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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: 18,695
10-11-2014, 12:02 PM
1. NOOB questions about Mancova, Ancova and multiple regression

I'm a beginning grad student and having a tough time understanding how test results determine if there is reliability and validity. In the study...

• Replies: 3
• Views: 3,597
12-02-2011, 09:58 AM
2. ANOVA Design and Analysis

Hello, This is my first post so I hope my question is appropriate for the group. I have performed an experiment where we have blood samples...

• Replies: 1
• Views: 1,400
12-02-2011, 02:33 AM
3. Help with work project

I am attempting to do a statistical breakdown of the results from a competition we do here at my job each year. The competition has relavance, so...

• Replies: 1
• Views: 1,436
11-30-2011, 05:47 PM
4. Sum of independent beta-Bernoulli random variables

I'm looking for the distribution of the sum of independent beta-Bernoulli random variables, that is Bernoulli random variables with beta-distributed...

• Replies: 5
• Views: 6,655
11-30-2011, 04:36 PM
5. Where to start?

I am trying to find the best way to identify the optimal quantity for packaging that reduces handling of product. example: Product 1 ...

• Replies: 2
• Views: 1,448
11-30-2011, 03:17 PM
6. significant interaction but variables not significant on their own

Hi I was wondering if anyone could help me. I have been looking at consumers purchase intention levels across three indepedent variables, age,...

• Replies: 6
• Views: 7,468
11-30-2011, 12:38 PM
7. I need help in my undergraduate project

Hi all, I have conducted a questionnaire about factors affecting academic performance my sample size =300 students from different colleges...

• Replies: 9
• Views: 2,785
11-28-2011, 06:23 PM
8. How to weight residents survey by demographics

Hi I am analysing a residents survey and I am trying to find the best advice around how to weight the responses. I have calculated a matrix of...

• Replies: 0
• Views: 1,787
11-28-2011, 07:39 AM

Hello, I am new to cluster analysis and I am trying to run some analysis based on some survey data I have. I have found a lot of information...

• Replies: 0
• Views: 1,470
11-28-2011, 06:03 AM
10. Homogeneity of Variance

Hi all, I want to test the Homogeneity of Variance (HV) before conducted MANOVA, and I have to groups (different nationality; Arabs and British)...

• Replies: 1
• Views: 1,954
11-26-2011, 06:46 PM
11. Dickey Fuller Test

I am studying the Dickey Fuller test. The book of reference is Introductory Econometrics for Finance by C. Brooks. I firstly consider the zero mean...

• Replies: 1
• Views: 3,133
11-25-2011, 01:49 AM
12. Comparing Correlation's Effect Size, Significance between Two Populations

Hi, All! I have variables describing students (N=340), both boys (N=160) and girls (N=180). I calculated Pearson's correlation (using SPSS) for...

• Replies: 2
• Views: 2,257
11-22-2011, 08:13 AM
13. 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: 4,521
11-22-2011, 12:09 AM
14. 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: 1,940
11-21-2011, 10:32 AM
15. Principal Component Analysis

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

• Replies: 0
• Views: 1,558
11-18-2011, 11:48 PM
16. 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: 3,280
11-18-2011, 06:20 PM
17. 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: 3,052
11-18-2011, 01:04 PM
18. 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: 5,163
11-18-2011, 09:36 AM
19. 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: 4,201
11-16-2011, 01:39 PM
20. 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: 2,883
11-16-2011, 12:51 AM
21. 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: 2,764
11-15-2011, 08:21 PM
22. 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: 2,791
11-15-2011, 08:59 AM
23. 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: 1,893
11-14-2011, 11:29 PM
24. 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: 9,720
11-14-2011, 09:37 PM
25. 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: 2,837
11-14-2011, 06:29 PM
26. 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: 2,565
11-14-2011, 06:28 PM
27. 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: 1,742
11-14-2011, 05:49 PM
28. 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: 3,123
11-14-2011, 08:38 AM
29. 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: 1,349
11-14-2011, 06:39 AM
30. 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: 2,225
11-13-2011, 11:00 PM
31. 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: 4,935
11-13-2011, 05:14 PM
32. 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: 1,823
11-13-2011, 05:06 PM
33. 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: 3,095
11-12-2011, 03:02 PM
34. 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: 2,095
11-12-2011, 10:34 AM
35. 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: 2,038
11-12-2011, 08:30 AM
36. 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: 20,836
11-12-2011, 03:41 AM

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: 1,557
11-12-2011, 02:52 AM
38. 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: 4,074
11-11-2011, 02:29 PM
39. 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: 1,916
11-11-2011, 11:47 AM
40. 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: 3,340
11-10-2011, 05:29 PM
41. 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: 1,256
11-10-2011, 06:04 AM
42. 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: 7,716
11-10-2011, 05:37 AM

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: 2,300
11-10-2011, 01:19 AM
44. 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: 8,127
11-09-2011, 12:42 PM

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: 3,318
11-08-2011, 09:11 PM
46. 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: 2,066
11-08-2011, 07:02 AM
47. 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: 4,321
11-07-2011, 10:09 PM
48. 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: 2,157
11-07-2011, 05:58 PM
49. 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: 4,336
11-07-2011, 04:08 PM
50. 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: 2,202
11-07-2011, 09:34 AM
51. 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: 4,969
11-06-2011, 06:24 PM
52. 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: 2,895
11-04-2011, 12:27 PM
53. 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: 2,223
11-02-2011, 12:59 AM
54. 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: 1,900
10-31-2011, 11:50 AM
55. 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: 1,567
10-30-2011, 11:09 PM
56. 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: 1,590
10-30-2011, 06:35 PM
57. 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: 7,509
10-30-2011, 12:41 AM

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• Replies: 1
• Views: 3,612
10-29-2011, 12:19 AM
59. 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: 3,833
10-28-2011, 03:34 PM
60. 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: 2,064
10-28-2011, 03:11 AM

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