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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: 18,662
    10-11-2014, 12:02 PM Go to last post
  1. Find Total Utility Consumed

    Hi, I have snapshots of electricity cosumption data. For eg. at 4:00 am, the consumption is 3000 kw at 4:15 am, the consumption is 15205 kw at...

    Started by suhana‎, 09-30-2012 11:01 PM
    energy consumed
    • Replies: 2
    • Views: 1,113
    09-30-2012, 11:23 PM Go to last post
  2. Finding an extended Fmax table for an experiment with 25 treatments

    Hi everyone. Many of my experiments have a lot of treatments (>25) and I'm having a problem when it comes to calculating a critical Fmax value,...

    Started by Tara Duggan‎, 08-29-2012 03:20 AM
    • Replies: 0
    • Views: 1,270
    08-29-2012, 03:20 AM Go to last post
  3. Finding cyclic function from points with more than 2 indep. variables

    Hello, I am doing my master thesis in Electrical engineering about the impact of the humidity and temperature on power consumption I have a...

    Started by aahh1982‎, 12-11-2010 08:45 PM
    • Replies: 0
    • Views: 3,249
    12-11-2010, 08:45 PM Go to last post
  4. finding data trends

    I have a dataset that includes four replicates of 7 different concentrations of pesticides applied to a plant. After exposure the number of offshoots...

    Started by studentmile‎, 11-02-2008 01:20 PM
    • Replies: 2
    • Views: 3,570
    11-16-2008, 03:31 AM Go to last post
  5. Finding degree of difference

    I am given two sets of data collected by two different people. The data in includes the variables area, production and productivity of coconut. Now,...

    Started by geek‎, 07-09-2015 02:16 AM
    degree of difference, statistical analysis
    • Replies: 2
    • Views: 1,465
    07-10-2015, 01:54 AM Go to last post
  6. Finding my control group PSM, Matching or regression model and correct for confounder

    Hey there, First off I'm hoping I'm posting this in the right place. I'm doing research where there is a patient group of n=9 that underwent...

    Started by Longo‎, 03-01-2017 01:43 PM
    confounders, control group, help needed, matching, regression model
    • Replies: 3
    • Views: 1,602
    03-02-2017, 09:41 PM Go to last post
  7. finding quantiles

    how do you find the quantile of a single number in a distribution in R? input: number output: percentage THank you!

    Started by sleck‎, 07-31-2008 10:42 AM
    • Replies: 5
    • Views: 7,469
    07-31-2008, 04:08 PM Go to last post
  8. Finding relationship between 2 curves over time

    Hi guys, Awesome forum! My question does not look too complicated, but around my research centre here nobody knows what to do with my problem......

    Started by ehestigoni‎, 03-08-2009 05:49 PM
    • Replies: 1
    • Views: 3,752
    03-11-2009, 05:40 PM Go to last post
  9. Finding Relationships with Crosstab Data

    first off, I am still a newbie when it comes to modeling, so please bare with me if the answer is completely obvious! I have been given some...

    Started by ccooper‎, 06-25-2013 02:04 PM
    • Replies: 4
    • Views: 2,079
    06-25-2013, 04:52 PM Go to last post
  10. Finding SD given mean and n

    I am looking at data from State Assessment results and would like to compare means for schools. The problem is that the data that is given does not...

    Started by trinker‎, 04-04-2011 10:59 PM
    • Replies: 2
    • Views: 4,084
    04-04-2011, 11:53 PM Go to last post
  11. 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
  12. Finding the cov matrix of MLE using Hessian

    To properly calculate the covariance of an MLE you would need to find the inverse of the Fisher information matrix, evaluated at the MLE. And this...

    Started by paralleluniverse‎, 09-10-2010 11:02 AM
    • Replies: 1
    • Views: 7,517
    09-10-2010, 03:20 PM Go to last post
  13. 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: 20,800
    11-12-2011, 03:41 AM Go to last post
  14. Question finding UMVUE

    let X_1,X_2,.....X_n be a random sample from f(x;\theta)=\frac{e^{-|x|/\theta}}{2\theta}, -\infty<x<\infty Find UMVUE of \theta^r help needed...

    Started by Sambit‎, 11-13-2010 07:45 AM
    • Replies: 3
    • Views: 6,933
    11-13-2010, 01:44 PM Go to last post
  15. Fisher information matrix

    Hello everybody, I read here that the Fisher information matrix was the inverse of covariance matrix. How can I show that ? My definition of...

    Started by Pingouinche‎, 08-20-2009 09:01 AM
    • Replies: 0
    • Views: 4,224
    08-20-2009, 09:01 AM Go to last post
  16. Fisher LDA

    Hi, How do I incorporate knowledge of prior class probabilities p_i into Fisher LDA? I think Fisher LDA assumes p_i = 1/c always, with c=# of...

    Started by omrit‎, 02-22-2011 08:54 AM
    • Replies: 2
    • Views: 4,110
    02-22-2011, 11:39 AM Go to last post
  17. Fisher's exact test

    I have always learned that if you have a contingency table that violates the chi square assumption of more than 20% of cells having expected count...

    Started by shanehall.m‎, 08-31-2011 09:46 AM
    categorical data, chi square, exact test, post hoc test
    • Replies: 3
    • Views: 8,877
    09-01-2011, 02:02 PM Go to last post
  18. Smile Fisher's Exact test and subjects with multiple observations?

    Hi Everyone, I was wondering if I could please have some advice on how to deal with data that have multiple observations for some of the subjects...

    Started by NenaB‎, 01-19-2016 02:45 PM
    difference in proportions, fisher's exact, proportions, related observations
    • Replies: 4
    • Views: 1,287
    01-20-2016, 06:31 PM Go to last post
  19. Fisher's Exact test significance, APA results phrasing

    My original post questions were answered offline. Thanks for allowing me to post!

    Started by Melanie‎, 07-10-2012 10:42 PM
    • Replies: 0
    • Views: 2,281
    07-10-2012, 10:42 PM Go to last post
  20. Fisher's exact test, Hypergeometric distribution

    Hi, I need some help with Fisher's exact test and the hypergeometric distribution My data consists of: 500 mutations - that I want to score as...

    Started by AnnaS‎, 04-24-2012 08:19 AM
    fisher's exact test, hypergeometric
    • Replies: 0
    • Views: 3,418
    04-24-2012, 08:19 AM Go to last post
  21. Fisher's Scoring Iterations ?

    Hi, what does Fisher's Scoring Iteration mean?? Fisher's exact calculation gives a score of 4 but what does this number mean exactly?? Thanks, S

    Started by palmer86‎, 04-15-2013 03:15 PM
    • Replies: 0
    • Views: 4,275
    04-15-2013, 03:15 PM Go to last post
  22. Fisher's z transformation in path analysis

    Hi guys. I am a psychology honours student doing my thesis by producing a path analysis that I ran with two different samples - one with a younger...

    Started by AndrewTheSeer‎, 09-21-2009 09:14 PM
    • Replies: 0
    • Views: 3,350
    09-21-2009, 09:14 PM Go to last post
  23. Fishy problem- which stat is appropriate? t-test or mann whitney

    Hello kind stats people, I'm in a bind! In my PhD I'm studying fertilisation success of 2 species of fish when they mate with each other. So how...

    Started by SianDiamond‎, 07-13-2011 09:18 AM
    mann-whitney, proportions, t test, which test
    • Replies: 0
    • Views: 2,148
    07-13-2011, 09:18 AM Go to last post
  24. Fitindices to determine optimal clustersolution in clusteranalysis

    Hello, My question is about the selection of the optimal cluster solution. I have used SPSS version 21.0 to perform a cluster analysis in which...

    Started by MaaikeSmits‎, 04-29-2015 04:53 AM
    • Replies: 0
    • Views: 693
    04-29-2015, 04:53 AM Go to last post
  25. Fitting Archimedean copula

    hello, I am attempting to fit an archimedean copula in R, clayton specifically. I attempt to use the fit.AC function. I get the following...

    Started by vandypimp‎, 11-22-2010 10:45 PM
    • Replies: 2
    • Views: 5,148
    12-23-2010, 08:31 PM Go to last post
  26. Fixed and random effect models?

    I've come across these model names in the literature and don't have that much background info on the topic. I was reading some definitions I found by...

    Started by Jka‎, 02-20-2013 03:31 AM
    • Replies: 1
    • Views: 1,458
    02-20-2013, 06:34 AM Go to last post
  27. Fixed and Random Effects in Mixed Modeling

    Thank ahead of time for any help. I am analyzing time series data. Originally I was running Repeated Measures ANOVA and entering between subjects...

    Started by John.kostek‎, 01-23-2013 03:25 PM
    fixed effects, mixed modeling, random effects
    • Replies: 2
    • Views: 1,929
    02-01-2013, 07:40 AM Go to last post
  28. fixed or random factor for ANOVA

    I've had a discussion with a colleague over the proper way to analyse results of an experiment. We tested the performance of 6 subjects in a...

    Started by sam81‎, 09-19-2011 07:06 AM
    anova, fixed effects, random effects
    • Replies: 1
    • Views: 3,035
    09-19-2011, 08:12 PM Go to last post
  29. Fixed/Random Effects model v. OLS Regression with dummies

    Hello everyone! :wave: I have three consecutive waves of panel data with which I will be estimating incomes based on the Mincer equation. I have...

    Started by Kabouterke‎, 05-13-2014 06:01 PM
    • Replies: 2
    • Views: 1,809
    05-13-2014, 10:49 PM Go to last post
  30. Fleiss Kappa - an interesting blog and a question for your help

    Hi there, I am new to this forum. Hope you had a great Thanksgiving (if you are from Canada)! In my research, I have asked three evaluators to...

    Started by lucky_book‎, 10-11-2011 03:24 PM
    • Replies: 0
    • Views: 2,575
    10-11-2011, 03:24 PM Go to last post
  31. Football (Soccer) Betting Model Inference

    British Football (Soccer) Betting Model Inference Hi,Guys! I am not a statistician, so please forgive me if I miss some points (which I surely...

    Started by Valen‎, 01-06-2011 11:02 AM
    • Replies: 2
    • Views: 5,128
    01-06-2011, 01:12 PM Go to last post
  32. Football(Soccer) Betting Model Inference

    Please sorry for reposting, I had a problem with my pictures in post, they were stored on my computer. I think it's better to attach them to the...

    Started by Valen‎, 01-07-2011 03:12 AM
    • Replies: 0
    • Views: 3,511
    01-07-2011, 03:12 AM Go to last post
  33. Forest plot total calculator for OR and RR

    Hi, Im doing a meta-analysis with studies of both case control and cohort and Im trying to put them all together in a forest plot. Hence, I find...

    Started by mythstera‎, 04-09-2015 10:29 PM
    • Replies: 0
    • Views: 1,404
    04-09-2015, 10:29 PM Go to last post
  34. Forest Plots - Please Help!!!!!

    How can I create forest plots? I want to calculate the odds ratio effectiveness of two treatments.. Can I create forest plots using SPSS (PASW)?...

    Started by Astero‎, 06-22-2011 12:44 PM
    forest plots, statistics, statistics help
    • Replies: 3
    • Views: 8,774
    06-22-2011, 05:55 PM Go to last post
  35. Formula of Return

    I am new at Business Research, i have a problem that i am not sure about the formula of calculating return. Can you please help me confirm that...

    Started by SFranck‎, 04-05-2011 03:44 PM
    formula of return
    • Replies: 1
    • Views: 4,497
    04-05-2011, 07:38 PM Go to last post
  36. Four Factor Design ~ Homoscedasticity Problem

    Hello! For school, I have decided to do a project on airline reliability; specifically, looking at on-time departures. I decided to use a four...

    Started by Jordan.Davis‎, 01-12-2014 08:20 PM
    anova, factor design, homoscedasticity, levene, transformation
    • Replies: 0
    • Views: 1,453
    01-12-2014, 08:20 PM Go to last post
  37. 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: 1,474
    11-01-2012, 06:17 PM Go to last post
  38. Question Frequency Distribution

    Hi all :wave:. I have a question, that is very important for me! :( It is written in book "basic statistics for business and economics" for...

    Started by masumeh‎, 09-27-2013 07:01 AM
    • Replies: 2
    • Views: 1,485
    09-27-2013, 07:32 AM Go to last post
  39. 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: 3,089
    11-12-2011, 03:02 PM Go to last post
  40. 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
  41. From OLS to Box Cox to ?

    Hello, I have just found this website - thank you so much for all the contributions made here. I hope you can provide me with some quick help. ...

    Started by andony‎, 08-29-2008 01:25 PM
    • Replies: 4
    • Views: 5,951
    08-31-2008, 02:58 PM Go to last post
  42. From Pearson correlation to LMM Contribution

    Hi, I have two variables X1 and X2 which are poorly correlated (Pearson; r=0.1). Since we think the relation between X1 and X2 varies daily, I...

    Started by Meytar‎, 08-15-2017 12:20 PM
    • Replies: 2
    • Views: 216
    08-17-2017, 02:58 AM Go to last post
  43. Full factorial design

    I have the followinf situation for a full factorial design. Estimated Effects and Coefficients ________t____ p-value...

    Started by mp83‎, 01-19-2010 08:14 AM
    • Replies: 0
    • Views: 3,324
    01-19-2010, 08:14 AM Go to last post
  44. further causal analysis

    Hi All, So I did this analysis on a dataset by exploiting partial correlation matrix. I can see how the variables are related to each other and to...

    Started by viktus‎, 07-20-2012 06:17 AM
    • Replies: 6
    • Views: 1,801
    09-06-2012, 03:56 PM Go to last post
  45. Fuzzy RDD in Stata with two cutoff points

    Dear all, i am running a Fuzzy Regression Discontinuity Design using 2SLS in Stata. My question is basically if i specified the model (and most...

    Started by HG28‎, 08-20-2017 03:02 PM
    • Replies: 0
    • Views: 287
    08-20-2017, 03:02 PM Go to last post
  46. G*Power 3.12 Help

    Hi all, I'm brand new to the forum and relatively new to the world of research. I'm an undergraduate preparing for graduate studies. If this is...

    Started by Ryman1510‎, 01-06-2011 11:09 AM
    • Replies: 0
    • Views: 2,991
    01-06-2011, 11:09 AM Go to last post
  47. Question Gage R&R results to usable data

    This is for my thesis & i'm stumped. Please help. A Gage R&R was done comparing two inspection tools to each other. These tools measure the section...

    Started by erica56458‎, 09-12-2016 03:58 AM
    gage r&r, precision, probability
    • Replies: 1
    • Views: 1,241
    09-12-2016, 04:21 AM Go to last post
  48. Gamma distribution

    Hi, If I have three independent variables that all follow the gamma distribution, what distribution will then sum of these variables follow? ...

    Started by samot79‎, 06-28-2016 02:56 AM
    gamma distribution
    • Replies: 0
    • Views: 941
    06-28-2016, 02:56 AM Go to last post
  49. Gamma Poisson Mixture with finite Gamma

    Dear all I am working with a Gamma-Poisson mixture distribution where (and this is not usual) the support of the Gamma distribution (in fact, I am...

    Started by ARDE‎, 11-30-2012 06:49 AM
    gamma, mixture, poisson
    • Replies: 0
    • Views: 1,657
    11-30-2012, 06:49 AM Go to last post
  50. Gamma vs. Tau's b

    Hi everyone I am studying political science, and we have during our classes of statistical research learned to use gamma for ordinal variables....

    Started by Frederik Gørtz‎, 06-12-2013 12:19 PM
    gamma, kendall, tau
    • Replies: 2
    • Views: 1,536
    06-15-2013, 05:13 AM Go to last post
  51. GAMs: test of simple effects following a significant interaction

    Hello, I am a novice in Generalized Additive Models (GAMs) and I would need some advice on these models. From capture data, I would like to...

    Started by MarineRegis‎, 11-22-2016 01:44 PM
    gam model, interaction term
    • Replies: 0
    • Views: 2,893
    11-22-2016, 01:44 PM Go to last post
  52. GARCH fitting to binary data / latent data

    Dear all I am trying to fit a simple ARCH(1)/GARCH(1,1) model to a set of binary data, i.e. I assume a latent GARCH process that is only observed...

    Started by ARDE‎, 05-30-2012 03:19 AM
    • Replies: 0
    • Views: 2,012
    05-30-2012, 03:19 AM Go to last post
  53. Garch fitting when some of the data might be inaccurate

    Can anyone guide me to any newbie-ish literature on how to fit garch parameters (for example in Garch 1,1) to data where a small percentage of...

    Started by paulepstein‎, 01-11-2010 10:53 AM
    • Replies: 0
    • Views: 2,627
    01-11-2010, 10:53 AM Go to last post
  54. Gaussian Processes - Wiener process - The drunk particle

    Hello, I recently read about Gaussian Processes (http://en.wikipedia.org/wiki/Gaussian_process) for non linear regression. I am not an expert but...

    Started by havyhidalgo‎, 03-04-2013 12:21 PM
    gaussian distribution, gaussian processes, regression model, wiener process
    • Replies: 0
    • Views: 2,228
    03-04-2013, 12:21 PM Go to last post
  55. gee longitudinal

    Hi there, I goin crazy with GEE and longitudianl data. I've studied the algorithm in many books and I am sure that I understand it and try to...

    Started by leo nidas‎, 05-23-2010 05:01 PM
    • Replies: 0
    • Views: 2,034
    05-23-2010, 05:01 PM Go to last post
  56. gender differences

    Hi, I have a daily information for years about a dependent variable that measures the degree of risk taken by men and women in their decision...

    Started by 12345678‎, 04-10-2009 01:08 AM
    • Replies: 6
    • Views: 5,003
    05-09-2009, 07:40 PM Go to last post
  57. General inverse variance method

    Hi I hope I've posted this in the right place. I'm converting standardised mean differences to log OR for a meta-analysis. Just wanting to know...

    Started by glassman365‎, 01-25-2016 07:14 AM
    meta analysis, odds ratio, standard error
    • Replies: 1
    • Views: 1,310
    01-25-2016, 08:55 AM Go to last post
  58. General lasso question

    Hi all, I'm using logistic regression with a lasso-like constraint on the parameters. I have noticed that very often the sum of the absolute...

    Started by olac‎, 06-13-2007 09:07 AM
    • Replies: 0
    • Views: 2,449
    06-13-2007, 09:07 AM Go to last post
  59. Post General method for data analysis

    Dear community, maybe you can help me. I have a lots of data like this format: Person/points/work/power/sex Person1/75/10/120/m...

    Started by Dotana‎, 11-11-2013 08:52 AM
    • Replies: 3
    • Views: 1,329
    11-14-2013, 10:32 AM Go to last post
  60. General Term for Models with Dependend and Independend Variables

    Hi! What is the general term for models with dependend and independend variables, like regressions, generalized linear models, decision trees, and...

    Started by consuli‎, 01-24-2015 09:42 AM
    • Replies: 3
    • Views: 2,432
    01-26-2015, 06:44 AM Go to last post

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