Replies: 1
• Views: 2,659
08-23-2009, 01:08 PM
53. 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: 2,655
04-06-2011, 11:00 AM
54. Considerations for choosing the right model

Hello, I was wondering how one chooses the right model for a classification problem. Let's say I have a binary outcome variable, and many...

• Replies: 1
• Views: 2,654
02-13-2012, 09:42 AM
55. PAVA - isotonic regression

Hello, I'm searching for a research, and I hope I can get your help. I have an article showing an estimator for a cdf F, Fn, based on a function...

• Replies: 0
• Views: 2,653
04-09-2011, 11:27 AM
56. beating the rules at discrete sampling

hi, I am looking at the question of how to sample rare occurances, like a rare defect in a manufacturing line. If I use the standard sample size...

• Replies: 4
• Views: 2,653
06-11-2015, 02:42 AM
57. 3x3 factorial design, repeated outcome measure

I have a 3x3 factorial design (3 levels of treatment and 3 different environments) - the outcome is a repeated measurement taken at every week - the...

• Replies: 1
• Views: 2,650
10-07-2014, 02:53 AM

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