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Threads 961 to 1020 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. Mean centering (good bad or ugly?)

As part of a regression course I have to do mean centering. I looked it up and have read 4-5 articles on it. Generally opinions are skewed in the...

• Replies: 8
• Views: 15,897
10-16-2011, 12:45 PM
2. Cluster analysis vs multicolinearity

Hi you all, I hope you can help me with this following problem: 1. I've runned an factor analysis on my data for fifteen "need" items for sugar...

• Replies: 0
• Views: 3,367
10-17-2011, 06:40 AM
3. Multiple comparisons

Hello, I recently read an article where the authors claimed to use "Scheffe's test with Bonferonni correction." My understanding was that Scheffe's...

• Replies: 0
• Views: 1,823
10-18-2011, 09:08 AM
4. 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: 1,533
ARI
10-18-2011, 10:12 AM
5. 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: 2,242
10-19-2011, 12:58 PM
6. Quick question about reporting statistical results

Hey there, just wondering about proper reporting of results of my 2x2 ANOVA experiment: -I compared lots of morphometric measurements of sea...

• Replies: 5
• Views: 2,925
10-19-2011, 01:01 PM
7. normalization for detection of outliers

Hello everyone, I am working with a huge dataset and I'm trying to find outliers in each row for two subgroups of my dataset (G1 and G2)....

• Replies: 0
• Views: 3,885
10-20-2011, 08:59 AM
8. Logistic regression question

Hi, I have a large data set (over 1 million cases) and I put in approximately 5 to 10 IV that are all categorical. I am not getting a...

• Replies: 11
• Views: 5,468
10-20-2011, 11:11 AM
9. How to report t-test results

Hi, Im having trouble writting the result of a null hypothesis. so far this was the template i was using when reporting the result of a...

• Replies: 1
• Views: 12,596
10-20-2011, 11:45 PM
10. 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: 2,410
10-24-2011, 08:25 AM
11. Two rater agreement

Hi, I´m having a problem that has been puzzling me for a while. I´m looking for a method to analize the level of agreement between two independent...

• Replies: 0
• Views: 1,538
10-24-2011, 02:35 PM
12. Need guidance in determining how to analyze my data

Hi all, I've collected all of my data (n = 350) for my Master's thesis and I'm having trouble analyzing it using SPSS. Compounding my troubles is...

• Replies: 1
• Views: 3,139
10-25-2011, 03:44 PM
13. Help Me ........

I am looking for a topic for my Mphil research. I am fed up with searching for a topic. i am interested in computational statistics, multivariate...

• Replies: 6
• Views: 1,975
10-27-2011, 03:57 PM
14. Need help in how to structure my data in SPSS

Hi there, I am confused on how to input my data in SPSS. I have 2 questionaires for my research. Questionnaire 1 have 3 questions for...

• Replies: 1
• Views: 2,040
10-28-2011, 03:11 AM
15. Using chi-squared test for goodness of fit for different sizes of sample?

Firstly, apologies if I'm posting this in completely the wrong place. I'm trying to figure out a way to allow for different sized samples when...

• Replies: 1
• Views: 3,821
10-28-2011, 03:34 PM

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• Replies: 1
• Views: 3,580
10-29-2011, 12:19 AM
17. Discrete distribution with var larger than mean

Hi, everyone. Is there any statistical distribution (other than binomial) with its variance larger than its mean? Preferably, a distribution which...

• Replies: 3
• Views: 7,479
10-30-2011, 12:41 AM
18. Question about correlation and regression using entire ppopulation

Hi, I am working on a project were I am doing an analysis on the relationship between two metric variables on a county level in the United States....

• Replies: 1
• Views: 1,583
10-30-2011, 06:35 PM
19. Idea for a project (data set selection)!

Hello everyone! I really need your help!!! I'm taking a risk class, and I have to do a final project, but I don't know yet what data set to pick. ...

• Replies: 1
• Views: 1,560
10-30-2011, 11:09 PM
20. Urgent Help Needed!!!

Hi. I am getting really confused... Conducted a research with 6 people. they had 2 different conditions (medicine and placebo), and they were all...

• Replies: 1
• Views: 1,892
10-31-2011, 11:50 AM
21. 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: 2,208
11-02-2011, 12:59 AM
22. Correlating behaviors in time

This is definitely off topic but still linked. I saw some of what you do TheEcologist. I asked a question on here about correlating behaviors in...

• Replies: 4
• Views: 2,865
11-04-2011, 12:27 PM
23. Strict and Weak Stationarity Tests

Hello, As far as i know stationarity can be characterized as weak and strict. The most well known test for stationarity are Dickey Fuller,...

• Replies: 2
• Views: 4,955
11-06-2011, 06:24 PM
24. Anova test?

I have data for 09,10, and 2011. I have an exertion level for each individual. My indivduals are classified by the shift they work (8 day, 8 night,...

• Replies: 4
• Views: 2,193
11-07-2011, 09:34 AM
25. excel to SAS

library work 'c:\documents and settings\desktop\s' data s.sas; infile 'C:\Documents and Settings\Desktop\sas.prn' firstobs=2; input subject salary...

• Replies: 6
• Views: 4,300
11-07-2011, 04:08 PM
26. Outlier detection

Hi all, I am looking for a way to detect outliers in data. I have a variable Y, which is of interest. In addition, I have a variable X that...

• Replies: 2
• Views: 2,135
11-07-2011, 05:58 PM
27. 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: 4,291
11-07-2011, 10:09 PM
28. Cointegration and Correlation

Hello, Based on real data (e.g. spot and futures prices of an index) if two series are correlated in the long run (e.g. strong positive...

• Replies: 0
• Views: 2,048
11-08-2011, 07:02 AM

Hi, please help me with this simple question that no one at my uni seems to be able to answer! I have 3 groups (n=20) where I'm looking to...

• Replies: 3
• Views: 3,280
11-08-2011, 09:11 PM
30. non-significant Paired T-test, what happens next??

Hi, I'm analysing my data for my master's dissertation and I'm having problems! I have 3 "before" and "after" treatment groups (n=20 each) and...

• Replies: 7
• Views: 8,100
11-09-2011, 12:42 PM

the *** is a validated tool, has been shown to discriminate cases diagnosed according to the DSM IV, and importantly we determined age-appropriate...

• Replies: 0
• Views: 2,279
11-10-2011, 01:19 AM
32. Transform data for outlier analysis?

Hey everyone, I have a data set which is log normally distributed and want to detect outliers, so far I used a threshold approach: vector...

• Replies: 10
• Views: 7,696
11-10-2011, 05:37 AM
33. Confusion in calculating average-strange case

:mad:Plz find the attachment & help me in solving value of average in these strange cases. Link of my word problem is:...

• Replies: 0
• Views: 1,244
11-10-2011, 06:04 AM
34. Mixed models in SPSS -- swapping predictor and predicted?

Hi, I'm working on a project where I have repeated measures of a (continuous) IV and DV. At each measurement "time" I would like to predict the...

• Replies: 5
• Views: 3,329
11-10-2011, 05:29 PM
35. need urgent help

need help Hi, I have found some difficulty in solving this exercise. HINT: Use the fact that T/σ^2~chi-squared (n-1) and the moments of the...

• Replies: 3
• Views: 1,901
11-11-2011, 11:47 AM
36. Generate Data for Correlated Continuous and Discrete variables

Hi I was wondering if anybody could suggest an appropriate approach for the following... I have one independent variable, X, which takes the...

• Replies: 5
• Views: 4,062
11-11-2011, 02:29 PM

Respected experts! I have a table with different aminoacids in rows and different species in columns. Every cell contains relative amount of current...

• Replies: 0
• Views: 1,543
11-12-2011, 02:52 AM
38. 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: 20,792
11-12-2011, 03:41 AM
39. Finding the correct test for binary data

Hi folks, i have some problems with my evaluation. We have collect tons of data from 23 persons for our new road study. I have now a time series...

• Replies: 1
• Views: 2,029
11-12-2011, 08:30 AM
40. Cluster analysis

Hi all! I am new here, and I need some help. I have done some cluster analysis (K-means), and got four groups, two of which are "high" and "low"....

• Replies: 5
• Views: 2,083
11-12-2011, 10:34 AM
41. Friedman test -- post hoc

Good day, I am willing to compare n sample means (where n > 2) of random variables. I am willing to use Friedman test to see if there is any...

• Replies: 0
• Views: 3,085
11-12-2011, 03:02 PM
42. determining sample size

Hello everyone, i hope that someone can help me. i'm doing an experiment at my work place. i have 4 vehicles that need to go through the same...

• Replies: 1
• Views: 1,805
11-13-2011, 05:06 PM
43. Longitudinal analysis and the independence assumption

This is a bit of a long one, but I would really appreciate some help with it. I have a long list of data which describes whether a violent...

• Replies: 9
• Views: 4,921
11-13-2011, 05:14 PM
44. canonical correlation and pseudoreplication

Hello I have just joined Talk Stats and was hoping you all might be able to give me some advice. I have used a canonical correlation analysis...

• Replies: 2
• Views: 2,216
11-13-2011, 11:00 PM
45. Can pilots be included in the full study?

Random sampling = each member gets an equal chance of being selected. If this is done with a random number generator(lottery style) then the two...

• Replies: 0
• Views: 1,345
11-14-2011, 06:39 AM
46. Chi Square - confused which variables to use.

Hello I am confused on what type of data to use to perform a Chi Square test. It says on my lecture notes to use 2 nominal variables, likewise it...

• Replies: 4
• Views: 3,112
11-14-2011, 08:38 AM
47. Confidence Interval Question

Let Y_n be the nth order statistic of a random sample of size n from a distribution that has pdf f(x) = (3x^2)/(t^3) with 0<x<t. a) Show that P(c...

• Replies: 0
• Views: 1,731
11-14-2011, 05:49 PM
48. student t, and cross-sectional dependence (2 questions)

hi all, 1st Question: i'm doing t-tests and if in a most simplistic hypothetical example i received values like the following: -0.326542102...

• Replies: 1
• Views: 2,558
11-14-2011, 06:28 PM
49. Question about Statistics Application to C=0 Zero Acceptance Number Sampling Plan

My company is using the following sampling table based on Nicholas Sequigla's Zero Acceptance Number Sampling Plan: ...

• Replies: 0
• Views: 2,821
11-14-2011, 06:29 PM
50. Statistical Inference exam question

My question is why divide 4 out of 10?? and where did 4 come from? also I don't understand where 1.96 come from.

• Replies: 5
• Views: 9,698
11-14-2011, 09:37 PM
51. Using a valid researh tool with missing data

Hi guys, During my M.A thesis i've developed a research tool to measure Urabnic gentrification. The tool is build of 10 items - all of them are...

• Replies: 3
• Views: 1,877
11-14-2011, 11:29 PM
52. Testing Research Hypothesis

Hi All, I would like to ask about the best method to test the hypothesis research. I have 2 ethnic groups (both gender) and I want to know the...

• Replies: 4
• Views: 2,781
11-15-2011, 08:59 AM
53. Capability Analysis with Attribute Data

Is it possible to run Capability Analysis with attribute data? Data is a yes/no or pass/fail spanning 6months or work. Thank you for any...

• Replies: 1
• Views: 2,756
11-15-2011, 08:21 PM
54. Histogram height in frequency table

My question for the above image is why is it 190 for the histogram height and 4 at the end?? My other question is why is it 15 in histogram...

• Replies: 1
• Views: 2,875
11-16-2011, 12:51 AM
55. reliability using split half method

HI, I am supposed to do my reliability of my tool which has 30 questions MCQ type and the scoring is 0 and 1(correct answer),,,how am i supposed to...

• Replies: 0
• Views: 4,189
11-16-2011, 01:39 PM
56. Calculation of Autocorrelation

Hello, I have a data set of which i calcualte the autocorrelation at lag 1 in SAS ETS (Proc Arima) and SPSS. Then i try to calculate the...

• Replies: 2
• Views: 5,138
11-18-2011, 09:36 AM
57. 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: 3,033
11-18-2011, 01:04 PM
58. using non-parametric test as robustness check

hi all, I know the data are normally distributed (as indicated by Kolmogorov Smirnov). But when I use rank test to confirm hypothesis testing...

• Replies: 2
• Views: 3,275
11-18-2011, 06:20 PM
59. Principal Component Analysis

I have a large table (~500,000 rows) of normalized metrics (by Z-score) that looks like this: ...

• Replies: 0
• Views: 1,555
11-18-2011, 11:48 PM
60. univariate test for comparison

Hi, currently i'm testing a tree-based algorithm based on permutation tests (doesn't really matter for the question) for a paper. For every...

• Replies: 0
• Views: 1,932
11-21-2011, 10:32 AM

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