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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: 18,638
    10-11-2014, 12:02 PM Go to last post
  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...

    Started by trinker‎, 10-15-2011 06:48 PM
    • Replies: 8
    • Views: 15,897
    10-16-2011, 12:45 PM Go to last post
  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...

    Started by Tom Meulders‎, 10-17-2011 06:40 AM
    cluster analysis, data reduction, mahalanobis, multicollinearity
    • Replies: 0
    • Views: 3,367
    10-17-2011, 06:40 AM Go to last post
  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...

    Started by jmill40000‎, 10-18-2011 09:08 AM
    • Replies: 0
    • Views: 1,823
    10-18-2011, 09:08 AM Go to last post
  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...

    Started by ARI‎, 10-18-2011 10:12 AM
    • Replies: 0
    • Views: 1,533
    10-18-2011, 10:12 AM Go to last post
  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...

    Started by cyanide‎, 10-18-2011 07:53 PM
    • Replies: 1
    • Views: 2,242
    10-19-2011, 12:58 PM Go to last post
  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...

    Started by aesopclimber‎, 10-15-2011 01:51 PM
    • Replies: 5
    • Views: 2,925
    10-19-2011, 01:01 PM Go to last post
  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)....

    Started by bontus‎, 10-20-2011 08:59 AM
    • Replies: 0
    • Views: 3,885
    10-20-2011, 08:59 AM Go to last post
  8. Wink 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...

    Started by edgemont1‎, 10-19-2011 03:27 PM
    • Replies: 11
    • Views: 5,468
    10-20-2011, 11:11 AM Go to last post
  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...

    Started by Alexia Dayan‎, 10-20-2011 11:03 PM
    • Replies: 1
    • Views: 12,596
    10-20-2011, 11:45 PM Go to last post
  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...

    Started by h974483‎, 10-22-2011 05:37 AM
    • Replies: 2
    • Views: 2,410
    10-24-2011, 08:25 AM Go to last post
  11. Two rater agreement

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

    Started by joplin‎, 10-24-2011 02:35 PM
    • Replies: 0
    • Views: 1,538
    10-24-2011, 02:35 PM Go to last post
  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...

    Started by canadianjameson‎, 10-25-2011 02:31 PM
    • Replies: 1
    • Views: 3,139
    10-25-2011, 03:44 PM Go to last post
  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...

    Started by hpanoo‎, 10-26-2011 09:26 AM
    • Replies: 6
    • Views: 1,975
    10-27-2011, 03:57 PM Go to last post
  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...

    Started by Cephas Thio Mairimashou‎, 10-27-2011 12:40 AM
    • Replies: 1
    • Views: 2,040
    10-28-2011, 03:11 AM Go to last post
  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...

    Started by HelenW‎, 10-28-2011 02:26 PM
    chi-square, chi-squared
    • Replies: 1
    • Views: 3,821
    10-28-2011, 03:34 PM Go to last post
  16. The gumball analogy - research advice please.

    zzzzzzzzzzzzzzzzz

    Started by screamingforanewday‎, 10-28-2011 08:45 PM
    • Replies: 1
    • Views: 3,580
    10-29-2011, 12:19 AM Go to last post
  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...

    Started by tsukiko‎, 10-29-2011 10:13 PM
    • Replies: 3
    • Views: 7,479
    10-30-2011, 12:41 AM Go to last post
  18. 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: 1,583
    10-30-2011, 06:35 PM Go to last post
  19. 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: 1,560
    10-30-2011, 11:09 PM Go to last post
  20. 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: 1,892
    10-31-2011, 11:50 AM Go to last post
  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...

    Started by arborkoeser‎, 11-02-2011 12:59 AM
    • Replies: 0
    • Views: 2,208
    11-02-2011, 12:59 AM Go to last post
  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...

    Started by trinker‎, 11-03-2011 10:57 AM
    • Replies: 4
    • Views: 2,865
    11-04-2011, 12:27 PM Go to last post
  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,...

    Started by zarasandreas‎, 11-06-2011 06:18 AM
    • Replies: 2
    • Views: 4,955
    11-06-2011, 06:24 PM Go to last post
  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,...

    Started by shanehall.m‎, 11-04-2011 10:14 AM
    anova, average, categorical vairable
    • Replies: 4
    • Views: 2,193
    11-07-2011, 09:34 AM Go to last post
  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...

    Started by shanehall.m‎, 11-07-2011 09:48 AM
    infile, sas, sas program
    • Replies: 6
    • Views: 4,300
    11-07-2011, 04:08 PM Go to last post
  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...

    Started by NN_STAT‎, 11-07-2011 10:05 AM
    • Replies: 2
    • Views: 2,135
    11-07-2011, 05:58 PM Go to last post
  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...

    Started by mwill101‎, 11-07-2011 01:07 PM
    2 Pages
    1 2
    • Replies: 20
    • Views: 4,291
    11-07-2011, 10:09 PM Go to last post
  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...

    Started by zarasandreas‎, 11-08-2011 07:02 AM
    • Replies: 0
    • Views: 2,048
    11-08-2011, 07:02 AM Go to last post
  29. 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: 3,280
    11-08-2011, 09:11 PM Go to last post
  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...

    Started by Joelle‎, 10-30-2011 12:48 PM
    anova, paired t-test
    • Replies: 7
    • Views: 8,100
    11-09-2011, 12:42 PM Go to last post
  31. 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: 2,279
    11-10-2011, 01:19 AM Go to last post
  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...

    Started by bontus‎, 11-09-2011 11:59 AM
    outlier, transform
    • Replies: 10
    • Views: 7,696
    11-10-2011, 05:37 AM Go to last post
  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:...

    Started by parag_ca‎, 11-10-2011 06:04 AM
    • Replies: 0
    • Views: 1,244
    11-10-2011, 06:04 AM Go to last post
  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...

    Started by weiaijiayou‎, 11-07-2011 01:22 AM
    mixed models, spss
    • Replies: 5
    • Views: 3,329
    11-10-2011, 05:29 PM Go to last post
  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...

    Started by JUSTICE‎, 11-11-2011 04:05 AM
    • Replies: 3
    • Views: 1,901
    11-11-2011, 11:47 AM Go to last post
  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...

    Started by sammyj‎, 11-10-2011 07:15 AM
    correlation, multivariate, probit, simulated_data, simulation
    • Replies: 5
    • Views: 4,062
    11-11-2011, 02:29 PM 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: 1,543
    11-12-2011, 02:52 AM Go to last post
  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,...

    Started by newbiestats‎, 11-10-2011 07:00 PM
    2 Pages
    1 2
    • Replies: 21
    • Views: 20,792
    11-12-2011, 03:41 AM Go to last post
  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...

    Started by schrabauke‎, 11-12-2011 04:35 AM
    • Replies: 1
    • Views: 2,029
    11-12-2011, 08:30 AM Go to last post
  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"....

    Started by Calliope‎, 11-04-2011 10:08 AM
    • Replies: 5
    • Views: 2,083
    11-12-2011, 10:34 AM Go to last post
  41. 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: 3,085
    11-12-2011, 03:02 PM Go to last post
  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...

    Started by boris_sht‎, 11-13-2011 07:39 AM
    • Replies: 1
    • Views: 1,805
    11-13-2011, 05:06 PM Go to last post
  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...

    Started by Alley_Cat‎, 01-30-2009 12:45 PM
    • Replies: 9
    • Views: 4,921
    11-13-2011, 05:14 PM Go to last post
  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...

    Started by mags‎, 10-20-2011 11:30 PM
    canonical correlation, pseudoreplication
    • Replies: 2
    • Views: 2,216
    11-13-2011, 11:00 PM Go to last post
  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...

    Started by micdhack‎, 11-14-2011 06:39 AM
    • Replies: 0
    • Views: 1,345
    11-14-2011, 06:39 AM Go to last post
  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...

    Started by Bluerosebowl‎, 11-04-2011 04:52 PM
    • Replies: 4
    • Views: 3,112
    11-14-2011, 08:38 AM Go to last post
  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...

    Started by BrownianMan‎, 11-14-2011 05:49 PM
    • Replies: 0
    • Views: 1,731
    11-14-2011, 05:49 PM Go to last post
  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...

    Started by sampahmel‎, 11-14-2011 06:25 PM
    • Replies: 1
    • Views: 2,558
    11-14-2011, 06:28 PM Go to last post
  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: ...

    Started by vphan27‎, 11-14-2011 06:29 PM
    • Replies: 0
    • Views: 2,821
    11-14-2011, 06:29 PM Go to last post
  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.

    Started by newbiestats‎, 11-14-2011 07:53 PM
    • Replies: 5
    • Views: 9,698
    11-14-2011, 09:37 PM Go to last post
  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...

    Started by Bitbels‎, 11-14-2011 09:22 AM
    • Replies: 3
    • Views: 1,877
    11-14-2011, 11:29 PM Go to last post
  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...

    Started by ghada8888‎, 11-14-2011 12:39 PM
    • Replies: 4
    • Views: 2,781
    11-15-2011, 08:59 AM Go to last post
  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...

    Started by NorthShore‎, 11-15-2011 12:58 PM
    • Replies: 1
    • Views: 2,756
    11-15-2011, 08:21 PM Go to last post
  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...

    Started by newbiestats‎, 11-15-2011 10:29 PM
    • Replies: 1
    • Views: 2,875
    11-16-2011, 12:51 AM Go to last post
  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...

    Started by Amit Barve‎, 11-16-2011 01:39 PM
    • Replies: 0
    • Views: 4,189
    11-16-2011, 01:39 PM Go to last post
  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...

    Started by zarasandreas‎, 11-18-2011 03:09 AM
    • Replies: 2
    • Views: 5,138
    11-18-2011, 09:36 AM Go to last post
  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...

    Started by dockiss‎, 11-16-2011 09:51 AM
    • Replies: 4
    • Views: 3,033
    11-18-2011, 01:04 PM Go to last post
  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...

    Started by sampahmel‎, 11-18-2011 05:25 PM
    • Replies: 2
    • Views: 3,275
    11-18-2011, 06:20 PM Go to last post
  59. 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: 1,555
    11-18-2011, 11:48 PM Go to last post
  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...

    Started by serge‎, 11-21-2011 10:32 AM
    hypothesis testing, p-value, univariate
    • Replies: 0
    • Views: 1,932
    11-21-2011, 10:32 AM Go to last post

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