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# 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: 18,756
10-11-2014, 12:02 PM
1. ### cramers v and level of significance interpretation

Hey guys :) I have been searching for hours in books, forums and on the internet but I can't find answers to my questions, so you are my last...

• Replies: 1
• Views: 5,524
08-25-2013, 01:12 AM
2. ### how to determine the sample size needed for logit model

how to determine the sample size needed for logit model? we are currently working on a thesis.

• Replies: 1
• Views: 3,461
08-03-2011, 12:12 AM
3. ### 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: 1,059
08-01-2013, 03:43 AM
4. ### Help With The Preffered Package Type Assessment

Hello there to everyone! I have the question concerning the underlying data analysis methodology. Here is the small introduction. There is a data...

• Replies: 2
• Views: 1,392
11-15-2012, 12:45 PM
5. ### Estimation of suitable significance level for high numbers of experiments

I am a scientist and work with high numbers of experiments. For example: I have tested 1000 different parameters between 2 groups. I found 10...

• Replies: 0
• Views: 1,054
06-13-2016, 11:37 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: 995
07-08-2013, 03:22 AM
7. ### Raw Data vs Frequency Distribution

Hi, I am new here, please discuss this given below. “Why an average computed from a frequency distribution is not exactly the same as...

• Replies: 6
• Views: 5,921
05-11-2015, 07:48 AM
8. ### 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: 2,680
08-14-2014, 02:35 PM
9. ### grouing variable,likertscale firm,performance,multvariate analysis

My research is aim to investigate the mechanisms through which IT influence sustainability of competitive advantage. The data is collected through...

• Replies: 0
• Views: 1,305
12-11-2011, 05:45 PM
10. ### comparing means\unequal(small) size group

Hi, I am about to use student t test to compare the mean of two independent groups. The first group sample size is 4 and another one is 24. Can I...

• Replies: 4
• Views: 26,373
08-18-2009, 12:00 AM

So I am comparing 2 imaging techniques and correlating their results for calculating bone mineral density in the knees. One is called DEXA which is a...

• Replies: 2
• Views: 1,206
04-17-2013, 05:13 PM
12. ### Cut-off

I am reading an article where 5 has been set as a cut-off score. No > or >= symbols are given, and I don't know whether a score of 5 would identify...

• Replies: 0
• Views: 2,550
05-12-2009, 08:03 AM
13. ### On what statistical significance test should I use

Hi everyone, First and foremost, my skills in statistics are quite basic so what I am about to ask may sound very stupid. That being said, here...

• Replies: 7
• Views: 2,265
08-24-2011, 01:33 PM
14. ### AOV-How worried do I need to be about non-normal and unequal residuals

I am working on a 3 by 8 factorial design with limited replication (5). I was handed this data set by someone who left my department and want to see...

• Replies: 0
• Views: 2,245
11-02-2011, 12:59 AM
15. ### Goodness of Fit Applicability

I'm Looking for some advice on comparing the results of two different sampling methods (sampling the same population) against each other. The two...

• Replies: 2
• Views: 1,232
02-13-2013, 05:09 PM
16. ### Gamma Poisson Mixture with finite Gamma

Dear all I am working with a Gamma-Poisson mixture distribution where (and this is not usual) the support of the Gamma distribution (in fact, I am...

• Replies: 0
• Views: 1,677
11-30-2012, 06:49 AM
17. ### Low population hypothesis testing

Hi, I'm doing statistics for a friend of mine. Problem with the data is that there are only 64 responses. Questionnaire was distributed to a...

• Replies: 4
• Views: 3,549
11-16-2010, 06:28 AM
18. ### Subspace clustering

Hello, Could you recommed me book about subspace clustering?

• Replies: 0
• Views: 1,082
03-12-2014, 04:42 AM
19. ### Moral Dilemma Scenarios - How to measure different options?

In a survey sent to business school students I want to measure predictors of ethical behavioral intentions. I have several latent independent...

• Replies: 0
• Views: 1,453
08-31-2014, 10:10 AM
20. ### Friedman test...

I really hope someone can help as I am a bit lost and my knowdledge in statistics is very basic. I have done an experiment in which I have...

• Replies: 0
• Views: 1,546
ARI
10-18-2011, 10:12 AM
21. ### Need help on SEM analysis using AMOS

After defining my model when I run the analysis, it gives me a message that "The specified model is probably unidentified. In order to achieve...

• Replies: 1
• Views: 13,429
06-04-2012, 12:31 PM
22. ### Which statistical analysis technique to use in my research

Hi Everyone, My research contains the following 1. Multiple independent input variables. 2. One dependent variable. 3. All the variables are...

• Replies: 0
• Views: 1,047
04-12-2013, 09:00 AM
23. ### Appropriate Statistical Analysis

Hello, I am getting ready to take comprehensive exams for my Master's Degree and have not had statistics in four years. I need some assistance in...

• Replies: 4
• Views: 4,038
03-04-2009, 12:39 AM
24. ### correlation method for latent variable

Hi! I have several dichtomous variable which are latent and normally distributed. When I calculate correlation with two of these variables I ought...

• Replies: 0
• Views: 832
02-05-2014, 03:10 AM
25. ### Correlation of two dependent variables

Hi all! I have a small data set which contains two tissue samples from ~20 patients. Each patient has contributed a tissue sample from left and...

• Replies: 0
• Views: 2,219
05-09-2014, 01:26 AM
26. ### Wilk s theorem and LR test

Hello, I have first posted the following in the "Statistics help" section, but it might be that it is better to post it here. I have some...

• Replies: 2
• Views: 3,659
03-30-2012, 09:56 AM
27. ### too large p-value

Hi, I have a problem of interpretation of some results. The problem is the following: I have a model with 4 parameters I have N=55 data...

• Replies: 1
• Views: 2,568
12-01-2012, 07:57 AM
28. ### 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: 2,779
08-25-2008, 11:05 AM
29. ### Mann-Whitney U Test for non random sample

Hi I've got too groups Success and Failure I've got four sample populations in different industries that i've ranked by a measure of success. ...

• Replies: 2
• Views: 3,415
01-20-2011, 03:31 AM
30. ### problem with calculating total score on SPSS

Hi everyone, I am having a problem with calculating total scores for my measuring instruments on SPSS. If a case has a missing value on one item...

• Replies: 1
• Views: 1,998
04-21-2015, 08:16 AM
31. ### Three parameter Weibull confidence intervals

I am using the Weibull distribution for reliability, mainly related to material fatigue. For the two-parameter fitting, there are methods for...

• Replies: 0
• Views: 1,314
07-03-2015, 09:45 AM
32. ### Convergence in LLN and CLT help!

Hi there, I am trying to figure out how convergence in law of large number and central limit theorem is affected by correlation in the random...

• Replies: 1
• Views: 1,259
03-06-2015, 08:34 AM
33. ### Derivation of OLS residuals and asymptotic properties

Hello, Im stuck with this questions. Its asking for the derivation of asymptotic properties of 1/n*(sum of ehat^3) where ehat is the residual of...

• Replies: 0
• Views: 1,014
03-11-2015, 07:45 PM
34. ### Estimating parameters using a different method?

Hi, I have a probability distribution which has two parameters \alpha and \beta I re-parametrized the distribution such that the new...

• Replies: 2
• Views: 1,115
08-16-2012, 08:43 AM
35. ### Need a binary data with high intraclass correlation.

Hi! for my research, in order to compare some new correlated binomial models, I need an empirical data where the binomial binary trials are highly...

• Replies: 0
• Views: 1,274
08-20-2012, 01:49 PM
36. ### Comparing overdispersion distributions

I am dealing with handling overdispersed count data(Poisson distributions fails to fit). I need to compare three different mixtures of Poisson...

• Replies: 0
• Views: 1,442
09-14-2012, 08:28 AM
37. ### Generating Beta binomial random variables

Hi, I am looking for the theoretical method/algorithms to generate beta-binomial random variables. I would like to kindly request you to suggest...

• Replies: 0
• Views: 1,197
11-19-2012, 10:17 AM
38. ### Is it possible to Reduce/Correct Bias through EM algorithm?

I am dealing with few overdispersed count models and using mixed Poisson distributions to deal with overdispsered data. I've used MLE technique to...

• Replies: 0
• Views: 1,176
04-05-2013, 09:00 AM
39. ### Experimental design: ANOVA? help!

Hello, I have to analyze one paramater (lipid content) of seeds from 5 different cultivars. I am planning to do two independent analysis of the...

• Replies: 3
• Views: 1,565
03-05-2017, 09:09 AM
40. ### Okay to Sum Numerical Values of Categorical Variables?

Hi. I have questions regarding categorical variables. Can you create a scaled variable out of several dichotomous variables? For example if I...

• Replies: 0
• Views: 1,347
01-08-2015, 12:17 AM
41. ### 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: 2,739
10-06-2014, 04:41 PM
42. ### suitable statistical method

Hi all, This is my first post here. I have a data (Subset-A) requiring statistical treatment. Descriptive statistics of the data: Size =...

• Replies: 4
• Views: 2,537
10-08-2010, 04:39 AM
43. ### Checking conditional and mutual independence

Hi, I am working on bayesian networks and i am encountering problem in calculation of conditional and mutual independence. My problem is I have...

• Replies: 0
• Views: 1,998
06-04-2010, 05:58 AM
44. ### Calculating weighted mean & SD from multiple group data

I have a query regarding the calculation of a weighted mean +/- standard deviation based on a set of group data containing means and standard...

• Replies: 2
• Views: 4,775
asf
11-21-2012, 07:47 PM
45. ### 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: 2,860
03-27-2013, 02:30 PM
46. ### Nonparametric methods

If I have a sample with the size of the right and left arms of each of these people.So I have two dependent groups, since these are the same person,...

• Replies: 10
• Views: 2,510
12-16-2014, 06:30 AM
47. ### test whether 2 mean scores are significantly different

I have two groups of participants; 1 group received treatment A and the other group received treatment B. I have the mean scores of the effectiveness...

• Replies: 9
• Views: 9,937
06-22-2011, 03:09 PM

How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

• Replies: 3
• Views: 8,820
06-22-2011, 05:55 PM
49. ### Uncertainty in Sample Dispersion

I'm an astronomer and I have a statistics question that I'm not sure how to answer. I'll try to generalize the problem in a clear way. I have a...

• Replies: 1
• Views: 3,369
10-12-2010, 06:05 PM
50. ### Help w/survey results!

I am hoping someone can help me figure out how to do the following: I am a member of my child's school's accountability committee, and as such we...

• Replies: 4
• Views: 3,535
04-08-2011, 04:05 PM
51. ### Post hoc test

I want to run a post hoc test along with my MANOVA, but I don't know which post hoc test to run. I am looking at the difference in prey preference...

• Replies: 1
• Views: 3,032
03-25-2010, 04:24 AM
52. ### Plot Characterization

Hi all, I am plotting voltage errors (Y) vs positions (X) X values are always sequential and ordered ascending I am concerned primarily with...

• Replies: 0
• Views: 1,431
09-08-2014, 10:22 AM
53. ### 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: 6,243
10-20-2009, 10:51 PM
54. ### 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: 6,248
11-11-2009, 08:52 AM
55. ### 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: 2,928
01-01-2010, 02:46 PM

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