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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: 18,683
    10-11-2014, 12:02 PM Go to last post
  1. Need help defining terms for mixed model nested ANOVA

    Hello - I am looking at the effects of restoration practices on a suite of environmental soil parameters through time. I am having trouble defining...

    Started by AASSBB‎, 07-08-2012 05:09 PM
    mixed model anova, nested anova
    • Replies: 5
    • Views: 2,864
    07-16-2012, 04:59 PM Go to last post
  2. simple multivariate question

    I have, I think, a simple question about multivariate statistics, and I'm not sure which test (or even what kind of test does this). I have 40...

    Started by jbc165‎, 07-01-2012 02:24 PM
    multivariate, time series
    • Replies: 7
    • Views: 2,393
    07-16-2012, 03:46 PM Go to last post
  3. Trouble interpreting Fairlie's Decomposition Method in Stata

    Hi all, I am having trouble interpreting the fairlie decomposition method in Stata. I am interested in applying the procedure in identifying...

    Started by eemrun‎, 06-09-2012 10:06 AM
    • Replies: 1
    • Views: 5,133
    07-16-2012, 04:35 AM Go to last post
  4. Doubts analyzing Likert scales

    Hi all, I thought about analyzing results from Likert scale using Kruskal-Wallis, but the more I read about it, the more confused I get. People...

    Started by mprksc‎, 07-10-2012 01:41 PM
    • Replies: 3
    • Views: 4,513
    07-12-2012, 09:01 PM Go to last post
  5. Test of Significance advice needed

    I'm currently in high school doing my IB. I've been sifting through hundreds of CAT scans and x-rays that have been kindly donated to me by various...

    Started by SomeGuy‎, 06-20-2012 11:31 PM
    • Replies: 7
    • Views: 2,061
    07-12-2012, 07:48 PM Go to last post
  6. Unhappy Logistic regression question on outcome variable

    I have a large database with more than a million records. I would like to study the impact of several predictor variables (age, race, etc) on one...

    Started by Studentwest‎, 07-12-2012 07:08 PM
    binary variable, logistic regression
    • Replies: 0
    • Views: 1,551
    07-12-2012, 07:08 PM Go to last post
  7. Multiple t-tests versus ANOVA RM 2 way

    Hi there, A standard textbook comment when you read on performing multiple t-tests instead of doing an ANOVA study will say, "performing multiple...

    Started by thecupofcoffee‎, 07-08-2012 10:30 PM
    • Replies: 1
    • Views: 2,041
    07-12-2012, 01:08 PM Go to last post
  8. Fisher's Exact test significance, APA results phrasing

    My original post questions were answered offline. Thanks for allowing me to post!

    Started by Melanie‎, 07-10-2012 10:42 PM
    • Replies: 0
    • Views: 2,288
    07-10-2012, 10:42 PM Go to last post
  9. Kruskal Wallis test and problem with zeros

    Hi. I am conducting a biological research about species abundance variations between different hours and localitions. I am comparing 11...

    Started by sureño‎, 07-09-2012 07:19 PM
    kruskal wallis, non parametric, zeros
    • Replies: 0
    • Views: 3,038
    07-09-2012, 07:19 PM Go to last post
  10. manifold data/ cluster data

    what is the difference between manifold data/ cluster data??

    Started by sihem‎, 07-06-2012 12:28 PM
    data, data reduction
    • Replies: 0
    • Views: 1,459
    07-06-2012, 12:28 PM Go to last post
  11. STDEV at Different Means

    Im trying to measure 'consistency' in baseball scores amongst two different sample groups. For example, in a sample of 162 games each, one team...

    Started by agutts6‎, 07-01-2012 02:59 PM
    • Replies: 1
    • Views: 1,146
    07-06-2012, 11:36 AM Go to last post
  12. Rule Associations Help

    I apologize in advance if this is the wrong section. I'm trying to discover rule associations for a survey with over 140 attributes. All of the...

    Started by MattTC13‎, 07-05-2012 10:22 AM
    • Replies: 2
    • Views: 1,475
    07-05-2012, 10:49 AM Go to last post
  13. interaction between highly correlated variables possible?

    Dear all, maybe someone can help me. I ve read up on the interaction-topic, but I m confused. I have an interaction between a categorical and...

    Started by maria1‎, 07-04-2012 09:19 PM
    • Replies: 0
    • Views: 1,666
    07-04-2012, 09:19 PM Go to last post
  14. Smile research question

    easy (stupid?) question. for a small project, i had to write a research hypothesis and null hypothesis research hypothesis. the research...

    Started by vivident‎, 06-23-2012 05:18 PM
    • Replies: 1
    • Views: 1,401
    07-02-2012, 08:53 AM Go to last post
  15. Correlation of Distances

    I am trying to measure geometrical similarities of given two time-course data. Each of two time course data measures independently something changing...

    Started by Mostimportant‎, 07-02-2012 06:36 AM
    correlation, distance, dynamics
    • Replies: 0
    • Views: 1,472
    07-02-2012, 06:36 AM Go to last post
  16. how to control for firm performance ? (control variables) ?

    I'm doing a research on how the debt ratio affect firm performance dependent variable is ROA independent variable is debt ratio control variable...

    Started by Mareah‎, 07-01-2012 08:44 AM
    • Replies: 0
    • Views: 4,377
    07-01-2012, 08:44 AM Go to last post
  17. Post Looking for suggestions on proposed research questions

    Are my questions worded succinctly? Can you think of other information that could be gathered in order to determine whether CEO involvement...

    Started by ksylte‎, 06-28-2012 03:56 PM
    csr, kelly, phd, research questions, united way
    • Replies: 1
    • Views: 1,657
    06-29-2012, 08:46 PM Go to last post
  18. What kind of evaluation is appropriate for my project?

    I had a randomized clinical trial with two treatment groups and one control group, measurements at pre-test, post-post, for each of the three...

    Started by shiva‎, 06-29-2012 02:12 PM
    • Replies: 1
    • Views: 1,470
    06-29-2012, 02:46 PM Go to last post
  19. How robust is ANOVA's F-statistic?

    Hello there! I have theoretical question about the robustness of the F-statistic used in ANOVA when used on data that is negatively skewed. Many...

    Started by bimodal‎, 06-29-2012 12:28 PM
    • Replies: 3
    • Views: 3,198
    06-29-2012, 01:48 PM Go to last post
  20. dummy*continous interaction- sig. main effect, non-significant interaction

    Hi all, I would be grateful if someone could give me advice on the following topic: I estimated a glm and formed an interaction term out of a...

    Started by hazel‎, 06-28-2012 05:33 PM
    • Replies: 0
    • Views: 1,822
    06-28-2012, 05:33 PM Go to last post
  21. interpreting SS in permutational (M)ANOVA with adonis

    Dear all, I want to use the adonis() function in R package vegan to do a permutational univariate analysis of variance (instead of multivariate)...

    Started by pubert‎, 06-28-2012 10:46 AM
    • Replies: 0
    • Views: 2,730
    06-28-2012, 10:46 AM Go to last post
  22. Multiple comparison tests with no ANOVA

    Hiya, I've tried to find an answer to my question by searching the net but I can't find any clear solution. I want to compare the effect of...

    Started by hrj21‎, 06-26-2012 11:56 AM
    • Replies: 0
    • Views: 1,501
    06-26-2012, 11:56 AM Go to last post
  23. How to compare repeated measurements

    deleted and moved to biostatistics forum

    Started by med1234‎, 06-25-2012 01:50 PM
    • Replies: 0
    • Views: 1,367
    06-25-2012, 01:50 PM Go to last post
  24. Class interval identification problems!

    My data is transport cost (in percent) of 60 companies I decide to divide it into 5 classes (very good, good, moderate, poor, very poor) as the...

    Started by satha13‎, 06-24-2012 06:11 AM
    • Replies: 0
    • Views: 1,512
    06-24-2012, 06:11 AM Go to last post
  25. 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: 2,227
    06-24-2012, 01:16 AM Go to last post
  26. 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: 3,285
    06-22-2012, 06:37 PM Go to last post
  27. Multiple Group Analysis necessary?

    Hi, for my master's thesis I collected data with an online survey, measuring consumer behaviour. I used two samples, one group from Australia and...

    Started by robertz‎, 09-01-2010 06:15 AM
    • Replies: 13
    • Views: 16,182
    06-22-2012, 03:05 PM Go to last post
  28. Consistency in statistical tests

    Hiya, this is quite a basic question. I'm testing whether administration of a drug causes an increase in 7 different dependent variables. So my...

    Started by hrj21‎, 06-13-2012 08:53 AM
    • Replies: 1
    • Views: 4,040
    06-22-2012, 02:47 PM Go to last post
  29. Comparing confidence intervals: CI of mean vs CI of regression coefficient

    Hi, I have longitudinal data with measurements at two timepoints. I am interested in the change per year and calculated this in two ways: *...

    Started by confusedscientist‎, 06-22-2012 08:28 AM
    confidence interval, linear regression
    • Replies: 0
    • Views: 1,831
    06-22-2012, 08:28 AM Go to last post
  30. What type of sampling is this?

    Hi, I have some confusion about the kind of sampling I'm using. I started choosing manufacturing sector and within it chose 4 industries. Later I...

    Started by milehigh899‎, 06-21-2012 12:33 AM
    • Replies: 6
    • Views: 2,276
    06-21-2012, 10:30 PM Go to last post
  31. Red face Appropriate form of ANOVA when blocking

    Hi, I'm new to this forum (and relatively new to statistics) and have a question :) I have a text book that outlines the following experiment: ...

    Started by hrj21‎, 06-06-2012 07:08 AM
    • Replies: 3
    • Views: 1,640
    06-21-2012, 03:51 AM Go to last post
  32. does the following interaction make sense?

    Hello, I have a problem, it would be great if someone could help me with it. I m analyzing a sample of patients with eating disorders (anorexia ,...

    Started by hazel‎, 06-21-2012 01:12 AM
    • Replies: 0
    • Views: 1,346
    06-21-2012, 01:12 AM Go to last post
  33. Test of a given distribution against specified percentiles

    Hello all. Is there a way to conduct a test say, 5th, 95th percentiles, median, and quartiles against a parametric distribution (e.g. zero...

    Started by sampahmel‎, 06-17-2012 05:43 AM
    • Replies: 1
    • Views: 1,721
    06-20-2012, 05:16 PM Go to last post
  34. Statistical analysis for Rubric Based Research

    There are 26 participants who have participated in my research. Each participant treated with a lab module (Hands on Robotics Session). Now each...

    Started by jnrntr‎, 06-14-2012 11:06 PM
    chi square, hypothesis testing
    • Replies: 3
    • Views: 2,964
    06-17-2012, 08:48 PM Go to last post
  35. Combing Posterior Probability

    Does anyone know any methods that are used to combine two posterior probability obtained from different classifiers ?

    Started by poovich‎, 06-14-2012 01:06 AM
    • Replies: 1
    • Views: 1,630
    06-14-2012, 01:09 AM Go to last post
  36. 3 interdependent variables, parametric fit, loss for words

    I'm looking for a mathematical description of a data-set, but i have trouble finding the right wording. So i will just describe the situation. I...

    Started by Ivanana‎, 06-13-2012 05:29 PM
    • Replies: 0
    • Views: 2,374
    06-13-2012, 05:29 PM Go to last post
  37. Confidence interval for (Xbar-2*Ybar)

    Hi, Can any body help me to calculate confidence intervals for (Xbar-2*Ybar), where X and Y are two random variables. Is this as simple as (Xbar -...

    Started by ramakrishna‎, 06-13-2012 10:54 AM
    • Replies: 2
    • Views: 2,310
    06-13-2012, 11:06 AM Go to last post
  38. Plsr

    I know PLSR can deal with multiple dependent variables, how about if let say the 2 dependent variables are totally no relation at all, shall we do...

    Started by cheungr‎, 06-12-2012 11:11 AM
    • Replies: 2
    • Views: 1,505
    06-12-2012, 11:57 AM Go to last post
  39. Factor Analysis

    I plan designing a questionnaire. The fact is the questions asked involving nominal variables and open ended question. Can I proceed factor analysis...

    Started by ryan8200‎, 06-12-2012 02:32 AM
    • Replies: 0
    • Views: 1,154
    06-12-2012, 02:32 AM Go to last post
  40. Hypothesis Testing

    Hello , I have the following Null Hypotheses : There is no value grater than 20 If I have a population :...

    Started by medoos‎, 06-11-2012 06:28 PM
    hypothesis testing
    • Replies: 4
    • Views: 2,292
    06-11-2012, 06:49 PM Go to last post
  41. More measurements to reduce CV% in RIA?

    Hi, everyone! I got quite high CV% between many duplicates in my radio immunoassay experiment. I run the samples again and some results were much...

    Started by Nixa‎, 06-11-2012 08:15 AM
    • Replies: 0
    • Views: 2,938
    06-11-2012, 08:15 AM Go to last post
  42. Thumbs up Would you help me? (Tranformations)

    Hi, I was looking for tranformations for ratio data. I find that arcsine tranformation is adecuate for that kind of data (ratio). For that...

    Started by sureño‎, 05-07-2012 07:50 PM
    2 Pages
    1 2
    • Replies: 15
    • Views: 5,292
    06-06-2012, 09:07 AM Go to last post
  43. Smile Two stage least squares estimation

    Hello, I am a researcher in the sciences and trying to determine the validity or well-groundedness of a particular technique I see a lot. I am...

    Started by Panopticon‎, 06-05-2012 12:35 PM
    • Replies: 0
    • Views: 2,138
    06-05-2012, 12:35 PM Go to last post
  44. How to classify data into group?

    I have collected warehousing cost data from 200 companies...and then converted to % There are 200 data (lowest from 1.5 % to highest of 40 %). My...

    Started by satha13‎, 05-23-2012 07:19 AM
    • Replies: 5
    • Views: 3,838
    06-05-2012, 07:54 AM Go to last post
  45. Sample Selection

    My question is sample selection should base solely on sales OR maintain a balance between no. stores & sales so that city with slightly...

    Started by ryan8200‎, 05-29-2012 03:24 AM
    • Replies: 1
    • Views: 1,819
    06-04-2012, 08:37 PM Go to last post
  46. How does sampling reduce selection bias?

    Hi everyone, I'm struggling to understand theoretically how sampling reduces selection bias. Take the following example: Supposing there is a...

    Started by phil7686‎, 06-01-2012 03:37 PM
    sampling, selection bias
    • Replies: 1
    • Views: 5,115
    06-04-2012, 08:32 PM Go to last post
  47. Smile How to combine Probability Distribution Function of Two correlated variables?

    I have the probability distribution Functions(PDF) of the wind speeds of two wind sites which have a certain Pearson's correlation coefficient. How...

    Started by dinesh‎, 06-04-2012 05:21 PM
    convolution, correlation, dependent, probability distributions, regression
    • Replies: 0
    • Views: 2,743
    06-04-2012, 05:21 PM Go to last post
  48. Need help on SEM analysis using AMOS

    After defining my model when I run the analysis, it gives me a message that "The specified model is probably unidentified. In order to achieve...

    Started by arindam‎, 06-04-2012 05:13 AM
    • Replies: 1
    • Views: 13,356
    06-04-2012, 12:31 PM Go to last post
  49. Chi square test for ordinal variables

    Hey all, I have a question regarding the chi-square statistics. I have a total sample size of more than 4,000 and I have 2 groups (2 different...

    Started by proefkonijn‎, 06-02-2012 01:39 PM
    • Replies: 3
    • Views: 4,006
    06-03-2012, 04:38 AM Go to last post
  50. Regarding ANOVA for demographic variables

    Hi, In my research, i asked for demographic information related to age, marital status etc. Also, I collected information for who takes buying...

    Started by princess81‎, 06-02-2012 03:17 AM
    • Replies: 0
    • Views: 2,314
    06-02-2012, 03:17 AM Go to last post
  51. Red face Could anyone recommend an interactive application for mass data analysis?

    Hi, everybody I need to conduct a large amount of data analysis on database. Could anyone recommend an interactive application for data analysis?...

    Started by bestbird7788‎, 05-22-2012 02:53 AM
    analysis, database, interactive, mass data, sql
    • Replies: 13
    • Views: 3,102
    05-31-2012, 09:25 PM Go to last post
  52. Question Correlations between groups of Likert-type answers – choice of statistical test

    I'm looking for the optimal way to interpret some data, so any constructive advice will be appreciated. A questionnaire with 3 groups of 50...

    Started by ajvar‎, 05-31-2012 03:41 PM
    correlation, likert, test
    • Replies: 1
    • Views: 41,277
    05-31-2012, 05:02 PM Go to last post
  53. Easy Standardization Question

    Hello everyone, I have a hopefully solveable question, however, I would like to get your opinion on it, as I am not 100% sure. I have a dataset...

    Started by Absolutlyclueless‎, 05-30-2012 04:15 AM
    • Replies: 0
    • Views: 1,316
    05-30-2012, 04:15 AM Go to last post
  54. GARCH fitting to binary data / latent data

    Dear all I am trying to fit a simple ARCH(1)/GARCH(1,1) model to a set of binary data, i.e. I assume a latent GARCH process that is only observed...

    Started by ARDE‎, 05-30-2012 03:19 AM
    • Replies: 0
    • Views: 2,014
    05-30-2012, 03:19 AM Go to last post
  55. What is the point of providing p-values for baseline characterisitics?

    I just have a general question about what the point is of have baseline characteristics and then presenting p-values for these. Is the p-value...

    Started by chiccaboom‎, 05-01-2012 11:19 PM
    • Replies: 3
    • Views: 8,268
    05-29-2012, 02:13 PM Go to last post
  56. comparison of Exponential distribution and Lognormal Distribution parameters

    Hi everyone! I have 30 days worth of data. Each day, I have a set of interarrival times. I wanted to find out the distribution of the arrivals, so...

    Started by whattodo‎, 05-29-2012 07:07 AM
    • Replies: 0
    • Views: 3,634
    05-29-2012, 07:07 AM Go to last post
  57. Student -T with big sample

    If the population variance is unknown and the sample size is >30, can I proceed to use Student-T to compute confidence interval ? or I have to use ...

    Started by ryan8200‎, 05-25-2012 04:22 AM
    • Replies: 7
    • Views: 2,377
    05-28-2012, 02:04 AM Go to last post
  58. Stratified Random Sampling

    If the population size for each stratum is unknown and cannot be measured ? Can I still utilize this sampling procedure ? How to estimate the...

    Started by ryan8200‎, 05-07-2012 02:35 AM
    • Replies: 4
    • Views: 2,572
    05-27-2012, 10:18 PM Go to last post
  59. PLS-DA: Are latent variables comparative?

    Hello, first post on the forum - hopefully this is the correct place to do this. I've been working on developing an system for visualising the...

    Started by martinfitzp‎, 05-25-2012 05:30 AM
    • Replies: 2
    • Views: 3,439
    05-27-2012, 07:40 PM Go to last post
  60. how to interpret interactions when one variable is in a log scale?

    Hi there, I have a significant interaction in the model and was wondering how to interpret the coefficient given that one original effect is in a log...

    Started by SylviaS‎, 05-26-2012 12:16 PM
    • Replies: 1
    • Views: 1,334
    05-27-2012, 02:42 AM Go to last post

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