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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: 19,443
    10-11-2014, 12:02 PM Go to last post
  1. small sample size

    hi everybody. i need your help urgently... in my resource i need to measure a distribution for a Certain metal property (microscopic property)....

    Started by adam2649‎, 05-19-2015 01:02 AM
    • Replies: 0
    • Views: 763
    05-19-2015, 01:02 AM Go to last post
  2. geometric argument for constraints on r_xz given r_xy and r_yz

    Today a labmate asked the following question: if we have three random variables x, y, z, and we know the correlations r_{xy} and r_{yz}, what...

    Started by Jake‎, 09-17-2013 01:17 AM
    • Replies: 5
    • Views: 4,212
    05-18-2015, 04:16 PM Go to last post
  3. PCA use

    Hi everybody, Is PCA used to see whether a set of designed items to measure something actually do it? It's a big panic for me. Thank you very much

    Started by nouses‎, 05-18-2015 09:21 AM
    • Replies: 2
    • Views: 1,308
    05-18-2015, 12:27 PM Go to last post
  4. Research Problem (Hypothesis and Data Analysis)

    I am conducting a research on the influence of school administrators on teachers’ retention. I have collected data on this with likert-scaled (5...

    Started by Toninet‎, 05-16-2015 07:10 AM
    data analysis, hypothesis, research problem
    • Replies: 0
    • Views: 1,210
    05-16-2015, 07:10 AM Go to last post
  5. Terminology for comparing reference questions to answers after a policy change

    Hi, I´m 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: 1,006
    05-16-2015, 05:35 AM Go to last post
  6. Three group intervention, confused about study design and analysis

    Please refer to updated post.

    Started by professorzoom‎, 05-14-2015 05:27 PM
    • Replies: 0
    • Views: 1,316
    05-14-2015, 05:27 PM Go to last post
  7. question regarding Non Parametric Test

    Hi all, I want to test the relation between dependent varaiable and other independent variables, my sample is Companies registered in the...

    Started by kormbo2002‎, 05-12-2015 02:11 PM
    choose test
    • Replies: 1
    • Views: 1,135
    05-14-2015, 02:22 AM Go to last post
  8. Raw Data vs Frequency Distribution

    Hi, I am new here, please discuss this given below. “Why an average computed from a frequency distribution is not exactly the same as...

    Started by Anum‎, 05-09-2015 07:44 AM
    • Replies: 6
    • Views: 6,097
    05-11-2015, 07:48 AM Go to last post
  9. Question Regarding Research Design

    If I have a dataset with 100 unspecified cases and I know from a previous chart review that the likelihood is that 10% of these are indeed cases how...

    Started by cmcm855‎, 05-10-2015 07:28 PM
    • Replies: 2
    • Views: 1,385
    05-10-2015, 10:47 PM Go to last post
  10. Composite Hypothesis Testing Problem

    Hello guys, So I have this problem I am trying to solve and its

    Started by glorean‎, 05-10-2015 04:48 PM
    inference, statistics
    • Replies: 0
    • Views: 1,007
    05-10-2015, 04:48 PM Go to last post
  11. How to obtain individual factor scores after PCAs on multple imputed datsets???

    Hello, I really hope, someone here can help me, I've searched the internet for hours and could not get any clue on how to solve my problem. I...

    Started by marbar‎, 12-29-2011 08:24 AM
    • Replies: 14
    • Views: 6,777
    05-09-2015, 07:04 AM Go to last post
  12. huge differences in R2 between OLS and ordered logit regression model

    I was wondering why I get huge differences in R2 when running a ordered logit model and a OLS model. I use the same DV and IVs for both models. The...

    Started by andik‎, 05-06-2015 09:53 PM
    • Replies: 2
    • Views: 1,405
    05-07-2015, 10:08 AM Go to last post
  13. R-squared in MANOVA

    I performed a (k-means) clusteranalysis and want to use the % of explained variance as a measure for the fit of the 2-, 3-, 4- and 5 clustersolutions...

    Started by MaaikeSmits‎, 05-06-2015 04:23 AM
    • Replies: 0
    • Views: 2,350
    05-06-2015, 04:23 AM Go to last post
  14. Exclamation Combining two samples to then do Cluster Analysis/multivariate analysis

    I was wondering if someone can help. For a university assignment I have been asked to propose a marketing research method & survey etc for a...

    Started by student123‎, 05-03-2015 04:25 PM
    analysis, cluster, combined sampling, quota sampling, stratified sampling
    • Replies: 0
    • Views: 1,162
    05-03-2015, 04:25 PM Go to last post
  15. Statistical advice

    Hi Gurus, I'm very new to the forum, I need an advice and solution to my problem. we are doing a test USP Method and our in house method. we want...

    Started by thong127‎, 05-01-2015 09:58 AM
    • Replies: 0
    • Views: 1,225
    05-01-2015, 09:58 AM Go to last post
  16. Question Comparison of time series nested in Repeated Measures Design

    Post deleted cause it garnered no responses on this forum....

    Started by karan85‎, 04-30-2015 11:30 AM
    • Replies: 0
    • Views: 1,748
    04-30-2015, 11:30 AM Go to last post
  17. 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: 746
    04-29-2015, 04:53 AM Go to last post
  18. Feedback on bootstrapping effect size and t-values

    I am trying to learn to bootstrap per conversation here the other day. I know there are packages to bootstrap but wanted to process more...

    Started by trinker‎, 04-28-2015 01:07 PM
    3 Pages
    1 2 3
    • Replies: 31
    • Views: 5,141
    04-28-2015, 09:25 PM Go to last post
  19. Blocked ANOVA: unequal amount of data for the different blocks?

    Hi guys, So I'm conducting an experiment where I'm using a blocked ANOVA and have a few questions about my data set. I'm looking at the abundance...

    Started by srpang89‎, 04-28-2015 08:15 PM
    • Replies: 0
    • Views: 1,352
    04-28-2015, 08:15 PM Go to last post
  20. Converting Correlation to Effect Size

    Has anyone had experience of converting various indicators of effect size (students t, odds ratio, correlation etc.) to Cohen's d effect size? ...

    Started by JohnB‎, 04-27-2015 06:25 AM
    • Replies: 2
    • Views: 1,624
    04-28-2015, 04:43 AM Go to last post
  21. Kendall's Tau

    As part of my analysis report I did a chi square test. However, since my tables are too large normal post hoc procedure could not be followed....

    Started by Xbar‎, 04-20-2015 10:31 AM
    • Replies: 2
    • Views: 1,622
    04-22-2015, 03:48 PM Go to last post
  22. Thumbs up Analysis of counts data from consumer test

    Hi everyone, First of all I'm new to this forum so my apologies in advance for the mistakes I could do by posting here. My issue is the...

    Started by victormoulinier‎, 04-22-2015 09:43 AM
    best choosing, consumer test, count analysis
    • Replies: 2
    • Views: 1,402
    04-22-2015, 10:33 AM Go to last post
  23. Visual display of one-tailed tests

    I am trying to show the results of an analysis with one tailed tests in a figure. The model uses logistic regression, with a interval variable as...

    Started by psNC‎, 04-21-2015 10:01 AM
    • Replies: 2
    • Views: 1,065
    04-21-2015, 10:28 AM Go to last post
  24. Calculating range

    Dear all This is my first question in this forum. I have 100 over medical data points which was measured in different patients practically....

    Started by kmgraju‎, 04-20-2015 08:52 AM
    • Replies: 2
    • Views: 1,424
    04-21-2015, 09:34 AM Go to last post
  25. problem with calculating total score on SPSS

    Hi everyone, I am having a problem with calculating total scores for my measuring instruments on SPSS. If a case has a missing value on one item...

    Started by Arooba‎, 04-21-2015 04:49 AM
    • Replies: 1
    • Views: 2,242
    04-21-2015, 08:16 AM Go to last post
  26. Method to estimate whether two data sets are from the same distribution

    Hello, I have two data sets from two different experiments. I would like to know whether there exist Bayesian (or frequentist) methods which would...

    Started by Urian666‎, 04-20-2015 07:34 AM
    • Replies: 4
    • Views: 2,138
    04-20-2015, 04:13 PM Go to last post
  27. reduced-form system

    Hi, I am buiding a supply and demand model. I have one price and one demand equation and would like to compare the different coeffecients through...

    Started by bodesmiller‎, 04-18-2015 12:31 PM
    • Replies: 2
    • Views: 1,345
    04-19-2015, 10:11 AM Go to last post
  28. Price forecasting model

    I am working on a problem where I have an item 'x' which is available in local market and 'x' is produced using item 'y'.Item 'y' is traded in...

    Started by TheMonkster‎, 04-17-2015 04:01 AM
    correlation analysis, forecasting, regression analysis
    • Replies: 2
    • Views: 2,114
    04-18-2015, 11:57 PM Go to last post
  29. help with finding corelation of 2 variable data

    Hi all This is my first post May be this is a dumb question but I need quick help please I have data for 95 people Outcome scored by doctors...

    Started by Harrybaba‎, 04-17-2015 12:46 PM
    • Replies: 0
    • Views: 2,090
    04-17-2015, 12:46 PM Go to last post
  30. Meta Analysis: combining effect sizes from means/SDs , F statistics and t statistics

    After coding several hundred papers, I have accumulated a list of effect sizes (Cohen's d) for various learning interventions. Most of these have...

    Started by timshel‎, 04-16-2015 06:52 PM
    • Replies: 0
    • Views: 1,975
    04-16-2015, 06:52 PM Go to last post
  31. Time 2 Sample Size

    Hi I was hoping for some advice. I'm looking at the same sample at 2 timepoints. At the first time point I had 95 participants and at follow up I...

    Started by Psy86‎, 04-16-2015 06:32 AM
    • Replies: 2
    • Views: 1,514
    04-16-2015, 01:26 PM Go to last post
  32. Standard Deviation Conversion

    For my masters thesis I am conducting a meta-analysis looking at the differences in CHC abilities within Autism Spectrum Disorders. I have gathered...

    Started by slgur81‎, 04-16-2015 04:13 AM
    • Replies: 0
    • Views: 1,547
    04-16-2015, 04:13 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: 1,512
    04-09-2015, 10:29 PM Go to last post
  34. Help with a Poisson Regression Equation

    I have attached an image of an equation of Poisson Regression that i am working on. I want to understand it a bit as i am new to stats. can anyone...

    Started by rushan‎, 04-08-2015 05:37 AM
    • Replies: 1
    • Views: 1,053
    04-09-2015, 11:13 AM Go to last post
  35. sample size calcs - why do these produce different results

    What are the interpretations for each of these? data a; input z p q e; cards; 1.96 0.95 0.05 0.05 ; data b; set a; ...

    Started by msecic‎, 04-07-2015 08:19 AM
    confidence interval, hypothesis test, sample size, sas
    • Replies: 2
    • Views: 1,391
    04-07-2015, 09:53 AM Go to last post
  36. 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: 6,705
    04-07-2015, 06:21 AM Go to last post
  37. need help desperatly: which test to choose

    Hi everyone, I need your help :confused: I would like to compare the monthly income composition of people between two countries. The monthly income...

    Started by kodie‎, 04-04-2015 03:45 PM
    • Replies: 3
    • Views: 1,523
    04-05-2015, 06:02 AM Go to last post
  38. Which forecast methods?

    please delete the thread

    Started by Jariel‎, 04-02-2015 05:21 PM
    • Replies: 0
    • Views: 1,167
    04-02-2015, 05:21 PM Go to last post
  39. margin of error

    I have two questions as follows: *Is there a way to apply the margin of error to achieve 99.99% level of confidence? *Can I use the margin of...

    Started by eunkum‎, 04-02-2015 12:13 PM
    • Replies: 1
    • Views: 546
    04-02-2015, 12:27 PM Go to last post
  40. Bigger sample size and less good results or smaller sample size but better results

    I hope this is the right place to post this question. I'm doing my thesis based upon the data of my professors research study. I want to look into...

    Started by Singalore‎, 04-02-2015 10:15 AM
    effect size, sample size
    • Replies: 0
    • Views: 1,662
    04-02-2015, 10:15 AM Go to last post
  41. Can Factor Analysis be used for non normal distribution ?

    Hi My questionnaire is based on 300 respondents opinion on the benefits of implementing of policy changes for which I had used5 point Likert's...

    Started by CAShobana‎, 03-31-2015 11:28 PM
    • Replies: 3
    • Views: 1,746
    04-01-2015, 12:43 PM Go to last post
  42. PhD Dissertation Help- General guidance and direction desperately needed!!!!

    Hi, I have been reading many of your comments and I was hoping that you could give me advice. I'm currently in my second year of the dissertation...

    Started by Penny_BBT‎, 03-26-2015 04:48 PM
    • Replies: 2
    • Views: 1,065
    04-01-2015, 08:40 AM Go to last post
  43. 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: 3,039
    04-01-2015, 06:44 AM Go to last post
  44. Can I use a Negative Binomial Regression for a Continuous Outcome?

    Hello, My outcome is Sugar intake with a highly skewed continuous outcome variable. The histogram and variable details are Attached. Since the...

    Started by lexareef‎, 03-31-2015 12:40 PM
    • Replies: 0
    • Views: 1,109
    03-31-2015, 12:40 PM Go to last post
  45. heterogenous regression slopes in mancova

    Hey guys, I have a little problem with my MANCOVA data (4 DVs, 3 Covariates). For one of the covariates and one of the DVs, the assumption of...

    Started by mbo‎, 03-29-2015 07:14 AM
    mancova, regression slopes
    • Replies: 0
    • Views: 1,211
    03-29-2015, 07:14 AM Go to last post
  46. Is t-test appropriate for comparing percentages?

    I am trying to analyze a seed germination trial comparing 2 different germination treatments. I sowed seeds from 10 individual plants in 10...

    Started by elmorem‎, 03-25-2015 09:04 PM
    binary data, comparing percentages, comparing rates, t-test
    • Replies: 1
    • Views: 1,346
    03-29-2015, 05:57 AM Go to last post
  47. single function of two gaussian distributed variables..

    Hi Folks, I have a two 2 dimenstional gaussian function of variables x and y and of their respective standard deviations. I have single valued...

    Started by Farzad‎, 03-28-2015 12:48 PM
    • Replies: 3
    • Views: 1,392
    03-29-2015, 05:48 AM Go to last post
  48. What statistical test do I use to tell if my data statistically significant?

    This is for a PhD experiment I am working on. I have 5 types of rock samples. I am trying to understand how their ability to preserve a type of...

    Started by galaxz‎, 03-27-2015 08:12 PM
    correlations, statistical significance
    • Replies: 0
    • Views: 1,111
    03-27-2015, 08:12 PM Go to last post
  49. 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: 970
    03-27-2015, 02:06 PM Go to last post
  50. Marginal of Gaussian

    I have a slight problem with the marginal distribution of a Gaussian. First, assume (d,r) are jointly Gaussian of dimension 2n. It is known that d...

    Started by Tosha‎, 03-26-2015 12:36 PM
    • Replies: 2
    • Views: 1,279
    03-26-2015, 04:43 PM Go to last post
  51. Taguchi designs

    Dear TalkStats Forum, I am using Taguchi design in my experiments. I have a presentation soon and I want to explain this design in a very dynamic...

    Started by diegorg‎, 03-26-2015 12:09 PM
    • Replies: 1
    • Views: 1,465
    03-26-2015, 03:31 PM Go to last post
  52. descriptive correlational study


    Started by JAR‎, 03-25-2015 12:17 PM
    • Replies: 1
    • Views: 1,294
    03-25-2015, 01:30 PM Go to last post
  53. If anyone can help please!! In DESPERATE need of clarification!

    Hi Everyone This is my first time on the site. Basically I am conducting some research for a dissertation I have to do as part of my course. ...

    Started by lily2190‎, 03-24-2015 11:47 AM
    binomial, chi sq, spss
    • Replies: 2
    • Views: 1,321
    03-25-2015, 03:17 AM Go to last post
  54. Poll Poll: Ordinal or continuous scale?

    Hello, I have carried experiments where the participants were asked to rate a parameter on a scale. The scale starts from “not heavy” to “heavy”;...

    Started by emmenru‎, 03-23-2015 05:57 AM
    • Replies: 0
    • Views: 1,117
    03-23-2015, 05:57 AM Go to last post
  55. Comparing subsets of data from the same population?

    I'm hoping someone can help me conceptualize my question better because I have a feeling I'm looking at it the wrong way. I'm looking at a number of...

    Started by sosaysi‎, 03-19-2015 04:16 PM
    • Replies: 0
    • Views: 1,396
    03-19-2015, 04:16 PM Go to last post
  56. Control Variable as part of the Dependent Variable - Problem? Solutions?

    Dear all, I'm currently trying to figure out the following problem: I have a dependent variable which is build as the standard deviation of six...

    Started by StatisticlyClueless‎, 03-15-2015 07:48 AM
    • Replies: 2
    • Views: 1,596
    03-19-2015, 08:36 AM Go to last post
  57. Modeling ordinal responses with nested data

    Hello, I am preparing a study that would involve modeling responses an ordinal scale. These responses identify the behaviors of high school...

    Started by libertylanding‎, 03-18-2015 11:09 AM
    • Replies: 1
    • Views: 1,246
    03-18-2015, 11:40 AM Go to last post
  58. Post Statistical Model to Use for 1 independent variable and 2 dependent variables

    Hello,i'm Oliver John a civil engineering undergrad student.I'm quiet uncertain unto which statistical analysis should i use for my data consisting...

    Started by oliverjohn‎, 03-17-2015 01:42 AM
    • Replies: 0
    • Views: 1,071
    03-17-2015, 01:42 AM Go to last post
  59. Derivation of OLS residuals and asymptotic properties

    Hello, Im stuck with this questions. Its asking for the derivation of asymptotic properties of 1/n*(sum of ehat^3) where ehat is the residual of...

    Started by artzahar‎, 03-11-2015 07:45 PM
    • Replies: 0
    • Views: 1,074
    03-11-2015, 07:45 PM Go to last post
  60. Post [ASK] [Quantification Theory Type I] Kansei Engineering Reference

    Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

    Started by Gema‎, 08-23-2014 12:44 AM
    • Replies: 1
    • Views: 3,383
    03-11-2015, 05:17 PM Go to last post

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