1. Announcement:
05-10-2017
Views:
1,784
Page 4 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 ... Last
Threads 181 to 240 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: 18,638
10-11-2014, 12:02 PM
1. ### pairwise test PERMANOVA does not give t and p values for some comparisons

Dear All, Another question that me and my collegues/ professors cant answer, and maybe one of you can give some ideas. some introduction: I am...

• Replies: 1
• Views: 7,272
05-04-2012, 09:05 PM
2. ### Response ratio

Hi there, I want to explore the possibility of using meta-analysis statistics for prediction of various scenarios. I came across a...

• Replies: 3
• Views: 7,238
05-07-2013, 11:10 AM
3. ### (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: 7,225
08-09-2013, 04:35 PM
4. ### Why use Kruskal-Wallis?

Hi, I am putting together a course on inference techniques to use when the predictor variable(s) are categorical (ie. have no meaningful order). ...

• Replies: 9
• Views: 7,213
08-13-2012, 03:14 PM
5. ### Factor Analysis vs Correspondence Analysis

I was just reading about Factor and Correspondence Analysis. I am a bit confused from the time I realised that Correspondence Analysis also uses...

• Replies: 1
• Views: 7,209
12-27-2010, 05:00 AM
6. ### 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: 7,198
07-08-2013, 11:38 AM
7. ### (non-)parametric test dilemma

I want to compare means of 6 variables and to do correlation analysis. I did Kolmogorov-Smirnov test and it showed that 3 of them are normally...

• Replies: 7
• Views: 7,183
06-22-2009, 07:50 PM
8. ### Hey Guys I'm new and I need help

So basically, I have a very little knowledge about using SPSS, but I'm willing to learn. The problem is I'm having hard time on how to organize the...

• Replies: 19
• Views: 7,155
02-03-2012, 01:00 PM
9. ### paired anova for lack of a better word advice please

Dear All i am stuck at the moment between a rock and a hard place. the short of the story is this. I have 84 petri dishes each containing 4 lines...

• Replies: 15
• Views: 7,096
08-14-2010, 08:41 AM
10. ### How do we compare medians?

Hi, I have a project whereI have to compare short term and long term medians of a given data over four not consecetive years, like 1999, 2007,...

• Replies: 2
• Views: 7,089
12-04-2010, 04:43 AM
11. ### 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: 7,086
06-19-2009, 03:17 AM
12. ### T-test help with determining whether its 1 or 2 tailed?

Hi, I need to perform a t-test to determine the relationship between US govt spending on Police and the number of Rapes annually. So I have 53...

• Replies: 10
• Views: 7,083
02-28-2012, 02:31 PM
13. ### Working With Population Data

Is there a way to determine if a difference is significant when using entire population data? For example if i see that the difference between test...

• Replies: 9
• Views: 7,061
09-23-2010, 05:12 AM
14. ### Repeated k-fold Cross-Validation

I saw this: "Any advices on practice? It depends on the data, but it's common to find examples cases 10 fold CV, plus repetition: 10 fold CV,...

• Replies: 12
• Views: 7,061
12-16-2016, 10:35 AM
15. ### repeated measures MANOVA on mixed design

Hi folks, I have data from a drug study that I am trying to perform statistical analysis on, and am not sure if my approach is correct. I was...

• Replies: 0
• Views: 7,018
08-30-2010, 03:24 PM
16. ### Eigenvector for large matrices

Well, this is kind of a linear algebra question, but is used very often in statistics, so it seems applicable for this forum. My question is, does...

• Replies: 11
• Views: 7,001
07-01-2008, 01:58 PM
17. ### Contingency tables with an expected value of 0

Hi all. I would like to compare two contingency tables (expected and observed). Unfortunately, one of my expectancy cells is 0, which rules out a...

• Replies: 6
• Views: 6,986
03-21-2011, 01:34 AM
18. ### Hartigan's Dip Test for Bi-Modality: Rejecting surprising distributions

Hi, I'm new here. Thanks for providing this forum! I'm checking some separate sample distributions for bi-modality since most but not all of them...

• Replies: 1
• Views: 6,972
12-29-2011, 08:05 PM
19. ### Stats for whole population data

Hi all - I'm an employee of a government department who has been asked to answer some question to do with a whole population data set. In short, here...

• Replies: 8
• Views: 6,954
01-04-2010, 11:13 AM
20. ### finding UMVUE

let X_1,X_2,.....X_n be a random sample from f(x;\theta)=\frac{e^{-|x|/\theta}}{2\theta}, -\infty<x<\infty Find UMVUE of \theta^r help needed...

• Replies: 3
• Views: 6,926
BGM
11-13-2010, 01:44 PM
21. ### Multicointegration - alternative variable?

Time series: For example, if a dependent variable only have 17 observations could I replace it with something with more data if I want a rough...

• Replies: 0
• Views: 6,826
07-19-2010, 07:31 PM
22. ### Greatly unbalanced sizes of samples for Mann-Whitney U test.

Hello, I want to compare two independent samples and by doing a little research I have concluded that the Mann-Whitney U test is the most...

• Replies: 1
• Views: 6,820
12-02-2010, 05:55 AM
23. ### hypothesis testing for least squares fitting

I have a spectrum that is composed of several things. I do least squares fitting in order to determine the amount of each component. For example: ...

• Replies: 8
• Views: 6,807
03-02-2009, 10:30 AM
24. ### time variables in a regression

Hi all, I'm looking at a linear regression model using the data on wars in the 20th century. There are two time variables on the right-hand...

• Replies: 2
• Views: 6,796
07-29-2008, 12:15 PM
25. ### Expected Value

A list of n items is arranged in random order; to find a requested item, they are searched sequentially until the desired item is found. So, how will...

• Replies: 9
• Views: 6,784
05-08-2010, 05:29 AM
26. ### What is the proper way to divide a skewed dataset into high, medium, and low interval

I don't know if this is the proper forum for this. Hello, I have a skewed dataset, and I am dividing it into high, medium and low values. I don't...

• Replies: 2
• Views: 6,773
01-24-2011, 11:37 AM
27. ### PCSE vs FGLS method for analyzing panel data

Hi, Some guidance on the below inquiry would be much appreciated as I am having a hard time finding someone who is faimiliar with the PCSE and...

• Replies: 0
• Views: 6,703
03-02-2010, 04:44 PM
28. ### Repeated measures anova or t test

Hi, The question I have is about which test I could use for the following case: - two groups (an experimental and a control group) - two measures...

• Replies: 3
• Views: 6,703
01-08-2011, 12:43 PM
29. ### What to do when number of variables is greater than number of observations?

What are some techniques that are utilized when the number of predictors is greater than the number of observations?

• Replies: 15
• Views: 6,703
02-15-2013, 02:36 PM
30. ### best way to use Cronbach's alpha?

I am making my first foray into survey based research. A quick question or two about Cronbach's alpha: My survey included questions about...

• Replies: 1
• Views: 6,679
06-07-2010, 03:55 PM
31. ### compute true values monte carlo simulation

Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

• Replies: 16
• Views: 6,662
07-04-2010, 05:19 AM
32. ### Can anyone explain Poisson regression for doing time trend?

It would be a big help if someone could give a practical example (by hand) how Poisson regression is used to calculate a time trend line, and...

• Replies: 12
• Views: 6,660
02-19-2014, 06:52 PM
33. ### Numeric algorithm to compute probability for Beta Binomial

Dear all, I am trying to find a numeric method that can be handled at least by Excel to compute the probabilities of Beta Binomial distribution....

• Replies: 2
• Views: 6,624
09-26-2010, 03:48 PM
34. ### 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: 6,616
11-30-2011, 04:36 PM
35. ### Correlation Proof

Hi guys, wondering if you could help me with a proof that I am trying to figure out. Here it is... Corr (A, B) = 0 and Corr (B, C) = 0. This...

• Replies: 7
• Views: 6,591
10-07-2010, 03:34 PM
36. ### 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: 6,572
12-12-2008, 09:43 AM
37. ### error on percentile estimation

Hi all, I have a problem that I need help on please. I have some 1000 samples from an unknown distribution, from which I wish to derive various...

• Replies: 2
• Views: 6,509
08-17-2010, 06:01 AM
38. ### How do I report marginal means of a two-way unrelated ANOVA correctly? APA-style

Hello, after doing a two-way unrelated ANOVA (General Linear Model > Univariate) on SPSS, I am confused how to report the output correctly. My...

• Replies: 0
• Views: 6,463
08-21-2011, 05:46 PM
39. ### 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: 6,460
10-07-2008, 01:00 PM

Hello I am working with a likert scale with response ranges from 1-5. A score of '3' indicates a neutral response. I want to calculate whether,...

• Replies: 5
• Views: 6,457
10-06-2008, 07:40 PM
41. ### How to obtain individual factor scores after PCAs on multple imputed datsets???

Hello, I really hope, someone here can help me, I've searched the internet for hours and could not get any clue on how to solve my problem. I...

• Replies: 14
• Views: 6,445
05-09-2015, 07:04 AM
42. ### Equivalent to RMSE for logistic regression?

I understand that RMSE is a useful summary measure for assessing predictive power of regression model with continuous dependent Y. Is RMSE equally...

• Replies: 1
• Views: 6,435
08-09-2011, 10:54 AM
43. ### Variance estimation

A simple question we have a random sample n=2 with X, Y drawn from a normal distribution N~(0, \sigma^2). Is V=\frac{X^2}{2}+\frac{Y^2}{2} a...

• Replies: 21
• Views: 6,426
11-01-2010, 06:42 AM
44. ### Does anybody have a calculus example for Bartlett and Levene tests?

Recently I had this idea, to study noise in fx markets. I wrote my own statistics library, and when I started to apply tests I noticed that the tests...

• Replies: 14
• Views: 6,389
09-07-2010, 05:59 AM
45. ### Help correlating Likert scale data with demographic profile

I'm not knowledgeable about statistics, so please excuse any mistakes in phrasing. Our professor is currently on leave, and I don't have anybody else...

• Replies: 4
• Views: 6,379
10-12-2010, 10:20 PM
46. ### an event study? I can't stand. which way should I choose?

Please a little help. There is an event. You can think a government interference . So, price of firms is decreased and therefore quantity of...

• Replies: 3
• Views: 6,344
01-02-2011, 06:15 PM
47. ### Sample size for repeated measures or dependent-sample t

Hi John: I have another question. I collected these data from parents and their children about children's chronic condition. I wanted 100...

• Replies: 1
• Views: 6,327
02-18-2006, 02:27 PM
48. ### Best method to analyze mediation and moderation with ordinal data?

Hello! I'm new here (and to statistics as well). I could use your advice about how to analyze the data for my master thesis. The first part of...

• Replies: 7
• Views: 6,317
05-24-2013, 11:26 AM
49. ### Interpret statistical data - Relative risk, power, and significance?

"We estimated that a sample size of 1240 patients followed up for an average of 3 years would lead to detection of a 33% difference in the relative...

• Replies: 4
• Views: 6,244
08-28-2010, 03:53 AM
50. ### testing rates through time

Hello all, this seems like it should be a simple questions but our team cannot find an answer to the question. If I have data set up like the...

• Replies: 18
• Views: 6,210
10-13-2011, 09:04 AM
51. ### Interactions in R and posthocs (lmer model)

Hello there, here's a question about interactions. Let's just say you have the variables Diagnosis with two levels LI (language impaired) and N...

• Replies: 1
• Views: 6,208
10-20-2009, 10:51 PM
52. ### Test for difference between ratio of means, unequal variance.

Hello there, I an experimental design were I wish to test if the effect of a treatment on several subjects type is different to the effect of...

• Replies: 5
• Views: 6,202
09-29-2015, 11:58 PM
53. ### Why does a model with an interaction has to include the interaction main effects?

:wave: Hello fellow stats talkers, If we are only interested in an interaction, I was wondering why a model with a significant interaction also has...

• Replies: 1
• Views: 6,187
11-11-2009, 08:52 AM
54. ### Rolling or continuous surveying or sampling

I have been looking everywhere for an answer to this problem, so far with no luck. Hopefully the statistics gurus on this board will know the...

• Replies: 0
• Views: 6,167
04-08-2011, 06:50 AM
55. ### Youden Index

Hello, I am doing some ROC analysis comparing grading scales for intracerebral hemorrhage. My question is - can the Youden Index be considered a...

• Replies: 0
• Views: 6,131
06-23-2010, 02:51 PM

Page 4 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 ... 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.