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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: 18,616
    10-11-2014, 12:02 PM Go to last post
  1. Maximum Likelihood Estimator for a Transformed Uniorm Distribution

    Hello, I have got a transformed uniform distribution. The distribution is of the form: v= u^w Where u: uniform distributed variable w:...

    Started by consuli‎, 02-23-2015 06:21 AM
    • Replies: 0
    • Views: 925
    02-23-2015, 06:21 AM Go to last post
  2. How do i analyze the following results statistically?

    In an animal experiment study, efficacy/preference of an energy drink was compared against the individual compounds present in it. 3 groups were...

    Started by mrgb‎, 01-24-2016 10:34 PM
    statistical analysis, statistical research
    • Replies: 0
    • Views: 925
    01-24-2016, 10:34 PM Go to last post
  3. 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: 924
    11-09-2013, 09:53 PM Go to last post
  4. Research statistical analyses

    I have created my dissertation project ' The effect of eye gaze on the recognition of emotional expression in children with autistic spectrum...

    Started by Le2jbs‎, 04-16-2013 04:37 AM
    • Replies: 0
    • Views: 923
    04-16-2013, 04:37 AM Go to last post
  5. Need your help on my research study!

    Hi everyone! I am am currently having a qualitative study and have finished conducting interviews with participants. Despite qualitative in nature,...

    Started by urielbrian‎, 06-18-2015 01:40 PM
    • Replies: 0
    • Views: 923
    06-18-2015, 01:40 PM Go to last post
  6. Question about questionnaires

    I have two questionnaires I want to correlate. One questionnaire has all the questions with answers from 1 to 5, I can make a mean out of that...

    Started by Lev.alkin‎, 11-17-2015 05:27 AM
    • Replies: 2
    • Views: 923
    11-17-2015, 06:09 AM Go to last post
  7. Application of statistics for sample of a population (Urban Renewal)?

    I am bachelors student working on a report regarding Urban renewal. I am given a certain area to study. Study area include the socioeconomic aspects...

    Started by MirAli‎, 04-04-2013 02:10 AM
    • Replies: 1
    • Views: 922
    04-04-2013, 05:04 AM Go to last post
  8. clasiffy - weka

    can I use cfs setset evaluator /greedy stepwise for correlated? Which attributes seem to be most linked to the class attribute? how do understand...

    Started by raju1‎, 03-12-2017 04:33 PM
    • Replies: 0
    • Views: 922
    03-12-2017, 04:33 PM Go to last post
  9. MANOVA vs. Chi-squared

    So I am running an experiment where I am interested in the proportion of time spent doing certain behaviors under different treatments. I know...

    Started by nebulus‎, 02-24-2015 07:55 PM
    • Replies: 0
    • Views: 921
    02-24-2015, 07:55 PM Go to last post
  10. Help assessing convergence across categorical responses

    Hi folks I posted this in the SPSS section, but its actually more a question about which test to use so I think it belongs here. I'm working...

    Started by COFisher‎, 03-05-2015 11:07 AM
    • Replies: 0
    • Views: 920
    03-05-2015, 11:07 AM Go to last post
  11. How to apply syntax to specific data?

    Hi there - I need to convert some raw data into categories via a calculation which turns the raw data into angles (to establish specific groups). I...

    Started by littleone‎, 05-17-2016 09:50 AM
    • Replies: 0
    • Views: 920
    05-17-2016, 09:50 AM Go to last post
  12. Thumbs up Transformation

    Let us have variable X (it is skin conductance level) that has a great interindividual variability in "baseline" due to which all between subject...

    Started by Martin Marko‎, 11-15-2013 04:47 PM
    • Replies: 0
    • Views: 919
    11-15-2013, 04:47 PM Go to last post
  13. Interesting abstract question - Statisticians pls chk this

    I have a massive dataset (10s of millions of rows and 100s of dimensions). The dimensions are of all conceivable data types. How do I arrive at...

    Started by checkharish‎, 03-27-2015 02:06 PM
    big data, massive data sets, sampling
    • Replies: 0
    • Views: 919
    03-27-2015, 02:06 PM Go to last post
  14. Is there any effect if i change the column value in Minitab Taguchi DOE design??

    Hello all, I am trying to design Design of Experiment using Minitab statistical software using Taguchi approach. I have 3 level and four factors....

    Started by b.borad‎, 08-30-2013 11:57 AM
    minitab, taguchi
    • Replies: 0
    • Views: 915
    08-30-2013, 11:57 AM Go to last post
  15. methods for selection a subset of population to measure biomarkers

    Hi! In a quite large time-to-event clinical trial project, the population is very large (more than 1,000 people). I want to measure the subjects'...

    Started by freezingswallow‎, 07-20-2015 12:49 PM
    biomarkers, survival analysys
    • Replies: 1
    • Views: 914
    07-20-2015, 03:09 PM Go to last post
  16. Sampling from Tweets or Tweet Users

    Dear All, We would lile to do Twitter Analysis and want to read tweets for certain topic to decide wheter they are positive,negative or neutral ....

    Started by masarimk‎, 07-04-2013 03:53 AM
    • Replies: 1
    • Views: 913
    07-08-2013, 03:33 AM Go to last post
  17. Question Variance of combined clusters

    During the process of cluster analysis, when two clusters with estimated variance {s}_{1}^{2} and {s}_{2}^{2} what is the estimated variance of the...

    Started by readytolearn‎, 03-20-2012 12:44 AM
    • Replies: 0
    • Views: 912
    03-20-2012, 12:44 AM Go to last post
  18. Wink Mix of surveys

    Hello everyone, I have a very limited experience in online research and if you have 1 minute to help me, I will be grateful. Every day I build...

    Started by maria_t‎, 04-29-2013 09:12 AM
    correlation tests, probabilistic sampling, surveys
    • Replies: 1
    • Views: 912
    04-29-2013, 11:05 AM Go to last post
  19. Correlation interpretation: when to use "is related"?

    If the selling of ice cream was found correlated (0.4-0.6) to the temperature, can we conclude that ice cream selling "is related" to the...

    Started by John.Thomas‎, 03-19-2014 10:03 AM
    correlation, interpretation
    • Replies: 0
    • Views: 912
    03-19-2014, 10:03 AM Go to last post
  20. Help for Statistical Analysis for our project (using Statistical Estimation)

    Good day. I would like to ask for your help for our statistical analysis of our project. Our project is an alarm clock that is modified in a way that...

    Started by guuwey‎, 02-25-2014 06:15 AM
    • Replies: 1
    • Views: 909
    02-25-2014, 08:23 AM Go to last post
  21. How to Identify Change from Initial Values in Time Course Data

    Hello, I am currently working on my Masters Thesis and am trying to figure out a way to determine when my data is different or not from the...

    Started by csmith125‎, 11-14-2015 11:09 PM
    • Replies: 0
    • Views: 902
    11-14-2015, 11:09 PM Go to last post
  22. Any difference between online and newspaper advertisement on books selling?

    An owner of 2 bookstores B1 and B2 used 2 ways for new books advertisement. B1 advertised online, while B2 advertised in newspapers. The owner wants...

    Started by John.Thomas‎, 03-06-2014 08:03 AM
    • Replies: 0
    • Views: 901
    03-06-2014, 08:03 AM Go to last post
  23. Terminology for comparing reference questions to answers after a policy change

    Hi, Im conducting a questionnaire in order to examine the behavior of drivers of electric vehicles when providing information, such as parking...

    Started by fader‎, 05-16-2015 05:35 AM
    • Replies: 0
    • Views: 901
    05-16-2015, 05:35 AM Go to last post
  24. Policy chance analysis - time series count data

    Hi, I need some help to determine my approach. For a school project I would like to examine the effect of a policy change in the Danish...

    Started by flickerbrood‎, 04-18-2016 07:01 AM
    count data, statistical analysis, time series
    • Replies: 0
    • Views: 901
    04-18-2016, 07:01 AM Go to last post
  25. ANOVA with post hoc

    Would this study design be sufficient? I would like to study the efficacy of countermeasure versus a polygraph: Use 30 polygraph operators, 10 of...

    Started by RMann‎, 01-11-2015 07:37 AM
    • Replies: 0
    • Views: 898
    01-11-2015, 07:37 AM Go to last post
  26. Retired Statistician Selling My SAGE Statistical Reference Book Series - 25 Books !!

    Dear Fellow Statisticians, I hope this will be considered and appropriate post by the Admins. I'm a retired life-long Statistician and...

    Started by sullivan594‎, 03-16-2014 06:06 PM
    • Replies: 1
    • Views: 897
    03-16-2014, 09:20 PM Go to last post
  27. What counts as a high dimensional problem in sequential importance sampling?

    I've read a lot about how sequential importance sampling isn't useful in high dimensions, but not what is considered high. The reason for me...

    Started by JJstar‎, 03-18-2014 12:11 PM
    mcmc
    • Replies: 0
    • Views: 897
    03-18-2014, 12:11 PM Go to last post
  28. Trouble with Wilcoxon signed rank test - please help

    Firstly...I'm an absolute stats novice. I am assessing the urinary toxicity of a procedure by comparing baseline and 6 week International Prostate...

    Started by SusanKW‎, 11-29-2012 07:39 PM
    non-parametric tests, statistical analysis, wilcoxon signed-rank test
    • Replies: 0
    • Views: 895
    11-29-2012, 07:39 PM Go to last post
  29. multivar normal distribution

    Hi, I have X, Y and Z that have N distribution and I got the E(X|Y) and E(X|Z) using the bivariate rules, but for E(X|Y,Z) I don't know how to...

    Started by sabina9‎, 07-15-2013 11:09 AM
    • Replies: 1
    • Views: 893
    07-15-2013, 11:24 AM Go to last post
  30. Literature regarding Multinomial Logit Regression

    Hello, I am looking for helpful links and literature regarding the logit regression with a multinomial target variable aka multinomial GLM. ...

    Started by consuli‎, 02-12-2015 08:06 AM
    • Replies: 0
    • Views: 891
    02-12-2015, 08:06 AM Go to last post
  31. Statistical tests for the analysis of acoustic parameters of one speaker

    Hello! I would like to address the question regarding the statistics. I am analyzing the relation between the narrow focus and fundamental...

    Started by draganvarajic‎, 08-26-2015 05:38 AM
    • Replies: 0
    • Views: 890
    08-26-2015, 05:38 AM Go to last post
  32. How to apply Chi Squared test according to this Simulation?

    Hi there, I have been wondering about some points of Chi squared test. I would like to introduce the following scenario to better clarify my...

    Started by pelluzi‎, 04-19-2016 04:24 PM
    anova, chi sq test, chi square test, chi squared
    • Replies: 0
    • Views: 890
    04-19-2016, 04:24 PM Go to last post
  33. Selecting of statistical test?

    I have a study whereby I asked two groups of participants (Clients (N=76) and Professionals (N=62) what qualities would make a treatment interaction...

    Started by sf27‎, 04-01-2017 03:20 AM
    chi square, statistic test, t-test
    • Replies: 0
    • Views: 890
    04-01-2017, 03:20 AM Go to last post
  34. 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: 889
    12-04-2012, 04:29 PM Go to last post
  35. Using CAPM as an underlying model to find anomalies in data

    I have data on returns for a certain type of stock (we shall call it class A) for several markets, market return data and the risk free rates over...

    Started by ineedhelpineedhelp‎, 05-01-2014 12:36 PM
    • Replies: 0
    • Views: 889
    05-01-2014, 12:36 PM Go to last post
  36. Quality Control with statistics

    I'm working with a dataset consisting of just over 2 years of 5 minute data. For roughly 7 months of this time my instrument was not functioning...

    Started by Dan1234‎, 11-02-2012 11:14 AM
    • Replies: 0
    • Views: 884
    11-02-2012, 11:14 AM Go to last post
  37. How to compare whether younger patients have better therapeutic results ?

    Hi, I've just finished a research on 30 patients. Age range was 26 to 80. I've tested everyone of them before and after the treatment. Results are...

    Started by nicck‎, 12-19-2015 09:16 AM
    • Replies: 1
    • Views: 884
    12-19-2015, 10:07 AM Go to last post
  38. Calculate CI for Var of sum of normally dist variables?

    Hi guys, I'm trying to figure out how to calculate a confidence interval for a variable that is the sum of normally distributed variables. ...

    Started by CJ Rockball‎, 02-02-2014 10:39 AM
    • Replies: 0
    • Views: 881
    02-02-2014, 10:39 AM Go to last post
  39. Suggestions for Statistical Methods for Health Research

    I am currently planning a research project looking at a scoring system for patients (using demographics, social circumstances) to determine whether...

    Started by dornsapothecary‎, 01-18-2014 11:59 AM
    anova, health research, logisitic regression, statistical design, statistical help
    • Replies: 0
    • Views: 880
    01-18-2014, 11:59 AM Go to last post
  40. Unsure of which analysis I should use. Hoping for some help!

    You will have to forgive me, Im moderately inexperienced in this, and have been having one of those weeks where I keep questioning myself. Im...

    Started by Eon‎, 10-07-2013 10:18 PM
    • Replies: 0
    • Views: 878
    10-07-2013, 10:18 PM Go to last post
  41. Enrichment / over-representation of pairs, triplets, quadruples, etc.

    Due to a lack of interest from users for over a month I would like to delete this thread.

    Started by Adam Przedniczek‎, 12-19-2015 04:01 PM
    enrichment, over-representation
    • Replies: 0
    • Views: 876
    12-19-2015, 04:01 PM Go to last post
  42. split-split plot with continuous subplot variable

    Hello I am trying to analyze data from a split-split-plot design. The sub-plot is a continuous factor and since we suspect a non-linear...

    Started by szm‎, 08-23-2016 05:54 AM
    ancova, random effects, sas, split-plot
    • Replies: 1
    • Views: 875
    08-26-2016, 06:44 AM Go to last post
  43. within-subject factor

    RQ: Is there an effect of the number of PEmax maneuvers on EMG amplitude? PEmax(within-subject factor: base, fatigue, rest), EMG amplitude...

    Started by eunkum1‎, 04-17-2014 10:23 AM
    • Replies: 0
    • Views: 871
    04-17-2014, 10:23 AM Go to last post
  44. How to analyze change in performance

    Greetings, I have a task that two groups of participants completed at Time 1 and Time 2. I was planning to conduct a repeated measures ANOVA,...

    Started by Luxor‎, 04-28-2017 09:17 AM
    • Replies: 2
    • Views: 871
    04-28-2017, 12:11 PM Go to last post
  45. Does autocorrelation in data affect (simple) correlation measures?

    Hello everyone, I have a question concerning autocorrelation in data affecting correlation coefficients. I have a time series of stock returns...

    Started by samf‎, 06-04-2015 10:35 AM
    • Replies: 0
    • Views: 870
    06-04-2015, 10:35 AM Go to last post
  46. Studies Quality Assesment: interpreted univariate analysis, adjusted for confounding?

    Hello, I am conducting a systematic review on mostly cohort studies. One part of my quality assessment is of course; if the observational study...

    Started by FlorenziH‎, 07-25-2016 08:35 AM
    systematic review
    • Replies: 0
    • Views: 869
    07-25-2016, 08:35 AM Go to last post
  47. 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: 869
    08-16-2016, 08:22 PM Go to last post
  48. Within Subjects Analyses Advice

    Hi all, New user & first time poster. I'm finalizing my dissertation and am searching for similar examples as my project or some way to justify...

    Started by psychphd‎, 06-01-2017 07:12 PM
    repeated measures, repeated measures anova, within subjects
    • Replies: 0
    • Views: 868
    06-01-2017, 07:12 PM Go to last post
  49. compare a non ranked list to a ranked list

    Hi, I need to compare a small list of genes (genes of interests) to a big ranked list of genes (9000) where the 1st one is shown to have an effect...

    Started by noirobscure‎, 02-18-2014 03:03 PM
    • Replies: 2
    • Views: 867
    02-24-2014, 11:09 AM Go to last post
  50. Computing ICCs

    Hi everyone, Have run into a problem that has me absolutely stumped and would appreciate some assistance. I'm attempting to compute the ICC from...

    Started by jnian‎, 06-29-2015 03:36 PM
    • Replies: 0
    • Views: 865
    06-29-2015, 03:36 PM Go to last post
  51. Research Project Pseudoreplication Problem

    Hello, I posted a few weeks ago but some new problems have come up and I could really use some advice! I am joining in on a research project in...

    Started by nikhil‎, 06-02-2015 06:24 PM
    • Replies: 1
    • Views: 861
    06-03-2015, 03:12 AM Go to last post
  52. Best Stat Question Ever?

    Got this off Twitter (@galka_max) and found it interesting: If you choose an answer to this question at random, what is the chance you will get it...

    Started by The Game‎, 06-20-2017 09:42 PM
    • Replies: 8
    • Views: 859
    09-06-2017, 01:14 AM Go to last post
  53. Chi-square instead of Multiple Regression Analysis

    Can someone help me? How can I explain that I used Chi-square test of association instead of Multiple Linear Regression Analysis because I had...

    Started by choco21lit‎, 05-21-2016 11:45 AM
    • Replies: 0
    • Views: 858
    05-21-2016, 11:45 AM Go to last post
  54. How can I analyse this data is the best way possible?

    How can I investigate the theory that a relationship between two variables, X and Y is 'Y in proportion to X^3/4' within a population where I can...

    Started by Amritanar‎, 04-17-2016 04:46 AM
    • Replies: 0
    • Views: 857
    04-17-2016, 04:46 AM Go to last post
  55. Identifying the right way to establish correlations between different topics

    I have multiple topics each with hundreds of questions and different students submitting responses to these questions. What is the best way to...

    Started by sasank‎, 07-02-2016 03:56 AM
    • Replies: 0
    • Views: 854
    07-02-2016, 03:56 AM Go to last post
  56. Question Identifying relevant predictors and interactions

    I have a data set comprising of 12,000 observations and 1,100 potential predictors (continuous and nominal) for a binary outcome/target variable. ...

    Started by Edwin_C‎, 11-23-2015 05:57 AM
    feature selection, statistical analysis, statistical research
    • Replies: 0
    • Views: 850
    11-23-2015, 05:57 AM Go to last post
  57. Dealing with censored dates as regressors

    I'm estimating a linear model, with one of the independent variables being a date of appearance. I consider the date to be a minimum date of...

    Started by nbi‎, 03-30-2017 07:30 AM
    censoring, regression, time-series
    • Replies: 2
    • Views: 849
    04-13-2017, 11:31 AM Go to last post
  58. Unbalanced designs in PERMANOVA and Resampling Methods

    Dear all, I am a new member here, working mainly in Ecology. I hope this is the right section to ask my question. I am dealing with unbalanced...

    Started by Yser‎, 05-11-2017 07:16 AM
    bootstrap, permanova, unequal sample size
    • Replies: 0
    • Views: 845
    05-11-2017, 07:16 AM Go to last post
  59. Help Please - Multi-Dimensional Interpolation Analysis

    Hi all, I am currently working on a problem that involves a lot of statistics and probability. Unfortunately I have limit expertise in both these...

    Started by kevinbowe2000‎, 12-06-2013 12:47 PM
    • Replies: 0
    • Views: 841
    12-06-2013, 12:47 PM Go to last post
  60. Random Sampling - Missing Something Easy and I know it

    Hello everyone, I was asked to look over some data that came across my desk and I was stumped as to why it came out the way that it did. So the...

    Started by txsnowman‎, 07-24-2017 04:25 PM
    • Replies: 12
    • Views: 840
    07-25-2017, 11:21 AM Go to last post

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