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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: 18,620
    10-11-2014, 12:02 PM Go to last post
  1. 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: 2,752
    11-15-2011, 08:21 PM Go to last post
  2. Lightbulb Help with attribution/causality

    Hello everyone! I am new to this forum, but excited to become more involved :tup: I am currently a mathematics/statistics student and I am looking...

    Started by JesusWalks‎, 08-03-2011 12:49 PM
    attribution, causality, ecological statistics, model, statistics
    • Replies: 1
    • Views: 2,749
    08-04-2011, 05:23 PM Go to last post
  3. Product pricing question

    Hello all. It's been a long time since I've been on this forum. Glad I was able to find it again. I'm afraid my stats experience is limited to...

    Started by vangogh228‎, 12-08-2008 07:41 AM
    • Replies: 0
    • Views: 2,747
    12-08-2008, 07:41 AM Go to last post
  4. how to obtain p-value from test statistic

    I am familiar with how to obtain the p-value from the t-statistic - the t-statistic is calculated by looking at the difference in means in two...

    Started by dliner‎, 12-29-2016 03:26 PM
    mathematica, normality, statistics
    • Replies: 0
    • Views: 2,744
    12-29-2016, 03:26 PM Go to last post
  5. Event Study Methodology - Event Window

    Hi, I am currently beginning an event study on the effect of the Fukushima crisis on U.S. electrical utility companies. I am completely new to...

    Started by juxtaposition‎, 03-09-2012 07:52 AM
    • Replies: 0
    • Views: 2,743
    03-09-2012, 07:52 AM Go to last post
  6. Need large data sets

    Hello, I'm doing some Q/A work on a new app for data visualization. I can generate my own random data sets, but I'd like to use some real-world...

    Started by Wornways‎, 03-01-2009 03:40 AM
    • Replies: 2
    • Views: 2,742
    03-10-2009, 05:55 PM Go to last post
  7. Trouble with a dichotomous decision study

    Any help appreciated: Have a study with video clips and a Yes / No answer. There is a correct answer. There are ~20 (but this can be changed) clips...

    Started by Chiaroscuro‎, 09-09-2009 11:10 AM
    • Replies: 0
    • Views: 2,742
    09-09-2009, 11:10 AM Go to last post
  8. What model should I use? Mixed-effect model?

    Hello guys, I really hope you can help me with this. Any ideas/suggestions are welcome. My main goal is to create a model that predicts which...

    Started by Marvin85‎, 03-16-2016 02:22 PM
    • Replies: 13
    • Views: 2,742
    06-14-2016, 11:05 PM Go to last post
  9. Curve parameters

    Hi all, I have a curve with an intercept, slope, and quadratic factor. Now, I would like a draw a curve that is one standard deviation above this...

    Started by nrstein1‎, 02-02-2012 03:15 PM
    • Replies: 8
    • Views: 2,738
    03-13-2012, 03:10 PM Go to last post
  10. weibull distribution

    i'm studying film life cycle using the weibull distribution. given the survival function, there exists the hazard rate, or the failure rate, a point...

    Started by angelo_s‎, 02-04-2008 12:50 PM
    • Replies: 0
    • Views: 2,737
    02-04-2008, 12:50 PM Go to last post
  11. Smile How to combine Probability Distribution Function of Two correlated variables?

    I have the probability distribution Functions(PDF) of the wind speeds of two wind sites which have a certain Pearson's correlation coefficient. How...

    Started by dinesh‎, 06-04-2012 05:21 PM
    convolution, correlation, dependent, probability distributions, regression
    • Replies: 0
    • Views: 2,737
    06-04-2012, 05:21 PM Go to last post
  12. A bit rusty could someone give me a shove in the right Direction Please

    Hi guys , I'm a management PhD student. I did a module on SPSS 14 before having to take a year out. I'm now starting to write up a bit of my thesis...

    Started by arobbo‎, 08-25-2008 07:48 AM
    • Replies: 1
    • Views: 2,733
    08-25-2008, 11:05 AM Go to last post
  13. Standard error of a weighted composite score

    I would like to calculate the standard error of a weighted composite score. The composite score is based on the sum of a respondent's rating to a...

    Started by daisystat‎, 11-19-2013 03:44 PM
    • Replies: 2
    • Views: 2,733
    11-20-2013, 03:10 PM Go to last post
  14. Can they called unequal sample sizes and t-test/ANOVA?

    I would like to ask all of you about some queries. Apologies for my poor English. I tried to search for previous posts and also Google but cannot...

    Started by cookiemonster‎, 05-02-2011 03:09 AM
    • Replies: 0
    • Views: 2,732
    05-02-2011, 03:09 AM Go to last post
  15. Uniform minimum variance unbiased estimator

    Hello, I need help with the develpment of this exercise that I'm trying to solve. Let \widehat{\sigma} be the U.M.V.Uestimate of \sigma when \mu...

    Started by sanmath‎, 03-18-2013 12:21 AM
    • Replies: 0
    • Views: 2,732
    03-18-2013, 12:21 AM Go to last post
  16. Centering level-1 interaction terms in HLM

    Dear all, I’m running multilevel analyses with HLM and wish to examine an interaction between two level 1 predictor variables. Following...

    Started by Linda Mueller‎, 12-21-2016 09:18 AM
    centering variables, hlm7, moderation, multi level
    • Replies: 1
    • Views: 2,732
    12-21-2016, 01:24 PM Go to last post
  17. Unconditional covariance matrices from multivariate GARCH specifications

    Hi all. I thought someone here might be able to help me prove some results which I have not been able to find in journals. Can anyone help me...

    Started by mads_st‎, 07-11-2011 12:07 PM
    • Replies: 0
    • Views: 2,730
    07-11-2011, 12:07 PM Go to last post
  18. Scientific articles about statistics

    I thought we could gather various interesting articles here. A general rule is that it should be about statistical methods or mathematical...

    Started by Englund‎, 03-14-2013 03:28 PM
    • Replies: 2
    • Views: 2,729
    03-14-2013, 03:49 PM Go to last post
  19. Paired Vs unpaired t-test - which one to use?

    Good morning, I am a little stuck - I understand the difference between the two tests and am happy with written examples in a stats book I found....

    Started by Emuk81‎, 08-18-2014 03:58 AM
    • Replies: 1
    • Views: 2,722
    08-18-2014, 07:12 AM Go to last post
  20. measure of effect size for categorical association

    Hello, I am having difficulties in wrapping my head around an issue regarding chi-squared statistic, Cramer's V, and Cohen's measure of effect...

    Started by gianmarco‎, 11-03-2016 03:37 AM
    • Replies: 1
    • Views: 2,721
    11-03-2016, 08:20 AM Go to last post
  21. Unbalanced sample size

    Hello I have a question... what can an unbalanced sample cause ? For example, I have 2 groups, and I want to either use a t-test, or some...

    Started by NN_STAT‎, 03-22-2012 10:18 AM
    • Replies: 1
    • Views: 2,717
    03-22-2012, 11:12 AM Go to last post
  22. breaking data into training and testing (hold-out) sets

    Dear Stats Forum, I am a grad student with an introductory stats background. For my research, I'm conducting an experiment to compare the predictive...

    Started by hollywas‎, 07-21-2012 01:30 PM
    • Replies: 3
    • Views: 2,716
    07-21-2012, 04:47 PM Go to last post
  23. Help with dissertation

    Hello everyone. I need someone to make up a table for me for my dissertation. I've got the answers to it but can't figure out how the table can be...

    Started by Vicks‎, 03-19-2011 09:55 AM
    • Replies: 1
    • Views: 2,714
    03-19-2011, 09:58 AM Go to last post
  24. setting parameters in G*power for correlation tests

    Hello, everyone :) Need your help on how to set parameters in G*power... I am doing two very simple tests: one on pearson correlation between...

    Started by invisibleme‎, 03-29-2013 01:28 PM
    correlation, partial correlation, power
    • Replies: 0
    • Views: 2,713
    03-29-2013, 01:28 PM Go to last post
  25. Applicability of Bayes to Contingency Tables (Chi-Squared)

    Is it possible to apply the Bayes factor to tests of/for independence/homogeneity (Chi-Square)? You can find a file below. The contingency table...

    Started by trulu‎, 10-05-2016 05:26 AM
    • Replies: 1
    • Views: 2,711
    10-25-2016, 08:18 AM Go to last post
  26. Help with repeated measure analysis.

    Hi there, I am confused in how to analyze a set of experimental data. I consulted a number of books and did extensive research on the net, but could...

    Started by lafcina‎, 04-28-2010 04:02 AM
    • Replies: 0
    • Views: 2,710
    04-28-2010, 04:02 AM Go to last post
  27. What can the standard errors tell me?

    Hello dear forum members! I wanted to share with you a couple graphs and seek your wisdom on the insights that I may be omitting. According to...

    Started by kiton‎, 11-06-2016 12:22 PM
    • Replies: 0
    • Views: 2,709
    11-06-2016, 12:22 PM Go to last post
  28. Repeatability and Reproducibility

    Hi, I'm new to this and I'm not exactly a math expert. I am carrying out research in a lab, and I want to test repeatability and reproducibility of...

    Started by Newbe123‎, 02-20-2013 05:17 AM
    repeatability
    • Replies: 2
    • Views: 2,706
    02-21-2013, 10:25 AM Go to last post
  29. Uncertainty

    Hi there, If I take measurements every minute for a whole hour, and I know the uncertainty of a single measurement, is it possible to calculate...

    Started by amarshall17‎, 05-19-2009 08:24 PM
    • Replies: 1
    • Views: 2,704
    05-20-2009, 06:42 PM Go to last post
  30. Relative Risk calculation

    Hi bit of help would be much appreciated for what is probably a bit of a silly question. I am trying to calculate relative risks of an adverse...

    Started by asaleh‎, 09-29-2014 06:27 AM
    • Replies: 6
    • Views: 2,703
    10-06-2014, 04:41 PM Go to last post
  31. Ordinal Regression vs Spearmans Rank Correlation

    Hello, My name is William, I am currently at my last year at Newcastle University, UK carrying out research for my dissertation on how social...

    Started by wberner11‎, 04-01-2015 05:45 AM
    dissertation, regression analysis, spearmans rank
    • Replies: 3
    • Views: 2,701
    04-01-2015, 06:44 AM Go to last post
  32. interpreting SS in permutational (M)ANOVA with adonis

    Dear all, I want to use the adonis() function in R package vegan to do a permutational univariate analysis of variance (instead of multivariate)...

    Started by pubert‎, 06-28-2012 10:46 AM
    • Replies: 0
    • Views: 2,699
    06-28-2012, 10:46 AM Go to last post
  33. Desperate urgent help

    Hi everybody, First, let me say how much I appreciate your help here. Its a life saver. I have a presentation tomorrow on my research and I am...

    Started by ruzbayhhi‎, 02-17-2009 07:00 AM
    • Replies: 3
    • Views: 2,698
    02-20-2009, 02:07 AM Go to last post
  34. need a little hint..... Rosenberg measure of self esteem

    Hey everyone, I am not the most statistacally minded person so please talk to me like you would to a 4 year old :eek: I am conducting a study...

    Started by Thesis12‎, 02-05-2010 05:24 PM
    • Replies: 3
    • Views: 2,696
    03-07-2010, 10:58 AM Go to last post
  35. Good Book on Mathematical Statistics

    I'm a mostly self-trained analyst with degrees in the social sciences but not in statistics. I'm looking to improve my knowledge of the mathematics...

    Started by elanmorin‎, 08-27-2014 03:08 PM
    • Replies: 9
    • Views: 2,695
    09-17-2014, 07:09 AM Go to last post
  36. Need help in hypotheses testing. Interpretation of AMOS output

    Hi, I am struggling to understand how to test the hypothesized relationships in my model. I've got 4 hypotheses to test, all 4 are hypothesized...

    Started by deto4ka‎, 04-27-2013 07:42 AM
    • Replies: 10
    • Views: 2,694
    04-28-2013, 06:29 AM Go to last post
  37. 10 point scale and central limit theorem

    I want to do a comparative analysis between two means of groups. I want to hear opinions on two things. 1. I asked participants to rate me...

    Started by micdhack‎, 03-31-2012 08:43 AM
    • Replies: 6
    • Views: 2,693
    04-03-2012, 05:20 AM Go to last post
  38. Statistical matching

    Hi Folks, Am New to this statistical analysis domain, but have a problem at hand. I have a list of movies and each movie have various attributes...

    Started by amit_tomar‎, 04-07-2011 04:36 PM
    • Replies: 0
    • Views: 2,687
    04-07-2011, 04:36 PM Go to last post
  39. Citation needed for removing 3 Stdev outliers

    Hi, In a research paper, I had remove values that were 3 standard deviations away from the mean. The values simply didn't make any sense. I have...

    Started by civiloscar‎, 07-30-2012 02:21 PM
    citation, outliers, standard deviation
    • Replies: 3
    • Views: 2,687
    07-30-2012, 04:51 PM Go to last post
  40. Homogenity and Heterogenity

    Hello everyone. I have read that Homogenity and Heterogenity are used for population that have/do not have accordingly the same variance σ^2. Does...

    Started by dervast‎, 05-06-2010 10:29 AM
    • Replies: 1
    • Views: 2,684
    05-08-2010, 01:09 AM Go to last post
  41. Adding random error to ordinal IV to make it more continous

    In survey data, attududinal questions are often coded 1-5, 1-7, 0-10 etc. These kinds of variables are often reffered to as approximately...

    Started by Ullsokk‎, 10-07-2011 03:30 AM
    • Replies: 2
    • Views: 2,684
    10-07-2011, 09:37 AM Go to last post
  42. 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
    derivatives
    • Replies: 1
    • Views: 2,678
    01-27-2012, 11:54 AM Go to last post
  43. Where to find data (morning running vs evening running)?

    Hi, I am trying to do some analysis on running time: morning vs evening. Does anyone know where I can find data? Thanks in advance. John

    Started by john2012‎, 05-02-2012 10:29 AM
    • Replies: 9
    • Views: 2,674
    05-02-2012, 05:42 PM Go to last post
  44. Using Mann-Whitney test when all values in one data set are zero (SPSS vs Graphpad)

    I would be very grateful for advice on the following problem: I am examining the frequency in which political issues are reported in the national...

    Started by sunilaup‎, 08-27-2012 02:38 PM
    • Replies: 5
    • Views: 2,673
    08-29-2012, 03:50 AM Go to last post
  45. Poisson point process

    I came across this in a network model: Distribute N points according to a homogeneous Poisson point process in a two-dimensional space of unit...

    Started by spinningfeather‎, 12-06-2016 02:24 PM
    • Replies: 0
    • Views: 2,672
    12-06-2016, 02:24 PM Go to last post
  46. How many people are needed for a valid sample?

    Question I have to answer: In order to collect a survey of opinions, I would like to take a sample of a city with a population of 600,000 people....

    Started by frieswiththat‎, 10-07-2011 06:07 PM
    • Replies: 0
    • Views: 2,671
    10-07-2011, 06:07 PM Go to last post
  47. Arrow My professor told me that a t-test wasn't the correct procedure to use in a report

    In my report it states: "the incidence of vomiting after treatment showed a 9% decrease in the control group, which was not significantly...

    Started by jenclark242‎, 10-01-2010 03:13 PM
    • Replies: 2
    • Views: 2,669
    10-02-2010, 01:34 PM Go to last post
  48. 2 Sample T Test for Nonnormal data

    Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

    Started by goducks13‎, 04-05-2013 08:48 PM
    • Replies: 10
    • Views: 2,669
    04-09-2013, 07:13 PM Go to last post
  49. Question Help with thesis research on social bookmarking

    Hi, I'm writing my thesis right now and I must admit that I underestimated the complexity of the required statistics a bit. My description is quite...

    Started by HFFL‎, 09-01-2008 12:21 PM
    • Replies: 1
    • Views: 2,668
    11-07-2008, 09:54 PM Go to last post
  50. Small difference but still significant?

    I hae sample size of 67 participants. They took a pre and post knowledge survey. The maximum score was 14 answers correct. I run a pair ttest. These...

    Started by Marvin85‎, 11-10-2014 02:38 PM
    pvalue, significant
    • Replies: 11
    • Views: 2,668
    11-30-2014, 03:42 AM Go to last post
  51. Repeated measures with different cohorts

    Dear all, I have data from 3 different art groups (orchestra, dance, musical theatre) collected in 3 different times of measure. Data is...

    Started by Subcora‎, 10-27-2016 06:36 AM
    cohort, repeated measures
    • Replies: 0
    • Views: 2,667
    10-27-2016, 06:36 AM Go to last post
  52. 4 simultaneous non-independent measures – should nested ANOVA work?

    Hi all, this is my first time posting here, but I’m very stuck. I have to analyze data from an animal behavior experiment. I have 3 strains, with 20...

    Started by anvee‎, 08-14-2014 02:35 PM
    animal behavior, behavioral experiment, jmp, nested anova, preference
    • Replies: 0
    • Views: 2,664
    08-14-2014, 02:35 PM Go to last post
  53. different intercept with Multinomial vs Binomial Logistic?

    I have run the same set of Xi on the same data, using both Multinomial and Binomial logistic regression via SPSS. (The outcome in both cases was...

    Started by chipsens‎, 09-06-2011 03:02 PM
    logistic regression
    • Replies: 0
    • Views: 2,663
    09-06-2011, 03:02 PM Go to last post
  54. S-shapec urve goodness of fit

    hi, I'm looking for a statistical test to prove (statistically) that the cumulative curve is S-shape When I try to look for answer I get 2...

    Started by atlasm‎, 12-07-2016 01:44 AM
    data, s-shape, test of significance
    • Replies: 0
    • Views: 2,662
    12-07-2016, 01:44 AM Go to last post
  55. Binomial Test that does not assume indepence? (using a repeated measures design)

    Hi, I am looking for a way to analyze data for the following experiment: subjects were presented with two separate acoustic signals at the same...

    Started by ochracea‎, 08-22-2009 10:23 PM
    • Replies: 1
    • Views: 2,659
    08-23-2009, 01:08 PM Go to last post
  56. Which test should I use?

    Working on a medicine research paper here, really hoping someone can help me out. I have a group of patients for which I have data relating to...

    Started by MastahRiz‎, 03-28-2011 10:32 PM
    • Replies: 5
    • Views: 2,655
    04-06-2011, 11:00 AM Go to last post
  57. 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: 2,654
    02-13-2012, 09:42 AM Go to last post
  58. Post PAVA - isotonic regression

    Hello, I'm searching for a research, and I hope I can get your help. I have an article showing an estimator for a cdf F, Fn, based on a function...

    Started by nunoadiga‎, 04-09-2011 11:27 AM
    • Replies: 0
    • Views: 2,653
    04-09-2011, 11:27 AM Go to last post
  59. beating the rules at discrete sampling

    hi, I am looking at the question of how to sample rare occurances, like a rare defect in a manufacturing line. If I use the standard sample size...

    Started by rogojel‎, 06-10-2015 01:32 PM
    discrete data, proportions sample size
    • Replies: 4
    • Views: 2,653
    06-11-2015, 02:42 AM Go to last post
  60. 3x3 factorial design, repeated outcome measure

    I have a 3x3 factorial design (3 levels of treatment and 3 different environments) - the outcome is a repeated measurement taken at every week - the...

    Started by oncearunner‎, 10-06-2014 05:29 PM
    • Replies: 1
    • Views: 2,650
    10-07-2014, 02:53 AM Go to last post

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