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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: 18,787
    10-11-2014, 12:02 PM Go to last post
  1. What method to use for my research

    Hello all, thank you for taking the time to read this! I have the following statistics problem. I am have a small number of documents from...

    Started by henryvth‎, 04-17-2013 03:50 AM
    • Replies: 0
    • Views: 537
    04-17-2013, 03:50 AM Go to last post
  2. Which test to use for my data? Thanks

    Hi all, I have unequeal sample sizes so I am a little lost as to which test to use for my data. I have a total of 113 patients with one group being...

    Started by mrobert6‎, 04-15-2013 08:55 AM
    • Replies: 6
    • Views: 1,481
    04-16-2013, 07:27 AM Go to last post
  3. Pooling and a posteriori

    Sorry if I am posting this in the wrong forum, administrators feel free to move my thread! I am having some difficulties understanding when to use...

    Started by gerbera‎, 04-16-2013 05:56 AM
    • Replies: 1
    • Views: 967
    04-16-2013, 07:16 AM Go to last post
  4. Research statistical analyses

    I have created my dissertation project ' The effect of eye gaze on the recognition of emotional expression in children with autistic spectrum...

    Started by Le2jbs‎, 04-16-2013 04:37 AM
    • Replies: 0
    • Views: 941
    04-16-2013, 04:37 AM Go to last post
  5. Sphericity- why does it really matter?

    Can someone help me understand how a sphericity violation is a problem in repeated measures ANOVA a little better? I assume a sphericity violation...

    Started by DrJBN‎, 04-08-2013 09:08 AM
    • Replies: 9
    • Views: 1,883
    04-16-2013, 01:40 AM Go to last post
  6. Fisher's Scoring Iterations ?

    Hi, what does Fisher's Scoring Iteration mean?? Fisher's exact calculation gives a score of 4 but what does this number mean exactly?? Thanks, S

    Started by palmer86‎, 04-15-2013 03:15 PM
    • Replies: 0
    • Views: 4,363
    04-15-2013, 03:15 PM Go to last post
  7. Solving a partial correlation matrix

    One of the problems on my homework assignment is a partial correlation coefficient. I am in the dark on this one as I had drill the last class we...

    Started by Marine‎, 04-14-2013 10:04 PM
    • Replies: 0
    • Views: 1,218
    04-14-2013, 10:04 PM Go to last post
  8. Help with samples-t test problem

    Hello everyone, I having difficulty with a particular problem on my homework assignment. The problem is a difference between groups t test...

    Started by Marine‎, 04-14-2013 07:32 PM
    • Replies: 1
    • Views: 2,364
    04-14-2013, 08:19 PM Go to last post
  9. ¿Weighted moments references?

    Hi, I have a sample of frequencies and Sums(totals): Ni Si 23 12345 10 7800 ... Si is the sum over some variable X, measured...

    Started by uozz2‎, 04-14-2013 06:56 AM
    • Replies: 0
    • Views: 20,536
    04-14-2013, 06:56 AM Go to last post
  10. Effect size measures comparability

    Hi everyone, I registered just now, because I have been struggling with a question I have not been able to answer (and one of my fellow graduate...

    Started by hanzifranz‎, 04-13-2013 02:13 PM
    • Replies: 0
    • Views: 1,781
    04-13-2013, 02:13 PM Go to last post
  11. Question How to calculate test reliability with different exam versions

    Hello All, I'm new to this forum and this is my first questions. We have 1500 students and each student will receive a test that has 30...

    Started by engalnoor‎, 04-12-2013 04:16 PM
    • Replies: 0
    • Views: 1,319
    04-12-2013, 04:16 PM Go to last post
  12. A question about General Linear Model and random factors

    Hi everyone. :wave: I have the following problem. In an experiment I had a number of plants of two developmental stages. I applied a treatment with...

    Started by Kassandra‎, 04-12-2013 03:37 PM
    • Replies: 0
    • Views: 1,811
    04-12-2013, 03:37 PM Go to last post
  13. Regression

    Hi All, I have a quick question about the correlation before conducting regression. If there was no correlation between x and y, is there any...

    Started by ghada8888‎, 04-12-2013 12:43 PM
    • Replies: 8
    • Views: 1,448
    04-12-2013, 03:12 PM Go to last post
  14. proper sample size and number of estimation for comparing two predictors' AUCs

    Hello, I am trying to do classification of patients by using different predictors. I want to do bootstrapping for a number of times so that I can...

    Started by uwold‎, 04-11-2013 11:25 PM
    bootstrapping, roc curve, sampling with replacement
    • Replies: 1
    • Views: 1,309
    04-12-2013, 01:31 PM Go to last post
  15. Which statistical analysis technique to use in my research

    Hi Everyone, My research contains the following 1. Multiple independent input variables. 2. One dependent variable. 3. All the variables are...

    Started by arjuna‎, 04-12-2013 09:00 AM
    • Replies: 0
    • Views: 1,048
    04-12-2013, 09:00 AM Go to last post
  16. examples from discrete data where an underlying continuous distribution is present...

    Hello. I am not sure if people here are familiar with the Pearson (as in Karl Pearson) Yule debate concerning whether some types of discrete data are...

    Started by will22‎, 04-11-2013 11:25 PM
    • Replies: 0
    • Views: 1,181
    04-11-2013, 11:25 PM Go to last post
  17. help with pilot study

    My IVS: I manipulated race of a job candidate (black or white) as well as the job candidate’s SES (Low SES or High SES) I then gave a survey...

    Started by norajones‎, 04-03-2013 11:44 AM
    • Replies: 2
    • Views: 1,369
    04-10-2013, 10:20 PM Go to last post
  18. Ordinal data analysis and hypothesis testing

    Hello, I have been working on a survey analysis and have to test hypothesis if the specified kind of software resulted in increased performance of...

    Started by DenisD‎, 04-10-2013 06:49 AM
    • Replies: 3
    • Views: 3,384
    04-10-2013, 10:56 AM Go to last post
  19. Exclamation create similar selection groups out of 4 cohorts - is it possible?

    I am currently doing a study where I need to select a number of 50 members from 4 cohorts of 100 members each. 400 members have been placed in 4...

    Started by statisticaly‎, 04-10-2013 06:25 AM
    • Replies: 0
    • Views: 1,157
    04-10-2013, 06:25 AM Go to last post
  20. Correlation and Regression

    Hi all, I have a question about the significant p value in both correlation and regression. Is there any difference between the p values in both...

    Started by ghada8888‎, 04-09-2013 03:51 PM
    • Replies: 4
    • Views: 1,573
    04-10-2013, 02:37 AM Go to last post
  21. Which statistical test to use for the following scenario?

    Firstly, thanks for taking the time to read my post. The scenario: I have 20 novice darts players- split into 5 teams. They're told it's a darts...

    Started by 03turnerS‎, 04-09-2013 07:36 PM
    • Replies: 3
    • Views: 2,301
    04-10-2013, 12:33 AM Go to last post
  22. 2 Sample T Test for Nonnormal data

    Hi everyone! I work in the advertising industry and I am in the process of creating a t test calculator. The calculator will be used to test the...

    Started by goducks13‎, 04-05-2013 08:48 PM
    • Replies: 10
    • Views: 2,716
    04-09-2013, 07:13 PM Go to last post
  23. Correlations among responses to a forced-choice scale

    I have data from participants who rate emotional content of pictures. Specifically, people see 20 pictures of abstract paintings (one at a time) and...

    Started by gbarto3‎, 03-29-2013 09:29 PM
    correlation, forced-choice scale
    • Replies: 3
    • Views: 2,238
    04-08-2013, 06:43 PM Go to last post
  24. Cluster analysis - using statistiXL package for excel - how to determine a cluster

    Hello, I have a fairly basic question. I've used the trial package of statisiXL for excel to run a cluster analysis on the following data: ...

    Started by frans‎, 03-29-2013 09:42 AM
    cluster analysis, statistical test
    • Replies: 2
    • Views: 2,136
    04-08-2013, 06:33 PM Go to last post
  25. Categorical covariate in ancova??

    I have 1 continuous IV, one categorical IV and one continuous DV. Normally you'd investigate the effect of the categorical IV on the DV, corrected...

    Started by kelvarnsen‎, 03-28-2013 02:46 PM
    • Replies: 1
    • Views: 4,270
    04-08-2013, 06:03 PM Go to last post
  26. Data Transformations

    I'm working with 15 variables or so in a dataset (n=5,000ish) and one of the variables has a strong negative skew to it (skew = -.947, std. error =...

    Started by PikeyJM‎, 04-08-2013 01:20 PM
    • Replies: 3
    • Views: 2,065
    04-08-2013, 05:53 PM Go to last post
  27. Question Discrete time series analysis

    Hello everybody, Well, as student I'm working this last year on my bachelor proof. The subject I'd chosen is discrete (integer) valued time...

    Started by normal_david‎, 04-08-2013 02:01 PM
    discrete, integer, time series
    • Replies: 0
    • Views: 1,686
    04-08-2013, 02:01 PM Go to last post
  28. Help with research

    I will start by saying statistics is not my strong point so any help is greatly appreciated. I would like advice on methods to analyze the data I...

    Started by ELAPIERRE‎, 04-07-2013 04:05 PM
    • Replies: 1
    • Views: 1,079
    04-07-2013, 04:22 PM Go to last post
  29. Is it possible to Reduce/Correct Bias through EM algorithm?

    I am dealing with few overdispersed count models and using mixed Poisson distributions to deal with overdispsered data. I've used MLE technique to...

    Started by arun‎, 04-05-2013 09:00 AM
    bias, estimation, expectation-maximization
    • Replies: 0
    • Views: 1,187
    04-05-2013, 09:00 AM Go to last post
  30. Multiple Imputation in SPSS

    This might be a silly question but I thought I'd ask it just to be safe. I put a survey online that I got responses to so I am dealing with...

    Started by PikeyJM‎, 04-04-2013 12:16 PM
    • Replies: 0
    • Views: 1,734
    04-04-2013, 12:16 PM Go to last post
  31. Application of statistics for sample of a population (Urban Renewal)?

    I am bachelors student working on a report regarding Urban renewal. I am given a certain area to study. Study area include the socioeconomic aspects...

    Started by MirAli‎, 04-04-2013 02:10 AM
    • Replies: 1
    • Views: 935
    04-04-2013, 05:04 AM Go to last post
  32. Average Replicates before Conducting an ANOVA?

    If there are multiple replicates of a trial condition, should they be averaged before conducting an ANOVA? For example, I am looking to measure...

    Started by sudds779‎, 04-02-2013 06:46 PM
    • Replies: 3
    • Views: 2,201
    04-03-2013, 12:49 PM Go to last post
  33. Mediation Analysis

    Hi All, Could any one explain for me what is the exact differences between full Mediation and partial Mediation? With some example please. Many...

    Started by ghada8888‎, 04-03-2013 09:22 AM
    • Replies: 2
    • Views: 1,436
    04-03-2013, 11:38 AM Go to last post
  34. i want to give a high number to bater research

    hi i have 2 research that i want to take Tham to in my calculation i want to make give each research a factor the 2 research explore 5...

    Started by mgm7200‎, 04-02-2013 04:50 PM
    • Replies: 1
    • Views: 1,186
    04-02-2013, 04:57 PM Go to last post
  35. Statistical method(s) for repeated measures....

    Hi all, I'm doing a project where I want to see the effect of diet. The tricky part here is that same people have been answering a questionnaire...

    Started by userfriendly‎, 03-04-2013 03:17 AM
    • Replies: 4
    • Views: 1,861
    04-01-2013, 02:26 PM Go to last post
  36. correction for multiple comparisons to zero (one t-test) data is notmally distributed

    Hello, I am a PhD research student in the area of vision science. I am struggling to find a way to show that difference in eye position are...

    Started by lsween11‎, 03-07-2013 10:31 AM
    • Replies: 1
    • Views: 1,506
    04-01-2013, 02:19 PM Go to last post
  37. Multiple comparisons and multiple time points

    Hi all, I wanted to ask a questions that I would assume I should know by now... I have done an experiment where I am evaluating the effect of...

    Started by Bioman‎, 03-08-2013 09:34 PM
    • Replies: 4
    • Views: 2,158
    04-01-2013, 02:10 PM Go to last post
  38. Using a 'Z score' in a correlation.

    Hi all, I'm conducting a bi-variate correlation, using pearsons. Can i use a z score as one variable with the other variable being dichotomous? ...

    Started by pg0410‎, 03-14-2013 02:49 PM
    • Replies: 9
    • Views: 4,188
    04-01-2013, 01:59 PM Go to last post
  39. setting parameters in G*power for correlation tests

    Hello, everyone :) Need your help on how to set parameters in G*power... I am doing two very simple tests: one on pearson correlation between...

    Started by invisibleme‎, 03-29-2013 01:28 PM
    correlation, partial correlation, power
    • Replies: 0
    • Views: 2,779
    03-29-2013, 01:28 PM Go to last post
  40. Normality in repeated measures

    In two groups of four – an experimental group and a control group. Over a six week period, all students were assessed three times. I have to find the...

    Started by Rajani‎, 03-29-2013 08:48 AM
    • Replies: 0
    • Views: 1,188
    03-29-2013, 08:48 AM Go to last post
  41. PhD study

    Dear individuals of intelligence, I would like to know if anyone can help choose the correct statistical test to carry out on my data that I have...

    Started by Maleym‎, 03-29-2013 04:09 AM
    anova, spss, statistic, test of indepdence
    • Replies: 1
    • Views: 1,098
    03-29-2013, 05:10 AM Go to last post
  42. Online-estimate of squared correlation coefficient for linear optimization

    Summary: Is there a way to directly estimate the squared correlation between two zero-mean Gaussian variables on-line and without storing more than...

    Started by blue2script‎, 03-28-2013 03:36 PM
    correlation, expectation, optimization
    • Replies: 0
    • Views: 1,818
    03-28-2013, 03:36 PM Go to last post
  43. Multivariate Normality accepted at 5% significance level but rejected at 1% ??

    Hi, I am new to this forum. I am trying to test whether a set of variables in the data follow multivariate normal distribution. I found Mardia's...

    Started by ashutosh‎, 03-27-2013 02:15 PM
    multivariate normal, null hypothesis, p value, significance level
    • Replies: 1
    • Views: 2,872
    03-27-2013, 02:30 PM Go to last post
  44. Help needed with interpretation of a (clear) 2x3-ANOVA interaction

    Dear Stats community I hope someone can help me interpreting my results. I ran two tests, each with three participant groups. So I have a...

    Started by minimax‎, 03-08-2013 10:27 AM
    • Replies: 3
    • Views: 1,684
    03-27-2013, 08:33 AM Go to last post
  45. Compute a new variable or is there a better way to do this?

    First post, thanks in advance for advice. I would like to examine three variables, with the expectation that: When a subject scores HIGH on...

    Started by vexedpsych‎, 03-26-2013 03:25 PM
    • Replies: 2
    • Views: 1,622
    03-26-2013, 04:07 PM Go to last post
  46. Mann Whitney vs. two tailed t-test

    I am new to statistics and am in need of some help. I am running a study where I am providing two groups with surveys to test for their perceptions...

    Started by bjrscj‎, 03-22-2013 10:33 PM
    • Replies: 0
    • Views: 3,139
    03-22-2013, 10:33 PM Go to last post
  47. Durbin-Watson statistics - autocorrelation

    If the Durbin-Watson statistics for the OLS regression was 2.268, does it suggest that there is no autocorrelation among residuals since d is near 2?...

    Started by eunkum‎, 03-21-2013 10:25 AM
    • Replies: 4
    • Views: 3,542
    03-21-2013, 04:01 PM Go to last post
  48. Cox Proportional Hazard method survival analysis

    Cox Proportional Hazard method survival analysis is the same as Cox regression analysis?

    Started by eunkum‎, 03-15-2013 03:43 PM
    • Replies: 1
    • Views: 2,516
    03-20-2013, 02:22 PM Go to last post
  49. Canonical Discriminant analysis.

    Hi everyone :) I am new here. May be my query is too easy for you people but I have no idea how to do that. :confused: :( .Please help me. So my...

    Started by sristi‎, 03-06-2013 02:51 AM
    • Replies: 3
    • Views: 3,703
    03-19-2013, 02:54 PM Go to last post
  50. discriminant linear analysis, coefficient interpretation

    Hi everyone, I am trying to weigh the effect of two independent variables (age, gender) on a response variable (pass or fail in a Math's test)....

    Started by parsec2011‎, 03-17-2013 09:57 PM
    • Replies: 2
    • Views: 19,399
    03-19-2013, 02:47 PM Go to last post
  51. Which test to use please?

    Hello, I am relatively new to Stats and am have troubles deciding which test to use. I am testing the risky shift phenomenon. Participants were...

    Started by AthenaAnkou‎, 03-19-2013 08:35 AM
    • Replies: 2
    • Views: 2,921
    03-19-2013, 12:48 PM Go to last post
  52. Panel Data Fixed Effects with year dummies

    I wasn't sure quite were to put this thread, so I'm posting here even though it's very similar to another one I posted in another thread. Quick...

    Started by ewalcott‎, 03-19-2013 09:54 AM
    fixed effects, panel data
    • Replies: 0
    • Views: 3,425
    03-19-2013, 09:54 AM Go to last post
  53. How to analyse scale data?

    Hi all, For my dissertation I have done a likret scale questionnaire, 1-5 (1=strongly disagree, 2=mostly disagree....) about body image (10...

    Started by Sarah-dee‎, 03-19-2013 09:16 AM
    likert scale analysis, spss
    • Replies: 0
    • Views: 1,427
    03-19-2013, 09:16 AM Go to last post
  54. Analysis of electricity consumsion

    Hello @all I want to analyze on how several factors have an effect on electricity consumtion (measured in mw). Before I start to gather the data,...

    Started by chesterluck‎, 03-19-2013 03:01 AM
    electricity consumtion, methodology, mlr, right model
    • Replies: 0
    • Views: 1,062
    03-19-2013, 03:01 AM Go to last post
  55. Uniform minimum variance unbiased estimator

    Hello, I need help with the develpment of this exercise that I'm trying to solve. Let \widehat{\sigma} be the U.M.V.Uestimate of \sigma when \mu...

    Started by sanmath‎, 03-18-2013 12:21 AM
    • Replies: 0
    • Views: 2,792
    03-18-2013, 12:21 AM Go to last post
  56. Question basic hypothesis testing

    am new to the forum, and would appreciate some help. i'm studying the relationship between worker performance (x) and pay (y) i'm trying to...

    Started by rcreat‎, 03-17-2013 11:43 AM
    • Replies: 2
    • Views: 1,455
    03-17-2013, 01:49 PM Go to last post
  57. Between-Group and Within-Group PCA

    Hi all, I'm running a PCA with two species (one fossil and one extant) divided into multiple geographic groups. The program I'm using is called...

    Started by osteomatrix‎, 03-16-2013 08:28 PM
    between-group, pca, principal components, principle component, scatterplot
    • Replies: 0
    • Views: 2,415
    03-16-2013, 08:28 PM Go to last post
  58. Help Hierarchial Cluster Analysis & Categorical data

    :confused: Hi, I am trying to cluster my variables which are all the letters of the alphabet by the observations of many participants in a...

    Started by Jalsalmi‎, 03-16-2013 06:21 PM
    categorical variables, cluster
    • Replies: 0
    • Views: 2,437
    03-16-2013, 06:21 PM Go to last post
  59. Unhappy Help with Dissertation Survey Data Input in SPSS

    Hi all, I was looking for some help with inputting the data from my survey's into SPSS for analysis. I've conducted a survey on Internet Banking...

    Started by AJV171‎, 03-16-2013 08:06 AM
    • Replies: 0
    • Views: 1,314
    03-16-2013, 08:06 AM Go to last post
  60. Correlation and significance with dependent observations

    Hi, I am trying to correlate two variables of which one variable has dependent observations as it is data derived from a social network. I am...

    Started by ttv‎, 03-16-2013 06:05 AM
    correlation, dependent observations, significance test, spearman's
    • Replies: 0
    • Views: 1,096
    03-16-2013, 06:05 AM Go to last post

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