1. Announcement:
05-10-2017
Views:
1,775
Page 23 of 54 First ... 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 ... Last
Threads 1321 to 1380 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: 18,617
10-11-2014, 12:02 PM
1. ### (adjusted)R-squared / eta-squared / omage-squared for ANOVA

Dear all, When obtaining ANOVA results with SPSS we also get a R-squared and an adjusted R-squared. For a multi-way ANOVA the eta-squared is given...

• Replies: 2
• Views: 7,218
08-09-2013, 04:35 PM
2. ### Permanova design for BACI study (using Primer)

my first question here! i need to do a few analyses on a biological dataset, and I am a bit puzzled about how to set my Permanova design. I use...

• Replies: 5
• Views: 3,148
08-09-2013, 03:51 AM
3. ### Margin of error for stratified survey sample

Hi all, first-time poster here. I have a stratified sample of respondents to a survey with the following make-up: So the total population...

• Replies: 0
• Views: 1,633
08-08-2013, 08:17 PM
4. ### Mistakes by teachers of statistics

A while ago I came across a paper that claimed many statisticians (or maybe it was teachers of statistics in universities) did not under some basics...

• Replies: 0
• Views: 1,131
08-08-2013, 08:00 AM
5. ### Does my research proposal make sense? [Basic Stats]

Hi everyone, I'm new to statistics, statistical packages and research methods in general. Yet I'm fascinated by the subject and want to learn as...

• Replies: 2
• Views: 2,790
08-06-2013, 04:46 PM
6. ### Standard Deviation of averages based on uneven sample sizes--possible? alternative?

Dataset consists of ratio of fouls to (fouls+balls in play) at count 3-0 for 346 individual baseball players over 8 years. I calculated the STD...

• Replies: 0
• Views: 1,256
08-06-2013, 03:10 PM
7. ### Data collection

Hi everyone, i have a simple question that i actually cant get my head around (have been working on this assignment far to long and hard!) The...

• Replies: 0
• Views: 967
08-05-2013, 11:39 PM
8. ### Likert scale analysis - grouped items

Good morning, I am currently analyzing a Likert scale questionnaire (5 points) of 28 items. The items of the questionnaire are grouped into...

• Replies: 0
• Views: 1,265
08-05-2013, 04:02 PM
9. ### transformations of random vars support set

Hi, I understand the transformations of variables concept, getting the Jacobian and so on, but I am having trouble with defining the support...

• Replies: 0
• Views: 1,435
08-05-2013, 07:21 AM
10. ### 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: 5,692
08-04-2013, 07:08 PM
11. ### SOS!Correct name of sampling method.

Dear all, please help me as I have to finish my dissertation in one week and I unfortunately cannot find the correct name for the sampling method...

• Replies: 1
• Views: 1,325
08-04-2013, 02:02 PM
12. ### Dissemination Research

Hey Guys/Girls!:D Currently im in the finalizing stage of my master thesis (On gossip versus rumor dissemination on the work floor). Out of a...

• Replies: 1
• Views: 1,214
08-04-2013, 01:44 PM
13. ### Rarefaction and species richness

Hi all! First of all thank you to take a look to my question, I hope this is the right subforum and I hope to explain it right! I have a...

• Replies: 0
• Views: 2,228
08-04-2013, 12:51 PM
14. ### Logistic regresion with only discrete IV

Hi, I saw a few binary logistic regressions in Minitab where we did not have any continuous variables and the analysis Minitab gave was simply the...

• Replies: 5
• Views: 3,601
08-03-2013, 02:29 PM
15. ### Which Model of ICC to use: one way; two way mixed, or two way random?

Hello All, I am using spss 21 My goal is to justify aggregating individual lower-level viability scores into a team higher-level viability score...

• Replies: 0
• Views: 4,479
VCH
08-02-2013, 05:26 PM
16. ### Rank Based Inverse Normal Transformations for Scales

Hi everyone, I am trying to fix my normality distribution among a series of psychological and social science scales so that I can perform pearsons...

• Replies: 0
• Views: 2,891
08-02-2013, 07:23 AM
17. ### p-values : binomial vs. normal

I've taken and tutor some basic statistics courses. What I've been taught is that to compute p-values (false positive rate) for hypothesis testing on...

• Replies: 10
• Views: 2,947
08-01-2013, 07:28 PM
18. ### Event study on index

Dear all, I'm conducting several event studies for my thesis. But I'm wondering if it's possible to conduct one on an index. I want to see if the...

• Replies: 1
• Views: 1,031
08-01-2013, 03:43 AM
19. ### How to compare the convergence over time between two groups?

Hello, My goal is to check if the convergence of the Interquartile Range (IQR) over time is significantly different between two groups. I have...

• Replies: 0
• Views: 1,347
ido
07-31-2013, 03:10 AM
20. ### Multiple comparisons after Kruskal-Wallis

Hello everyone, I have been looking for differences in attitude (dependent variable, continuous) between >2 unmatched samples (independent...

• Replies: 1
• Views: 10,555
07-30-2013, 10:39 AM
21. ### A little guideance needed...

First off, I hoped I've posted in the right forum-if not sorry xx I'm working through a sample question regarding a sample of 20 sections of...

• Replies: 3
• Views: 1,931
07-30-2013, 07:15 AM
22. ### Variables that are Both Predictors and Response Variables

I have been reading about variable/feature selection algorithms. All of the algorithms that I have seen presume that there is a clear distinction...

• Replies: 0
• Views: 1,434
07-29-2013, 09:26 PM
23. ### What test to identify words used more frequently by one group than another?

I have two groups of subjects, A and B. I have a text sample produced by each subject. My goal is to idenitfy those words that are used significantly...

• Replies: 6
• Views: 1,593
07-29-2013, 03:23 PM
24. ### New to time series stats (want spikes)

Hi, I have been out of school for a while now (BS CompSci) and I only took one Statistics class many years ago. So I'm definitely not an expert. :o...

• Replies: 1
• Views: 3,917
07-29-2013, 04:16 AM
25. ### Analyzing a repeated experiment with only one subject

My experimental setup is explained using a simplified analogy of what I am doing: We are dropping 40 balls into a body of water. All the balls are...

• Replies: 0
• Views: 1,462
07-25-2013, 09:43 AM
26. ### Can I use regression to increase sample size of survey responders?

I have a question about how I can extrapolate responses from a survey to apply to the entire population with a decent level of confidence and...

• Replies: 1
• Views: 1,183
07-24-2013, 05:26 PM
27. ### Mann-Whitney U failed assumption?

Hi all, I hope you're able to help. I have some numbers that need crunching. I would normally use an independent-samples t test, however, as...

• Replies: 2
• Views: 937
07-24-2013, 02:50 PM
28. ### Gibbs sampler problems

I am trying to implement the gibbs sampler found here http://www.people.fas.harvard.edu/~plam/teaching/methods/mcmc/mcmc.pdf on page 175. It is...

• Replies: 1
• Views: 1,625
07-23-2013, 12:46 PM
29. ### Weighted Co-efficient Of Variation.

Hey folks, I have the test scores of 9 different psychology tests taken by primary school students. 390 students gave the test. I want to categorize...

• Replies: 0
• Views: 2,167
07-23-2013, 06:30 AM
30. ### level of significance 0.1%

Hi! Would it be OK to use a level of significance of 0.1 -instead of traditional 0.05- when using non-parametric tests in bivariate analyses if...

• Replies: 9
• Views: 24,197
07-23-2013, 02:55 AM
31. ### Insight from statisticians needed - identifying which parameters separate data.

Hi, I've got a dataset consisting of a few hundreds of dimensions. Each dimension has a value assigned to it at every time point. The data is...

• Replies: 0
• Views: 2,508
07-21-2013, 06:26 PM
32. ### Slovin’s Formula in Excel (Calculating Survey Sample Size)

Hello All, If anyone can help me with an formular that has had me somewhat stumped for the last few weeks now, I would be eternally grateful ! I...

• Replies: 0
• Views: 27,054
07-21-2013, 09:04 AM
33. ### ANOVA or Regression? and how to put data in SPSS in order to perform the test?

I am doing research about recycling and want to know the relationship between recycling costs of some electronic products and the composition of...

• Replies: 0
• Views: 1,271
07-20-2013, 09:28 PM
34. ### t-test

The inpatients infection rates will be tracked from the entire inpatient population on all three adult units allowing it to be compared to the rates...

• Replies: 2
• Views: 1,284
07-19-2013, 03:56 PM
35. ### Help Needed: How to assess heterogeneity/diversity of values in the group?

Dear forum members, I am trying to come up (or to find an existing one) with a measure of how many different values the group of numbers has. ...

• Replies: 0
• Views: 968
07-19-2013, 12:45 PM
36. ### Are my observations independent or not?

Hi everyone! I have an issue with my observations. I don't know if I can state they are independent or not. In my study, I have 8 different tasks...

• Replies: 4
• Views: 3,308
07-18-2013, 02:33 PM
37. ### Extrapolating to a population from a sample

Hello, I am having problems with a seemingly simple question. Here is the situation: Imagine, I grow 3 kinds of trees (A, B, C) for sale in a...

• Replies: 4
• Views: 1,942
07-18-2013, 02:22 PM
38. ### Joint Probability From Correlation Function

Dear all I have the following problem. Given a set of correlated binary variables, can I determine the joint probability from the correlation...

• Replies: 3
• Views: 3,772
07-18-2013, 03:14 AM
39. ### multivar normal distribution

Hi, I have X, Y and Z that have N distribution and I got the E(X|Y) and E(X|Z) using the bivariate rules, but for E(X|Y,Z) I don't know how to...

• Replies: 1
• Views: 893
07-15-2013, 11:24 AM
40. ### Moderated Mediation Macro Limitations

Hello! I am currently working on my thesis and my data seems to fit a moderated mediation model but I'm up against some of the MODMED limitations....

• Replies: 6
• Views: 3,020
07-13-2013, 05:43 PM
41. ### which test?

Hi i have some data and i want to analysis them. i have 64 mouses at 8 group, i took 2 drugs to them with different tubes and doses. so i want...

• Replies: 1
• Views: 1,353
07-13-2013, 06:49 AM
42. ### [R] permanova for multivariate repeat measures toxicology data set

Hello, I would like to use a permanova to analyze my repeated measures, multivariate data set using the package vegan (adonis function) in R. I...

• Replies: 0
• Views: 2,909
07-12-2013, 03:55 PM
43. ### random effects model

In Random Effects model, what do Qb and d indicate?

• Replies: 1
• Views: 1,009
07-11-2013, 03:50 PM
44. ### Latent Factors and Dimensionality

Can someone briefly explain to be the difference between factors in a latent sense and a dimensional sense? I've managed to get myself confused and I...

• Replies: 3
• Views: 1,281
07-10-2013, 11:51 AM
45. ### what statistical techniques to use?

Hello all, I am really new to this, so please bear with me. In essence, I am looking at whether poor institutional performance encourages...

• Replies: 0
• Views: 1,317
07-09-2013, 07:12 PM
46. ### Factor analysis, what type of data can I use?

Hello everyone, I have a social science dataset composed of circa 40 variables. The data types I am using are quite diverse. The variables I am...

• Replies: 18
• Views: 7,178
07-08-2013, 11:38 AM
47. ### Comparing non hyper-rectangular design space to uniform distribution

Second post here, another out there question... Does anyone know how to compare a design space point distribution to a uniform distribution, if...

• Replies: 0
• Views: 1,190
07-08-2013, 08:36 AM
48. ### Generate Space Filling Designs with nonlinear constraints on the design space

Hey everybody, thanks for taking the time to view my post. I was wondering if anyone knows of any software that will allow a user to create a...

• Replies: 0
• Views: 786
07-08-2013, 08:32 AM
49. ### Sampling from Tweets or Tweet Users

Dear All, We would lile to do Twitter Analysis and want to read tweets for certain topic to decide wheter they are positive,negative or neutral ....

• Replies: 1
• Views: 913
07-08-2013, 03:33 AM
50. ### Combining samples for EFA

Hello, I have conducted an experiment in two different countries. The experiment included a survey. The same survey was used. Is it valid to...

• Replies: 1
• Views: 765
07-08-2013, 03:25 AM

hi everyone! I have the following question: while running univariate GLM, I have encountered the situation when mean differences between groups...

• Replies: 1
• Views: 963
07-08-2013, 03:22 AM
52. ### How to analyze my bat data...number of bats vs. distance categories..

Hello. I have some bat data that looks a bit like this: Distance from Unit Number of bats recorder 0-10metres ...

• Replies: 1
• Views: 1,905
07-07-2013, 02:54 PM
53. ### Can you estimate the power of a test by simulating data?

I have generated 1000 samples (four groups using the sample size, mean, and standard deviation for each group for a normally distributed variable)...

• Replies: 6
• Views: 1,632
07-06-2013, 06:31 PM

Page 23 of 54 First ... 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 ... Last

Use this control to limit the display of threads to those newer than the specified time frame.

Allows you to choose the data by which the thread list will be sorted.

Note: when sorting by date, 'descending order' will show the newest results first.