1. 10-14-2010
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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 03:56 AM
    • Replies: 14
    • Views: 2,832
    10-11-2014, 12:02 PM Go to last post
  1. Question Is regrouping allowed here (ANOVA)?

    Dear community We measured the relative area of a protein (area protein/area tissue) in different compartments (ROI.name) of a tissue piece (see...

    Started by Koen2704‎, Today 04:15 AM
    • Replies: 1
    • Views: 28
    Today, 06:47 AM Go to last post
  2. Correction for multiple testing or not?

    Hi all. I hope you can help me out! I have performed two microarray analyses: 1. Effect of knockdown of gene A on global gene expression levels...

    Started by tuur‎, Today 04:15 AM
    • Replies: 0
    • Views: 25
    Today, 04:15 AM Go to last post
  3. Monte-Carlo simulation of repeated-measures ANOVA

    Hello, I want to conduct a Monte-Carlo simulation of a repeated-measures ANOVA. The random numbers used for the simulation need to have specified...

    Started by Kes‎, Yesterday 05:07 AM
    anova, monte carlo, repeated measures
    • Replies: 0
    • Views: 73
    Yesterday, 05:07 AM Go to last post
  4. Is ANOVA biased compared to ANCOVA?

    Can we consider ANOVA is biased compared to ANOCOVA despite that the normality is still maintained in ANOVA?

    Started by isaacadel‎, 05-23-2015 10:26 AM
    • Replies: 1
    • Views: 192
    05-26-2015, 11:54 PM Go to last post
  5. 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
    • Replies: 1
    • Views: 133
    05-26-2015, 07:04 AM Go to last post
  6. Spearman’s rho & the uncountability of the Real Numbers

    I’m working on the write-up to transform my comprehensive exam on the Spearman rank correlation into a publishable article and would like to gather...

    Started by spunky‎, 05-25-2015 04:40 PM
    • Replies: 0
    • Views: 100
    05-25-2015, 04:40 PM Go to last post
  7. Business location statistics.

    I'm interested in researching business statistics and possible factors involved which will determine a good business location. For example, If I am...

    Started by britishchick‎, 05-23-2015 04:11 AM
    • Replies: 0
    • Views: 92
    05-23-2015, 04:11 AM Go to last post
  8. How to calculate significant differences in correlation using stata/spss

    Hello, This is probably a fairly simple question but I don't know to handle it properly. I have monthly data of 2 categories. Each category...

    Started by daydreamer‎, 05-22-2015 11:53 AM
    • Replies: 1
    • Views: 130
    05-23-2015, 03:47 AM Go to last post
  9. Question Mixed model with time-varying covariate - are correlations between covariates bad?

    Hi everyone, I have a question regarding the correlation between predictors in a model, and whether I should worry about it in my specific case....

    Started by Lara333‎, 05-22-2015 09:13 AM
    mixed, repeated-measures, time-varying covariate
    • Replies: 0
    • Views: 93
    05-22-2015, 09:13 AM Go to last post
  10. Can I use Partial Eta Squared for t-tests?

    Hi, I am currently trying to decide which effect size is the most appropriate for my results. I have conducted a repeated measures ANOVA, there...

    Started by heather88‎, 05-22-2015 05:47 AM
    effect size., partial eta squared, t-tests
    • Replies: 0
    • Views: 87
    05-22-2015, 05:47 AM Go to last post
  11. Red face Cramer's V

    Hi all, Just have a question about Cramer's V. I'm doing some analysis on education levels of partners; male partners vs. female partners. In the...

    Started by AvMac‎, 05-20-2015 08:58 PM
    cramer's v
    • Replies: 2
    • Views: 147
    05-21-2015, 09:05 PM Go to last post
  12. Question regarding which ANOVA to use

    I am working on a research project involving heavy metal accumulation in mussels. I am examining both spatial and temporal trends at 3 different...

    Started by nikhil‎, 05-21-2015 01:22 PM
    • Replies: 1
    • Views: 108
    05-21-2015, 02:21 PM Go to last post
  13. 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: 144
    05-19-2015, 01:02 AM Go to last post
  14. 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: 1,293
    05-18-2015, 04:16 PM Go to last post
  15. 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: 146
    05-18-2015, 12:27 PM Go to last post
  16. 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: 200
    05-16-2015, 07:10 AM Go to last post
  17. 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: 116
    05-16-2015, 05:35 AM Go to last post
  18. 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: 130
    05-14-2015, 05:27 PM Go to last post
  19. 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: 207
    05-14-2015, 02:22 AM Go to last post
  20. 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: 2,161
    05-11-2015, 07:48 AM Go to last post
  21. 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: 152
    05-10-2015, 10:47 PM Go to last post
  22. 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: 130
    05-10-2015, 04:48 PM Go to last post
  23. 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 07:24 AM
    • Replies: 14
    • Views: 2,779
    05-09-2015, 07:04 AM Go to last post
  24. 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: 220
    05-07-2015, 10:08 AM Go to last post
  25. 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: 149
    05-06-2015, 04:23 AM Go to last post
  26. 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: 181
    05-03-2015, 04:25 PM Go to last post
  27. 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: 222
    05-01-2015, 09:58 AM Go to last post
  28. Question Comparison of time series nested in Repeated Measures Design

    The title might not do justice to the question I want to ask, but it's the best I came up with. Background In my experimental design study 30...

    Started by karan85‎, 04-30-2015 11:30 AM
    • Replies: 0
    • Views: 151
    04-30-2015, 11:30 AM Go to last post
  29. 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: 137
    04-29-2015, 04:53 AM Go to last post
  30. 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: 505
    04-28-2015, 09:25 PM Go to last post
  31. 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: 100
    04-28-2015, 08:15 PM Go to last post
  32. 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: 223
    04-28-2015, 04:43 AM Go to last post
  33. 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: 316
    04-22-2015, 03:48 PM Go to last post
  34. 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: 197
    04-22-2015, 10:33 AM Go to last post
  35. 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: 196
    04-21-2015, 10:28 AM Go to last post
  36. 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: 219
    04-21-2015, 09:34 AM Go to last post
  37. 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: 157
    04-21-2015, 08:16 AM Go to last post
  38. 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: 259
    04-20-2015, 04:13 PM Go to last post
  39. 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: 258
    04-19-2015, 10:11 AM Go to last post
  40. 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: 280
    04-18-2015, 11:57 PM Go to last post
  41. 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: 169
    04-17-2015, 12:46 PM Go to last post
  42. 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: 222
    04-16-2015, 06:52 PM Go to last post
  43. 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: 212
    04-16-2015, 01:26 PM Go to last post
  44. 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: 136
    04-16-2015, 04:13 AM Go to last post
  45. 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: 297
    04-09-2015, 10:29 PM Go to last post
  46. 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: 273
    04-09-2015, 11:13 AM Go to last post
  47. 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: 313
    04-07-2015, 09:53 AM Go to last post
  48. 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: 593
    04-07-2015, 06:21 AM Go to last post
  49. 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: 315
    04-05-2015, 06:02 AM Go to last post
  50. Which forecast methods?

    please delete the thread

    Started by Jariel‎, 04-02-2015 05:21 PM
    • Replies: 0
    • Views: 288
    04-02-2015, 05:21 PM Go to last post
  51. 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: 209
    04-02-2015, 12:27 PM Go to last post
  52. 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: 188
    04-02-2015, 10:15 AM Go to last post
  53. 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: 308
    04-01-2015, 12:43 PM Go to last post
  54. 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: 285
    04-01-2015, 08:40 AM Go to last post
  55. 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: 243
    04-01-2015, 06:44 AM Go to last post
  56. 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: 212
    03-31-2015, 12:40 PM Go to last post
  57. 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: 224
    03-29-2015, 07:14 AM Go to last post
  58. 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: 298
    03-29-2015, 05:57 AM Go to last post
  59. 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: 279
    03-29-2015, 05:48 AM Go to last post
  60. 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: 251
    03-27-2015, 08:12 PM Go to last post

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