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 04:56 AM
    • Replies: 14
    • Views: 4,374
    10-11-2014, 01:02 PM Go to last post
  1. Analyzing data - what tools should I use?

    Hello, I am analyzing data of seat distribution among different types of rail wagons. I have m types of wagons and n seats. What I want to achieve...

    Started by pockoc‎, Today 03:13 AM
    • Replies: 1
    • Views: 116
    Today, 08:47 AM Go to last post
  2. Trying to find MS Excel Wilcoxon Rank Sum test example

    I am a pharmacy student doing a 4th year (final year) Capstone Research Project. I am attempting to run my data utilizing a Wilcoxon Rank Sum Test...

    Started by alkamas‎, 11-29-2015 05:32 PM
    help please, wilcoxon rank sum test
    • Replies: 0
    • Views: 101
    11-29-2015, 05:32 PM Go to last post
  3. [wilcoxon/paired t test] when to exclude data? Not normally distributed data.

    Hello! I ran an analysis of my data of research into a repeated measures design and found the difference of both conditions to be not normally...

    Started by LoudWhisper‎, 11-28-2015 05:01 AM
    • Replies: 1
    • Views: 139
    11-28-2015, 08:10 AM Go to last post
  4. How to differentiate between a global and a local method?

    Hello, I am trying to write a report based on prediction models and my topic requires me to cover one global method(regression for example) and a...

    Started by Nickie‎, 11-16-2015 07:01 PM
    global, help needed, local, prediction, question
    • Replies: 1
    • Views: 174
    11-27-2015, 05:14 AM Go to last post
  5. How should I further analyse this result?

    I have following variables: -"adtype" (1 is print ad with testimonials, 2 is print ad without testimonials.) -"AT1" which is "ad attitude...

    Started by yue86231‎, 11-24-2015 09:45 AM
    • Replies: 4
    • Views: 202
    11-27-2015, 04:55 AM Go to last post
  6. Costant coefficient in logit model

    Hello, I would like to make sure of my argument. Am I right when I say that a constant coefficient in logit model MUST BE close to zero ?? ...

    Started by russel2000‎, 11-21-2015 09:33 AM
    • Replies: 8
    • Views: 333
    11-23-2015, 11:51 AM Go to last post
  7. 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: 110
    11-23-2015, 05:57 AM Go to last post
  8. Help understanding results of this radomized controlled trial.

    In the following published paper linked to below, could someone explain the meaning of this quote: Link to publication that the quote is from:...

    Started by 7055‎, 11-21-2015 05:44 PM
    • Replies: 2
    • Views: 182
    11-22-2015, 10:20 AM Go to last post
  9. Post One response variable and multiple explanatory variables (numeric and factor values)

    Hello everyone, I am a master student in Biology. I am now trying to analyse my thesis data, but I am facing a problem: I do not understand which...

    Started by Cass123‎, 11-15-2015 11:48 AM
    • Replies: 7
    • Views: 306
    11-21-2015, 01:30 PM Go to last post
  10. binary choice with fisheries data over time

    Hi all, I am new to the forum so please bear with me if I am not following protocol in my post. I have fisheries data which is vessel specific....

    Started by senegale‎, 11-17-2015 03:31 PM
    • Replies: 4
    • Views: 234
    11-19-2015, 02:19 PM Go to last post
  11. Testing Model Fit between Subsets of Data When Using Multilevel Models

    When using multilevel models based on maximum likelihoods, one can use either deviance statistics (e.g., -2LLs) for nested models or information...

    Started by 3.14159‎, 11-18-2015 03:49 PM
    maximum likehood, model fit, mulitilevel model
    • Replies: 0
    • Views: 135
    11-18-2015, 03:49 PM Go to last post
  12. MSE in GLM ANOVA

    Sorry for the wall of text, but I'm trying to figure out how to proceed and feel as though I need to clue you in as best I can. Experimental...

    Started by elduderino260‎, 11-16-2015 08:20 PM
    • Replies: 3
    • Views: 166
    11-17-2015, 01:29 PM Go to last post
  13. Multiple measurement time series

    Hi dear helper, I have a collection of monitoring data which I want to analyze as to significant differences over time. I have monitored 2 groups...

    Started by Tass‎, 11-13-2015 02:40 AM
    nultiple values, time series
    • Replies: 2
    • Views: 140
    11-17-2015, 08:43 AM Go to last post
  14. 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: 114
    11-17-2015, 06:09 AM Go to last post
  15. Do you need to standardise data before running MCA?

    I have both ordinal and categorical data and am attempting to perform a Multiple correspondence analysis. My question is if a dataset contains a...

    Started by Juliavv‎, 11-17-2015 03:28 AM
    mca, ordination, standardization
    • Replies: 1
    • Views: 136
    11-17-2015, 05:24 AM Go to last post
  16. Cronbach's alpha and Cohen's Kappa (CA & CK)

    Is there any effective difference between CA and a weighted-CK? Anyone any thoughts?

    Started by Philyuko‎, 02-04-2009 09:32 AM
    • Replies: 2
    • Views: 6,127
    11-15-2015, 04:32 PM Go to last post
  17. Justification for running an ANOVA after receiving non significant results on MANOVA

    Hi I ran a MANOVA model, with 2 DV's (2 groups of adolescents) and 1 IV with 3 categories ("strategies"). I got a non significant result, with P....

    Started by MichHoch‎, 11-15-2015 06:17 AM
    anova observations, manova bonferroni, publication, results
    • Replies: 0
    • Views: 122
    11-15-2015, 06:17 AM Go to last post
  18. 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: 139
    11-14-2015, 11:09 PM Go to last post
  19. Cool Is AR(1)-ARCH(1) covariance stationary?

    I'm becoming confused by this. Say I have the following model: I know that an AR(1) is covariance stationary if |\phi|<1. I also know...

    Started by A_Jo‎, 11-13-2015 10:11 PM
    arch, arma, covariance, stationary, time series
    • Replies: 1
    • Views: 140
    11-14-2015, 07:29 PM Go to last post
  20. What type of test should I use?

    I am trying to determine whether being involved in an extracurricular activity has an impact on different course grades (dependent variable),...

    Started by econh‎, 11-14-2015 12:57 AM
    • Replies: 2
    • Views: 198
    11-14-2015, 04:39 PM Go to last post
  21. log likelihood function ARMA

    To derive the log-likelihood function of an MA(1) we condition on \epsilon_0 . But when deriving the log-likelihood function function for an AR(1)...

    Started by rydams‎, 11-14-2015 06:20 AM
    arma, likelihood function, log likelihood
    • Replies: 1
    • Views: 158
    11-14-2015, 04:30 PM Go to last post
  22. How should I explain this results?

    The hypothesis is: the willing-to-pay is higher when people see print ad with testimonial. So there are four print ads 1. 1 cola ad with...

    Started by yue86231‎, 11-13-2015 07:57 AM
    • Replies: 4
    • Views: 188
    11-14-2015, 01:34 PM Go to last post
  23. Theory of p value matching????

    I am required to write about this for my lit review. I asked the stats lecturer but he said he never heard of it! could anyone hazard a guess to...

    Started by akav‎, 11-13-2015 10:16 AM
    • Replies: 7
    • Views: 223
    11-13-2015, 02:25 PM Go to last post
  24. proper analysis of a 3x3 contingency table

    I have some data on how male-female pairs spend their time in an undergraduate level physics lab. Their activity is classified as either: using the...

    Started by jday‎, 11-03-2015 05:43 PM
    • Replies: 3
    • Views: 300
    11-13-2015, 01:02 AM Go to last post
  25. Trouble with 3D geometric morphometrics/PCAs

    Hi all, I've been doing some 3D shape analyses using landmarks and analysed the resulting data using PCAs. I'm not very familiar with all this so...

    Started by SRuhl‎, 11-05-2015 05:52 AM
    3dgm, landmark, pca, shape analysis
    • Replies: 1
    • Views: 165
    11-13-2015, 12:55 AM Go to last post
  26. statistical test confius

    hii... any one need to help me... currently im doing research about pollution.. can any one suggest what test can i do since i using questinnaire...

    Started by daus90‎, 11-05-2015 10:42 AM
    • Replies: 4
    • Views: 266
    11-13-2015, 12:49 AM Go to last post
  27. Need help determining proper test, im confused

    Describe relationship between mother and father's education. I recoded each into three levels. I think it is spearman rho, but second part of...

    Started by Jay Kenyon‎, 11-08-2015 02:57 AM
    • Replies: 1
    • Views: 183
    11-13-2015, 12:36 AM Go to last post
  28. Calculate chance level in multiple choice

    Hello everyone. In short: I would like to know how to compute the chance-level of an 8-alternative multiple choice questionnaire with 6 questions....

    Started by Pernelle‎, 11-08-2015 07:27 AM
    • Replies: 1
    • Views: 130
    11-12-2015, 11:28 PM Go to last post
  29. Which Test for Comparing a Group Pre and Post

    A group of people have participated in a program That group of people have completed a questionnaire pre and post program Because it is a...

    Started by Joelymac‎, 11-08-2015 12:35 PM
    • Replies: 3
    • Views: 198
    11-12-2015, 11:12 PM Go to last post
  30. Hybrid Network Inference

    I'm trying to figure out how to calculate the result mean and variance for a simple hybrid bayesian network comprised of 2 variables (to keep things...

    Started by Mark Balmer‎, 11-12-2015 09:30 AM
    bayesian network, continuous
    • Replies: 0
    • Views: 103
    11-12-2015, 09:30 AM Go to last post
  31. advice on how to proceed

    Hello, I recently undertook to analyze a relatively simple data set. It includes estimates of tree species composition for several sites within...

    Started by wdmn‎, 11-07-2015 12:11 AM
    • Replies: 6
    • Views: 370
    11-10-2015, 12:37 PM Go to last post
  32. Various Statistical Methods and their Functioning

    Hey everyone! I had a few questions regarding certain statistical methods I am researching. I've found a peer-reviewed journal article dealing...

    Started by Bananas‎, 10-28-2015 03:35 PM
    • Replies: 7
    • Views: 404
    11-10-2015, 01:33 AM Go to last post
  33. Confidence intervals in population-based study?

    Hello everyone, I have a question that might be quite simple. I'm planning a population-based study with very basic statistical analyses (mostly...

    Started by ehi895‎, 11-01-2015 07:32 AM
    • Replies: 2
    • Views: 273
    11-09-2015, 11:56 AM Go to last post
  34. Multivariate generalization of Poisson-Gamma model?

    Hello! I actually assumed it would be easy to find a multivariate version of the Poisson distribution, but couldn't find any concrete solution (in...

    Started by abdhk383‎, 10-29-2015 09:01 AM
    • Replies: 0
    • Views: 223
    10-29-2015, 09:01 AM Go to last post
  35. sample size for repeated measures

    Greetings everyone, a friend needs some stats help on her doctoral thesis. She is conducting a longitudinal, follow up, study on the same...

    Started by ivn‎, 10-29-2015 03:41 AM
    • Replies: 0
    • Views: 191
    10-29-2015, 03:41 AM Go to last post
  36. ANOVA - which one to use?

    Hello, we are doing an experiment where body consistence (weight, proportion of muscles, fat, water in body etc.) is measured. We have 103...

    Started by KatkaK‎, 10-24-2015 06:32 PM
    • Replies: 3
    • Views: 318
    10-28-2015, 03:38 AM Go to last post
  37. Kruskal-Wallis or Poisson regression for parasite count data?

    Trying to figure out how best to carry out this analysis... So essentially I have four different species of Deer mice, infected with a high, medium,...

    Started by zoonotic‎, 10-27-2015 11:12 AM
    count data, kruskal-wallis, parasitology, poisson regression
    • Replies: 4
    • Views: 228
    10-27-2015, 06:28 PM Go to last post
  38. Dropping observation

    Hello I am too embarrassed to ask it as it looks very easy but I did not find answers to it and I tried hard. I have a sample of 5000...

    Started by yaelcohen‎, 10-26-2015 02:39 AM
    • Replies: 1
    • Views: 283
    10-26-2015, 08:47 PM Go to last post
  39. How do I use PERMANOVA/interpret the results

    I am doing this research project comparing the snail community across two species of sea grass. Ten sample quadrats were collected from each sea...

    Started by Nithya‎, 10-24-2015 06:18 AM
    • Replies: 1
    • Views: 269
    10-24-2015, 08:52 AM Go to last post
  40. Suggestions PLEASE.

    I work for a company that sells products online. I am attempting to create a common sense SOP for our email marketing campaigns and have plenty...

    Started by m_edmonson‎, 10-21-2015 03:47 PM
    • Replies: 8
    • Views: 438
    10-22-2015, 06:22 PM Go to last post
  41. Critiques Requested on Resampling as an Approach

    I found an old piece code I wrote. I had a logistic model with a multiplicative interaction term consisting of two binary variables plus model...

    Started by hlsmith‎, 10-22-2015 10:50 AM
    • Replies: 6
    • Views: 270
    10-22-2015, 04:23 PM Go to last post
  42. ANOVA or Correlational analysis? Which one to use?

    Hello everyone, I am currently working on my dissertation and aim to identify the relationship between parent-child interaction and behavior of...

    Started by Andy26‎, 10-18-2015 03:25 PM
    • Replies: 4
    • Views: 355
    10-22-2015, 07:35 AM Go to last post
  43. 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 07:24 AM
    • Replies: 0
    • Views: 210
    10-20-2015, 07:24 AM Go to last post
  44. Red face Multinomial probabilty

    Hi, Could anyone suggest what test should I apply in the case I have probabilities of 0. For example, I have a vector of counts 127,2,1,0 and I...

    Started by Moriahco‎, 10-14-2015 08:46 AM
    chi sq test, distibution, multinomial, proability
    • Replies: 1
    • Views: 330
    10-14-2015, 01:40 PM Go to last post
  45. Multiple correspondence analysis with fuzzy coding

    Hello, I have a data set with six continuous variables. I would like to perform a multiple correspondence analysis (MCA) with fuzzy coding. I was...

    Started by Roni7‎, 10-12-2015 09:42 AM
    correspondence analysis, fuzzy coding, mca
    • Replies: 0
    • Views: 254
    10-12-2015, 09:42 AM Go to last post
  46. Testing of correlation coefficients

    Hello, I am wondering if there is any way to test the significance of the correlation coefficients provided in the Eviews 7 cross-correlogram....

    Started by tpk1001‎, 10-11-2015 03:46 PM
    • Replies: 0
    • Views: 229
    10-11-2015, 03:46 PM Go to last post
  47. Choosing test for dependent anonymous sample comparisons

    I have data collected each year from 2010-2015. In this data I have demographic information and a self-reported score on a 5 pt Likert scale. The...

    Started by LCart‎, 10-08-2015 08:24 AM
    comparing means, dependent samples, statistical analysis
    • Replies: 0
    • Views: 257
    10-08-2015, 08:24 AM Go to last post
  48. Difference between samples in terms of frequency ranks

    I have 3 different texts, and for each one of them, I have the frequencies of 25 letters appearing in those texts (Text A, letter A, freq = 5013;...

    Started by NoelAramis‎, 10-07-2015 02:57 AM
    frequency, kruskal-wallis, ranking, ranks
    • Replies: 0
    • Views: 265
    10-07-2015, 02:57 AM Go to last post
  49. How to do a post hoc analysis on non-parametric data in SAS

    Good morning! I know there is a statistically significant difference between groups for my non-parametric data-set but I'm not sure how to find...

    Started by Jenny0‎, 10-02-2015 11:36 AM
    nonparametric, sas
    • Replies: 2
    • Views: 365
    10-02-2015, 02:05 PM Go to last post
  50. Please read me.

    Hi guys, please read me. I need your help. I am a medical student and I am confused with statistics for my research. Ive seen videos in youtube but...

    Started by amitaf‎, 10-02-2015 05:09 AM
    • Replies: 2
    • Views: 280
    10-02-2015, 08:32 AM Go to last post
  51. How to analyse 5-point likert data with different questions under 1 subset?

    I am working on a research assignment, and has received enough data for analysis In the project, I used health belief model (HBM) to investigate...

    Started by Hack‎, 10-22-2013 02:59 PM
    • Replies: 1
    • Views: 690
    10-01-2015, 09:23 AM Go to last post
  52. Agreement between studies- which test is appropriate?

    I'm not using questionnaire. I need to find the agreement between previous studies on the elements of sustainability practice in campus. I'm applying...

    Started by fariha‎, 09-29-2015 03:28 AM
    • Replies: 3
    • Views: 305
    10-01-2015, 03:33 AM Go to last post
  53. Effect-size Two-way ANOVA repeated measures

    Dear statistical experts, I am getting confused on how to compute effect size in two-way ANOVA with repeated measures. - Should I use Cohen d...

    Started by tkdn‎, 09-30-2015 07:14 AM
    • Replies: 0
    • Views: 214
    09-30-2015, 07:14 AM Go to last post
  54. Test for difference between ratio of means, unequal variance.

    Hello there, I an experimental design were I wish to test if the effect of a treatment on several subjects type is different to the effect of...

    Started by Sudders‎, 04-05-2011 05:01 PM
    • Replies: 5
    • Views: 4,508
    09-30-2015, 12:58 AM Go to last post
  55. Calculating likelihood for a particular biological sample. Is is possible?

    Hi you all! I've got a problem when trying to analyze some biological data in my PhD. Let's say that I'm interested in performing an analysis...

    Started by EuGENE‎, 09-29-2015 07:42 AM
    biological statistics, likelihood, likelihood ratio test, non parametric
    • Replies: 0
    • Views: 235
    09-29-2015, 07:42 AM Go to last post
  56. Coding Group Equivalency on Pre-Treatment Measures for Meta-Analysis?

    Hello- I am constructing a code book for a meta-analysis. I only want to include evaluations where program and comparison groups were reasonably...

    Started by yellowhair03‎, 09-28-2015 12:41 AM
    meta analysis, meta-analysis, meta-regression, standard deviation, statistical research
    • Replies: 0
    • Views: 224
    09-28-2015, 12:41 AM Go to last post
  57. Cell culture experiments - parametric testing when there are only three repeats!

    Felt this was a theoretical discussion point. My thesis includes cell culture experiments with 100,000 cells per condition repeated three times....

    Started by drgpenman‎, 09-22-2015 02:06 PM
    • Replies: 0
    • Views: 440
    09-22-2015, 02:06 PM Go to last post
  58. Suggestions for model fit with unusual data set?

    Good morning, I'm struggling to fit a satisfactory model to a data set I have resulting from a systematic review. I performed a systematic review...

    Started by samuelle‎, 09-21-2015 06:26 AM
    ecology, economics, meta analysis, meta-regression, small sample
    • Replies: 0
    • Views: 320
    09-21-2015, 06:26 AM Go to last post
  59. Diebold and Mariano Test

    Hello, I'm currently writing an article about stock return predictability. I have 2 predictive regression models, where I calculated for both the...

    Started by tjeu‎, 04-06-2012 03:24 AM
    • Replies: 1
    • Views: 4,101
    09-18-2015, 02:21 PM Go to last post
  60. What is Endogeneity?

    Hi! The title says it all. I am a health care worker currently going through a really interesting paper. I have some experience in statistics but...

    Started by plagoniste‎, 09-17-2015 04:31 PM
    • Replies: 11
    • Views: 386
    09-17-2015, 09:44 PM Go to last post

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