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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: 18,799
    10-11-2014, 12:02 PM Go to last post
  1. 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: 3,463
    05-27-2012, 07:40 PM Go to last post
  2. 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: 1,355
    05-27-2012, 02:42 AM Go to last post
  3. how to interpret 2log(x)?

    I have coefficient B for 2 log(x) and was wondering how to interpret it. In this case B=1.9. Thank you for your help.

    Started by SylviaS‎, 05-26-2012 10:34 AM
    • Replies: 2
    • Views: 1,908
    05-26-2012, 11:44 AM Go to last post
  4. does it make sense to square log(x)?

    log(x) and 2log(x) in the model, log(x) is authomatically getting dropped from the model because of collinearity. Is it ok, or do I need to keep the...

    Started by SylviaS‎, 05-26-2012 09:39 AM
    • Replies: 0
    • Views: 1,157
    05-26-2012, 09:39 AM Go to last post
  5. Spatial Statistics

    Hi guys, I'd like to ask for your feedback regarding appropriate statistical distances/information distances, etc on the following matter: Let's...

    Started by secondrate‎, 05-26-2012 01:52 AM
    • Replies: 0
    • Views: 980
    05-26-2012, 01:52 AM Go to last post
  6. Correlations between twins - who is X and wo is Y?

    I have some data on twins (all fraternal) and I'm trying to see if there is any correlation between them on several measures (e.g., body...

    Started by andrewkent‎, 05-24-2012 02:50 PM
    correlation, twin studies, twins
    • Replies: 7
    • Views: 2,705
    05-24-2012, 04:33 PM Go to last post
  7. Statistical methods to determine the proportion to min. value of depandant variable

    I am new to this forum, but heard alot about it from my classmates. I am basically doing an internship in a company. The company is using various...

    Started by manishkalonia85‎, 05-24-2012 01:44 PM
    minimization, statistical methods
    • Replies: 0
    • Views: 1,835
    05-24-2012, 01:44 PM Go to last post
  8. Question Best suited forecasting method for forecasting of sales of truck/tractors?

    Best suited forecasting method for forecasting of sales of truck/tractors? The constraints for forecasting are 1.The sale figures of trucks do not...

    Started by Wordsworth‎, 05-23-2012 10:06 AM
    • Replies: 0
    • Views: 1,224
    05-23-2012, 10:06 AM Go to last post
  9. Comparing categorical data with 2 independent variables

    Hi All, I'm a student researcher and am needing some statistical advice. I stumbled upon a post regarding a similar problem at this site, so I'll...

    Started by f344‎, 05-22-2012 09:12 AM
    • Replies: 0
    • Views: 1,419
    05-22-2012, 09:12 AM Go to last post
  10. Comparing two groups responses to a 5 question likert questionnaire

    I'm analyzing a likert questionnaire to determine if respondent's answered questions differently based on whether they compete frequently or...

    Started by aduray‎, 05-21-2012 09:34 PM
    • Replies: 5
    • Views: 4,477
    05-21-2012, 11:08 PM Go to last post
  11. Comparing distributions

    I'm working on analyzing data for a prof for publication and have come to a situation that I am lacking confidence in and am coming here for help. ...

    Started by trinker‎, 03-02-2012 03:54 PM
    • Replies: 12
    • Views: 3,951
    05-21-2012, 10:28 AM Go to last post
  12. help in Real survey data analysis‏

    would you please guide me to analyze it? i will tell u overall view of the questionnaire and goals and hope to help me how to analyze it the...

    Started by kormbo2002‎, 05-19-2012 02:36 PM
    • Replies: 2
    • Views: 40,914
    05-19-2012, 03:47 PM Go to last post
  13. Binary logistic regression with no significant predictors

    Hi everyone, I have a question for logistic regression but i guess it applies to all kinds of regression analysis. I have a model with many...

    Started by micdhack‎, 05-11-2012 06:16 AM
    • Replies: 3
    • Views: 11,255
    05-19-2012, 06:43 AM Go to last post
  14. Reliability of the results

    We recently conducted a research for one of our client's ad effectiveness campaign. We had asked questions to a control group who were not exposed to...

    Started by pandyav‎, 05-17-2012 01:02 PM
    • Replies: 1
    • Views: 1,527
    05-17-2012, 05:16 PM Go to last post
  15. Divergent results - RMANOVA vs. paired samples t-tests

    Hi there, I'm analyzing a dataset (a pre - post intervention), where I have a baseline and 2 post-intervention time points. If I perform a RMANOVA...

    Started by Virconrui‎, 05-15-2012 08:50 AM
    paired samples t-test, repeated measures anova
    • Replies: 0
    • Views: 2,092
    05-15-2012, 08:50 AM Go to last post
  16. Suggested form of statistical analysis?

    I appreciate the feedback so far. Now, I'm wondering what type of statistical analysis I CAN do with a large amount of data that is pretty important...

    Started by amyleva‎, 05-11-2012 09:17 AM
    anova, paired t
    • Replies: 6
    • Views: 1,587
    05-15-2012, 02:14 AM Go to last post
  17. one way anova

    I'm currently doing a project and not sure what stat test to use. I did a population density experiment with manduca sexta. There were 3 densities...

    Started by tonyr1512‎, 05-12-2012 02:11 PM
    • Replies: 1
    • Views: 1,123
    05-14-2012, 09:42 AM Go to last post
  18. Comparing two overlapping samples in a tracking study

    I have a quick query about measures of sample accuracy in a tracking study with an overlapping (common) sample, and couldn't see anything here...

    Started by batfastard‎, 05-14-2012 01:19 AM
    comparing two samples
    • Replies: 0
    • Views: 1,378
    05-14-2012, 01:19 AM Go to last post
  19. kaplan-meier from a survival function

    hi, let assume I have a survival function, given as a solution from a continuous model. To be precise, the cumulative hazard is calculated, Ch(t),...

    Started by fuzzyswat‎, 05-11-2012 12:16 PM
    hazard, survival
    • Replies: 0
    • Views: 1,649
    05-11-2012, 12:16 PM Go to last post
  20. Bayesian t-test

    Hello I tried looking for a simple explanation with an example of how to perform a procedure that will be equivalent to the t-test using Bayesian...

    Started by NN_STAT‎, 05-08-2012 02:07 AM
    • Replies: 4
    • Views: 4,203
    05-11-2012, 06:11 AM Go to last post
  21. Boxplot

    Hi All, Can someone please help me to clearly explain this box plot in the attached file ? Thanks in advance

    Started by Sisi‎, 05-07-2012 04:01 AM
    • Replies: 3
    • Views: 1,445
    05-09-2012, 03:33 PM Go to last post
  22. Bayesian approach to comparing parameters of two distributions

    This is my first post here, and I'm hoping that someone can help me with a stats problem. I don't have much formal training, but I'll do my best to...

    Started by zipp83‎, 05-09-2012 02:27 AM
    • Replies: 4
    • Views: 3,027
    05-09-2012, 02:20 PM Go to last post
  23. What does "local" mean?

    This seems like a very basic question: In a recent working paper I am writing a report on, the authors propose a test that is "locally...

    Started by carlfriedrich‎, 05-09-2012 01:37 AM
    • Replies: 0
    • Views: 1,338
    05-09-2012, 01:37 AM Go to last post
  24. Chi-square iinterpretation research project

    Hi Folks, For my uni research I'm doing a chi-square analysis. Basically what I'm comparing are 2 different medication groups. I'm comparing these...

    Started by marcel1‎, 04-26-2012 10:06 AM
    • Replies: 2
    • Views: 1,175
    05-07-2012, 04:15 PM Go to last post
  25. Help in result interpretation

    Hi All, I analysed a data set using descriptive analysis and I need someone to please help me interprete the results. Below is the result...

    Started by Sisi‎, 05-07-2012 03:53 AM
    • Replies: 0
    • Views: 987
    05-07-2012, 03:53 AM Go to last post
  26. Exclamation Problem with allocating data

    Hello, Im currently writing my bachelor thesis in statistical finance and i have run into a small problem. I want to evaluate forcasts from my...

    Started by oswi3605‎, 04-25-2012 05:15 AM
    data, financial, garch, rsoftware, stock
    • Replies: 3
    • Views: 1,873
    05-07-2012, 03:11 AM Go to last post
  27. detect mean and variance shifts

    from the plotted figure, how i can distinguish what i have to monitor mean or variance to detect a shift from the process

    Started by sihem‎, 05-06-2012 03:52 PM
    • Replies: 2
    • Views: 1,604
    05-06-2012, 04:25 PM Go to last post
  28. Question results SIMPER dissimilarity for species with equal mean abundance

    Dear all, I am doing my master thesis on subtidal algae species in the north Atlantic. Herefore I have presence-absence data of different algae...

    Started by sofia‎, 05-04-2012 08:45 AM
    • Replies: 1
    • Views: 6,077
    05-04-2012, 09:08 PM Go to last post
  29. pairwise test PERMANOVA does not give t and p values for some comparisons

    Dear All, Another question that me and my collegues/ professors cant answer, and maybe one of you can give some ideas. some introduction: I am...

    Started by sofia‎, 05-04-2012 09:12 AM
    • Replies: 1
    • Views: 7,353
    05-04-2012, 09:05 PM Go to last post
  30. presenting results of simple correlations and multiple regressions in the same paper

    I recently got comments back from a reviewer on a manuscript, criticizing my use of simple correlation and multiple regression analyses to study the...

    Started by l3a9k‎, 05-03-2012 12:31 PM
    • Replies: 2
    • Views: 3,150
    05-04-2012, 07:55 AM Go to last post
  31. Where to find data (morning running vs evening running)?

    Hi, I am trying to do some analysis on running time: morning vs evening. Does anyone know where I can find data? Thanks in advance. John

    Started by john2012‎, 05-02-2012 10:29 AM
    • Replies: 9
    • Views: 2,710
    05-02-2012, 05:42 PM Go to last post
  32. Groups split /Low and High

    HI ALL, I would like to ask about the best and accurate way to dividing groups as low and high. And how I can conducted this analysis using the...

    Started by ghada8888‎, 05-02-2012 09:19 AM
    • Replies: 0
    • Views: 1,065
    05-02-2012, 09:19 AM Go to last post
  33. Inclusion criteria of participants and internval validity

    Hi All, I am having trouble understanding how the inclusion criteria of participants can affect the internal validity of a study. This is my...

    Started by chiccaboom‎, 05-02-2012 02:11 AM
    • Replies: 1
    • Views: 26,179
    05-02-2012, 07:15 AM Go to last post
  34. Correlation between two dependent variables on repeated measures

    Hello there! I am trying to see if there is covariation of two variables (anxiety and sleeping heart rate) over multiple days of testing the same...

    Started by Major‎, 03-10-2012 08:54 PM
    repeated measures
    • Replies: 2
    • Views: 10,193
    05-02-2012, 06:13 AM Go to last post
  35. Help with comparing very small proportions

    I have a problem with comparing some proportions. I am looking at interactions between sequences in a genome and I want to compare the numbers of...

    Started by mousme‎, 05-02-2012 03:45 AM
    • Replies: 0
    • Views: 1,396
    05-02-2012, 03:45 AM Go to last post
  36. Time Series Dummy Variable and Time Trend

    Hi, I currently have some research going on that requires me to put in a time trend variable t = {1,2,3,4,.....,N} where N is the total number of...

    Started by dannylimstata‎, 05-01-2012 11:55 PM
    • Replies: 1
    • Views: 5,234
    05-02-2012, 12:04 AM Go to last post
  37. Exclamation desperate for some help with a confidence interval question.

    please delete thread

    Started by djani‎, 04-30-2012 08:30 AM
    • Replies: 0
    • Views: 1,563
    04-30-2012, 08:30 AM Go to last post
  38. Bayesian confuson

    Hi, I am trying to reconcile what I think are conflicting philosophies in my head about an experiment. The experiment is a hierarchical model...

    Started by Panopticon‎, 04-29-2012 10:02 PM
    • Replies: 2
    • Views: 1,591
    04-29-2012, 10:30 PM Go to last post
  39. Need assistance to conduct a validation of research instrument

    I'm completing a PhD degree and need help from five PhD holders in order to conduct an instrument validation (face value and content validation). The...

    Started by Aldus‎, 04-29-2012 06:48 PM
    instrument validation, validity, validity testing
    • Replies: 0
    • Views: 1,740
    04-29-2012, 06:48 PM Go to last post
  40. Need Help on Hypothesis testing

    Need help in understanding whether the method i am adopting is correct or not and what other tests i can include. I have a sample size of 720...

    Started by chintan‎, 04-29-2012 04:34 PM
    • Replies: 0
    • Views: 987
    04-29-2012, 04:34 PM Go to last post
  41. Optimal tests of hypothesis

    I have a question about the use of optimal tests of hypothesis in practice. Are they often used in research or in industry? I understand that UMP...

    Started by BrownianMan‎, 04-26-2012 10:49 PM
    • Replies: 2
    • Views: 2,187
    04-28-2012, 12:06 AM Go to last post
  42. Determining which data set is most like another

    I am new to this forum - so let me apologize in advance if this is the wrong location. Given a specific multivariate data set, and numerous other...

    Started by EMStelley‎, 04-26-2012 12:23 PM
    chi-squared, multivariate data sets
    • Replies: 6
    • Views: 1,757
    04-27-2012, 02:08 PM Go to last post
  43. Estimating a pdf from binomial trials - point me in the right direction?

    Hi, I'm afraid I'm not an expert in statistics, but I have a particular problem I'm interested in solving. I'm pretty sure this area already has a...

    Started by Stereotomy‎, 04-23-2012 08:24 PM
    bernoulli, binomial, estimation, inference, parameterless
    • Replies: 3
    • Views: 1,481
    04-27-2012, 12:34 PM Go to last post
  44. Which test for multiple interventions?

    Hi Just a quick question re: which test would be best for the following scenario Three interventions, one control. Participants provided...

    Started by mulligan1985‎, 04-26-2012 09:48 PM
    • Replies: 0
    • Views: 1,122
    04-26-2012, 09:48 PM Go to last post
  45. Choosing a proper statistical test

    Hi! I want to perform a statistical test, but I'm not sure which one I should use. Please note that this is a hypothetical example so I will not...

    Started by grandpa‎, 04-26-2012 07:28 AM
    • Replies: 1
    • Views: 1,511
    04-26-2012, 03:22 PM Go to last post
  46. PCA of landmark data

    Hi all, I am trying to analyse wing shape using PCA. I have used a morphometric approach and have coordinates of 20 landmarks for 60 different...

    Started by RJoness‎, 04-26-2012 10:49 AM
    • Replies: 0
    • Views: 1,963
    04-26-2012, 10:49 AM Go to last post
  47. Nonparametric tests for serial correlation

    Hello, Can anyone recommend a non-parametric test for serial correlation in a time series? Also, if the test is available in matlab? Thank you...

    Started by LostInNY‎, 04-24-2012 10:40 AM
    • Replies: 0
    • Views: 1,744
    04-24-2012, 10:40 AM Go to last post
  48. Fisher's exact test, Hypergeometric distribution

    Hi, I need some help with Fisher's exact test and the hypergeometric distribution My data consists of: 500 mutations - that I want to score as...

    Started by AnnaS‎, 04-24-2012 08:19 AM
    fisher's exact test, hypergeometric
    • Replies: 0
    • Views: 3,466
    04-24-2012, 08:19 AM Go to last post
  49. Research using Fisher's Exact Test

    I'm writing a paper based on published, stats data. I'm looking for a real research example of where Fisher's exact test is used on an extremely low...

    Started by bassnectar‎, 04-23-2012 09:10 PM
    • Replies: 0
    • Views: 2,331
    04-23-2012, 09:10 PM Go to last post
  50. How do you convert yearly and period CPI to that of a rolling basis?

    Hi Guys, I am doing research and currently I am trying to utilize Consumer Price Index data. I have two sets of consumer price data, one that...

    Started by dannylimstata‎, 04-23-2012 04:35 AM
    • Replies: 0
    • Views: 1,037
    04-23-2012, 04:35 AM Go to last post
  51. Categorical vs Ordinal data analysis

    I have a question regarding some data analysis I am conducting. I'm trying to find significance and degree/direction of association between two...

    Started by MiltonF‎, 09-14-2010 10:15 PM
    • Replies: 3
    • Views: 10,819
    04-22-2012, 12:41 PM Go to last post
  52. Sports Forecasting - a million iterations

    Hello, I am working on a forecasting project and would like to create a script that automates the following steps: order data by X characteristic...

    Started by bscully‎, 04-21-2012 10:18 AM
    forecasting, iteration, nfl, script, sports
    • Replies: 0
    • Views: 1,218
    04-21-2012, 10:18 AM Go to last post
  53. simultaneous equations

    hi guys, i need help regarding simultaneous equations. for the following simultaneous equations: R=b1+b2*Q+errorterm2...

    Started by little_stats‎, 04-17-2012 05:05 PM
    • Replies: 8
    • Views: 1,989
    04-21-2012, 08:48 AM Go to last post
  54. T-test puzzlement

    I've been pondering on this for some time and I guess i'm confused because there are so many stats tests out there. Basically my aim is to figure...

    Started by nom‎, 04-19-2012 09:42 PM
    statistically significant, t-test
    • Replies: 2
    • Views: 1,658
    04-20-2012, 11:43 AM Go to last post
  55. directional stats: combination of von Mises distributions

    Dear Stats-Experts: I am at loss in my research project and would appreciate any input, reference to literature, publications, etc. Here it goes:...

    Started by tuco‎, 04-18-2012 09:33 PM
    combination, directional statistics, von mises
    • Replies: 0
    • Views: 1,543
    04-18-2012, 09:33 PM Go to last post
  56. Bayesian updating or...?

    Hi There, I'm new to this forum and also not an experienced statistician but I have a question. In my research I'm facing a problem that...

    Started by Bas van Dijk‎, 04-18-2012 10:18 AM
    • Replies: 0
    • Views: 1,283
    04-18-2012, 10:18 AM Go to last post
  57. Variance Of Expression

    Hi, maybe somebody can help me with finding variance of expression that shown in attached pdf file. Thanks, Michael

    Started by Michael123‎, 04-17-2012 09:07 AM
    • Replies: 2
    • Views: 1,911
    04-18-2012, 01:04 AM Go to last post
  58. How to test this kind statistical hypothesis ?

    Hey. How can I test H_{0} \: : \;\;\; \frac{\mu_{1} + \mu_{3}}{2}=\mu_{2}?

    Started by pajacek‎, 04-15-2012 04:48 AM
    • Replies: 3
    • Views: 1,879
    04-15-2012, 09:59 AM Go to last post
  59. Post Beginner Statistics for Repeatability/Reproducibility

    Hi all, I'm new to this forum and seeking help regarding stats for a research project. My stats background is minimal (one college level class)...

    Started by microbegirl77‎, 04-12-2012 08:50 PM
    • Replies: 0
    • Views: 1,038
    04-12-2012, 08:50 PM Go to last post
  60. Goodness of fit for 2D histograms

    Hello all, I've dragging this problem for quite a while now and I'd really appreciate it if someone could help me whit it. I have two sets of...

    Started by Gaba‎, 04-11-2012 07:11 AM
    goodness of fit, histogram, model validation
    • Replies: 0
    • Views: 1,719
    04-11-2012, 07:11 AM Go to last post

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