1. Announcement:
05-10-2017
Views:
1,811
Page 17 of 54 First 1 2 3 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 ... Last
Threads 961 to 1020 of 3193

# 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: 18,657
10-11-2014, 12:02 PM
1. ### Comparing three groups that have been analysed by Friedman's ANOVA

Dear all, I have been struggling with the following problem and would be extremely grateful for some help. :confused: I have three groups of...

• Replies: 0
• Views: 2,857
02-29-2012, 04:04 AM
2. ### Partial Least Squares

Hello, I am doing a project about "Partial Least Squares", and I find it a bit hard to understand the math part of the model. I was wondering if...

• Replies: 0
• Views: 2,856
05-24-2008, 11:20 AM
3. ### Nominal variables

I use a bivariate probit model to detect the choice between two strategies. I use besides the more interesting variables, some control variables....

• Replies: 0
• Views: 2,856
12-05-2010, 09:35 AM
4. ### Randomization techniques

Hi there, I was wondering whether you could recommend some simple randomization technique. I need to conduct a survey with a sample population...

• Replies: 0
• Views: 2,856
12-21-2010, 02:01 AM
5. ### Cronbach's alpha with weighted data

Hi I have a test whose reliability I want to calculate, using Cronbach's alpha. The first 18 questions are scored 0 or 1 (right or wrong). The...

• Replies: 0
• Views: 2,856
09-29-2011, 06:03 AM
6. ### Samples drawn from distributions without means: What inferences from subsamples?

I am doing some work for a small nonprofit on time trends in U.S. income inequality, and comparing estimates based on samples from different surveys....

• Replies: 1
• Views: 2,855
11-19-2010, 01:05 AM
7. ### Correlation

I have a list of vehicle models and a number of costs associated with them. For example: Mazda 1000.50 euro Peugeot 2000.23 euro Mazda...

• Replies: 12
• Views: 2,853
12-04-2008, 09:32 AM
8. ### 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: 2,853
07-16-2012, 04:59 PM
9. ### Longitudinal Regression Issue

Hi there, I am conducting a hierarchical longitudinal regression over an 18 month time span. I have main effects, quadratic terms and interactions...

• Replies: 1
• Views: 2,851
01-22-2009, 02:16 AM
10. ### 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: 2,851
03-21-2012, 02:30 PM
11. ### Sample Size Calculater based on a Known Population Size

Hello all, Part of the research objectives is to achieve generalisation of the findings and extend it to the rest of organisation. To do so, I...

• Replies: 0
• Views: 2,845
07-31-2012, 03:43 PM
12. ### How do I compare different demographic groups that did the same survey?

Hi, this is my first post so apologies in advanced if I'm asking things incorrectly! I'm doing a market research course and we've conducted a...

• Replies: 0
• Views: 2,844
05-16-2011, 06:11 AM
13. ### Maximum number of groups in Kruskal Wallis one-way analysis of variance

Is there a maximum number of groups in Kruskal Wallis' one-way ANOVA? I am looking at a data set with 42 separate groups and I am unsure if there...

• Replies: 5
• Views: 2,837
01-12-2017, 07:14 PM
14. ### Bayesian model - Prior - Sensitivity Analysis

Hi, I'm looking for pointers(articles, papers etc) on sensitivity analysis on prior distributions in bayesian models. Could someone point me to...

• Replies: 0
• Views: 2,834
01-23-2011, 06:33 PM
15. ### How to test a hypothesis comparing two sets of likert item data

Hi, I want to test a hypothesis but my two variables use likert item data and I don't know if they can be tested together. For example, Q1....

• Replies: 6
• Views: 2,831
11-29-2012, 03:38 AM
16. ### Roulette- reducing variance

Hello gents. I am new here and I have a question. Is someone here has a bit of will and knowledge around some statistical software or programming...

• Replies: 10
• Views: 2,828
05-16-2013, 06:14 PM
17. ### Normal Extreme Values

Mostly I have been answering questions, but today I am asking one: what is the distribution of the maximum of n draws from a normal distribution? ...

• Replies: 2
• Views: 2,826
10-17-2010, 11:19 PM
18. ### SEM - model fit question

Hello all, my first post here. I was hoping that you could help me decide whether to decide for one model or another. Both have good fitting...

• Replies: 2
• Views: 2,825
03-31-2011, 10:49 AM
19. ### Question about Statistics Application to C=0 Zero Acceptance Number Sampling Plan

My company is using the following sampling table based on Nicholas Sequigla's Zero Acceptance Number Sampling Plan: ...

• Replies: 0
• Views: 2,825
11-14-2011, 06:29 PM
20. ### comparing two charts

Hi, i am new in forum and i am an amateur in Statistics. I have two data sets of the same thing and i want to compare them. For example i have 20...

• Replies: 3
• Views: 2,822
05-06-2009, 05:20 PM
21. ### Calculating a sample size for a study

Hi, I am trying to do a study on patients with a certain disease. I would like to retrospectively review their charts and check whether there were...

• Replies: 3
• Views: 2,822
10-24-2010, 10:24 AM
22. ### Hierarchical / variance partitioning - criticisms of the method

I'm about to use variance partitioning to interpret my results of a given linear regression model and across models and have come across various...

• Replies: 0
• Views: 2,821
Ph8
09-17-2013, 03:16 PM
23. ### Sample size help!!

Hello! New to the forum but would greatly appreciate any help people may have to offer... Essentially I am trying to organise a scientific study...

• Replies: 5
• Views: 2,821
11-17-2014, 03:53 PM
24. ### repeated measurements

Hi there, I am struggling to understand the way we analyze longitudinal data and I've gone through the net and some books but still have some...

• Replies: 0
• Views: 2,817
01-14-2010, 10:29 AM
25. ### nearest neighbor

I am trying to understand some paper. In there author has the sample of 140 observations with respective x and y for coordinates. He then proceeds...

• Replies: 1
• Views: 2,813
03-04-2010, 12:32 PM
26. ### Survey statistics

Hi, I agreed to help a friend out with a project and am trying to find appropriate statistical tests for survey data, but I fear the survey itself...

• Replies: 4
• Views: 2,813
01-01-2011, 02:20 PM
27. ### 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: 2,813
01-23-2011, 04:22 PM
28. ### Which test to use please?

Hello, I am relatively new to Stats and am have troubles deciding which test to use. I am testing the risky shift phenomenon. Participants were...

• Replies: 2
• Views: 2,811
03-19-2013, 12:48 PM
29. ### Determining sample size in a factorial repeated measures ANOVA using GPower

Hi all Can anybody tell me which F-test option in G power 3.1.9.2 is appropriate to find out the sample size for a 2x2x2 repeated measures ANOVA?...

• Replies: 0
• Views: 2,811
07-15-2014, 11:35 AM

Hi to all. I desperately need a method to compare positive and negative likelihood ratios of a diagnostic test within two strata (e.g. likelihood...

• Replies: 0
• Views: 2,810
07-13-2009, 07:20 PM
31. ### Help with comparing variability of 3 variables on different scales

Hi, I have 3 socioeconomic variables on different scales (yearly income, job category, and years of education) and I'm interested in determining...

• Replies: 0
• Views: 2,809
10-05-2013, 04:02 PM
32. ### Simple regression

Hi, I am having a problem and I know a way to solve but don't know how to statistically implement it. I'm trying to summarize the problem in a...

• Replies: 4
• Views: 2,808
12-25-2009, 09:18 PM
33. ### what p-value do I use with a small population size?

Hello everyone, I have been told that I should have a smaller p-value threshold rather than the "usual" p=<0.05 threshold to determine...

• Replies: 2
• Views: 2,808
08-21-2013, 04:43 AM
34. ### Multivariate Normality accepted at 5% significance level but rejected at 1% ??

Hi, I am new to this forum. I am trying to test whether a set of variables in the data follow multivariate normal distribution. I found Mardia's...

• Replies: 1
• Views: 2,804
03-27-2013, 02:30 PM
35. ### What statistical test should I use?

I have created high and low variables from 1 variable. I want to see whether the mean of the "high" subjects differs from the mean of the "low"...

• Replies: 4
• Views: 2,797
02-09-2011, 05:19 AM
36. ### 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: 2,797
08-06-2013, 04:46 PM
37. ### How to run random effect model on spss? or anyother soft.

Hi, I have estimated a fixed effect model from a panel of time series data. I need now to estimate a random effect model? Please any help...

• Replies: 0
• Views: 2,796
03-30-2010, 01:45 PM
38. ### Chernoff Faces Taken Seriously?

Often I come across web articles or books mention Chernoff faces as a way to efficiently express multivariate data with up to 10 different numeric...

• Replies: 1
• Views: 2,795
08-04-2011, 11:37 AM
39. ### Why "controlling for X" studies may be fatally flawed

I came across this paper this week, which was quite an eye-opener for me, so I wanted to share. We are probably all familiar with "controlling for...

• Replies: 3
• Views: 2,793
10-19-2016, 06:45 PM
40. ### Balance in covariates in randomized trials

Hi, I am new to this forum and have a question regarding randomized controlled trials (RCT). How can you mathematically/statistically derive that...

• Replies: 0
• Views: 2,792
11-05-2016, 09:51 AM
41. ### F-test Analyis HELP

I've just carried out an f-test on excel as I want to perform an independent t-test so I wanted to check the equality of variances. I have always...

• Replies: 4
• Views: 2,791
07-16-2011, 03:45 PM
42. ### MDS with confusion matrix

Hi, I want to run a MDS from some data of close set identification. Therefore, I have a 12X12 confusion matrix and I need to transform it to a...

• Replies: 0
• Views: 2,790
06-23-2009, 07:12 PM
43. ### Analysis of a matched case-control study

Please, i need help on my analysis. It is a 1-1 matched case-control studies. I am willing to pay for the guidance. My deadline is friday.

• Replies: 11
• Views: 2,787
01-27-2014, 10:17 AM
44. ### structural zeros and chi square

Hello, I have been reading a little bit about structural zeros and chi-square goodness of fit tests. I've not been able to find a clear answer...

• Replies: 2
• Views: 2,784
12-05-2015, 03:48 PM
45. ### Testing Research Hypothesis

Hi All, I would like to ask about the best method to test the hypothesis research. I have 2 ethnic groups (both gender) and I want to know the...

• Replies: 4
• Views: 2,783
11-15-2011, 08:59 AM
46. ### I'm Confused, simple question...

Hello all. I was reading a friend's dissertation and came across something that left me a bit perplexed. In his study, he stated that there...

• Replies: 3
• Views: 2,781
10-15-2009, 03:56 PM

I am an elementary school teacher and know next to nothing about statistics. It's been over 15 years since I was in a statistics class. I am working...

• Replies: 1
• Views: 2,777
02-21-2009, 05:37 PM
48. ### I need help in my undergraduate project

Hi all, I have conducted a questionnaire about factors affecting academic performance my sample size =300 students from different colleges...

• Replies: 9
• Views: 2,776
11-28-2011, 06:23 PM
49. ### Repeated measures ANOVA + multiple comparisons corrections

Hello everybody, I had a question in regards to ANOVAs and multiple comparisons corrections (Bonferroni mostly). I am running a 3 way repeated...

• Replies: 0
• Views: 2,774
02-13-2011, 09:12 PM
50. ### is it possible to have multiple mediators that all fully mediate

I have a situation where I found my two mediators are both full mediators Does it make sense? I would think there should be only one full mediators...

• Replies: 1
• Views: 2,772
02-14-2009, 03:15 AM
51. ### LISREL Problem with SEM's

Could someone please help me whether it is possible to calculate a path diagram in LISREL that is designed as follows: Independent variables:...

• Replies: 0
• Views: 2,771
02-23-2012, 06:20 AM
52. ### Meta-analysis - can I combine/use these studies?

Hi! I'm trying to set up a meta-analysis with my thesis partner and we ran into trouble which our supervisor isn't able to solve. So I figured...

• Replies: 3
• Views: 2,771
03-04-2014, 05:04 PM
53. ### Can anyone help me choose appropriate form(s) of analysis?

Hi, I was wondering if anyone could possibly help advise me on choosing an appropriate form of analysis I have 2 groups of participants....

• Replies: 6
• Views: 2,769
10-23-2014, 03:35 AM
54. ### How to calculate ARIMA(1,0,1)

Hello, I want to forecast the 101th data of a time series and my data is as follow 99) 0.96 100) -0.2495 101) ? and my model Coefficients: ...

• Replies: 1
• Views: 2,767
03-12-2013, 02:17 AM
55. ### Can't find a convenient test for this huge dataset :-(

Hi everyone, I have some trouble choosing the right test for the following study: I have a group of parents and a lot of ordinal measures. I...

• Replies: 0
• Views: 2,765
05-12-2009, 08:55 PM
56. ### 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: 2,759
12-08-2008, 07:41 AM
57. ### Paired Data

Hi All, I have some paired data (pre and post test on the same subjects) I did a paired t-test to test the means. Now I want to look at...

• Replies: 2
• Views: 2,759
11-14-2010, 08:58 PM

Page 17 of 54 First 1 2 3 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 ... 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.