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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: 18,626
10-11-2014, 12:02 PM
1. ### whether opinion differes among respondents from different group

I want to test whether response differ among groups regarding e-government interoperability. There are 14 itens regarding interoperability (Likert...

• Replies: 1
• Views: 2,259
02-16-2011, 03:26 AM

I asked for help few days back, but probably my question was not clear that time. I have asked e-gov experts to rank some issues related to e-gov...

• Replies: 7
• Views: 2,458
01-19-2011, 05:19 AM
3. ### Taguchi designs

Dear TalkStats Forum, I am using Taguchi design in my experiments. I have a presentation soon and I want to explain this design in a very dynamic...

• Replies: 1
• Views: 1,395
03-26-2015, 03:31 PM
4. ### Two way Anova+post hoc tests plz help

I have three treatment groups I II &III, i tested rate of wound healing in the three gps vs several variables using the two way anova ,gender...

• Replies: 0
• Views: 2,183
12-29-2012, 03:44 AM
5. ### How to combine Probability Distribution Function of Two correlated variables?

I have the probability distribution Functions(PDF) of the wind speeds of two wind sites which have a certain Pearson's correlation coefficient. How...

• Replies: 0
• Views: 2,737
06-04-2012, 05:21 PM
6. ### Repeated measures, cross-sectional data check

Hey folks, Netherlands here, struggeling with my masterthesis. I conducted an repeated measures experiment with four groups and two trials. The...

• Replies: 0
• Views: 665
05-27-2017, 05:09 AM
7. ### Repeated measures, cross-sectional data check

Hey folks, Netherlands here, struggeling with my masterthesis. I conducted an repeated measures experiment with four groups and two trials. The...

• Replies: 0
• Views: 570
05-27-2017, 05:01 AM
8. ### [SPSS - Hypothesis testing] Controlling for a variable. ANCOVA?

Hi! I am using open data from New York City's yellow cabs and the in 2013 introduced citibikes (bikesharing service) to see if the introduction of...

• Replies: 0
• Views: 644
05-12-2016, 03:18 PM
9. ### comparing two measurements over time

I'm designing an experiment with two condition. Cond A with no manipulation of the independent var and ConB with manipulation of the independent var....

• Replies: 8
• Views: 7,762
08-27-2007, 04:38 AM
10. ### Distribution not normal

Hello, The Shapiro-Wilk test of normality on my data indicates that the distribution is not normal. I have tried to compute the data, but I...

• Replies: 4
• Views: 3,304
04-11-2011, 05:29 PM
11. ### Can you estimate the power of a test by simulating data?

I have generated 1000 samples (four groups using the sample size, mean, and standard deviation for each group for a normally distributed variable)...

• Replies: 6
• Views: 1,633
07-06-2013, 06:31 PM
12. ### desperate for some help with a confidence interval question.

• Replies: 0
• Views: 1,530
04-30-2012, 08:30 AM
13. ### Omitted-variable bias in the constant of multiple regression under heteroskedasticity

Good morning, I would like to have some deeper information about omitted-variable bias. Here is the real model: Callback = Constant + b1*Race +...

• Replies: 1
• Views: 1,814
BGM
05-14-2013, 02:26 PM
14. ### Help! Selection of statistical methods for experiment

Hello everyone. I need help with the selection of statistical methods for one experiment. I'm a total newbie to the statistics :yup: So, I need to...

• Replies: 0
• Views: 1,027
11-07-2012, 06:15 PM
15. ### Regression Method

I need to create a software algorithm to calculate cubic or quartic regression on an array of values, but it's been a while since my last stats...

• Replies: 4
• Views: 3,326
06-15-2007, 01:34 PM
16. ### Name That Model!

Keywords: OLS, WLS, GLM, GzLM, Heteroscedasticity , Assumptions, Residuals, Errors Hullo I have been working full time and studying part time...

• Replies: 7
• Views: 1,823
08-05-2016, 04:22 PM
17. ### Mann-Whitney or independant T-test?

Hey all, I'm in the middle of a study comparing a group of CONTROL MICE vs EXPERIMENTAL MICE before and after a stroke. I'm looking at comparing:...

• Replies: 3
• Views: 4,289
06-13-2011, 05:01 PM
18. ### help choosing LDA situation to implement

Hey all, I am a comp sci grad student interested in pattern recognition, and have been told that LDA is a good place to start before moving into...

• Replies: 0
• Views: 2,409
10-06-2008, 01:00 AM
19. ### how to obtain p-value from test statistic

I am familiar with how to obtain the p-value from the t-statistic - the t-statistic is calculated by looking at the difference in means in two...

• Replies: 0
• Views: 2,745
12-29-2016, 03:26 PM
20. ### Help analyzing bird migration patterns?

Hi. I am trying to analyze data I have on bird migration and am stuck on what I need to do. Basically, I have the maximum abundance of birds seen...

• Replies: 0
• Views: 803
01-29-2014, 09:50 AM
21. ### Pre/Post-Survey Methodology Question

I'm working on a project where we did a pre-survey to get a baseline assessment on health knowledge and attitudes in several states, conducted a...

• Replies: 5
• Views: 13,112
01-06-2012, 06:35 AM
22. ### Mediation results where MV and IV become insignificant

I have been running some mediation models and have come across a finding where individually the IndVar-DepVar and Mediator-DepVar relationships are...

• Replies: 0
• Views: 1,650
02-26-2013, 06:42 PM
23. ### Structural Equation Modeling: When and why do you use Z-scores instead of Mean.

Hi. Can anyone help me answer the question why some people who do SEM use z-scores as opposed to using mean scores? (articles and books are...

• Replies: 4
• Views: 4,603
01-15-2015, 11:27 AM
24. ### random assignment

does anyone know what is a random assignment in a true experiment. Thanks

• Replies: 1
• Views: 1,658
05-13-2011, 01:06 AM
25. ### ANOVA and Tukey comparisions

Hi! I'm using Minitab to run ANOVAs for a recent psycholinguistic experiment. My problem is that some interactions aren't even close to significant...

• Replies: 0
• Views: 1,098
08-16-2014, 05:21 PM
26. ### Cohort

Hi everyone Is sent my research proposal to ethic committee, the study design is prospective cohort. I got a reply that i should change my study...

• Replies: 4
• Views: 3,031
11-18-2011, 01:04 PM
27. ### Mortality Statistics help

My prof gave me a hospital mortality data to analysis but i can not think of any things else apart from crude mortality rate. Data set contains the...

• Replies: 9
• Views: 2,188
02-10-2012, 06:23 AM
28. ### Multiple Comparison Correction - Help needed !

I know the concept that one should have statistical correction if multiple comparison are made between means. Such as the well-known bonferroni...

• Replies: 1
• Views: 4,014
08-20-2009, 09:42 AM
29. ### Time series analysis to test a system:This seems too simple. Have I missed something?

I wish to test whether or not Performance Measurement Frameworks (PMFs) may be influencing future values of the variable being monitored. I may be...

• Replies: 0
• Views: 1,201
01-26-2012, 05:44 PM
30. ### Permanova design for BACI study (using Primer)

my first question here! i need to do a few analyses on a biological dataset, and I am a bit puzzled about how to set my Permanova design. I use...

• Replies: 5
• Views: 3,150
08-09-2013, 03:51 AM
31. ### panel data correlation

I am working on paneldata (xtset firm date). Before starting my regression analyses, I want to construct a Pearson Correlation Matrix between the...

• Replies: 0
• Views: 1,645
09-25-2014, 04:48 AM
32. ### Interpretation of Autocorrelation

Hi, I have a question regarding the autocorrelation of time series. In my computation (using a software package) the first coefficient yields...

• Replies: 0
• Views: 2,062
11-10-2012, 01:08 AM
33. ### Deck of cards: Odds of being dealt 3 of a suit?

I'm trying to figure out an algorithm to calculate the odds of being dealt 3 of a particular suit in a multi deck situation. Assume we have 3...

• Replies: 2
• Views: 8,506
09-15-2008, 09:46 AM
34. ### composite variables

Dear users, I have a question regarding the calculation of a composite variable out of 5 individual variables which I want to use in a MANOVA...

• Replies: 1
• Views: 1,202
05-03-2014, 03:55 PM
35. ### I have no idea where to start!!

I need to analyse data for research--- There are 3 outcomes (1,2,3) and two companies (a,b) with 3 departments each (a1,a2,a3 and 1b,2b,3b). I...

• Replies: 2
• Views: 2,415
08-05-2009, 05:36 PM
36. ### Violation?: Comparing group mean to population mean

Greetings! I was hoping you guys could help me out with a problem. Im curious to know how one would go about attacking a problem like this. I...

• Replies: 0
• Views: 3,416
11-09-2012, 08:42 AM

Hi all My data is as follows: I have seedling height divided <10 cm and >10cm I collected data across a glacier foreland using square plots. Each...

• Replies: 0
• Views: 788
01-12-2014, 04:42 PM
38. ### Suggestions for Statistical Methods for Health Research

I am currently planning a research project looking at a scoring system for patients (using demographics, social circumstances) to determine whether...

• Replies: 0
• Views: 880
01-18-2014, 11:59 AM
39. ### Discriminant analysis with mostly incomplete cases

Hello. I have a bit of a biostats problem. I’ve got data on 5 groups and 15 species. There are 9 variables, and 1000 cases total. The problem,...

• Replies: 6
• Views: 2,888
03-02-2009, 12:52 AM
40. ### Statistical test for comparing sensor data from different groups?

Hello there, Sorry I am new to this forum, but I hope you guys will try to help me nevertheless ;) Pardon my not-so-perfect English, too, I will try...

• Replies: 0
• Views: 942
09-10-2013, 10:01 AM
41. ### General method for data analysis

Dear community, maybe you can help me. I have a lots of data like this format: Person/points/work/power/sex Person1/75/10/120/m...

• Replies: 3
• Views: 1,327
11-14-2013, 10:32 AM

Hello, I do not have a background in statistics. I need help finding a methodology to compare the performance of a given set of items under...

• Replies: 0
• Views: 2,137
02-22-2011, 05:07 PM
43. ### Help on which test to choose for paired samples?

Hi there - I'm hoping to elicit help on which test to choose - Mann-Whitney vs Wilcoxin (signed rank or rank-sum)? I have paired water samples...

• Replies: 2
• Views: 1,137
06-03-2015, 07:33 AM
44. ### Sample Size Help

I am looking for some help. I am a marketer so I know just enough about stats to be dangerous, but I have an real life problem. I am mailing...

• Replies: 4
• Views: 1,824
01-24-2012, 12:24 PM
45. ### One Sample T-Test

For an exercise is received speed measurements on two road points. The cars drove along an urban road (30mph) that opened into a rural road (60mph)....

• Replies: 9
• Views: 2,366
01-08-2012, 02:06 PM
46. ### Meta-Analysis or alternative method?

I am carrying out a systematic review on conservative (physiotherapy) treatment in comparison to surgical treatment. I have recorded the return to...

• Replies: 4
• Views: 1,994
08-21-2013, 11:24 AM
47. ### Scaling technique

A friend of mine, a Ph.D. student, seeks my advice on the appropriate scaling technique that can be used for his research. The research involves...

• Replies: 0
• Views: 3,757
03-25-2009, 04:10 AM
48. ### Relationship between foods consumed and diseases developed

What kind of data can we collect to find out the relationship between foods consumed and diseases developed? If a patient says he is a vegetarian...

• Replies: 0
• Views: 2,208
12-01-2009, 11:55 PM
49. ### how to measure love/hate

Any idea about how can one develop a scale (Likert) to measure concepts like love, liking, hate etc towards some prominent leaders from certain...

• Replies: 4
• Views: 5,575
04-13-2010, 01:27 PM
50. ### How to find out the specific association of a particular age bracket to a particular

If I have a table (mXn) that contains the rows of age brackets (like 25-35 years, 35-45 years, 46-60 years) and three columns of low stress, medium...

• Replies: 7
• Views: 3,611
04-10-2010, 10:15 AM
51. ### Statistical tests for the analysis of acoustic parameters of one speaker

Hello! I would like to address the question regarding the statistics. I am analyzing the relation between the narrow focus and fundamental...

• Replies: 0
• Views: 892
08-26-2015, 05:38 AM
52. ### Sample size calculation

I have a normal distribution: log(xi/yi) ~N (0, c^2/yi). I need to work on the posterior distribution of c^2. I know c^2 follows a gamma...

• Replies: 1
• Views: 333
07-07-2017, 12:19 PM
53. ### non-parametric 1-way anova, but samples not independent

Hi, I'm in a quandary. Samples that I wish to analyse are ordinal and should be treated as a matched (dependent) since they were drawn from a...

• Replies: 1
• Views: 4,230
09-07-2010, 07:27 AM
54. ### Choice of analysis method and variable skew

Hello, I'm a new poster here, so I apologise if this is not the right place. My problem is as follows: I am conducting research into fatigue and...

• Replies: 2
• Views: 1,934
02-14-2012, 02:30 PM
55. ### What is the best way to treat Autocorrelation and Heteroscedasticity problems in TS

Hi, I am doing time-series regression. I face the problems of Heteroscedasticity and Autocorrelation as following. ...

• Replies: 0
• Views: 1,781
08-14-2012, 05:15 AM
56. ### T-Test: How large is large?

I'm doing some research, I collected data from two different groups, 80 samples in each group. The data is borderline for normality. I've read on...

• Replies: 1
• Views: 4,948
12-18-2009, 03:14 AM
57. ### DF and fishers vs. pearson's

Hallo everyone I'm having a mental block today, and having trouble getting my df value. So, here's a summary of my data to help: 32...

• Replies: 3
• Views: 2,552
08-29-2011, 12:04 PM
58. ### Power calculation for accuracy tests

Excuse my ignorance I would like to do a simple study. I have 3 screening tests and a gold standard test which will put patients into +ve and -ve...

• Replies: 2
• Views: 1,387
08-10-2015, 02:41 PM
59. ### Question on what statistics I should use

Hello all, I have data from a survey of ex-prisoners. I want to look at the effect of victimization (victimized or not: dichotomous) on...

• Replies: 1
• Views: 1,075
08-27-2012, 03:49 AM

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