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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: 18,731
    10-11-2014, 12:02 PM Go to last post
  1. a data modeling question

    Just had a job interview with a bank. They asked me the following questions: 1. Their credit card offers reward points. They want to predict...

    Started by aha123‎, 03-05-2012 02:26 AM
    • Replies: 1
    • Views: 1,676
    03-05-2012, 04:26 AM Go to last post
  2. Appropriate sample size for unusual "populations"

    There seems to be a lot of literature about determining sample size based on population, margin of error and confidence level. This seems difficult...

    Started by ahhk22‎, 08-15-2016 10:35 PM
    sample size determination
    • Replies: 2
    • Views: 881
    08-16-2016, 08:22 PM Go to last post
  3. 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: 49,411
    01-31-2012, 01:11 PM Go to last post
  4. Simple regression

    Hi, I am having a problem and I know a way to solve but don't know how to statistically implement it. I'm trying to summarize the problem in a...

    Started by aimanusarma‎, 12-19-2009 03:44 AM
    • Replies: 4
    • Views: 2,822
    12-25-2009, 09:18 PM Go to last post
  5. Thumbs up Significance in a Yes/No question

    Hi, So I'm working on a research project that is looking into whether there's a statistically significant difference between pilots in their...

    Started by airwee‎, 04-30-2011 03:45 PM
    • Replies: 2
    • Views: 5,731
    06-22-2011, 02:01 PM Go to last post
  6. one sample t-test alternative

    Hello, I hope someone can help me, because I am getting crazy with this. Imagine the following scenario: I have several participants. Each...

    Started by ajestudillo‎, 04-09-2014 11:41 AM
    • Replies: 13
    • Views: 2,233
    04-10-2014, 07:08 AM Go to last post
  7. Can sensitivity be calculated in non-binary variables?

    Hi everyone, Is there any analogous measure of sensitivity and specificity for non-binary variables? For example, if I want to study the...

    Started by AJLRB‎, 07-19-2017 03:17 AM
    • Replies: 2
    • Views: 417
    07-20-2017, 05:27 AM Go to last post
  8. Unhappy Help with Dissertation Survey Data Input in SPSS

    Hi all, I was looking for some help with inputting the data from my survey's into SPSS for analysis. I've conducted a survey on Internet Banking...

    Started by AJV171‎, 03-16-2013 08:06 AM
    • Replies: 0
    • Views: 1,288
    03-16-2013, 08:06 AM Go to last post
  9. Question Correlations between groups of Likert-type answers – choice of statistical test

    I'm looking for the optimal way to interpret some data, so any constructive advice will be appreciated. A questionnaire with 3 groups of 50...

    Started by ajvar‎, 05-31-2012 03:41 PM
    correlation, likert, test
    • Replies: 1
    • Views: 41,309
    05-31-2012, 05:02 PM Go to last post
  10. Post Correlation coefficient repeated measures

    Hi Everyone, I would like to measure the correlation between two quantitative variables. These variables measure the same thing but are obtained...

    Started by AkaKiwi‎, 03-23-2014 06:30 AM
    • Replies: 5
    • Views: 2,945
    03-26-2014, 04:17 AM Go to last post
  11. Kappa coefficient for repeated measures

    Hi Everyone, I know that a kappa coefficient for repeated measures exists, but I didn't find the article in free access (Kraemer HC. Extensions of...

    Started by AkaKiwi‎, 05-22-2014 04:59 AM
    • Replies: 0
    • Views: 2,358
    05-22-2014, 04:59 AM Go to last post
  12. Post Principal component analysis (PCA) on clustered data

    Hi Everyone, I am analysing data about physical condition tests on students belonging to different type of schools (general, professional,...

    Started by AkaKiwi‎, 03-18-2016 10:40 AM
    • Replies: 3
    • Views: 1,667
    03-21-2016, 03:18 AM Go to last post
  13. Theory of p value matching????

    I am required to write about this for my lit review. I asked the stats lecturer but he said he never heard of it! could anyone hazard a guess to...

    Started by akav‎, 11-13-2015 10:16 AM
    • Replies: 7
    • Views: 1,602
    11-13-2015, 02:25 PM Go to last post
  14. data analysis for likert scale

    i have a group of variables being measured on a likert scale from 1 to 5, the agreement or disagreement of these variables will help me know the...

    Started by akluima‎, 10-01-2012 04:30 AM
    • Replies: 2
    • Views: 1,676
    10-01-2012, 08:39 AM Go to last post
  15. Measuring Neural Network Performance

    Hi all, I have a set of matrix where the last column is the RESPONSE VECTOR. I have performed a backprop NN (neural network) in order to...

    Started by akmaltk96‎, 07-07-2008 09:11 PM
    • Replies: 4
    • Views: 5,240
    12-21-2009, 04:14 PM Go to last post
  16. 2 or 3 way ANOVA?

    Hi I'm not sure whether to use a 2 or 3 way ANOVA. My project I'm working on is focussing on one antibiotic and seeing how toxic it is at...

    Started by alanie‎, 05-25-2015 09:33 AM
    anova
    • Replies: 1
    • Views: 1,152
    05-26-2015, 07:04 AM Go to last post
  17. How to analyse a set of data without normality and homoscedasticity?

    Hello, I'm a postgraduate student in Biology. From some time on, I wanted to publish a paper regarding the affectance of temperature to the shell...

    Started by Alaris‎, 08-28-2015 02:08 AM
    • Replies: 0
    • Views: 1,040
    08-28-2015, 02:08 AM Go to last post
  18. Which version of the Chi-Square test should I use?

    Hello, I am doing an honors project at my university. It is for my stat's class and due to the very short length of our class we did not cover the...

    Started by Aldin Malkoc‎, 11-09-2013 09:53 PM
    • Replies: 0
    • Views: 938
    11-09-2013, 09:53 PM Go to last post
  19. 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: 1,942
    01-31-2012, 06:52 PM Go to last post
  20. Need assistance to conduct a validation of research instrument

    I'm completing a PhD degree and need help from five PhD holders in order to conduct an instrument validation (face value and content validation). The...

    Started by Aldus‎, 04-29-2012 06:48 PM
    instrument validation, validity, validity testing
    • Replies: 0
    • Views: 1,729
    04-29-2012, 06:48 PM Go to last post
  21. Have population, use inferential stats? Non-normal dependent variable, what to do?

    Statistics people! I have two questions for you. I am NOT a statistician so please be nice and answer simply :) Background: We are looking at...

    Started by alea iacta est‎, 06-19-2014 05:22 PM
    inferential statistics, interaction, logistic regression, normal distribution, population
    • Replies: 1
    • Views: 1,336
    06-20-2014, 09:07 PM Go to last post
  22. Can I use regression to increase sample size of survey responders?

    I have a question about how I can extrapolate responses from a survey to apply to the entire population with a decent level of confidence and...

    Started by alebertoni‎, 07-24-2013 08:09 AM
    extrapolation, regression, sample size
    • Replies: 1
    • Views: 1,198
    07-24-2013, 05:26 PM Go to last post
  23. Question attributes of individuals in discrete choice tasks

    Hello stat talkers, :wave: I'm currently working on a marketing (discrete choice) project concerning brand choice and I stumbled upon some questions...

    Started by alex.wendland‎, 11-16-2009 05:08 AM
    • Replies: 3
    • Views: 3,431
    11-23-2009, 04:23 AM Go to last post
  24. compute true values monte carlo simulation

    Hello, I'm reading an article in which a monte carlo simulation is performed, but have the following problem: the data is generated as:...

    Started by alex76‎, 06-10-2010 03:34 PM
    2 Pages
    1 2
    • Replies: 16
    • Views: 6,724
    07-04-2010, 05:19 AM Go to last post
  25. confidence interval for the median(Wilcoxon)

    Hello.I have a project with subject the confidence interval for the median(Wilcoxon) and i can't find any information.I would appreciate it if...

    Started by alexandros‎, 06-16-2014 02:35 PM
    • Replies: 0
    • Views: 1,226
    06-16-2014, 02:35 PM Go to last post
  26. Multi Modal Example trying to assess correct Statiscal approach

    I am trying to figure out the best statistical approach to address a problem. I am looking at 100 retail stores and looking at their hourly traffic....

    Started by AlexC200‎, 01-12-2016 01:10 PM
    multi-variable, statiscal approach
    • Replies: 1
    • Views: 1,176
    01-12-2016, 01:52 PM Go to last post
  27. 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: 12,649
    10-20-2011, 11:45 PM Go to last post
  28. Red face How to create a representative sample?

    Hello to all! :) I have recently launched a survey to students of specific universities among European countries and got nearly 3000 replies....

    Started by alexia_spyr‎, 11-03-2013 08:10 PM
    representativeness, sample
    • Replies: 2
    • Views: 2,445
    11-04-2013, 09:39 PM Go to last post
  29. Identifying the better "performers" in groups of uneven population

    Hello. If the answer to this question is out there, the internet has hidden it pretty well... I've got 5 groups, each with a different...

    Started by AlexP‎, 12-04-2012 11:00 AM
    • Replies: 1
    • Views: 890
    12-04-2012, 04:29 PM Go to last post
  30. Augment a sample to improve goodness-of-fit

    Hi all, Lets say I have a sample from a normal (or any other) distribution, and the goodness-of-fit is reasonable. It is possible to improve this...

    Started by alextb‎, 06-24-2013 05:05 AM
    goodness-of-fit
    • Replies: 0
    • Views: 1,431
    06-24-2013, 05:05 AM Go to last post
  31. Is this method to post-hoc determine the sample size a known one?

    Hi all! In the last weeks I'm facing the issue of determining if my sample is big enough to describe the world population. Apart from the usual...

    Started by ale_tuz‎, 05-05-2014 02:39 AM
    • Replies: 3
    • Views: 1,834
    12-12-2014, 08:16 AM Go to last post
  32. Question What statistical test do i need to run?

    Hi there folks, I'm having a little difficulty choosing what statistical test i need to run, I've conducted a series of behavioural experiments,...

    Started by alflo‎, 12-16-2013 06:56 PM
    biology, help me!, statistical test
    • Replies: 0
    • Views: 1,168
    12-16-2013, 06:56 PM Go to last post
  33. t-test or Mann-Whitney test

    I am comparing two samples of IPO (Initial public offerings) companies using t-test and Wilcoxon Mann Whitney Test. But since I am comparing 102 IPO...

    Started by Ali Ali‎, 08-25-2013 10:50 AM
    • Replies: 7
    • Views: 2,366
    08-26-2013, 04:39 PM Go to last post
  34. white test for heteroskedasticity

    Hi everyone In STATA, how to inerpret the results of the heteroskedasticity test? I typed in imtest, white to do the test, and got these results:...

    Started by Ali Ali‎, 09-15-2013 08:50 PM
    • Replies: 0
    • Views: 3,274
    09-15-2013, 08:50 PM Go to last post
  35. Mancova help

    Hello everyone, I wanted to test the effectiveness of a new teaching method. I asked 5 teachers to use this new method in their classes, and used...

    Started by Ali H‎, 06-30-2011 08:58 AM
    • Replies: 0
    • Views: 1,445
    06-30-2011, 08:58 AM Go to last post
  36. Frequency data analysis - repeated measures, between groups

    Hi, I am using SPSS and testing frequency data before and after a treatment, plus follow-up. The variable I am looking at is frequency of symptoms...

    Started by Alice‎, 10-28-2012 08:35 PM
    • Replies: 3
    • Views: 1,481
    11-01-2012, 06:17 PM Go to last post
  37. GOF / Diagnostics for a GLM Binomial-Logit Family Model STATA

    Hello, I am using a GLM Binomial-Logit Family Model. I am using this model because my dependent variable is a proportion. Having carried out the...

    Started by Alicia2010‎, 05-20-2010 03:59 AM
    • Replies: 0
    • Views: 4,171
    05-20-2010, 03:59 AM Go to last post
  38. Question Difference between VCV by inverting Hessian at ML and by Hierarchical Bayes

    Let's say we have a multimomial logit problem and we find the best beta coeffcients b* aggregating all units. The inverse of the Hessian at b* gives...

    Started by alik3954‎, 06-10-2014 09:59 AM
    bayesian, bayesian beta regression, bayesian inference, maximum likehood, monte carlo
    • Replies: 0
    • Views: 1,110
    06-10-2014, 09:59 AM Go to last post
  39. Monte Carlo simulation: how many runs?

    Hi, Most papers I read related to Monte Carlo (MC) simulation method say that there is no rule on the minimum number of runs required. However, in...

    Started by AlinaN‎, 04-05-2015 11:11 PM
    monte carlo
    • Replies: 12
    • Views: 6,110
    04-07-2015, 06:21 AM Go to last post
  40. Trying to find MS Excel Wilcoxon Rank Sum test example

    I am a pharmacy student doing a 4th year (final year) Capstone Research Project. I am attempting to run my data utilizing a Wilcoxon Rank Sum Test...

    Started by alkamas‎, 11-29-2015 05:32 PM
    help please, wilcoxon rank sum test
    • Replies: 1
    • Views: 1,249
    12-01-2015, 08:55 PM Go to last post
  41. 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: 4,947
    11-13-2011, 05:14 PM Go to last post
  42. sum of truncated Normal Variables

    Hello all, I am trying to find if there exists a closed solution for the following: X~N(u,var) {normal dist) Y~N((u,var)|Y>a) {truncated normal...

    Started by alondo‎, 08-21-2012 03:23 AM
    distibution, normal, probability, sum of normal, truncated
    • Replies: 0
    • Views: 3,185
    08-21-2012, 03:23 AM Go to last post
  43. Statistical Independence

    I'm trying to give my students a brief introduction to chi-square testing, but there's something that's a little confusing to me regarding the...

    Started by alphaqn69‎, 04-08-2011 04:38 PM
    • Replies: 1
    • Views: 3,420
    04-27-2011, 11:02 PM Go to last post
  44. non-parametric test for repeated measurement

    Hello everyone, I would like to know if some non-parametric test is available to asses wether 2 samples come from the same distribution for repeated...

    Started by alstublieft‎, 11-14-2008 11:16 AM
    • Replies: 4
    • Views: 5,372
    11-17-2008, 04:34 AM Go to last post
  45. statistical power of a General Linear Mixed Model with repeated measurements

    Hello, I would like to be able to calculate the statistical power of a General Linear Mixed Model. This model is applied on longitudinal data on...

    Started by alstublieft‎, 04-15-2009 07:37 AM
    • Replies: 0
    • Views: 3,773
    04-15-2009, 07:37 AM Go to last post
  46. Median or Mean vs Data distribution

    Hi, I am stuck at this point in my thesis in selected between Median and Mean. My data and work: I have a set of data X, and for each data y...

    Started by alwaqfi‎, 12-25-2016 09:04 AM
    • Replies: 3
    • Views: 3,239
    12-26-2016, 09:50 AM Go to last post
  47. Using statistical analysis to show hybrid performance gains

    Are there any statistical analysis techniques that i can use for the following scenario? As part of my report, i was asked to study the fuel...

    Started by amahesh2012‎, 07-28-2011 07:16 AM
    • Replies: 1
    • Views: 1,611
    08-04-2011, 02:38 PM Go to last post
  48. Best test to use?

    Hi Everyone, I am trying to design a medical study and having difficult for teh best to use, in summary: Stage 1: Patients are classified into...

    Started by amanco‎, 09-15-2011 06:02 PM
    • Replies: 0
    • Views: 1,636
    09-15-2011, 06:02 PM Go to last post
  49. Which test?

    I am trying desperately to figure out which test I should use. I want to test if self-efficacy survey results and/or internship opportunities result...

    Started by AMarbutt‎, 09-20-2014 04:52 PM
    • Replies: 1
    • Views: 1,929
    09-21-2014, 06:15 AM Go to last post
  50. 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: 2,718
    05-20-2009, 06:42 PM Go to last post
  51. How to do a Validation Study?

    My professor has asked me to do a validation study but I have never done one before and don't know what methodology or statistics to use. Basically...

    Started by amber82‎, 12-16-2014 11:44 PM
    methodology, scales, validate scale, validation
    • Replies: 1
    • Views: 5,154
    12-17-2014, 01:05 AM Go to last post
  52. Univariate vs Multivariate results

    Hi, Am I correct in assuming that if a variable was found to be good predictor in univariate analysis, it should also be found to be a good...

    Started by ambij‎, 03-08-2015 05:19 AM
    multivariate-analysis, multivariate-regression, predictor, univariate
    • Replies: 0
    • Views: 1,143
    03-08-2015, 05:19 AM Go to last post
  53. Which statistical test to use to establish different behaviour between groups?

    Hi, I have got a dataset with a dichotomous groupid variable and many other independent categorical variables. My aim is to find out if subjects...

    Started by ambij‎, 03-08-2015 05:20 AM
    chi-squared, fishersexact, logistic, statistical-significance
    • Replies: 0
    • Views: 1,726
    03-08-2015, 05:20 AM Go to last post
  54. Need Help ALL STatistition

    ANy one can tell me what is a major difference between bonferoni correction and sidak correction ???

    Started by ameeq7746‎, 09-17-2013 12:31 PM
    • Replies: 2
    • Views: 1,735
    09-17-2013, 12:41 PM Go to last post
  55. Test-retest repeatability

    Hello, I have some questions regarding the use of ICC (intraclass correlation coefficient) to measure the repeatability of a 146-item...

    Started by amel21‎, 11-22-2010 08:38 AM
    • Replies: 0
    • Views: 5,191
    11-22-2010, 08:38 AM Go to last post
  56. High Correlations with Very Different Distributions..?

    I am comparing a similar calculation for the same sample via two different methods. My goal is to show that the second measure offers more rich /...

    Started by american_rob‎, 07-08-2008 02:46 PM
    • Replies: 4
    • Views: 3,608
    07-14-2008, 09:59 PM Go to last post
  57. Is Levene's transformation with ANOVA equivalent to Levene's W?

    Hello, Just a quick question that I have been pondering: I read an article (Plavcan and Cope, 2001 Evol. Anthro.) where they say that Levene's test...

    Started by amesshaps‎, 03-25-2011 09:36 PM
    anova, levene's test
    • Replies: 0
    • Views: 5,390
    03-25-2011, 09:36 PM Go to last post
  58. Comparison of Revenue Variances

    I'm a non statistical type who needs help to determine the right model to test the following scenario: I have ten stores that are all alike, in...

    Started by amg123‎, 12-20-2012 01:16 PM
    • Replies: 0
    • Views: 1,781
    12-20-2012, 01:16 PM Go to last post
  59. How to generate right censored data

    Hi all, I want to generate some data from a given distribution, let say exponential distribution. But I do not now how. Any help would be...

    Started by amin.hassanzadeh‎, 05-27-2009 04:18 PM
    • Replies: 1
    • Views: 5,167
    05-27-2009, 04:34 PM Go to last post
  60. binary forcasting

    Hello My data in a binary form a one-hour period for 90 days. 0=Not happened 1= happended I wanna to forcasting these data ,and i dont know what...

    Started by aminabdolahnejad‎, 02-16-2016 01:52 PM
    • Replies: 3
    • Views: 1,511
    02-20-2016, 03:08 PM Go to last post

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