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Forum: Statistical Research

Statistical theory and methodology. Mathematical statistics. Parametric inference. Nonparametric inference.

  1. Sticky Thread 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...

    Started by Englund‎, 01-18-2014 04:56 AM
    • Replies: 14
    • Views: 18,695
    10-11-2014, 12:02 PM Go to last post
  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...

    Started by julieo00‎, 12-01-2011 03:34 AM
    • Replies: 3
    • Views: 3,597
    12-02-2011, 09:58 AM Go to last post
  2. Question 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...

    Started by penn whitley‎, 12-01-2011 06:06 PM
    anova, blocking, model, split-plot
    • Replies: 1
    • Views: 1,400
    12-02-2011, 02:33 AM Go to last post
  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...

    Started by swoody729‎, 11-29-2011 09:53 PM
    • Replies: 1
    • Views: 1,436
    11-30-2011, 05:47 PM Go to last post
  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...

    Started by SBlais‎, 11-30-2011 01:55 PM
    bernoulli distribution, beta distribution, binominal, distribution, mathematical statistics
    • Replies: 5
    • Views: 6,655
    11-30-2011, 04:36 PM Go to last post
  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 ...

    Started by JHallagin‎, 11-30-2011 02:41 PM
    • Replies: 2
    • Views: 1,448
    11-30-2011, 03:17 PM Go to last post
  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,...

    Started by kassos‎, 11-22-2011 09:52 AM
    • Replies: 6
    • Views: 7,468
    11-30-2011, 12:38 PM Go to last post
  7. Question 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...

    Started by Miss..Stats‎, 11-28-2011 04:50 PM
    • Replies: 9
    • Views: 2,785
    11-28-2011, 06:23 PM Go to last post
  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...

    Started by wilbur750‎, 11-28-2011 07:39 AM
    • Replies: 0
    • Views: 1,787
    11-28-2011, 07:39 AM Go to last post
  9. Wink Question about cluster analysis

    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...

    Started by Johngr55‎, 11-28-2011 06:03 AM
    • Replies: 0
    • Views: 1,470
    11-28-2011, 06:03 AM Go to last post
  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)...

    Started by ghada8888‎, 11-22-2011 05:15 PM
    • Replies: 1
    • Views: 1,954
    11-26-2011, 06:46 PM Go to last post
  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...

    Started by zarasandreas‎, 11-24-2011 12:54 PM
    dickey fuller, econometrics, stationarity
    • Replies: 1
    • Views: 3,133
    11-25-2011, 01:49 AM Go to last post
  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...

    Started by jonesh‎, 11-21-2011 10:45 PM
    • Replies: 2
    • Views: 2,257
    11-22-2011, 08:13 AM Go to last post
  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...

    Started by Dave4‎, 08-29-2011 10:43 PM
    2 Pages
    1 2
    • Replies: 22
    • Views: 4,521
    11-22-2011, 12:09 AM Go to last post
  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...

    Started by serge‎, 11-21-2011 10:32 AM
    hypothesis testing, p-value, univariate
    • Replies: 0
    • Views: 1,940
    11-21-2011, 10:32 AM Go to last post
  15. Principal Component Analysis

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

    Started by mfurlend‎, 11-18-2011 11:48 PM
    • Replies: 0
    • Views: 1,558
    11-18-2011, 11:48 PM Go to last post
  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...

    Started by sampahmel‎, 11-18-2011 05:25 PM
    • Replies: 2
    • Views: 3,280
    11-18-2011, 06:20 PM Go to last post
  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...

    Started by dockiss‎, 11-16-2011 09:51 AM
    • Replies: 4
    • Views: 3,052
    11-18-2011, 01:04 PM Go to last post
  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...

    Started by zarasandreas‎, 11-18-2011 03:09 AM
    • Replies: 2
    • Views: 5,163
    11-18-2011, 09:36 AM Go to last post
  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...

    Started by Amit Barve‎, 11-16-2011 01:39 PM
    • Replies: 0
    • Views: 4,201
    11-16-2011, 01:39 PM Go to last post
  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...

    Started by newbiestats‎, 11-15-2011 10:29 PM
    • Replies: 1
    • Views: 2,883
    11-16-2011, 12:51 AM Go to last post
  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...

    Started by NorthShore‎, 11-15-2011 12:58 PM
    • Replies: 1
    • Views: 2,764
    11-15-2011, 08:21 PM Go to last post
  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...

    Started by ghada8888‎, 11-14-2011 12:39 PM
    • Replies: 4
    • Views: 2,791
    11-15-2011, 08:59 AM Go to last post
  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...

    Started by Bitbels‎, 11-14-2011 09:22 AM
    • Replies: 3
    • Views: 1,893
    11-14-2011, 11:29 PM Go to last post
  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.

    Started by newbiestats‎, 11-14-2011 07:53 PM
    • Replies: 5
    • Views: 9,720
    11-14-2011, 09:37 PM Go to last post
  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: ...

    Started by vphan27‎, 11-14-2011 06:29 PM
    • Replies: 0
    • Views: 2,837
    11-14-2011, 06:29 PM Go to last post
  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...

    Started by sampahmel‎, 11-14-2011 06:25 PM
    • Replies: 1
    • Views: 2,565
    11-14-2011, 06:28 PM Go to last post
  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...

    Started by BrownianMan‎, 11-14-2011 05:49 PM
    • Replies: 0
    • Views: 1,742
    11-14-2011, 05:49 PM Go to last post
  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...

    Started by Bluerosebowl‎, 11-04-2011 04:52 PM
    • Replies: 4
    • Views: 3,123
    11-14-2011, 08:38 AM Go to last post
  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...

    Started by micdhack‎, 11-14-2011 06:39 AM
    • Replies: 0
    • Views: 1,349
    11-14-2011, 06:39 AM Go to last post
  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...

    Started by mags‎, 10-20-2011 11:30 PM
    canonical correlation, pseudoreplication
    • Replies: 2
    • Views: 2,225
    11-13-2011, 11:00 PM Go to last post
  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...

    Started by Alley_Cat‎, 01-30-2009 12:45 PM
    • Replies: 9
    • Views: 4,935
    11-13-2011, 05:14 PM Go to last post
  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...

    Started by boris_sht‎, 11-13-2011 07:39 AM
    • Replies: 1
    • Views: 1,823
    11-13-2011, 05:06 PM Go to last post
  33. Question 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...

    Started by mjomran‎, 11-12-2011 03:02 PM
    • Replies: 0
    • Views: 3,095
    11-12-2011, 03:02 PM Go to last post
  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"....

    Started by Calliope‎, 11-04-2011 10:08 AM
    • Replies: 5
    • Views: 2,095
    11-12-2011, 10:34 AM Go to last post
  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...

    Started by schrabauke‎, 11-12-2011 04:35 AM
    • Replies: 1
    • Views: 2,038
    11-12-2011, 08:30 AM Go to last post
  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,...

    Started by newbiestats‎, 11-10-2011 07:00 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 20,836
    11-12-2011, 03:41 AM Go to last post
  37. Question about proper test

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

    Started by fosgen‎, 11-12-2011 02:52 AM
    chi square, test
    • Replies: 0
    • Views: 1,557
    11-12-2011, 02:52 AM Go to last post
  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...

    Started by sammyj‎, 11-10-2011 07:15 AM
    correlation, multivariate, probit, simulated_data, simulation
    • Replies: 5
    • Views: 4,074
    11-11-2011, 02:29 PM Go to last post
  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...

    Started by JUSTICE‎, 11-11-2011 04:05 AM
    • Replies: 3
    • Views: 1,916
    11-11-2011, 11:47 AM Go to last post
  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...

    Started by weiaijiayou‎, 11-07-2011 01:22 AM
    mixed models, spss
    • Replies: 5
    • Views: 3,340
    11-10-2011, 05:29 PM Go to last post
  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:...

    Started by parag_ca‎, 11-10-2011 06:04 AM
    • Replies: 0
    • Views: 1,256
    11-10-2011, 06:04 AM Go to last post
  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...

    Started by bontus‎, 11-09-2011 11:59 AM
    outlier, transform
    • Replies: 10
    • Views: 7,716
    11-10-2011, 05:37 AM Go to last post
  43. Smile Please help, about cut-off point in a research tool

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

    Started by h974483‎, 11-10-2011 01:19 AM
    • Replies: 0
    • Views: 2,300
    11-10-2011, 01:19 AM Go to last post
  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...

    Started by Joelle‎, 10-30-2011 12:48 PM
    anova, paired t-test
    • Replies: 7
    • Views: 8,127
    11-09-2011, 12:42 PM Go to last post
  45. Cool Please help! T-test results & interpretation

    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...

    Started by Joelle‎, 11-06-2011 07:07 AM
    anova, t-test
    • Replies: 3
    • Views: 3,318
    11-08-2011, 09:11 PM Go to last post
  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...

    Started by zarasandreas‎, 11-08-2011 07:02 AM
    • Replies: 0
    • Views: 2,066
    11-08-2011, 07:02 AM Go to last post
  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...

    Started by mwill101‎, 11-07-2011 01:07 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,321
    11-07-2011, 10:09 PM Go to last post
  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...

    Started by NN_STAT‎, 11-07-2011 10:05 AM
    • Replies: 2
    • Views: 2,157
    11-07-2011, 05:58 PM Go to last post
  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...

    Started by shanehall.m‎, 11-07-2011 09:48 AM
    infile, sas, sas program
    • Replies: 6
    • Views: 4,336
    11-07-2011, 04:08 PM Go to last post
  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,...

    Started by shanehall.m‎, 11-04-2011 10:14 AM
    anova, average, categorical vairable
    • Replies: 4
    • Views: 2,202
    11-07-2011, 09:34 AM Go to last post
  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,...

    Started by zarasandreas‎, 11-06-2011 06:18 AM
    • Replies: 2
    • Views: 4,969
    11-06-2011, 06:24 PM Go to last post
  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...

    Started by trinker‎, 11-03-2011 10:57 AM
    • Replies: 4
    • Views: 2,895
    11-04-2011, 12:27 PM Go to last post
  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...

    Started by arborkoeser‎, 11-02-2011 12:59 AM
    • Replies: 0
    • Views: 2,223
    11-02-2011, 12:59 AM Go to last post
  54. Exclamation 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...

    Started by ihatestats‎, 10-30-2011 11:22 AM
    • Replies: 1
    • Views: 1,900
    10-31-2011, 11:50 AM Go to last post
  55. Lightbulb 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. ...

    Started by ani‎, 10-30-2011 10:55 PM
    • Replies: 1
    • Views: 1,567
    10-30-2011, 11:09 PM Go to last post
  56. Question 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....

    Started by elias2001‎, 10-30-2011 05:23 PM
    correlation, population, regression analysis
    • Replies: 1
    • Views: 1,590
    10-30-2011, 06:35 PM Go to last post
  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...

    Started by tsukiko‎, 10-29-2011 10:13 PM
    • Replies: 3
    • Views: 7,509
    10-30-2011, 12:41 AM Go to last post
  58. The gumball analogy - research advice please.

    zzzzzzzzzzzzzzzzz

    Started by screamingforanewday‎, 10-28-2011 08:45 PM
    • Replies: 1
    • Views: 3,612
    10-29-2011, 12:19 AM Go to last post
  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...

    Started by HelenW‎, 10-28-2011 02:26 PM
    chi-square, chi-squared
    • Replies: 1
    • Views: 3,833
    10-28-2011, 03:34 PM Go to last post
  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...

    Started by Cephas Thio Mairimashou‎, 10-27-2011 12:40 AM
    • Replies: 1
    • Views: 2,064
    10-28-2011, 03:11 AM Go to last post

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