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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: 19,443
10-11-2014, 12:02 PM
1. ### Need good, fast stats help, will pay, help on dissertation, inferential analysis ONLY

I need a stats coach to sort out the inferential stats part of my dissertation - that's all. The SPSS file is done, I have 109 "good" pages of the...

• Replies: 77
• Views: 8,776
02-03-2014, 06:18 AM
2. ### Test of Significance?

I want to conduct a significance test in finding the significance between either a C+ vs a B- in AP statistics class will affect chances of attending...

• Replies: 42
• Views: 8,031
06-24-2011, 06:30 PM
3. ### Feedback on bootstrapping effect size and t-values

I am trying to learn to bootstrap per conversation here the other day. I know there are packages to bootstrap but wanted to process more...

• Replies: 31
• Views: 5,141
04-28-2015, 09:25 PM
4. ### Representing a distance measure with math equation

I'm working on presenting a distance measure at a conference but don't have a publication quality math formula for representing what I'm doing in R. ...

• Replies: 26
• Views: 7,273
11-11-2013, 04:54 PM
5. ### paired samples-equality of variance and 95% CI around difference

Hi, Can a few of you please review the approach I plan to take for obvious errors? I have 50 subjects and each have a measure taken on the same...

• Replies: 24
• Views: 9,189
08-06-2011, 10:29 PM
6. ### Which test to use for my data

Hi, I am not sure which kind of test to use to analyse my data. Can anyone help? I collected 50 snails from 5 different sites & dissected to find...

• Replies: 24
• Views: 4,086
04-22-2013, 02:07 AM
7. ### Help with choosing statistics

Hi! Stumbled over this forum recently, there's so much knowledge here I could just sit and read and read. Anyway, I'm not the strongest in stats so I...

• Replies: 22
• Views: 4,734
11-22-2011, 12:09 AM
8. ### 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: 6,861
11-01-2010, 06:42 AM
9. ### Coding Data

I am examining the relationship between employee level of education and the severity of their disciplinary offenses. I coded education...

• Replies: 21
• Views: 6,136
08-26-2011, 09:30 AM
10. ### finding the standard deviation and mean from frequency table

I have a frequency table showing age distribition in Auckland supercity election 2010 and I have in the coloumns I have Age, frequency, percentage,...

• Replies: 21
• Views: 21,544
11-12-2011, 03:41 AM
11. ### ANOVA n00b questions

Hello! I'm putting together a proposal and would like to conduct a certain type of analysis but my wording on this is rather weak so please correct...

• Replies: 20
• Views: 4,608
11-07-2011, 10:09 PM
12. ### Algebra, two-sample t-statistic, variance

• Replies: 20
• Views: 6,346
08-13-2012, 12:31 AM
13. ### Is it meaningful to calculate a p-value based on a convenience sample?

Ignore the bootstrap as a possibility. If the answer is no, then what is the point of stating the p-value (especially if it is, say, 0.10)?

• Replies: 20
• Views: 5,619
01-16-2016, 05:47 PM
14. ### How to take into account different treatments, doses and starting health

Hello all, first thread so please be kind! I have rudimentary statistics knowledge of anovas and regression but am piling through how-to videos of...

• Replies: 20
• Views: 1,245
08-21-2017, 04:06 PM

Can anyone suggest a guide or link for more information on the transformation or non normally dirtibuted data? many thanks yoma

• Replies: 19
• Views: 8,169
08-16-2010, 11:59 AM
16. ### 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: 7,809
02-03-2012, 01:00 PM
17. ### Polychoric Principal Component Analysis

Hi everyone: I am working with a questionnaire to evaluate socioeconomic position in a sample. It was basically counting a list of items to assess...

• Replies: 19
• Views: 8,159
06-27-2014, 01:30 PM
18. ### Urgent, which test can I use to test this hypothesis???

Hi all, please help me I am stuggling doing my data analysis of my poject and my supevisor is on holiday but I have to finish all the ananlysis in...

• Replies: 18
• Views: 5,004
07-17-2011, 05:16 PM
19. ### 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: 6,536
10-13-2011, 09:04 AM
20. ### Low Cronbach alpha on recognised instrument

Hi, I am using a standard survey instrument that during a meta analysis over 15 years has shown a relability of 0.73 for a particular facet. I...

• Replies: 18
• Views: 16,677
03-13-2013, 07:08 AM
21. ### 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: 8,094
07-08-2013, 11:38 AM
22. ### Generating Skewed Normal Distributions

I want to generate Random Normal Distributions with specific degrees of Skewness and Kurtosis. So far I have looked at the following two approaches:...

• Replies: 17
• Views: 43,854
06-03-2016, 10:10 PM
23. ### 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: 7,109
07-04-2010, 05:19 AM
24. ### Appropriate method for research model

Hi guys! Please i need your advice! I have developed a model about some factors that influence the desire of members to share information is...

• Replies: 16
• Views: 7,016
07-26-2011, 10:11 PM
25. ### Was thinking Kendall's Tau but...(correlation)

Hey guys, I was wondering if you could help me out with this: I have seven sites along the west coast each with two types of data and several...

• Replies: 16
• Views: 6,476
08-15-2011, 08:06 PM
26. ### Best design for this experiment?

Hello all. I am having some trouble with my experiment and would be the best way to analyze the data. I have 4 different chemicals each at one...

• Replies: 16
• Views: 5,113
08-26-2011, 04:55 PM
27. ### Non-parametric equivalent of a factorial anova (not repeated measures)?

Hi there. Firstly apologies for the awful spelling in the main title - obviously I meant factorial Secondly hello I am new to this forum and...

• Replies: 16
• Views: 27,224
12-03-2011, 03:52 PM
28. ### Article on logistic regression - don't understand logic of statement.

The author Menard, has written a good deal on this topic and this is from a recent (2011) journal article. This makes sense. But I don't...

• Replies: 16
• Views: 3,670
06-26-2013, 11:44 AM
29. ### obtain inter-aarival from bulk arrival

I have some data regarding the arrival of customers at a shop. These arrivals are bulk arrivals which have been collected at fixed time intervals...

• Replies: 16
• Views: 3,301
02-19-2017, 05:24 PM
30. ### 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: 7,580
08-14-2010, 08:41 AM
31. ### Contradictory Results re. Normality Tests

Hello, I've got an issue regarding normality, I have tried to figure it out but need some help please. Checking for normality of the variable...

• Replies: 15
• Views: 10,351
06-13-2011, 03:43 PM
32. ### Would you help me? (Tranformations)

Hi, I was looking for tranformations for ratio data. I find that arcsine tranformation is adecuate for that kind of data (ratio). For that...

• Replies: 15
• Views: 5,687
06-06-2012, 09:07 AM
33. ### 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: 7,217
02-15-2013, 02:36 PM
34. ### How to generate an autocorrelated random variable?

Hi, I know I can generate two correlated random variables x1 an x2 using x1= z1 x2= c* z1 + sqrt(1- c^2)* z2 Where z1: standardnormal...

• Replies: 15
• Views: 5,313
03-11-2015, 01:08 PM
35. ### 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: 6,709
09-07-2010, 05:59 AM
36. ### What test can I use to compare categorical and continuous variables?

Hello guys: I have two sets of data, actual outcome (live vs. dead), which is categorical, and a risk adjustment predicted outcome, which is...

• Replies: 14
• Views: 13,397
08-09-2011, 02:58 PM
37. ### 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: 6,777
05-09-2015, 07:04 AM
38. ### Selecting the RIGHT method this analysis --->

Any help with the following would be greatly appreciated. I have a model of the form: Y = \mu +C +X+S+e where Y is continuous and C,X and S...

• Replies: 14
• Views: 3,529
08-13-2012, 05:17 PM
39. ### Help with inter-rater reliability

Hi all, I've got a set of data that I need some advice on. I'm working on a pilot project where a group of four people evaluate essays. The way that...

• Replies: 14
• Views: 4,007
09-07-2012, 05:13 PM
40. ### Need help analyzing data in SPSS

Hello everybody :) We conducted a simple experiment, our hypothesis was that negative biometeorological forecast induces nocebo effect, especially...

• Replies: 14
• Views: 2,758
04-26-2013, 08:59 PM
41. ### Sample Size Calc for Right Skewed Data

I have a request from a person for a sample size calculation. When I requested information about the potential study data they provided two means and...

• Replies: 14
• Views: 1,901
06-14-2017, 11:30 AM
42. ### Could anyone recommend an interactive application for mass data analysis?

Hi, everybody I need to conduct a large amount of data analysis on database. Could anyone recommend an interactive application for data analysis?...

• Replies: 13
• Views: 3,260
05-31-2012, 09:25 PM
43. ### Multiple Group Analysis necessary?

Hi, for my master's thesis I collected data with an online survey, measuring consumer behaviour. I used two samples, one group from Australia and...

• Replies: 13
• Views: 16,765
06-22-2012, 03:05 PM
44. ### Small sample size, correlation

Ok, I am helping someone to run spss on his data,He just wants to know the results and not advice.But still I am hating my gut because his method...

• Replies: 13
• Views: 23,848
10-11-2010, 02:31 PM
45. ### Inter-observer variability

Dear all, I hope so much anyone here may help me with my question regarding inter-observer variability: 3 observers measure the diameter of...

• Replies: 13
• Views: 24,212
07-02-2011, 06:36 PM
46. ### Linear Mixed Models in SPSS for repeated measures

I'm having trouble formulating a model with Linear Mixed Models in SPSS. I'm trying to overcome the problem of related errors due to repeated...

• Replies: 13
• Views: 12,996
08-08-2011, 04:38 AM
47. ### Research Ethics

If allowed, should animal research be limited to research that investigates cures for terminal illnesses, or should they continue to be used in any...

• Replies: 13
• Views: 3,940
01-23-2012, 09:06 PM
48. ### The joint normality of the two estimates for linear regression model

I have a different opinion with my colleagues on this question. Could someone help us to clarify this issue? Y = X_1\beta_1 + X_2\beta_2 +...

• Replies: 13
• Views: 3,297
BGM
12-22-2012, 12:27 PM
49. ### pre- post- intervention survey analysis

Hi all, I am trying to figure out how to analyze survey results administered as part of a randomized trial. We drew random samples of households...

• Replies: 13
• Views: 5,835
03-05-2013, 11:42 AM

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