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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: 19,447
10-11-2014, 12:02 PM
1. ### "Maximally uncorrelated" representation for a covariance matrix

Hi, I have a question about the covariance matrix from a real-life study in particle physics. I am working on a non-linear fit of a...

• Replies: 0
• Views: 2,275
12-20-2008, 08:16 PM
2. ### "significance metrics" for hypothesis testing

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• Replies: 0
• Views: 2,798
p05
08-02-2010, 04:58 PM

Bayesians, puzzle me this: If you are trying to learn the $p$ parameter of a binomial distribution, the least informative prior is the uniform...

• Replies: 1
• Views: 4,100
10-21-2010, 10:55 PM
4. ### 'Mean location/ spot'

I have a design that need to have mean of different spots, in simple term it would be like this. P1 shoot 6 and P2 shoot 8 out of 16 neighboring...

• Replies: 0
• Views: 1,720
07-25-2011, 12:45 AM
5. ### (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: 7,830
08-09-2013, 04:35 PM
6. ### (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: 7,407
06-22-2009, 07:50 PM
7. ### (Reasonable) way to simulate outliers?

hi! so i've been wanting to tackle a project related to Spearman's rho through simulation and i think it would be reasonable to include an...

• Replies: 1
• Views: 1,430
08-08-2014, 02:55 PM
8. ### (URGENT!) Simulating expectations and a conditional expectation

I need to simulate a conditional expectation of the form: E (Xi^2 /(||X||^2 +h) | R^2 = ||X-T||^2 + ||U||^2 , Zi^2= (Xi - Ti)^2) Where X~N(T,I_p),...

• Replies: 0
• Views: 171
10-04-2017, 08:38 AM
9. ### (Using R) What’s the right test to compare for significance?

First of all, many thanks for looking at this post. My problem is partly technical knowledge (or lack of), but mainly one of perception! I’ve been...

• Replies: 0
• Views: 13,751
05-24-2013, 05:47 AM
10. ### *stats analysis help of complaints*

Hi, I have to see if there is a significant difference in number of complaints per person. The data is as follows: A – 22 B - 17 C - 14 D...

• Replies: 0
• Views: 1,738
06-05-2014, 11:40 AM
11. ### 1 group of subjects, two tests

Hi all. I'm a bit confused at the moment, so I'm hoping anyone here can give me a hand :) I've completed a large data collection, using 9...

• Replies: 2
• Views: 1,208
01-29-2014, 09:06 AM
12. ### 1 observation for control group & 3 obs for experimental group

Hello, My background in statistics is quite limited, so I'm searching for help in order to choose which test I should use for my research. I am...

• Replies: 6
• Views: 1,751
03-11-2014, 03:05 PM
13. ### 1 way Anova vs Two Way Anova -HELP needed

I suck at stats and am always confused >.< I have 24 animals. Let's say I have 3 groups of animals (A,B,C) and 8 in each group. Each group...

• Replies: 2
• Views: 3,320
01-05-2017, 09:06 AM
14. ### 10 point scale and central limit theorem

I want to do a comparative analysis between two means of groups. I want to hear opinions on two things. 1. I asked participants to rate me...

• Replies: 6
• Views: 2,778
04-03-2012, 05:20 AM
15. ### 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) – e/(1 +...

• Replies: 1
• Views: 2,756
BGM
01-27-2012, 11:54 AM
16. ### 2 Cubed Experiment

Could some one give me an example of a 2 cubed experiment? I am having trouble thinking about one. I need an experiment to record 2 different...

• Replies: 0
• Views: 1,465
09-09-2012, 03:36 PM
17. ### 2 Dice Rolls vs. 1 Target Number

Hi guys, I hope you don't mind my posting this here. I'm a game designer who needs some help working out probabilities for a dice roll mechanic, and...

• Replies: 3
• Views: 4,430
01-06-2011, 11:09 AM
18. ### 2 or 3 way ANOVA?

Hi I'm not sure whether to use a 2 or 3 way ANOVA. My project I'm working on is focussing on one antibiotic and seeing how toxic it is at...

• Replies: 1
• Views: 1,207
05-26-2015, 07:04 AM
19. ### 2 Sample T Test for Nonnormal data

Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

• Replies: 10
• Views: 2,836
04-09-2013, 07:13 PM
20. ### 2 x 4 Factorial Design and contrasts...

Question... I have a 2 (gender) x 4 (Drug Dose) design Gender - Male - Female Dose - 200 - 400 - 600 - 800

• Replies: 2
• Views: 13,047
11-30-2008, 11:37 PM
21. ### 2x2 Repeated Measures ANOVA

Dear all, I am trying to run a 2x2 repeated measures ANOVA. I have pre and post values for a control, and then pre and post values for an...

• Replies: 4
• Views: 3,295
10-26-2012, 09:02 AM
22. ### 3 Groups of Participants & Likert data

Hi, I'm new to the forum - though I have browsed and found the resources helpful for a long time. Thank you to all who contribute here. I have...

• Replies: 7
• Views: 2,030
11-05-2013, 07:00 AM
23. ### 3 interdependent variables, parametric fit, loss for words

I'm looking for a mathematical description of a data-set, but i have trouble finding the right wording. So i will just describe the situation. I...

• Replies: 0
• Views: 2,462
06-13-2012, 05:29 PM
24. ### 3 way ANOVA with repeated measures... Data entry setup for statistica

Hello all; I am doing a preliminary analysis on some data using STATISTCA, however being new to the software I am having a real difficult time...

• Replies: 1
• Views: 1,550
12-09-2014, 02:24 PM
25. ### 3-Way ANOVA Woes (Levene's Test)

Hi all, I'm doing a study on the amount of a protein found in a brain region after different manipulations. Exercise is thought to increase it, a...

• Replies: 0
• Views: 2,318
03-18-2014, 07:18 PM
26. ### 3x2 design - data analysis ANOVA/MANOVA? How to add interaction in the model?

Hello, Discription of experiment I am researching "The effect of review valence and brand commitment on consumer's purchase intention" for my...

• Replies: 0
• Views: 4,225
04-19-2014, 07:25 AM
27. ### 3x3 factorial design, repeated outcome measure

I have a 3x3 factorial design (3 levels of treatment and 3 different environments) - the outcome is a repeated measurement taken at every week - the...

• Replies: 1
• Views: 2,857
10-07-2014, 02:53 AM
28. ### 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: 2,782
08-14-2014, 02:35 PM
29. ### 95% ci

Hi I am trying to interpret a journal article about the results of whether drinking cokes leads to child hyperactivity, the sample taken from a...

• Replies: 2
• Views: 2,557
10-24-2011, 08:25 AM
30. ### ?is there a test for this?

I have one nominal (disease, no disease) dependent variable and two independent variables I wish to look at regarding whether or not they are...

• Replies: 2
• Views: 2,214
03-28-2011, 08:45 PM
31. ### A basic question. Pls help...

Hi, When discussing the large sample theory, the professor in my econometrics course said sth that I found hard to grasp. He said something...

• Replies: 1
• Views: 2,689
06-15-2009, 08:07 PM
32. ### 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: 2,907
08-25-2008, 11:05 AM
33. ### a completely randomized experimental design and regression

A company studied the effects of three different methods of promotions on sales of its crackers (labeled as Treatment 1 to 3). Fifteen stores were...

• Replies: 1
• Views: 1,938
06-02-2016, 02:38 PM
34. ### a data modeling question

Just had a job interview with a bank. They asked me the following questions: 1. Their credit card offers reward points. They want to predict...

• Replies: 1
• Views: 1,771
03-05-2012, 04:26 AM
35. ### 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: 2,112
07-30-2013, 07:15 AM
36. ### A method to estimate linear regression coefficients when some data is missing

Is there a method to estimate linear regression coefficients when some data is missing, without deleting the records are missing? I know that This...

• Replies: 2
• Views: 1,855
12-23-2011, 12:27 PM
37. ### 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: 6,726
10-07-2008, 01:00 PM
38. ### A Non parametric equivelent to mixed anova?

Hello, I am trying to find a non-parametric equivalent to a mixed Anova? My data is horrible. Three small unequal groups (8, 8, 4) and data...

• Replies: 1
• Views: 5,419
08-14-2010, 09:36 AM
39. ### A power analysis question - am I making a big mistake?

Help! It's a very long time since I have had to tackle Power Analysis but I have recently been handed a couple of problems, one of which I hope...

• Replies: 0
• Views: 2,395
01-01-2010, 05:36 PM
40. ### A question about General Linear Model and random factors

Hi everyone. :wave: I have the following problem. In an experiment I had a number of plants of two developmental stages. I applied a treatment with...

• Replies: 0
• Views: 1,942
04-12-2013, 03:37 PM
41. ### A question about Multiple imputations

If I use multiple imputations to complete missing values in a certain variable, can I later use the imputated variable in another imputation (to...

• Replies: 1
• Views: 1,935
09-08-2014, 08:02 AM
42. ### A question regarding correlation and regression for a seminar

Hello, Im doing a seminar in which the dependent variable is work centrality which is an interval one. the independent variable is age (ratio),...

• Replies: 1
• Views: 3,291
12-25-2013, 04:01 AM
43. ### A question regarding Cronbach's Alpha

Hi everyone. I have been reading that Cronbach's Alpha is used when you need to test consistency of several Likert questions which all try to...

• Replies: 2
• Views: 2,610
01-24-2015, 03:18 PM
44. ### A Quick Question Concerning Repeated Measures of ANOVA.

Hello Everyone! I am working on the capstone thesis project for my Master's degree and hoping for some professional assistance to determine if I...

• Replies: 1
• Views: 2,383
10-19-2011, 12:58 PM
45. ### A simple case that doesn't seem that simple

I've been trying to find the best solution for my experiment. I don't like that much what my colleagues are using for the statistic test here. So I...

• Replies: 5
• Views: 2,292
srd
12-02-2013, 10:34 AM
46. ### A Simple Meta-Analysis query

Hi All, I am working on my first meta-analysis project and this may sound silly, but I am having difficulty deciding which studies to include. ...

• Replies: 0
• Views: 2,535
10-10-2008, 04:50 AM
47. ### A Soccer/Football Ratings System - Home Advantage

Hi guys, this is my first post. (So do lower your expectations) I'm currently writing a thesis that deal with sports probabilities and part of the...

• Replies: 2
• Views: 4,014
09-02-2015, 03:42 AM
48. ### abnormal data, log transform data, still abnormal, what to do?

Hello all, I have a dataset where I want to run repeated measures and I have abnormal data. So I log transformed the data set and it is still...

• Replies: 6
• Views: 2,744
06-20-2013, 02:19 PM
49. ### abnormal returns calculation for over 500 companies(M&A deals)

Hello everyone, I am working on a research project based on abnormal returns in M&A deals. I am looking at last 5 years deals in which both the...

• Replies: 0
• Views: 1,108
08-28-2013, 11:21 AM
50. ### about random walk Metropolis algorithm

Our model is: Y is distributed from a Negative binomial(r,p) where log(p/1-p)=xb. The prior of b is a multivariate normal(mu0,...

• Replies: 3
• Views: 2,340
01-06-2013, 07:50 PM

My manager wants me to do a research about advance purchase day vs. fare. however it involves too many categories, and we have billions of tickets...

• Replies: 0
• Views: 2,338
11-19-2009, 12:05 AM
52. ### About the distribution of confidence interval for Weibull

Does anyone have an idea about the distribution of the 95&#37; confidence intervals for a population with a Weibull distribution? Thanks in advance!

• Replies: 0
• Views: 3,653
03-23-2009, 06:18 PM
53. ### Absolute or relative changes?

I would like to compare the changes in salt excretion caused by a saline infusion in a group of patients studied under high sodium and low sodium...

• Replies: 0
• Views: 3,144
06-16-2009, 04:57 AM
54. ### Accelerated Bootstrap - mediation

Howdy! :tup: Can anyone explain accelerated bootstrap to me? I've got it reported in a research report and I can't really figure it out. ...

• Replies: 2
• Views: 5,287
08-20-2011, 04:15 PM
55. ### Accept Null hypothesis VS Reject Null hypothesis ?

• Replies: 5
• Views: 4,357
12-03-2014, 05:38 AM
56. ### accounting for volunteers giving a survey

When writing about validity/ reliability, how do I take into account volunteers who have given the treatment to the participants rather than myself...

• Replies: 0
• Views: 1,050
05-29-2013, 07:36 PM
57. ### Adding random error to ordinal IV to make it more continous

In survey data, attududinal questions are often coded 1-5, 1-7, 0-10 etc. These kinds of variables are often reffered to as approximately...

• Replies: 2
• Views: 2,806
10-07-2011, 09:37 AM

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