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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: 18,645
    10-11-2014, 12:02 PM Go to last post
  1. Can I ignore the third independent variable?

    Hi all! Here's some background: I have measured 103 patients' postural steadiness. The independent variables (or within-subject factors) in my...

    Started by Tikkuhirvio‎, 01-16-2012 09:01 AM
    • Replies: 0
    • Views: 2,281
    01-16-2012, 09:01 AM Go to last post
  2. Factor scores to classify groups?

    Hi there, I have carried out a principal component analysis and I would like to use the factor scores to classify 5 groups of respondents. What...

    Started by gav‎, 01-16-2012 10:03 AM
    classification, factor scores, groups, pcp
    • Replies: 0
    • Views: 2,086
    01-16-2012, 10:03 AM Go to last post
  3. method comparison/agreement

    I have two methods I want to compare, normally I would use the Blamd and Altman approach to agreement, however in this case the two methods that I...

    Started by nicklt‎, 01-16-2012 11:09 AM
    • Replies: 1
    • Views: 2,016
    01-16-2012, 05:18 PM Go to last post
  4. Non-normality revisited

    We had a debate on whether normality is required for OLS regression a while back. I ran across this in a book on regression. One of the authors (Ali...

    Started by noetsi‎, 01-11-2012 12:01 PM
    • Replies: 3
    • Views: 1,860
    01-17-2012, 08:46 AM Go to last post
  5. Bradley-Terry model and the difference between football goals?

    Hi everyone ! I'm actually working on the Bradley-Terry model, and I cannot find any answer for my problem... Perhaps you can help me ?! The...

    Started by malymalone‎, 01-18-2012 01:08 PM
    • Replies: 0
    • Views: 1,524
    01-18-2012, 01:08 PM Go to last post
  6. likelihood in two parameters

    Hi guys, i'm new here! I'm an italian student. i would like to begin with a very stupid question :) i'm reading a paper on the likelihood ratio...

    Started by gravity_rainbow‎, 01-18-2012 05:27 PM
    • Replies: 3
    • Views: 1,817
    01-18-2012, 05:44 PM Go to last post
  7. parceling

    Hi, I've already posted this in the Psychology Statistics, but I am not sure if this was the right forum. Here are my questions again: I am...

    Started by Julia13‎, 01-19-2012 10:34 AM
    • Replies: 0
    • Views: 1,404
    01-19-2012, 10:34 AM Go to last post
  8. Two-dimensional outlier detection

    Hi all, I was wondering if you could give me some suggestions to detect two-dimensional outliers, i.e. for values depending on the variables. A...

    Started by bontus‎, 01-19-2012 10:39 AM
    outlier detection, two-dimensional
    • Replies: 1
    • Views: 3,397
    01-19-2012, 01:06 PM Go to last post
  9. Question Scientific Theories

    When evaluating a theory, which of these criteria do you think is the most important, the least important, and why? Do all of these criteria need to...

    Started by misty‎, 01-17-2012 07:42 PM
    • Replies: 9
    • Views: 3,568
    01-19-2012, 02:40 PM Go to last post
  10. queuing theory

    I have to solve this exercise and i stuck any help??? we have 20 scietists arrive per hour and the x-ray station can proccess 45 employees per hour....

    Started by nikosnikos‎, 01-19-2012 03:21 PM
    • Replies: 0
    • Views: 1,303
    01-19-2012, 03:21 PM Go to last post
  11. Hypothesis about bus arrivals distribution

    Hi I have collected data in the bus stop registering bus arrival times. Now I want to find the distribution that fits to this data. Trying in...

    Started by endri81‎, 01-20-2012 02:35 PM
    • Replies: 1
    • Views: 2,179
    01-20-2012, 03:52 PM Go to last post
  12. Help with data!!!

    Hi, I am new to the forum and would massively appreciate some help with some research I am doing. I am looking at a series of students marks over...

    Started by Milly‎, 01-21-2012 02:49 PM
    • Replies: 2
    • Views: 1,389
    01-21-2012, 06:52 PM Go to last post
  13. Difficulty with Rank-biserial correlation coefficient, N = 5

    Hi there, I am calculating Difficulty with Rank-biserial correlation coefficients in a spreadsheet using the following formula: rb = (2/n)*(Y1...

    Started by BOAZ‎, 01-22-2012 05:59 PM
    rank-biserial correlation
    • Replies: 6
    • Views: 7,783
    01-22-2012, 08:49 PM Go to last post
  14. Thumbs up Research Ethics

    If allowed, should animal research be limited to research that investigates cures for terminal illnesses, or should they continue to be used in any...

    Started by meshelle‎, 01-13-2012 12:57 PM
    • Replies: 13
    • Views: 3,637
    01-23-2012, 09:06 PM Go to last post
  15. Please Help with SPSS tests........or I may be dismissed from my program :(

    Hi All, I am about to be dismissed from my program because I can't get my stats right on my concept paper. I hired a statistician to help me, but...

    Started by phdstudent123‎, 01-23-2012 09:36 PM
    • Replies: 0
    • Views: 509
    01-23-2012, 09:36 PM Go to last post
  16. 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...

    Started by dougla‎, 01-19-2012 04:50 PM
    • Replies: 4
    • Views: 1,830
    01-24-2012, 12:24 PM Go to last post
  17. Variables for INDEX - can I include variables with differents units of measurement?

    Hi All, please help with this question. I want to create an index to measure natural resources. Could you kindly advise whether I can include...

    Started by SylviaS‎, 01-23-2012 01:37 PM
    • Replies: 2
    • Views: 1,762
    01-24-2012, 12:31 PM Go to last post
  18. Help need on 'Panel Corrected Standard Errors' in SAS

    I have panel regression to estimate with time fixed effects and correcting standard errors using 'Panel Corrected Standard Errors', where PCSE...

    Started by jb2755‎, 01-24-2012 02:25 PM
    • Replies: 0
    • Views: 3,140
    01-24-2012, 02:25 PM Go to last post
  19. Help to compute expected value of matrix product

    Hello, I have this problem to solve which is driving me crazy: I have the following matrices g = ' where .* here means Hadamard product and...

    Started by paolo72‎, 01-25-2012 05:56 AM
    • Replies: 0
    • Views: 3,306
    01-25-2012, 05:56 AM Go to last post
  20. 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...

    Started by DoctorG‎, 01-26-2012 05:44 PM
    autocorrelation function, feedback, systems, time series analysis
    • Replies: 0
    • Views: 1,202
    01-26-2012, 05:44 PM Go to last post
  21. Question Help Needed! SOS! Survey Scale Development and Analysis Implication

    Hey everyone! I found this forum while looking for answers to my issues and thought I would open my issues up to fellow members and see if anyone has...

    Started by jlee13‎, 01-27-2012 12:58 AM
    • Replies: 0
    • Views: 1,350
    01-27-2012, 12:58 AM Go to last post
  22. Question question about null hypothesis??

    here is my question: in my minor thesis, based on my theoretical framework, i have a hypothesis that stated that: "the score of group A is the same...

    Started by heymandy‎, 01-25-2012 11:54 PM
    • Replies: 7
    • Views: 2,975
    01-27-2012, 04:37 AM Go to last post
  23. In dire need of help!

    I took Stats 1 3.5 years ago and somehow the college forgot to mention i needed stats 2 to graduate and am now in it. I AM SO LOST and I have a...

    Started by JeremiahC‎, 01-26-2012 09:40 PM
    • Replies: 3
    • Views: 4,882
    01-27-2012, 05:01 AM Go to last post
  24. 1st, 2nd and 3rd derivatives of seven parameter double sigmoid function

    I want the 1st, 2nd and 3rd derivatives of the following seven parameter double sigmoid function Y = a + b /(1 + exp(-c(X-d))) – e/(1 +...

    Started by Ade Sol‎, 01-27-2012 11:33 AM
    • Replies: 1
    • Views: 2,679
    01-27-2012, 11:54 AM Go to last post
  25. Name of this test?

    Hello, what is one-way MANOVA with repeated measures called, if the single independent variable has only two levels (e.g. treatment and no...

    Started by Tikkuhirvio‎, 01-29-2012 09:26 AM
    • Replies: 1
    • Views: 1,345
    01-30-2012, 05:55 AM Go to last post
  26. Survey Analysis

    Hey Guy's I really need your help. I am not a statistician. I have to analyze surveys that have 6 observations (people) and 20 factors (food...

    Started by zqkal‎, 01-19-2012 03:07 PM
    data analysis, statistical research, survey analysis
    • Replies: 8
    • Views: 2,252
    01-30-2012, 12:20 PM Go to last post
  27. Statistical testing with very small sample

    Hi all, I have a problem which wasn't covered by any of my econometrics classes. I am going to run an economic experiment. Unfortunately, I just...

    Started by TimoV‎, 01-29-2012 06:26 AM
    • Replies: 3
    • Views: 2,580
    01-30-2012, 03:21 PM Go to last post
  28. Which statistical tool to be used? Please help!

    I need to compare crude oil commodity with other commodities like gold, copper and silver based on factors like inflation hedge, risk, return,...

    Started by sonam sethiya‎, 01-30-2012 09:36 PM
    • Replies: 0
    • Views: 1,626
    01-30-2012, 09:36 PM Go to last post
  29. Wilcoxon rank sum test on Cross Validation Results

    Hi Guys, I would like to compare the recognition times of two different object detectors. I have let's say 1000 labeled data. Then I do a 10x...

    Started by gajan‎, 01-30-2012 04:30 AM
    cross validation, wilcoxon rank sum test
    • Replies: 2
    • Views: 2,540
    01-31-2012, 03:33 AM Go to last post
  30. Lightbulb Sample size calculations for randomized controlled clinical trial

    Looking for a proper sample size formula for a randomized, double-blind, placebo-controlled clinical trial. There will be three arms for the trial (2...

    Started by jbw‎, 09-22-2010 08:04 PM
    • Replies: 2
    • Views: 10,215
    01-31-2012, 07:02 AM Go to last post
  31. mann whitney

    Hi all, a quick question from a newbie. I am doing a mann whitney test on differences in education regarding a likert scale item on a questionnaire...

    Started by soulman‎, 01-31-2012 08:19 AM
    • Replies: 0
    • Views: 1,801
    01-31-2012, 08:19 AM Go to last post
  32. Three-way mixed ANOVA - Post-hoc-analysis (Scheffé-test?)

    Hello everybody, I hope someone is able to help me here, because I'm desperate and can't find help anywhere :-(. English is not my first...

    Started by Aila‎, 01-31-2012 01:11 PM
    mixed anova, post-hoc, scheffé
    • Replies: 0
    • Views: 49,335
    01-31-2012, 01:11 PM Go to last post
  33. Bonferroni-Holm adjustment

    I have sort of a weird question. I am reading a journal article and basically the authors used a Kruskal-Wallis test to compare the median values of...

    Started by lancearmstrong1313‎, 01-30-2012 02:31 PM
    • Replies: 2
    • Views: 2,955
    01-31-2012, 01:18 PM Go to last post
  34. Help with statistical test.

    Hello all: I'm new to the forum and new to statistics. I'm a student doing a research on User Acceptance of Technology using a model known as...

    Started by Aldus‎, 01-31-2012 06:52 PM
    likert scale, pearson, regresion analysis, spearman, utaut
    • Replies: 0
    • Views: 1,924
    01-31-2012, 06:52 PM Go to last post
  35. Survey Sampling help needed guys

    Hi, I hope someone can give me some advice. I need to carry out a random sampling face to face survey in an area of 2014 properties to establish...

    Started by lisa131067‎, 02-02-2012 02:57 PM
    • Replies: 0
    • Views: 1,287
    02-02-2012, 02:57 PM Go to last post
  36. Hey Guys I'm new and I need help

    So basically, I have a very little knowledge about using SPSS, but I'm willing to learn. The problem is I'm having hard time on how to organize the...

    Started by adrianbrah‎, 01-16-2012 12:35 PM
    2 Pages
    1 2
    • Replies: 19
    • Views: 7,160
    02-03-2012, 01:00 PM Go to last post
  37. Help with interpreting chi-squared

    Hello everyone, I am new here, so I hope I'm posting my question in the right section! I'm having trouble interpreting the results of an old...

    Started by Millie‎, 02-01-2012 02:51 AM
    • Replies: 2
    • Views: 2,867
    02-04-2012, 12:46 AM Go to last post
  38. Analysis of Variance.

    Hi all, I have a one question about the analysis of variance. If I have to variables (e.g. A &B) and I want to deal with them as covariate to...

    Started by ghada8888‎, 01-15-2012 04:10 PM
    • Replies: 1
    • Views: 1,845
    02-04-2012, 04:42 PM Go to last post
  39. Calculating Sample Size for a prospective/longitudinal study

    I am an undergraduate conducting a literature review. I am wanting to discuss sample size among the papers I am critiquing. The papers I am...

    Started by Tiffiny‎, 02-05-2012 06:02 AM
    dissertation, power calculation, sample size
    • Replies: 0
    • Views: 3,341
    02-05-2012, 06:02 AM Go to last post
  40. Can I perform logistical regression on a sample of 28

    Hi there, Would be really grateful of some advice. I have a sample size of 28; 7 of which have a disease of interest. Is it possible to perform...

    Started by EmilyC‎, 02-07-2012 11:17 AM
    • Replies: 1
    • Views: 1,466
    02-07-2012, 11:48 AM Go to last post
  41. Comparing the mean of top and bottom quartiles

    Hi everyone, I am going over my research and I did an analysis of the mean of 6 variables on two quartiles drawn from a particular variable. I...

    Started by lolozgor‎, 02-08-2012 12:26 AM
    quartile, t-test
    • Replies: 2
    • Views: 3,869
    02-08-2012, 12:45 AM Go to last post
  42. Using an Independent t-test with Pre/Post data

    Hi to all who kindly read this. I've carried out an experiment involving a control and treatment group, and taken pre- and post- data from each...

    Started by cheekychica‎, 02-06-2012 08:51 PM
    • Replies: 6
    • Views: 4,537
    02-08-2012, 08:10 AM Go to last post
  43. Confidence interval and P-value

    Hello Guy’s thanks for your help in advance I am working on a research paper. I have large set of data (50,000) which allow me to use normal...

    Started by zqkal‎, 02-06-2012 02:32 PM
    • Replies: 3
    • Views: 2,288
    02-08-2012, 11:48 AM Go to last post
  44. Comparing activity budgets, before and after

    Hi all, I am a beginner, so I hope my question is not too stupid. I want to compare activity budgets of animals before and after an event. I...

    Started by Johanna_MonkeyStats‎, 09-08-2011 12:48 PM
    • Replies: 3
    • Views: 3,255
    02-08-2012, 03:05 PM Go to last post
  45. 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...

    Started by dockiss‎, 02-07-2012 02:00 PM
    • Replies: 9
    • Views: 2,193
    02-10-2012, 06:23 AM Go to last post
  46. basic question about variance of categorical data

    So I have some data regarding items people have selected, and the people are separated into groups. I'm interested in whether or not one group has...

    Started by 80past2‎, 02-06-2012 03:31 PM
    • Replies: 1
    • Views: 2,162
    02-10-2012, 06:33 PM Go to last post
  47. Experimental design survey and rank data analysis

    I want to conduct a survey in which i will give to participants in two treatments a rank order(basically they will have to rearrannge items in...

    Started by micdhack‎, 02-11-2012 03:25 AM
    • Replies: 0
    • Views: 1,603
    02-11-2012, 03:25 AM Go to last post
  48. Help with analysis

    Hi All, I am new to the forum. I have a specific question regarding one of the behavioral experiment we are conducting. This experiment is...

    Started by bluray‎, 02-12-2012 11:30 AM
    • Replies: 0
    • Views: 1,420
    02-12-2012, 11:30 AM Go to last post
  49. Considerations for choosing the right model

    Hello, I was wondering how one chooses the right model for a classification problem. Let's say I have a binary outcome variable, and many...

    Started by NN_STAT‎, 02-13-2012 03:07 AM
    • Replies: 1
    • Views: 2,666
    02-13-2012, 09:42 AM Go to last post
  50. Power calculation in Critiquing Tool

    Hi all I am currently trying to critique some orthopaedic research papers using the Downs and Black (1998) critiquing tool, but I am completely...

    Started by Roogle‎, 12-29-2011 06:03 PM
    alpha, calculation, critique, power, sample
    • Replies: 1
    • Views: 3,712
    02-13-2012, 02:20 PM Go to last post
  51. Traffic Survey

    Hey guys, I am a third year civil engineering student, who has somehow managed to avoid doing statistics all the way through life. That is up until...

    Started by Stuckonhomework‎, 02-13-2012 05:00 PM
    • Replies: 0
    • Views: 1,070
    02-13-2012, 05:00 PM Go to last post
  52. correlation coefficient

    Need quick help... A researcher investigated the relationship of age and ankle strength. She found the correlation coefficient to be -.85. What...

    Started by francija‎, 02-14-2012 12:51 AM
    • Replies: 5
    • Views: 3,148
    02-14-2012, 01:15 AM Go to last post
  53. 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...

    Started by DrDogg‎, 02-13-2012 05:18 PM
    • Replies: 2
    • Views: 1,944
    02-14-2012, 02:30 PM Go to last post
  54. Subseting a large dataset for analysis

    Hello all! Here's my situation: I have a data set that contains about 2.5 million observations, consisting of 13 variables in each row. Each row...

    Started by jtrubisz‎, 02-15-2012 07:23 PM
    • Replies: 4
    • Views: 2,274
    02-15-2012, 08:54 PM Go to last post
  55. Lightbulb Indirect Effect Report

    Hi All, I’m going to use the Soble macro (Preacher and Hayes, 2004, 2008) to test the indirect effect for my research variables. However, am...

    Started by ghada8888‎, 02-15-2012 05:29 PM
    • Replies: 4
    • Views: 3,969
    02-16-2012, 02:15 PM Go to last post
  56. Uncertainty for a star being between two values

    I have a set a of stars, each of which have a magnitude in the K band ( K ) and a 1 sigma uncertainty ( dK ) associated with it. For a program I'm...

    Started by omoplata‎, 02-17-2012 05:07 AM
    • Replies: 0
    • Views: 1,287
    02-17-2012, 05:07 AM Go to last post
  57. Thesis ANOVA help!

    So I'm looking at the differences between those with and without autism on a task measuring social cognition (I'm thinking of averaging percentage...

    Started by Puzzled‎, 02-18-2012 07:28 AM
    • Replies: 1
    • Views: 1,689
    02-18-2012, 07:32 AM Go to last post
  58. Mahalanobis Distance

    Hello, I have a question about working with Mahalanobis distance (MD). The materials I have on the matter say to enter the IVs for the analyses you...

    Started by parrot‎, 02-17-2012 12:27 PM
    • Replies: 2
    • Views: 1,983
    02-18-2012, 11:52 AM Go to last post
  59. Controlling for familywise error for large correlations matrix

    Hi there, I have 24 variables that I am currently running spearman's rank order correlations on in SPSS 19. I have read up a bit on familywise...

    Started by BOAZ‎, 02-19-2012 05:21 PM
    correlation, false discovery rate, familywise error, type i error
    • Replies: 0
    • Views: 1,784
    02-19-2012, 05:21 PM Go to last post
  60. Repeated Group Measurements, but Unpaired in that I can't Follow an Individual

    I run an assay on the same two groups, a treatment group and a control group, everyday. I then want to run a statistical test to see if the two...

    Started by jessica.ashley‎, 02-19-2012 05:23 PM
    repeated measures anova, unpaired data
    • Replies: 1
    • Views: 1,216
    02-19-2012, 05:38 PM Go to last post

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