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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: 18,747
    10-11-2014, 12:02 PM Go to last post
  1. Is online survey random? How to make it random?

    Hi there, I want to conduct an online survey. I know that by default only some users would be included. How to increase randomness? Thank you.

    Started by Sylviastat‎, 12-22-2010 02:15 AM
    • Replies: 2
    • Views: 4,787
    12-25-2010, 06:14 AM Go to last post
  2. Factor Analysis vs Correspondence Analysis

    I was just reading about Factor and Correspondence Analysis. I am a bit confused from the time I realised that Correspondence Analysis also uses...

    Started by bsaikrishna‎, 12-27-2010 12:31 AM
    • Replies: 1
    • Views: 7,251
    12-27-2010, 05:00 AM Go to last post
  3. Help requested for difficult data set

    Would really appreciate any insights, please. I administered a survey to 20 participants, consisting of 136 images, and I asked them to rate each...

    Started by Statisticallychallenged‎, 12-31-2010 03:32 PM
    • Replies: 0
    • Views: 1,997
    12-31-2010, 03:32 PM Go to last post
  4. Survey statistics

    Hi, I agreed to help a friend out with a project and am trying to find appropriate statistical tests for survey data, but I fear the survey itself...

    Started by edwardoconnor‎, 12-17-2010 07:34 PM
    • Replies: 4
    • Views: 2,835
    01-01-2011, 02:20 PM Go to last post
  5. Thumbs up Industry effects

    Hi! I'm currently doing my master's thesis and I came accross the following problem: I have an (unbalanced) panel data sample consisting of...

    Started by AmosAnderson‎, 12-29-2010 06:43 AM
    • Replies: 1
    • Views: 1,901
    01-01-2011, 11:02 PM Go to last post
  6. appropriate test for comparing rank order of countries

    I have a dataset where countries are ranked based on how often they are chosen by firms in different time periods i.e. 1966-80, 1981-95, 1996-2010. I...

    Started by tstats‎, 01-01-2011 08:22 PM
    • Replies: 2
    • Views: 5,597
    01-02-2011, 05:57 AM Go to last post
  7. an event study? I can't stand. which way should I choose?

    Please a little help. There is an event. You can think a government interference . So, price of firms is decreased and therefore quantity of...

    Started by tiago2‎, 01-01-2011 07:12 AM
    • Replies: 3
    • Views: 6,406
    01-02-2011, 06:15 PM Go to last post
  8. G*Power 3.12 Help

    Hi all, I'm brand new to the forum and relatively new to the world of research. I'm an undergraduate preparing for graduate studies. If this is...

    Started by Ryman1510‎, 01-06-2011 11:09 AM
    • Replies: 0
    • Views: 3,017
    01-06-2011, 11:09 AM Go to last post
  9. 2 Dice Rolls vs. 1 Target Number

    Hi guys, I hope you don't mind my posting this here. I'm a game designer who needs some help working out probabilities for a dice roll mechanic, and...

    Started by Mechalus‎, 01-05-2011 05:42 PM
    • Replies: 3
    • Views: 4,138
    01-06-2011, 11:09 AM Go to last post
  10. Football (Soccer) Betting Model Inference

    British Football (Soccer) Betting Model Inference Hi,Guys! I am not a statistician, so please forgive me if I miss some points (which I surely...

    Started by Valen‎, 01-06-2011 11:02 AM
    • Replies: 2
    • Views: 5,171
    01-06-2011, 01:12 PM Go to last post
  11. Football(Soccer) Betting Model Inference

    Please sorry for reposting, I had a problem with my pictures in post, they were stored on my computer. I think it's better to attach them to the...

    Started by Valen‎, 01-07-2011 03:12 AM
    • Replies: 0
    • Views: 3,530
    01-07-2011, 03:12 AM Go to last post
  12. Repeated measures anova or t test

    Hi, The question I have is about which test I could use for the following case: - two groups (an experimental and a control group) - two measures...

    Started by pcastro‎, 12-17-2010 01:25 PM
    • Replies: 3
    • Views: 6,729
    01-08-2011, 12:43 PM Go to last post
  13. Post testing for the change in correlation between 2 variables over a 3rd linear variable

    I have a hypothesis that the strength of correlation between two continuous variables will decrease with higher levels of a third variable. To give...

    Started by dtae‎, 01-09-2011 02:04 PM
    continuous, correlation, interaction, regression, z-score
    • Replies: 0
    • Views: 3,349
    01-09-2011, 02:04 PM Go to last post
  14. 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: 6,064
    01-10-2011, 02:55 AM Go to last post
  15. 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: 11,842
    01-10-2011, 05:26 AM Go to last post
  16. 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: 5,114
    01-11-2011, 08:28 AM Go to last post
  17. 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: 4,279
    01-13-2011, 05:04 AM Go to last post
  18. 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: 4,456
    01-13-2011, 02:10 PM Go to last post
  19. 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: 3,539
    01-14-2011, 10:31 AM Go to last post
  20. 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: 7,637
    01-15-2011, 03:38 PM Go to last post
  21. 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: 3,395
    01-16-2011, 01:45 PM Go to last post
  22. 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: 3,364
    01-16-2011, 02:10 PM Go to last post
  23. 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: 20,593
    01-17-2011, 03:16 AM Go to last post
  24. 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: 3,716
    01-17-2011, 07:35 PM Go to last post
  25. 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: 2,470
    01-19-2011, 05:19 AM Go to last post
  26. 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: 4,269
    01-19-2011, 11:31 AM Go to last post
  27. 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: 3,412
    01-20-2011, 03:31 AM Go to last post
  28. 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: 1,886
    01-22-2011, 10:06 AM Go to last post
  29. 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: 2,849
    01-23-2011, 04:22 PM Go to last post
  30. 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: 2,852
    01-23-2011, 06:33 PM Go to last post
  31. 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: 3,692
    01-24-2011, 07:51 AM Go to last post
  32. 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: 6,840
    01-24-2011, 11:37 AM Go to last post
  33. 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: 9,199
    01-25-2011, 04:13 AM Go to last post
  34. 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: 3,100
    01-26-2011, 04:38 AM Go to last post
  35. 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: 2,231
    01-26-2011, 07:10 AM Go to last post
  36. 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: 3,074
    01-26-2011, 05:01 PM 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: 2,171
    01-26-2011, 06:22 PM Go to last post
  38. 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: 1,691
    01-27-2011, 03:09 AM Go to last post
  39. 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: 2,237
    01-27-2011, 09:07 AM Go to last post
  40. 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: 2,078
    01-27-2011, 09:12 AM Go to last post
  41. 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: 3,731
    01-27-2011, 04:20 PM Go to last post
  42. 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: 2,565
    01-29-2011, 01:05 PM Go to last post
  43. 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: 3,770
    01-30-2011, 08:46 AM Go to last post
  44. 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: 3,749
    01-30-2011, 09:15 PM Go to last post
  45. 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: 4,570
    01-31-2011, 03:01 AM Go to last post
  46. 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: 1,888
    01-31-2011, 01:09 PM Go to last post
  47. 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: 3,788
    02-01-2011, 12:39 AM Go to last post
  48. 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: 19,892
    02-01-2011, 04:52 AM Go to last post
  49. 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: 3,628
    02-01-2011, 06:58 PM Go to last post
  50. 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: 7,632
    02-03-2011, 04:35 PM Go to last post
  51. 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: 9,635
    02-03-2011, 10:12 PM Go to last post
  52. 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: 50,669
    02-04-2011, 01:40 PM Go to last post
  53. 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: 3,143
    02-04-2011, 03:05 PM Go to last post
  54. 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: 3,658
    02-04-2011, 05:42 PM Go to last post
  55. 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: 4,396
    02-06-2011, 02:55 PM Go to last post
  56. 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: 2,888
    02-07-2011, 10:17 PM Go to last post
  57. 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: 4,707
    02-08-2011, 12:23 AM Go to last post
  58. 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: 4,537
    02-08-2011, 12:41 AM Go to last post
  59. 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: 9,578
    02-08-2011, 05:04 AM Go to last post
  60. 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: 2,846
    02-09-2011, 05:19 AM Go to last post

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