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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: 18,712
    10-11-2014, 12:02 PM Go to last post
  1. Likelihood Ratio Test for general hypotheses

    Hi, The original paper (Wilks, 1938) describing the Likelihood Ratio Test considers a null hypothesis stating that a subset of the parameters from...

    Started by dfirka‎, 02-14-2011 01:29 PM
    likelihood ratio test
    • Replies: 2
    • Views: 5,905
    02-17-2011, 07:54 AM Go to last post
  2. What statistical test should I use to check to ratio?

    I have data for two sets of sample in the form of frequency of three category.Say A,B & C are three category and I have data for sample 1 as ...

    Started by ch.niladri‎, 02-09-2011 01:21 AM
    • Replies: 6
    • Views: 14,894
    02-16-2011, 01:37 PM Go to last post
  3. whether opinion differes among respondents from different group

    I want to test whether response differ among groups regarding e-government interoperability. There are 14 itens regarding interoperability (Likert...

    Started by dibakar‎, 01-17-2011 02:41 AM
    • Replies: 1
    • Views: 2,283
    02-16-2011, 03:26 AM Go to last post
  4. Research Design

    Hi there, i'm wondering if you guys could guide me a bit with my plans. Basically im intrested in looking at paranoid ideation (thr presence of...

    Started by blue2‎, 10-28-2010 04:48 PM
    • Replies: 9
    • Views: 4,007
    02-15-2011, 09:15 PM Go to last post
  5. Likert scale analysis

    Hi all! I want to ask that i have likert scale questionnaire with 6 points scale. If i am going to analyze using as interval data, that means i have...

    Started by hepymoon‎, 02-15-2011 08:13 AM
    • Replies: 0
    • Views: 3,931
    02-15-2011, 08:13 AM Go to last post
  6. Biology grad student needs help - Scorpion Data

    Hello, I am looking for help with PCA, and stuff like DFA and MANOVA. I study scorpions, and as part of my research I have used genetic methods...

    Started by mattrgraham‎, 02-14-2011 10:24 PM
    • Replies: 1
    • Views: 2,975
    02-15-2011, 04:11 AM Go to last post
  7. Model Averaging

    I am doing a project in school and the guideline suggests using Bayesian Model Averaging which is just a formula to determine the model weight. I...

    Started by poilkjmnbth‎, 02-14-2011 11:14 PM
    • Replies: 0
    • Views: 1,776
    02-14-2011, 11:14 PM Go to last post
  8. Repeated measures ANOVA + multiple comparisons corrections

    Hello everybody, I had a question in regards to ANOVAs and multiple comparisons corrections (Bonferroni mostly). I am running a 3 way repeated...

    Started by rohanp16‎, 02-13-2011 09:12 PM
    • Replies: 0
    • Views: 2,785
    02-13-2011, 09:12 PM Go to last post
  9. inferences on deterministic models

    Hello, Please let me know if I am posting in the wrong place. Thanks I am working on a project where I have a mathematical epidemic model and I...

    Started by LHoward‎, 02-13-2011 09:36 AM
    deterministic, epidemic, model, stochastic
    • Replies: 0
    • Views: 2,129
    02-13-2011, 09:36 AM Go to last post
  10. Which test to run (pretest-posttest)

    Hi there! What is the best test to use to analyze data involving a pretest and posttest given to two different treatment groups? Thanks!

    Started by Brandi‎, 02-10-2011 02:01 PM
    • Replies: 10
    • Views: 7,524
    02-11-2011, 10:46 PM Go to last post
  11. Question Normality analysis

    hye guys... i need a help.. Can someone show me how to run the normality analysis... In my questionnaires, I have 4 independent variables and...

    Started by ryan88‎, 01-26-2011 11:08 AM
    • Replies: 7
    • Views: 3,162
    02-09-2011, 06:58 PM Go to last post
  12. Calibration for COX model

    Hi everyone, I'm looking for the methodology to compute the calibration of the COX model with time-dependent, I found few articles on the net...

    Started by nedjarh‎, 02-09-2011 09:47 AM
    • Replies: 0
    • Views: 3,332
    02-09-2011, 09:47 AM Go to last post
  13. Normalizing the distribution of time data

    Hello everybody, i have time data from a test that was conducted online. Basically the time that took for every user to complete each page of the...

    Started by micdhack‎, 02-09-2011 08:03 AM
    • Replies: 0
    • Views: 3,343
    02-09-2011, 08:03 AM Go to last post
  14. What statistical test should I use?

    I have created high and low variables from 1 variable. I want to see whether the mean of the "high" subjects differs from the mean of the "low"...

    Started by lilchicken‎, 02-09-2011 12:46 AM
    • Replies: 4
    • Views: 2,823
    02-09-2011, 05:19 AM Go to last post
  15. Exclamation Which test to use for Qualitative study? Power analysis?

    For a qualitative study that only involves structured interviews which test is appropriate for analyzing the data? Also, how do I do a power analysis...

    Started by sarahfiedler‎, 02-07-2011 08:25 PM
    • Replies: 1
    • Views: 9,553
    02-08-2011, 05:04 AM Go to last post
  16. Sunfish NMDS/PERMANOVA in reverse

    I have extensive habitat data for four sunfish species, and I would like to determine if (statistically) they partition habitats to reduce...

    Started by sms16‎, 02-07-2011 02:02 PM
    permanova nmds sunfish
    • Replies: 3
    • Views: 4,516
    02-08-2011, 12:41 AM Go to last post
  17. Red face DF in Repeated Measures ANOVA

    Hi all! :wave: In advance: thank you to all those who take the time to even read this post, as well as answer it: Additional to my sunfish study...

    Started by sms16‎, 02-08-2011 12:23 AM
    degrees of feedom, proc mixed, sas
    • Replies: 0
    • Views: 4,683
    02-08-2011, 12:23 AM Go to last post
  18. interaction

    I have found a model to be significant for the effect of 4 IVs (two continuous and two dichotomous) on a continuous DV but none of the IVs show...

    Started by Deirdre‎, 01-18-2011 09:13 AM
    • Replies: 2
    • Views: 2,874
    02-07-2011, 10:17 PM Go to last post
  19. Optimal combination of conditions

    I am looking to find an efficient process to determine the set of conditions that results in the optimal likelihood of accomplishing some task. ...

    Started by haz33‎, 02-03-2011 04:30 PM
    • Replies: 12
    • Views: 4,384
    02-06-2011, 02:55 PM Go to last post
  20. Checking if Critical Point Max or Min or Saddle

    How can I check if a critical point (x1,x2,...x10) for a function of 10 variables is a minimum or maximum or saddle? There is a lot of...

    Started by Valen‎, 02-04-2011 05:42 PM
    • Replies: 0
    • Views: 3,640
    02-04-2011, 05:42 PM Go to last post
  21. Help with quick but major statistical school project!

    only two questions, wont take long... would really apprechiate some replys The pool can be found here: http://www.misterpoll.com/polls/515408 ...

    Started by krisolskro‎, 02-04-2011 03:05 PM
    • Replies: 0
    • Views: 3,121
    02-04-2011, 03:05 PM Go to last post
  22. Sum of the residuals

    Hi, My question may sound trivial but here it goes: When doing a sample regression by the ordinary least squares method, does the sum (nonsquared!...

    Started by val92‎, 02-04-2011 12:49 PM
    • Replies: 2
    • Views: 50,581
    02-04-2011, 01:40 PM Go to last post
  23. strengths and weaknesses of unpaired t-test

    I would like to find out the strengths and weaknesses of using an unpaired t-test for testing for the difference in means

    Started by andrew03‎, 02-03-2011 04:40 PM
    • Replies: 1
    • Views: 9,609
    02-03-2011, 10:12 PM Go to last post
  24. strengths and weaknesses of Chi squared

    I would like to find out the strengths and weaknesses of using a chi squared test for goodness of fit testing

    Started by andrew03‎, 02-03-2011 04:35 PM
    • Replies: 0
    • Views: 7,611
    02-03-2011, 04:35 PM Go to last post
  25. number of distinct samples in sampling with replacement

    If I have a set (X1, X2,X3) and I want to re-sample them with replacement, the possible combinations of the samples are (the order doesn't matter):...

    Started by zzzc‎, 02-01-2011 06:58 PM
    • Replies: 0
    • Views: 3,610
    02-01-2011, 06:58 PM Go to last post
  26. Permanova - Adonis

    Hi!, :wave: I want to use Adonis in R (non-parametric permutation MANOVA) to test for relationships between bray-curtis distances (dissimilarities I...

    Started by spiderlady‎, 01-27-2011 08:57 PM
    • Replies: 5
    • Views: 19,858
    02-01-2011, 04:52 AM Go to last post
  27. ANOVA of factor analysis results

    Hello, new to the forum, and I'm in a bit of a bind with some data analysis for my thesis. I have conducted Principle Axis Factoring (using SPSS,...

    Started by dalsauks‎, 02-01-2011 12:39 AM
    • Replies: 0
    • Views: 3,758
    02-01-2011, 12:39 AM Go to last post
  28. Question Analyzing Customer Satisfaction Indexes

    Hello, I work for a company and we recently started to measure our customer satisfaction index. We chose the sample size based on a well-known...

    Started by rafael_josem‎, 01-31-2011 01:06 PM
    • Replies: 1
    • Views: 1,882
    01-31-2011, 01:09 PM Go to last post
  29. Which Anova to use???

    Okay. So I've read tons of books on this and none of them seem to give me a clear answer so here goes. I have 40 subjects. Each will be randomly...

    Started by kyle_genner‎, 01-15-2011 01:20 PM
    • Replies: 2
    • Views: 4,562
    01-31-2011, 03:01 AM Go to last post
  30. On the history of MANOVA's null hypothesis...

    hey everyone! this is kind of a different topic from the "how-to-analyze-my-data" questions, but i think it's kind of relevant. anyways, so my...

    Started by spunky‎, 01-30-2011 09:15 PM
    manova, multivariate analysis, null hypothesis
    • Replies: 0
    • Views: 3,737
    01-30-2011, 09:15 PM Go to last post
  31. Interpretation of Factor Analysis

    I have a doubt on how to interpret the factor score output? Suppose we have data in 7 columns: Recommendation, Preference, Willingness to pay...

    Started by bsaikrishna‎, 01-30-2011 08:46 AM
    • Replies: 0
    • Views: 3,764
    01-30-2011, 08:46 AM Go to last post
  32. Manova

    Hi, I need help with MANOVA analysis. I'm wondering which post hoc test you can use after MANOVA shows stat. difference in data. I have 4 groups...

    Started by orcagna‎, 01-29-2011 01:05 PM
    • Replies: 0
    • Views: 2,544
    01-29-2011, 01:05 PM Go to last post
  33. Power analysis 1-sided vs 2-sided

    I'm curious how power analysis changes when you go from a 2-sided test to a 1-sided test. If in both cases I keep my alpha at .05, my effect size and...

    Started by biostatsmia‎, 01-27-2011 04:20 PM
    • Replies: 0
    • Views: 3,713
    01-27-2011, 04:20 PM Go to last post
  34. testing problem

    Let X has one of the following probability distributions: H_0:P(X=0)=P(X=\frac{1}{2})=P(X=1)=\frac{1}{3} and H_1:X is continuous and...

    Started by Sambit‎, 01-26-2011 11:26 PM
    • Replies: 1
    • Views: 2,071
    01-27-2011, 09:12 AM Go to last post
  35. Solving Massive System from Likelihood Equation with Mathematica or MatLab

    Hello! From the likelihood equation we got the system of 32 equations and 16 inequalities and some constraints: we have real positive variables...

    Started by Valen‎, 01-27-2011 09:07 AM
    • Replies: 0
    • Views: 2,226
    01-27-2011, 09:07 AM Go to last post
  36. Need help for data weighing

    Can you please tell me what type of weigh should we use in an airline survey data. Can it be mulitple weighing or shall I use the PAX number weighing...

    Started by Stat‎, 01-27-2011 03:09 AM
    • Replies: 0
    • Views: 1,688
    01-27-2011, 03:09 AM Go to last post
  37. Target Value for Chi-Square Test

    I am working on a project that essentially involves "reversing" the chi-square test. A client wants to know what the expected value should be to see...

    Started by cswrye‎, 01-26-2011 05:55 PM
    • Replies: 1
    • Views: 2,166
    01-26-2011, 06:22 PM Go to last post
  38. Numerical Maximization of Massive Expression

    Hey,guys! I am real sorry if the question has been already asked, but I am really stuck with something.... I have a Likelihood Function , it...

    Started by Valen‎, 01-26-2011 08:31 AM
    • Replies: 4
    • Views: 3,066
    01-26-2011, 05:01 PM Go to last post
  39. Chi-square?

    I have one experimental group (n=15) and one control group (n=13) and I would like to compare the number of fallers in each group post intervention....

    Started by pcastro‎, 01-26-2011 07:10 AM
    • Replies: 0
    • Views: 2,221
    01-26-2011, 07:10 AM Go to last post
  40. Question on Bootstrap Inference

    Hi All, Say I have a time series X of length T that is split into two subperiods: X1 = X(0),X(1),...,X(T-n) and X2 = X(T-n+1),X(T-n+2),...,X(T),...

    Started by resetzero‎, 01-26-2011 04:38 AM
    • Replies: 0
    • Views: 3,076
    01-26-2011, 04:38 AM Go to last post
  41. How to analyze different, complex data sets?

    I'm looking for a good way to compare data sets. For 20 months, we collected larval fish using standard sampling gear (produces larval fish/cubic...

    Started by The_Hand_Hunter‎, 01-20-2011 01:23 PM
    ecological statistics, study design
    • Replies: 3
    • Views: 9,164
    01-25-2011, 04:13 AM Go to last post
  42. What is the proper way to divide a skewed dataset into high, medium, and low interval

    I don't know if this is the proper forum for this. Hello, I have a skewed dataset, and I am dividing it into high, medium and low values. I don't...

    Started by clazu‎, 01-23-2011 01:23 AM
    • Replies: 2
    • Views: 6,809
    01-24-2011, 11:37 AM Go to last post
  43. Advice on predictive modelling/forecasting

    Hi - I am looking for some advice on predictive forecasting. I will be taking measurements of power grid frequency data. These will all be within...

    Started by scothoward‎, 01-19-2011 08:28 AM
    • Replies: 1
    • Views: 3,663
    01-24-2011, 07:51 AM Go to last post
  44. Bayesian model - Prior - Sensitivity Analysis

    Hi, I'm looking for pointers(articles, papers etc) on sensitivity analysis on prior distributions in bayesian models. Could someone point me to...

    Started by panbalag‎, 01-23-2011 06:33 PM
    • Replies: 0
    • Views: 2,841
    01-23-2011, 06:33 PM Go to last post
  45. Deriving meaningful information from a set.

    Hello all, I was working for my statistics class and kind of extrapolated a problem. I think sharing this with this forum will help in coming...

    Started by vivek_12315‎, 01-23-2011 02:05 PM
    mining, stats
    • Replies: 5
    • Views: 2,833
    01-23-2011, 04:22 PM Go to last post
  46. Question testing problem

    Let X_1 and X_2 be random sample from a distribution having the probability distribution function f(x). Consider the testing of H_0:f(x)=f_0(x)...

    Started by Sambit‎, 01-21-2011 10:23 AM
    • Replies: 3
    • Views: 1,881
    01-22-2011, 10:06 AM Go to last post
  47. Mann-Whitney U Test for non random sample

    Hi I've got too groups Success and Failure I've got four sample populations in different industries that i've ranked by a measure of success. ...

    Started by arobbo‎, 01-19-2011 01:10 PM
    • Replies: 2
    • Views: 3,403
    01-20-2011, 03:31 AM Go to last post
  48. Lightbulb Using Kendall test to find correlation between Likert type data

    Greetings! I am doing a small experiment and I was wondering if I have the correct method for analysing the data. Two groups of participants...

    Started by kutlak.roman‎, 01-19-2011 11:31 AM
    analysis, correlation, data, kendall, likert
    • Replies: 0
    • Views: 4,250
    01-19-2011, 11:31 AM Go to last post
  49. Please help me in identifying proper Stat Tool

    I asked for help few days back, but probably my question was not clear that time. I have asked e-gov experts to rank some issues related to e-gov...

    Started by dibakar‎, 01-19-2011 02:01 AM
    • Replies: 7
    • Views: 2,464
    01-19-2011, 05:19 AM Go to last post
  50. Can relationship be both moderated and mediated?

    Hello....using SPSS I've found that the relationship between my IV and DV is fully mediated (Baron and Kenny) by Med1. I've also found using the...

    Started by eva2‎, 01-17-2011 01:59 PM
    • Replies: 3
    • Views: 3,700
    01-17-2011, 07:35 PM Go to last post
  51. Uninformative gamma prior for Poisson distribution

    Hi! I want to use Poisson distribution in my research to model some waiting times and I want to set the gamma prior to its parameter. I want the...

    Started by karamnula‎, 01-16-2011 06:27 AM
    • Replies: 7
    • Views: 20,540
    01-17-2011, 03:16 AM Go to last post
  52. Ranked data

    I asked my participants to rank 5 items as 1=least severe to 5 =most severe, now how can I analyse these data, parametric or non-parametric tests,...

    Started by edju‎, 01-15-2011 07:03 PM
    • Replies: 2
    • Views: 3,351
    01-16-2011, 02:10 PM Go to last post
  53. Question Relative risk

    Can anyone help me with this? I have two variables: 1) Immune suppression 2) Air space disease. Of the patients with NO immune suppression...

    Started by Vicci‎, 01-16-2011 01:45 PM
    • Replies: 0
    • Views: 3,379
    01-16-2011, 01:45 PM Go to last post
  54. Preference - which statistical method?

    I'm conducting an experiment on female preference with respect to male colouration (black vs. white male mice). The results of the experiment...

    Started by scully101‎, 01-15-2011 02:19 PM
    • Replies: 3
    • Views: 7,617
    01-15-2011, 03:38 PM Go to last post
  55. Choosing prior for beta and normal random variables

    Hi, I need to choose 1) a prior distribution for the mean and variance of a normal random variable. 2) a prior distribution for the shape...

    Started by panbalag‎, 01-14-2011 10:18 AM
    • Replies: 1
    • Views: 3,529
    01-14-2011, 10:31 AM Go to last post
  56. Likelihood Ratio Test

    Hello, I am attempting to develop a procedure to reduce the total number of trials while still being assured that the a distribution's parameters...

    Started by Jamesd2‎, 01-11-2011 06:28 PM
    hypothesis testing, likelihood
    • Replies: 5
    • Views: 4,448
    01-13-2011, 02:10 PM Go to last post
  57. Exclamation chi-square difference test

    Dear everybody, I need your help. I have submitted a manuscript showing that a two factor model is better than a single-factor model. I just have...

    Started by mohsenn‎, 01-13-2011 05:04 AM
    • Replies: 0
    • Views: 4,259
    01-13-2011, 05:04 AM Go to last post
  58. Gpower

    I'm wanting to run a study where I record motor evoked potentials evoked from a group of participants they view images of people performing reach and...

    Started by _Craig_‎, 09-23-2009 01:15 PM
    • Replies: 2
    • Views: 5,097
    01-11-2011, 08:28 AM Go to last post
  59. Grou x Time interactions

    Hi, I conducted in my clinical trial a mixed anova with repeated measures. What can I conclude if I find significant interactions Group x Time and...

    Started by pcastro‎, 01-09-2011 08:29 PM
    • Replies: 2
    • Views: 11,802
    01-10-2011, 05:26 AM Go to last post
  60. Is Post hoc necessary in a Mixed ANOVA 2x2

    Hi, I have 2 groups evaluated at time 1 and 2. I used Mixed ANOVA 2x2 but now I'm not sure if I have to do post hoc test. I have read some papers...

    Started by pcastro‎, 01-09-2011 12:59 PM
    • Replies: 1
    • Views: 6,041
    01-10-2011, 02:55 AM Go to last post

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