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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: 19,435
    10-11-2014, 12:02 PM Go to last post
  1. Angry Simple or Factorial Experiment Could I Chose?

    Dear, friends, scientests, and researchers I conducted an experiment to study two factors, first was irrigation method (I) which consisted 2...

    Started by hazemalashwal‎, 12-28-2015 08:55 AM
    • Replies: 1
    • Views: 1,362
    12-28-2015, 09:00 AM Go to last post
  2. what does rejecting the hypothesis mean

    Hi, so I'm new to statistics and am not very comfortable with it yet. It may be a very simple question, but I'm finding this very difficult to...

    Started by madhu‎, 12-28-2015 06:34 AM
    hypotheses, hypotheses testing, hypothesis
    • Replies: 0
    • Views: 830
    12-28-2015, 06:34 AM Go to last post
  3. Question Bayesian parameter estimation via MCMC?

    Hi folks. I have the following question. I have a model M containing 20 adjustable parameters k = {k_j}. I also have 40-50 measured...

    Started by witziger_Fuchs‎, 12-15-2015 08:49 AM
    • Replies: 2
    • Views: 1,818
    12-26-2015, 02:34 AM Go to last post
  4. Which Tests to applicate for Trends?

    Hi everyone, it's christmas time again, which for me means, some free time :) During my free time I looked to acquire a bit more knowledge in some...

    Started by horror‎, 12-23-2015 08:42 AM
    • Replies: 2
    • Views: 1,580
    12-23-2015, 12:49 PM Go to last post
  5. paired samples

    Hello! I have two separate group. On each group, I could have done paired samples t-test, but I want to compare between the two of them- is there...

    Started by talgef‎, 12-21-2015 06:56 AM
    • Replies: 5
    • Views: 1,642
    12-21-2015, 01:06 PM Go to last post
  6. Enrichment / over-representation of pairs, triplets, quadruples, etc.

    Due to a lack of interest from users for over a month I would like to delete this thread.

    Started by Adam Przedniczek‎, 12-19-2015 04:01 PM
    enrichment, over-representation
    • Replies: 0
    • Views: 917
    12-19-2015, 04:01 PM Go to last post
  7. How to compare whether younger patients have better therapeutic results ?

    Hi, I've just finished a research on 30 patients. Age range was 26 to 80. I've tested everyone of them before and after the treatment. Results are...

    Started by nicck‎, 12-19-2015 09:16 AM
    • Replies: 1
    • Views: 933
    12-19-2015, 10:07 AM Go to last post
  8. 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: 2,046
    12-18-2015, 07:30 PM Go to last post
  9. Multiple testing?

    Hi all, I have a question about some analyses that I did. I examined a large hospital admissions data set and the data were grouped by areas 1, 2,...

    Started by wernie07‎, 12-17-2015 03:07 PM
    • Replies: 7
    • Views: 1,764
    12-18-2015, 10:54 AM Go to last post
  10. Exclamation Sample Size Selection

    Hi All I am having trouble with a sample size selection. I would like to run a study on the following applications to a program and record how many...

    Started by Bird1990‎, 12-12-2015 12:33 PM
    • Replies: 3
    • Views: 2,209
    12-12-2015, 09:28 PM Go to last post
  11. APA report format

    I have performed the Welch ANOVA due to the violation of homogeneity of variance. The df shown in spss is (2,164,078) Should I report this value,...

    Started by Nivv‎, 12-12-2015 08:21 AM
    • Replies: 0
    • Views: 1,118
    12-12-2015, 08:21 AM Go to last post
  12. [SAS] Compare predicted vs actual continuous [0,1] data

    Hello, I have predicted values for year and quarter that were calculated from a linear regression, and I also have actual values. I would like to...

    Started by kdk‎, 12-08-2015 05:13 PM
    actual values, comparison, predicted values, regression
    • Replies: 1
    • Views: 2,477
    12-08-2015, 08:01 PM Go to last post
  13. Violating the assumption of normality and homogeneity of variances. How to report?

    I am trying to run One way ANOVA but after trying to test these two assumptions, I found that the data violated the assumptions. I am now trying...

    Started by Nivv‎, 12-06-2015 06:43 AM
    • Replies: 2
    • Views: 2,452
    12-06-2015, 08:41 AM Go to last post
  14. structural zeros and chi square

    Hello, I have been reading a little bit about structural zeros and chi-square goodness of fit tests. I've not been able to find a clear answer...

    Started by wdmn‎, 12-05-2015 02:08 PM
    • Replies: 2
    • Views: 3,020
    12-05-2015, 03:48 PM Go to last post
  15. comparing models

    This might be a "101" question but hey, The Ecologist" encouraged me to ask questions , lots and lots of stupid questions. So when I have two...

    Started by bugman‎, 08-21-2015 12:14 AM
    • Replies: 7
    • Views: 2,516
    12-04-2015, 10:26 PM Go to last post
  16. 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: 2,232
    12-04-2015, 04:05 AM Go to last post
  17. 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: 2
    • Views: 1,719
    12-04-2015, 04:00 AM Go to last post
  18. disregard post, need 5 posts to pm someone

    Random stuff to get 5 posts

    Started by Jay Kenyon‎, 12-04-2015 02:22 AM
    • Replies: 2
    • Views: 1,066
    12-04-2015, 02:23 AM Go to last post
  19. correlation matrix: Bonferroni or not Bonferroni is my question

    Hello all, When constructing correlation matrices, a number of people claim that one should apply the Bonferroni adjustment if the number of...

    Started by andik‎, 12-02-2015 07:47 PM
    • Replies: 4
    • Views: 1,508
    12-03-2015, 08:50 PM Go to last post
  20. How to fix mistake of changing psychometric seven point scale to a five point scale?

    :shakeheadHi my first research project uses 3 psychometric scales which have all been peered reviewed as valid & reliable. I mistakenly thought it...

    Started by longpaddock‎, 07-15-2015 04:42 AM
    • Replies: 2
    • Views: 1,507
    12-03-2015, 11:35 AM Go to last post
  21. 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: 1
    • Views: 1,359
    12-01-2015, 08:55 PM Go to last post
  22. 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, 12-01-2015 03:13 AM
    • Replies: 1
    • Views: 1,418
    12-01-2015, 08:47 AM Go to last post
  23. [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: 1,396
    11-28-2015, 08:10 AM Go to last post
  24. 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: 1,559
    11-23-2015, 11:51 AM Go to last post
  25. 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: 960
    11-23-2015, 05:57 AM Go to last post
  26. 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: 1,401
    11-22-2015, 10:20 AM Go to last post
  27. 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: 3,001
    11-21-2015, 01:30 PM Go to last post
  28. 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: 1,565
    11-19-2015, 02:19 PM Go to last post
  29. 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: 1,155
    11-18-2015, 03:49 PM Go to last post
  30. 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: 1,368
    11-17-2015, 01:29 PM Go to last post
  31. 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: 744
    11-17-2015, 08:43 AM Go to last post
  32. 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: 1,041
    11-17-2015, 06:09 AM Go to last post
  33. 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: 1,413
    11-17-2015, 05:24 AM Go to last post
  34. 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: 0
    • Views: 1,585
    11-16-2015, 07:01 PM Go to last post
  35. 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: 11,227
    11-15-2015, 04:32 PM Go to last post
  36. 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: 1,395
    11-15-2015, 06:17 AM Go to last post
  37. 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: 992
    11-14-2015, 11:09 PM Go to last post
  38. 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: 2,031
    11-14-2015, 07:29 PM Go to last post
  39. 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: 1,302
    11-14-2015, 04:39 PM Go to last post
  40. 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: 839
    11-14-2015, 04:30 PM Go to last post
  41. 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: 1,691
    11-14-2015, 01:34 PM Go to last post
  42. 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: 1,731
    11-13-2015, 02:25 PM Go to last post
  43. 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: 1,207
    11-12-2015, 09:30 AM Go to last post
  44. 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: 5
    • Views: 1,931
    11-10-2015, 12:37 PM Go to last post
  45. 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 02:35 PM
    • Replies: 6
    • Views: 1,754
    11-09-2015, 06:36 PM Go to last post
  46. 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: 1
    • Views: 1,818
    11-09-2015, 11:56 AM Go to last post
  47. 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: 0
    • Views: 2,649
    11-08-2015, 07:27 AM Go to last post
  48. 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: 3
    • Views: 1,447
    11-06-2015, 06:33 PM Go to last post
  49. 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: 0
    • Views: 1,152
    11-05-2015, 05:52 AM Go to last post
  50. 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: 2
    • Views: 2,040
    11-04-2015, 12:07 PM Go to last post
  51. 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 08:01 AM
    • Replies: 0
    • Views: 1,353
    10-29-2015, 08:01 AM Go to last post
  52. 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 02:41 AM
    • Replies: 0
    • Views: 1,378
    10-29-2015, 02:41 AM Go to last post
  53. 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 05:32 PM
    • Replies: 3
    • Views: 1,778
    10-28-2015, 02:38 AM Go to last post
  54. 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 10:12 AM
    count data, kruskal-wallis, parasitology, poisson regression
    • Replies: 4
    • Views: 1,643
    10-27-2015, 05:28 PM Go to last post
  55. 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 01:39 AM
    • Replies: 1
    • Views: 2,146
    10-26-2015, 07:47 PM Go to last post
  56. 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 05:18 AM
    • Replies: 1
    • Views: 3,508
    10-24-2015, 07:52 AM Go to last post
  57. 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 02:47 PM
    • Replies: 8
    • Views: 2,134
    10-22-2015, 05:22 PM Go to last post
  58. 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 09:50 AM
    • Replies: 6
    • Views: 1,884
    10-22-2015, 03:23 PM Go to last post
  59. 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 02:25 PM
    • Replies: 4
    • Views: 1,793
    10-22-2015, 06:35 AM Go to last post
  60. 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: 1,075
    10-20-2015, 06:24 AM Go to last post

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