1. Announcement:
Dason ‎(Devorador de queso)
05-10-2017
Views:
1,950
+ Post New Thread
Page 5 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 ... Last
Threads 241 to 300 of 3194

# 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: 18,785
10-11-2014, 12:02 PM
1. ### By-item random intercepts--to include or not to include?

We're hoping someone can shed light on this one... :) In experiments involving human subjects, samples are taken from the population. The same can...

• Replies: 1
• Views: 2,936
01-01-2010, 02:46 PM
2. ### What specific type of GLM to use?

I'm trying to figure out what type of distribution (Poisson or binomial) to use to measure differences in proportions using logistic glm. Basically I...

• Replies: 2
• Views: 1,392
03-13-2017, 04:52 PM
3. ### 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: 2,916
03-19-2013, 12:48 PM
4. ### Statistical justification for Cochrans Q please

Please may someone tell me the proper way to write a statistical justification for a Cochrans Q .. By any chance is it the same a t-test? ...

• Replies: 4
• Views: 1,451
12-29-2013, 06:57 PM
5. ### Wilcoxon (SL) Regression - Confidence Intervals on Parameter Estimators?

Does anyone know of a method to create confidence intervals on the SLR parameter estimates of a Wilcoxon Regression model?

• Replies: 1
• Views: 747
05-24-2017, 09:47 PM
6. ### VAR model definition

Edit: Question Answered. Instead, could you please tell me how can I delete a topic once I post it, if that's possible. Cheers Greetings, I have...

• Replies: 0
• Views: 1,229
04-18-2014, 09:56 AM
7. ### Comparison of two treatments (paired and unpaired)

Hi all! I'm working on my Master thesis and need to make sure I'm not doing it wrong. My research: Are answers to questions a and b...

• Replies: 0
• Views: 1,089
07-19-2014, 03:02 AM
8. ### 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: 2,702
12-07-2016, 01:44 AM
9. ### relating continuous data to discrete data.

I’m not a statistician, but a mathematician assigned to solve problems of engineering applications. However, recently I’ve come across some problems...

• Replies: 0
• Views: 1,667
09-12-2012, 12:23 PM
10. ### Post hoc analysis: how to determine if sample size was sufficient and level of power

Having difficulty downloading statistical sample/power calculators and have no allocated stats help. Need to find out the following: 1. ...

• Replies: 0
• Views: 1,806
10-26-2012, 05:06 AM
11. ### Estimating likelihood of normal distribution mean shift after N samples

First off, sorry if this post is in the wrong place. Please feel free to point me to the right place to post. The scenario is as follows: I have...

• Replies: 6
• Views: 2,470
06-12-2013, 10:39 AM
12. ### True mean and the Central Limit Theorem

I've learned some pretty remarkable things about the Central Limit Theorem and the so-called Sampling Distribution of the Sample Mean. But there's...

• Replies: 3
• Views: 1,324
06-15-2013, 04:21 PM
13. ### Two-step PPS stratified sample: how to choose additional respondents?

Hello, I find nothing in the literature on how to deal with this, so here goes. We have a relatively complex sample, and we need to acquire...

• Replies: 0
• Views: 4,329
03-11-2011, 03:46 AM
14. ### Help!SEM fitting index all failed,tho reliability and validity test passed.Reason?!

Dear all brilliant members, I am a new analyzing thesis data. Im conducting a survey about people's behavior intention, but i came into a serious...

• Replies: 0
• Views: 1,610
08-17-2011, 07:17 AM
15. ### Help about kappa coefficient?

Is it acceptable using kappa coefficient for examining intra-rater agreement? or which statistical measurement do you prefer to use for...

• Replies: 0
• Views: 940
05-05-2013, 05:02 PM
16. ### Trying to compose a single probability value from sampling an "online" source

Hi, First at all, the presentations: I have recently found this forum surfing the web, and it seems very very interesting and helpfully for an...

• Replies: 1
• Views: 1,282
10-24-2012, 06:33 AM
17. ### Bayesian inference, MAP and sampling (Gibbs)

Hi all I'm applying bayes inference to a GMM, based on some data set. I'm using Gibbs sampling to get the "samples" from the posteriors (the mean's...

• Replies: 6
• Views: 4,960
04-17-2011, 09:30 PM
18. ### Cramer's V

Hi all, Just have a question about Cramer's V. I'm doing some analysis on education levels of partners; male partners vs. female partners. In the...

• Replies: 2
• Views: 1,542
05-21-2015, 09:05 PM
19. ### Incorporating correlation between parameters using variation-covariance matrix

Hi all, My colleagues and I are working on a project (i.e., health economics model) where we have fitted parametric curves (using Weibull,...

• Replies: 0
• Views: 1,335
07-07-2014, 03:40 PM
20. ### What type of analysis??

The purpose of my experiment was to study how ultraviolet radiation effects the quality of eggs. My explanatory variables are: 1) The distance at...

• Replies: 1
• Views: 2,081
03-29-2011, 07:11 PM
21. ### statistical significance and number of experiments required

Hi all I have a n*3 matrix. I add guassian noise with mean 0 and SD 1 to this matrix ... My hypothesis is that this noise does not change a...

• Replies: 3
• Views: 2,321
07-14-2011, 01:04 PM
22. ### Meta-analysis for Pre vs Post (Which SD to use)

Hello everyone, I have extracted data from longitudinal studies that have collected data on pre and post time points. All studies have same time...

• Replies: 3
• Views: 184
10-16-2017, 07:58 AM
23. ### Statistics of Rating

In a website, albums are ranked based on users' input. Each user selects some albums to rate, giving each album a whole number between 1 and 10. I...

• Replies: 0
• Views: 1,408
10-02-2013, 08:59 AM
24. ### reverse causality and endogeneity problems

Hi all, I am trying to analyse the effect of the sex of a CEO (female vs male) on a performance measure of two types of firms (Conglomerate and...

• Replies: 1
• Views: 1,442
03-23-2017, 12:55 PM
25. ### Is AR(1)-ARCH(1) covariance stationary?

I'm becoming confused by this. Say I have the following model: I know that an AR(1) is covariance stationary if |\phi|<1. I also know...

• Replies: 1
• Views: 1,918
11-14-2015, 07:29 PM
26. ### Likert scale - questionnaire administered twice - longitudinal study

Hi, I am running a longitudinal study which lasted for few months during which all participants used a specific communicaiton device. I conducted...

• Replies: 1
• Views: 3,045
04-22-2011, 06:34 PM
27. ### Is there any effect if i change the column value in Minitab Taguchi DOE design??

Hello all, I am trying to design Design of Experiment using Minitab statistical software using Taguchi approach. I have 3 level and four factors....

• Replies: 0
• Views: 930
08-30-2013, 11:57 AM
28. ### Hypothesis Testing question. Is it Null or Alternative? More details.

Hello. I'm new here and its going to be my first thread(excluding my introduction thread). I hope I'm posting this thread on the right section. ...

• Replies: 1
• Views: 3,062
10-03-2011, 04:39 PM
29. ### 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: 20,324
05-03-2009, 07:26 AM
30. ### question about 3 variables

Good evening good people, I hope to get some help and good advice from you. The problem is follow: 1. I have one big questionnaire with...

• Replies: 0
• Views: 1,676
02-25-2013, 02:18 PM
31. ### Am I applying this Chi-squared test correctly?

Hi everyone! I am a history grad student and I am trying to use some statistics in one of my papers. I am working with a certain (ancient) text...

• Replies: 4
• Views: 1,793
06-16-2013, 08:53 PM
32. ### Principal Components Analysis

Hello everybody, I have 15 time series consisting of returns on classic asset class investment (Stocks, Bonds, etc.) and some more advanced...

• Replies: 0
• Views: 1,068
08-22-2014, 08:45 AM
33. ### Analysis of Categorical Data

Hello friends, I'am doing intermediate statistics for second year and I'am having some issues with this chapter. My professor told...

• Replies: 0
• Views: 3,247
03-06-2011, 04:44 PM
34. ### Goodness of fit test for categorical data with non-negative real numbersca

An experiment that I conduct has 5 outcomes: A, B, C and D. I conduct 12 trials for this experiment. I observe, for example: Outcome : Frequency...

• Replies: 2
• Views: 1,518
07-14-2016, 01:13 AM
35. ### Bonferroni Correction Factor !!!

Hello, What exactly Bonferroni correction factor means? Why we calculate it in our study? Thanks, Bala

• Replies: 9
• Views: 25,781
07-14-2009, 06:33 AM
36. ### Anova with data reduction? (Experimental design)

Hi, this is my first post, I hope to do nothing wrong like posting in the wrong area.:pag It happens that I did an experiment where I have a...

• Replies: 4
• Views: 2,041
03-03-2017, 01:37 AM
37. ### Age-Matching Groups Who Differ on Age

I have two groups of children, A and B. Group A is the treatment group and has an age range of 5-7 years old. Group B is the control group and has an...

• Replies: 4
• Views: 5,846
11-06-2008, 02:17 PM
38. ### Composite Scores - Approaches to Missing Data

I have some data from an assessment form that has 25 items, all on a 5-point scale. What I'm looking at is the sum of these items. For a few...

• Replies: 6
• Views: 6,626
12-12-2008, 09:43 AM
39. ### Comparing Improvement Between Groups - Best Approach?

Perhaps this is an easy issue, but I wanted to throw it out anyway. I'm working on a dataset where there are two groups, both having pre- and...

• Replies: 3
• Views: 4,069
01-14-2009, 10:27 PM
40. ### Help understanding separate- and joint- factor analyses in CFA and ESEM

Folks, I am reading an article that tested 2 models--one with an hypothesized separate-factor relationship between five pairs of personality...

• Replies: 2
• Views: 2,130
02-03-2017, 10:43 AM
41. ### Bayesian updating or...?

Hi There, I'm new to this forum and also not an experienced statistician but I have a question. In my research I'm facing a problem that...

• Replies: 0
• Views: 1,283
04-18-2012, 10:18 AM
42. ### Anova?

Hi I have a question regarding statistical tests. Assume that I have to run a program 5 times (5 iterations) and each time it gives me some...

• Replies: 0
• Views: 1,089
03-10-2017, 06:38 PM
43. ### Multiple Measures (Different Variables) from Same Subjects

Hi all! This is my first post. I hope someone can offer advice! I have a student with a seemingly simple analytical problem but I cannot...

• Replies: 2
• Views: 783
07-17-2016, 10:44 AM
44. ### Mass significance – information criterion

In search for the ’best’ linear regression model with 10 potential predictors I calculated the Schwarz Bayesian Criterion (SBC) for every possible...

• Replies: 0
• Views: 50,219
03-13-2012, 04:25 AM
45. ### Research using Fisher's Exact Test

I'm writing a paper based on published, stats data. I'm looking for a real research example of where Fisher's exact test is used on an extremely low...

• Replies: 0
• Views: 2,329
04-23-2012, 09:10 PM
46. ### Comparing two overlapping samples in a tracking study

I have a quick query about measures of sample accuracy in a tracking study with an overlapping (common) sample, and couldn't see anything here...

• Replies: 0
• Views: 1,378
05-14-2012, 01:19 AM
47. ### bounded pareto distribution

please any one can help me about the inversion method that is used to form a bounded pareto I can't understand the inversion method that is used in...

• Replies: 1
• Views: 2,138
BGM
12-20-2014, 04:25 PM
48. ### 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: 5,752
06-26-2010, 04:52 AM
49. ### How to calculate sample size with low event frequency

How do I calculate the sample size with a really low event frequency. I have a population of 2^32 with an unknown distribution. But a event...

• Replies: 1
• Views: 1,885
11-17-2012, 01:40 PM
50. ### Help: relationship between Regime type and war

Hy guys, i have a question and it's really important. I have to study the relationship between regime type and intrastate war. the dataset from...

• Replies: 0
• Views: 2,500
04-08-2009, 10:21 AM
51. ### Bayesian: Defining priors from *same* data set you're modeling

I believe that it is inappropriate to define prior distributions based on the same data you will be analyzing with those priors. In other words, the...

• Replies: 1
• Views: 2,535
09-22-2011, 07:47 PM
52. ### Bayesian Modeling Question

:rolleyes:

• Replies: 3
• Views: 1,412
02-07-2013, 11:44 PM
53. ### population normally distributed, sample not, parametric test allowesd?

Hi guys, Imagine I know that my variable of interest (say blood glucose) is normally distributed in the population. But I have a small sample and...

• Replies: 8
• Views: 18,234
02-19-2011, 07:26 PM
54. ### determening normality in repeated measures ANOVA

Hi guys, I'm not entirely clear on how to determine if the normality assumptions of a test are satisfied. I'll put my question in a step by step...

• Replies: 6
• Views: 19,600
07-19-2011, 05:11 AM
55. ### linear mixed model in SPSS - how?

Hi guys, Imagine a nonrandomized trial with 2 groups (control and treatment) and two time points (pre and post). An ANOVA of change seems superior...

• Replies: 2
• Views: 18,845
02-25-2011, 02:56 PM
56. ### Customer problems vs R&D efficiency -> Statistic needed

Hi guys, I have one case for which I need to find out how to prepare some statistic but to be honest I do not now how to approach the issues. ...

• Replies: 1
• Views: 1,039
11-24-2012, 07:55 AM
57. ### Multivariate Analysis assistance needed

I have conducted a survey on online privacy sensitivity. Part of the survey used a previously-proven instrument to generate a Privacy Sensitivity...

• Replies: 4
• Views: 3,463
10-14-2008, 07:42 PM

+ Post New Thread
Page 5 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 ... Last

#### Thread Display Options

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.