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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: 18,746
    10-11-2014, 12:02 PM Go to last post
  1. Necessary condition analysis

    Hi, I have a research problem where I have to identify a necessary condition. I have three data series, X, Y, Z. say, Z is the dependent variable and...

    Started by fellow‎, 05-15-2012 12:09 AM
    necessary condition, sufficient condition
    • Replies: 1
    • Views: 2,036
    05-25-2016, 02:48 PM Go to last post
  2. what is the difference between latent class analysis and factor analysis?

    I read some papers and most of them used EFA/SEM, and one paper used LCA (latent class analysis). So, when do you need to use LCA but not FA? It...

    Started by fengyuwuzu‎, 06-22-2015 02:49 PM
    • Replies: 2
    • Views: 3,792
    06-22-2015, 05:04 PM Go to last post
  3. chi square test to test difference for 5x2

    My data has two groups people, VV and NV, and I want to test the difference in their occupation. The occupation were 5 groups: farm/fh, farmer/fh,...

    Started by fengyuwuzu‎, 04-27-2016 07:04 PM
    • Replies: 1
    • Views: 1,488
    04-27-2016, 07:47 PM Go to last post
  4. Regression Model

    wefwefwfweff

    Started by fhaquassho‎, 06-03-2010 06:07 PM
    • Replies: 3
    • Views: 3,912
    06-04-2010, 09:04 AM Go to last post
  5. Interpreting (negative) LDA classifier scores

    Hi, I performed an LDA in R using the lda() function. To my knowledge, this implements the LDA by Rao, 1948. From the results I derived the...

    Started by Fiete‎, 12-06-2013 05:40 PM
    • Replies: 0
    • Views: 3,334
    12-06-2013, 05:40 PM Go to last post
  6. Modified bland Altman- plotting difference aganst the criterion measure

    Hi all, I am measuring the agreement between a movement sensor that estimates VO2 in humans during exercise and criterion VO2. My supervisor advised...

    Started by FightingBull‎, 11-01-2014 08:05 AM
    agreement, altman, bland
    • Replies: 0
    • Views: 1,995
    11-01-2014, 08:05 AM Go to last post
  7. T Test

    I am trying to do a weighted mean ttest. The statistics I'm using are the vote shares for republican and democrat women candidates in primary...

    Started by fireball‎, 11-29-2014 09:29 PM
    • Replies: 1
    • Views: 1,739
    11-30-2014, 07:01 AM Go to last post
  8. Statistical analysis on redistricting and women in office; sample size, ideas??

    Okay. I have this huge paper that I've been working on for umpteen thousand years. I really need to graduate from college. The question: how does...

    Started by fireball‎, 10-20-2015 06:24 AM
    • Replies: 0
    • Views: 1,024
    10-20-2015, 06:24 AM Go to last post
  9. Should I use Bonferroni (or other similar corrections)?

    Hello! I am new in this forum, I have a question and I hope you could help me! :p Suppose that I have to measure 10 independent variables on 60...

    Started by Fischer‎, 01-08-2016 03:57 AM
    • Replies: 0
    • Views: 1,114
    01-08-2016, 03:57 AM Go to last post
  10. Question Are they misunderstanding ANOVAs here?

    Hi, Here's an extract from a paper I'm using in a systematic review: The mean GAD-7 score of the sample prior to the course was 10.98 (SD 5.17,...

    Started by fishfishfish3‎, 10-23-2014 11:56 AM
    anova, post hoc
    • Replies: 8
    • Views: 2,468
    10-24-2014, 11:22 AM Go to last post
  11. chi-square with small sample size

    I want to test whether fish prefer rocky habitat over flat habitat. The study site is 5% rocky and 95% flat. I found 6 fish in rocky habitat and 2...

    Started by fishystats‎, 05-19-2011 10:39 PM
    • Replies: 6
    • Views: 8,978
    05-20-2011, 12:24 PM Go to last post
  12. How to rank factors of a confirmatory factor analysis?

    Hey there, within my current study I would like to determine the importance of different behavioral intentions. Since behavioral intentions are...

    Started by Fk2803‎, 01-30-2017 05:52 PM
    • Replies: 0
    • Views: 1,679
    01-30-2017, 05:52 PM Go to last post
  13. 2 x 4 Factorial Design and contrasts...

    Question... I have a 2 (gender) x 4 (Drug Dose) design Gender - Male - Female Dose - 200 - 400 - 600 - 800

    Started by flanger‎, 11-30-2008 06:40 PM
    • Replies: 2
    • Views: 12,366
    11-30-2008, 11:37 PM Go to last post
  14. Ranking advertisers based on performance

    Hi, let's say you run an ad network and you want to rank your advertisers based on their performance. Now what most networks do is simply...

    Started by FlashStats‎, 07-10-2010 10:22 AM
    • Replies: 3
    • Views: 2,902
    07-13-2010, 02:23 PM Go to last post
  15. Model Suggestions?

    Hello Stat experts - I'm hoping to find some inspiration in a project I'm doing. I have some longitudinal data, 15 series of measurements ...

    Started by Flatnose‎, 05-15-2010 06:25 AM
    • Replies: 2
    • Views: 2,500
    05-20-2010, 08:07 AM Go to last post
  16. 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: 917
    04-18-2016, 07:01 AM Go to last post
  17. non parametric hierarchical regression?

    Hello, I have non parametric data and need to condcut a regression with covariates as well. I have tried to transform the data but still they are...

    Started by fliss‎, 08-30-2011 12:06 PM
    • Replies: 4
    • Views: 5,562
    08-30-2011, 03:43 PM Go to last post
  18. sample size - power calculations

    Hi, would be great if anybody could help me on this. I want to estimate the impact of an independent variable x (lets say a social program) on the...

    Started by flo2222‎, 06-05-2009 10:12 AM
    • Replies: 1
    • Views: 4,357
    06-23-2009, 12:01 AM Go to last post
  19. 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: 891
    07-25-2016, 08:35 AM Go to last post
  20. Which statistical model to choose?

    Hey guys, I have a few hypotheses in a randomized control trial that I would like to test: 1) Effect of a treatment on several outcome...

    Started by floriisco‎, 08-15-2016 12:58 PM
    hyposteses testing, hypothesis testing, interaction effect
    • Replies: 0
    • Views: 847
    08-15-2016, 12:58 PM Go to last post
  21. Tukey HSD after ANOVA

    Hi there, i have some trouble in understanding the Tukey HSD. Can you help me out please? I already did a 3x2(low vs middle vs high HRV level x...

    Started by Flowerpower‎, 09-12-2012 08:45 AM
    2 Pages
    1 2
    • Replies: 15
    • Views: 12,857
    09-13-2012, 07:13 AM Go to last post
  22. Likert/Chi-square

    Hello, I'm working on my analysis of my Graduate Capstone Project and was hoping to get some feedback to see if what I plan on doing is correct. ...

    Started by Fly_Navy‎, 11-28-2010 02:21 PM
    • Replies: 1
    • Views: 3,107
    12-15-2010, 09:34 PM Go to last post
  23. Modelling Categories and Data

    Hi, any help would be greatly appreciated. I am trying to create growth models for different tree species which correlate tree weight with height....

    Started by Forestry‎, 03-30-2011 05:51 AM
    • Replies: 0
    • Views: 1,654
    03-30-2011, 05:51 AM Go to last post
  24. attrition: comparing *surviving* sample to original

    Hi, I have a question about attrition analyses in longitudinal databases. I know that I can compare the subjects who dropped out...

    Started by foreverpostdoc‎, 11-15-2006 11:45 AM
    • Replies: 4
    • Views: 3,026
    11-19-2006, 03:33 PM Go to last post
  25. Question about proper test

    Respected experts! I have a table with different aminoacids in rows and different species in columns. Every cell contains relative amount of current...

    Started by fosgen‎, 11-12-2011 02:52 AM
    chi square, test
    • Replies: 0
    • Views: 1,572
    11-12-2011, 02:52 AM Go to last post
  26. Event study analysis significance tests

    Dear all This is my first post in the forum. I'm sorry if this question already came up, I used the search function but did not find anything. I...

    Started by fossle‎, 08-28-2015 04:14 AM
    • Replies: 0
    • Views: 1,613
    08-28-2015, 04:14 AM Go to last post
  27. Repeated Measures ANOVA Options?

    I was planning on running a repeated measures ANOVA but found these issues with my data. The assumption of sphericity was violated as assessed...

    Started by fqwc‎, 04-29-2013 06:49 AM
    • Replies: 4
    • Views: 1,489
    04-30-2013, 06:38 PM Go to last post
  28. Which ANOVA?

    I trying to decide the best statistical test to use for a survey. The RQ is related to employer acceptance of various MBA degrees. The sample is...

    Started by fqwc‎, 04-27-2013 04:23 PM
    • Replies: 1
    • Views: 964
    05-01-2013, 10:00 PM Go to last post
  29. Is this variable ordinal or categorical - which test?

    Hi, I'm not sure if this variable classifies as an ordinal or categorical DV, due to this issue I'm havign and therefore, I'm unsure which stats...

    Started by Fran2014‎, 08-29-2014 10:07 AM
    ordinal categorical test
    • Replies: 3
    • Views: 1,921
    08-29-2014, 11:22 AM Go to last post
  30. Exclamation Help needed to check statistics in thesis

    I would really need someone to check my stats work for my thesis, as I am not entirely sure about what procedures I carried out. Quick overview of...

    Started by fran93‎, 06-20-2015 10:02 AM
    anova, experiment, likert items, statistics, t-test
    • Replies: 0
    • Views: 997
    06-20-2015, 10:02 AM Go to last post
  31. 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: 3,195
    02-14-2012, 01:15 AM Go to last post
  32. probability formula

    Hello, I would like to know the formula that would allow me to do the following; Assume; 1. 200 total events occur in 100 days (ie; 2 events per...

    Started by FrankStats‎, 01-15-2016 03:11 PM
    formula, probaility
    • Replies: 5
    • Views: 1,398
    01-16-2016, 02:47 PM Go to last post
  33. Cluster analysis - using statistiXL package for excel - how to determine a cluster

    Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

    Started by frans‎, 03-29-2013 09:42 AM
    cluster analysis, statistical test
    • Replies: 2
    • Views: 2,128
    04-08-2013, 06:33 PM Go to last post
  34. Question Mixed model for two way ANOVA with SPSS

    Hi, I have to do a two way anova repeated measures (one between factor with 2 levels: control and treated, one within factor with 3 levels: time...

    Started by franziska77‎, 02-21-2015 03:08 PM
    • Replies: 0
    • Views: 952
    02-21-2015, 03:08 PM Go to last post
  35. How have you dealt with missing values?

    I'm currently conducting a large content analysis on company disclosures and have a lot of missing values. I've been looking at different ways to try...

    Started by Freaked_out‎, 06-21-2010 11:54 PM
    • Replies: 0
    • Views: 3,019
    06-21-2010, 11:54 PM Go to last post
  36. Lightbulb Obtaining Residuals in Chi Square Goodness of Fit

    Another question re: goodness of fit testing, Is the procedure for obtaining standardized residuals the same ? The PhD student who leads the...

    Started by Fred‎, 04-27-2009 11:13 AM
    • Replies: 4
    • Views: 4,572
    04-28-2009, 11:01 AM Go to last post
  37. eviews question

    Hello everybody, I need fto find evieuws somewhere on the web but i can't find it. Doesn anyone know where i can download for no charge? Thx for...

    Started by freddysurgery‎, 12-28-2010 01:20 PM
    • Replies: 3
    • Views: 5,607
    09-28-2011, 06:34 AM Go to last post
  38. Please give me feedback on my study proposal!

    Greetings, I work for a small software company, and we will be performing a statistical experiment on the effectiveness of a mobile learning...

    Started by FreddyZ‎, 03-22-2011 04:08 PM
    • Replies: 2
    • Views: 4,295
    03-23-2011, 11:20 AM Go to last post
  39. Conjoint analysis - orthogonal design

    Hi I'm setting up a conjoint experiment. It will be a traditional full profile setup with 7 factors (5 factors have 2 levels, 2 factors have 3...

    Started by Frederik‎, 12-03-2010 09:46 AM
    • Replies: 0
    • Views: 5,883
    12-03-2010, 09:46 AM Go to last post
  40. 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: 1,556
    06-15-2013, 05:13 AM Go to last post
  41. Likert scale analysis - grouped items

    Good morning, I am currently analyzing a Likert scale questionnaire (5 points) of 28 items. The items of the questionnaire are grouped into...

    Started by frederiquef‎, 08-05-2013 04:02 PM
    likert
    • Replies: 0
    • Views: 1,290
    08-05-2013, 04:02 PM Go to last post
  42. Chi-square test

    Hi all, I'm new here and am doing some research and am certainly not a statistician. Basically I have a dataset with patients who have reported drug...

    Started by fred_1‎, 06-28-2011 04:22 PM
    • Replies: 5
    • Views: 3,308
    07-13-2011, 06:58 AM Go to last post
  43. Std. residuals Chi Square test

    Hi all, I am doing some research for a uni project but I´m not particularly knowledgeable when it comes to statistics :). Basically, I have two...

    Started by fred_1‎, 12-23-2011 02:28 PM
    • Replies: 3
    • Views: 6,811
    12-24-2011, 03:10 AM Go to last post
  44. different test for normality

    Hi, Can anybody give a brief description for different non-parametric tests of distributions (like normality)? what are differences between...

    Started by Fred_a‎, 05-04-2013 08:02 PM
    kolmogorov-smirnov, lil, non parametric, shapiro-wilk test
    • Replies: 3
    • Views: 2,280
    05-05-2013, 12:58 PM Go to last post
  45. Assumption of variables for Factor Analysis

    Hi, In wikipedia page of Factor Analysis it states:Suppose we have a set of p observable random variables. Does it mean that we can use this method...

    Started by Fred_a‎, 01-13-2013 01:05 PM
    factor analysis, random variables
    • Replies: 2
    • Views: 1,390
    01-13-2013, 03:04 PM Go to last post
  46. Trend Stationarity vs. Level Stationarity

    Can s.b. explains the difference between Trend Stationarity and Level Stationarity?

    Started by Fred_a‎, 03-14-2013 10:18 PM
    stationarity, time series
    • Replies: 0
    • Views: 2,359
    03-14-2013, 10:18 PM Go to last post
  47. How to calculate ARIMA(1,0,1)

    Hello, I want to forecast the 101th data of a time series and my data is as follow 99) 0.96 100) -0.2495 101) ? and my model Coefficients: ...

    Started by Fred_a‎, 03-11-2013 03:05 PM
    arima, time-series
    • Replies: 1
    • Views: 2,792
    03-12-2013, 02:17 AM Go to last post
  48. Assumptions for an ARIMA(p, d, q) model (Box-Jenkins)

    I have a data set which is stationary but the histogram looks like a logaritmic distribution. Is this a problem? Is normality an assumption to use...

    Started by Fred_a‎, 02-18-2013 12:01 PM
    arima
    • Replies: 1
    • Views: 6,151
    02-18-2013, 12:52 PM Go to last post
  49. How to calculate conditional density

    Hi, If we have a bivariate Gaussian dist as N(m, a). m=mean and a=variance. how can we find f(x|y) in terms of m and a? Thanks

    Started by Fred_a‎, 02-06-2014 11:38 PM
    conditional, density, normal
    • Replies: 1
    • Views: 1,243
    02-07-2014, 12:35 AM Go to last post
  50. What are age effects?

    Any thoughts? I've been asked to find these with some data I've been working with.

    Started by freebird2008‎, 09-21-2008 11:09 AM
    • Replies: 2
    • Views: 2,360
    11-18-2008, 10:33 AM Go to last post
  51. Websites on designing scientific posters

    I have to do a poster presentation in a few weeks and I'm looking for some good sites that might give some advice on designing scientific posters,...

    Started by freebird2008‎, 02-23-2010 03:15 PM
    • Replies: 5
    • Views: 16,151
    05-11-2010, 02:08 AM Go to last post
  52. 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: 923
    07-20-2015, 03:09 PM Go to last post
  53. Question Paired t-test VS Anova

    I'm reading an article which is comparing the effects of three variables. But the authors used several paired t-tests to measure two variables at a...

    Started by free_radicals‎, 06-22-2012 12:52 PM
    • Replies: 2
    • Views: 3,305
    06-22-2012, 06:37 PM Go to last post
  54. Question Interpreting Tukey Test

    I did a two way ANOVA- the tukey results are in the pdf attached. I understand that there is a difference in means between lesion size 2 and lesion...

    Started by free_radicals‎, 06-24-2012 01:16 AM
    • Replies: 0
    • Views: 2,240
    06-24-2012, 01:16 AM Go to last post
  55. How to obtain standard deviation of replicate experiments?

    I have been searching in books, fora and articles but I can't seem to find a clear cut answer to the following question: I ran two experiments...

    Started by FrenzyFire‎, 01-20-2017 03:40 AM
    • Replies: 0
    • Views: 2,591
    01-20-2017, 03:40 AM Go to last post
  56. Subject responses in multiple period experiment

    Hello Everybody, In an experiment, players play a game for 30 rounds. In each round, they choose either good A or good B. In various treatments,...

    Started by Friday12‎, 09-02-2013 01:57 PM
    averaging, correlation, experiment, logit, multiple periods
    • Replies: 0
    • Views: 1,012
    09-02-2013, 01:57 PM Go to last post
  57. 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: 2,732
    10-07-2011, 06:07 PM Go to last post
  58. Analysis for MSc - multiple regression?

    Hi everyone, I hope someone wouldn't mind checking I am on the right track with the stats for my MSc project (recovery times in reptiles...

    Started by Frizzp‎, 08-08-2011 04:10 AM
    • Replies: 1
    • Views: 1,636
    08-08-2011, 11:38 AM Go to last post
  59. homogenity of variance

    I have 4 groups in a study that suffer from homogenity of variance. I use STATA. Should i trasnform the data? and how do i do that? is a log...

    Started by fromsydney‎, 09-21-2011 09:08 PM
    • Replies: 3
    • Views: 4,300
    09-22-2011, 02:58 PM Go to last post
  60. Autocorrelated measurements with autocorrelated errors, covariance term

    Dear all interested stats people, I encountered the following situation for error propagation of a time series. 1.) Given a time series...

    Started by FrostR‎, 08-11-2012 07:43 AM
    • Replies: 0
    • Views: 1,508
    08-11-2012, 07:43 AM Go to last post

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