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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: 18,723
    10-11-2014, 12:02 PM Go to last post
  1. Joint Probability From Correlation Function

    Dear all I have the following problem. Given a set of correlated binary variables, can I determine the joint probability from the correlation...

    Started by torkel‎, 03-23-2010 12:49 PM
    • Replies: 3
    • Views: 3,796
    07-18-2013, 03:14 AM Go to last post
  2. How to reduce number of variables using PCA analysis ?

    I would like to reduce the number of variables to add to the regression model. I have too many variables in relation to my samples. I have done PCA...

    Started by dada‎, 01-08-2013 02:59 PM
    • Replies: 3
    • Views: 6,595
    01-08-2013, 06:19 PM Go to last post
  3. 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: 3,343
    04-10-2013, 10:56 AM Go to last post
  4. Wilcoxon Signed Rank test or Spearman's rho?

    Dear madam/sir, My apologies for posting so quickly yet another question, but hopefully you can help me out once more. I'm still analyzing my survey...

    Started by blubblub‎, 04-19-2013 09:08 AM
    • Replies: 3
    • Views: 9,099
    04-19-2013, 12:12 PM Go to last post
  5. 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: 2,197
    04-08-2013, 06:43 PM Go to last post
  6. 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: 3,654
    03-19-2013, 02:54 PM Go to last post
  7. about random walk Metropolis algorithm

    Our model is: Y is distributed from a Negative binomial(r,p) where log(p/1-p)=xb. The prior of b is a multivariate normal(mu0,...

    Started by zzeta35‎, 01-06-2013 04:45 PM
    r code, rwm
    • Replies: 3
    • Views: 2,198
    01-06-2013, 07:50 PM Go to last post
  8. different test for normality

    Hi, Can anybody give a brief description for different non-parametric tests of distributions (like normality)? what are differences between...

    Started by Fred_a‎, 05-04-2013 08:02 PM
    kolmogorov-smirnov, lil, non parametric, shapiro-wilk test
    • Replies: 3
    • Views: 2,271
    05-05-2013, 12:58 PM Go to last post
  9. Can I use standard deviation in Likert scale (1-7) data with non normal distribution?

    I have 20 questions, each divided in 6 Likert scale items (1-7), representing 6 different values like Success, Oportunity, etc. The sample is rather...

    Started by nikospss‎, 12-27-2012 04:23 AM
    likert nonparametric
    • Replies: 3
    • Views: 4,763
    12-31-2012, 05:39 PM Go to last post
  10. Multiple regression with correlated predictors to check for explained variance

    Hi all, I have two predictive and one response variable and I'm trying to develop a model for predictions. Both predictors fit well (one slightly...

    Started by Oritteropus‎, 01-14-2013 12:15 PM
    multiple regression
    • Replies: 3
    • Views: 1,602
    01-15-2013, 03:30 AM Go to last post
  11. Hosmer_ Lemeshow test

    Dear teachers, In SPSS I ran a uniariate logistic regerssion to use the statistically significant ones in the multivariate logistic regression. I...

    Started by phi‎, 01-17-2013 04:11 PM
    • Replies: 3
    • Views: 2,876
    01-17-2013, 05:15 PM Go to last post
  12. Post Ratios of dependent variables

    Hello, I am conducting some research into tool marks. I have two sets of tool marks (A) and (B). I am trying to ascertain whether the tool...

    Started by bman‎, 01-22-2013 08:53 AM
    • Replies: 3
    • Views: 1,510
    01-22-2013, 10:08 AM Go to last post
  13. Bayesian Modeling Question

    :rolleyes:

    Started by bayesianman‎, 02-07-2013 10:55 PM
    • Replies: 3
    • Views: 1,401
    02-07-2013, 11:44 PM Go to last post
  14. 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: 1,673
    03-27-2013, 08:33 AM Go to last post
  15. CFA using AMOS: Poor model fit for an instrument

    Hi everyone, I'm conducting CFA using AMOS to evaluate the structure of an instrument. The following models are specified and evaluated: Model...

    Started by Star7‎, 10-25-2013 07:27 AM
    • Replies: 3
    • Views: 3,451
    10-25-2013, 06:10 PM Go to last post
  16. Ideal method of imputation when all variables have missing data?

    Need to impute data for a large data set - all variables except 1-2 contain missing data so multiple imputation isn't working well. Any suggestions...

    Started by dx2724‎, 02-23-2013 04:34 AM
    • Replies: 3
    • Views: 1,623
    02-23-2013, 11:52 PM Go to last post
  17. 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: 2,037
    04-08-2013, 05:53 PM Go to last post
  18. 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: 2,287
    04-10-2013, 12:33 AM Go to last post
  19. [ask] estimate the word "precision" from statistical book by using cluster sampling

    hi everyone, i have been a task about how to estimate the word "precision" from statistical book by using cluster sampling. plz help me, i've been...

    Started by harris‎, 04-21-2013 11:50 PM
    • Replies: 3
    • Views: 1,673
    04-23-2013, 07:03 AM Go to last post
  20. 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: 2,171
    04-03-2013, 12:49 PM Go to last post
  21. Response ratio

    Hi there, I want to explore the possibility of using meta-analysis statistics for prediction of various scenarios. I came across a...

    Started by yoavp81‎, 05-07-2013 02:23 AM
    • Replies: 3
    • Views: 7,308
    05-07-2013, 11:10 AM Go to last post
  22. Help with choosing right statisical method.

    Hi I am new at statistic and am writing my bachelor thesis. I am not really sure how to interpret the statistical significance of my final...

    Started by metlou‎, 05-29-2013 06:39 AM
    elisa
    • Replies: 3
    • Views: 1,475
    06-03-2013, 12:29 PM Go to last post
  23. Two questions about normality of distribution

    Hello, I have 2 key questions: 1. I have a continuous variable in my dataset which is definitely not normally distributed. I converted the...

    Started by variancesquared‎, 05-10-2013 08:10 AM
    • Replies: 3
    • Views: 2,017
    05-10-2013, 08:44 AM Go to last post
  24. How to handle twins in an ROC curve?

    Hi everyone, I'm shaping some ROC curves for a study I'm working on, and our dataset is from a twin study. The main model is a LMM that has a...

    Started by renbelcher‎, 05-28-2013 10:22 AM
    • Replies: 3
    • Views: 1,317
    05-28-2013, 03:33 PM Go to last post
  25. True mean and the Central Limit Theorem

    I've learned some pretty remarkable things about the Central Limit Theorem and the so-called Sampling Distribution of the Sample Mean. But there's...

    Started by aut0pilot101‎, 06-15-2013 03:56 PM
    • Replies: 3
    • Views: 1,319
    06-15-2013, 04:21 PM Go to last post
  26. test of equality of covariance (or correlations) among DISCRETE variables?

    i have been trying to find significance tests whose null hypothesis is that the non-redundant, off-diagonal elements of a covariance (or correlation)...

    Started by spunky‎, 06-15-2013 08:25 PM
    • Replies: 3
    • Views: 1,516
    06-16-2013, 04:55 PM Go to last post
  27. Latent Factors and Dimensionality

    Can someone briefly explain to be the difference between factors in a latent sense and a dimensional sense? I've managed to get myself confused and I...

    Started by loops22‎, 07-10-2013 08:27 AM
    • Replies: 3
    • Views: 1,298
    07-10-2013, 11:51 AM Go to last post
  28. Kendall's Tau with average values of ranked variables

    Hi, I have a set of 11 variables with a frequency ranking scale of "never" (1) to "always" (5) + "not applicable". Each variable is a normal step...

    Started by talyenn‎, 06-25-2013 03:43 AM
    • Replies: 3
    • Views: 1,363
    06-30-2013, 07:23 AM Go to last post
  29. Skewed data - what test should I use

    Research question: Does wearing a helmet affect head repositioning error in a group of normal participants compared to not wearing a helmet? 3...

    Started by KDS‎, 08-03-2013 05:50 AM
    median test, skewed data
    • Replies: 3
    • Views: 5,733
    08-04-2013, 07:08 PM Go to last post
  30. Unhappy A little guideance needed...

    First off, I hoped I've posted in the right forum-if not sorry xx I'm working through a sample question regarding a sample of 20 sections of...

    Started by Charlie Day‎, 07-29-2013 03:58 PM
    • Replies: 3
    • Views: 1,962
    07-30-2013, 07:15 AM Go to last post
  31. Sample size of US prison population....

    So, I'm doing research on economic background of people in US prisons and have to collect the data manually so I'm wondering how many I really need...

    Started by cms‎, 08-10-2013 01:11 PM
    • Replies: 3
    • Views: 2,644
    08-12-2013, 07:56 AM Go to last post
  32. Comparing 3D points/surfaces statistically.

    Hello. I'm performing two-at-a-time analysis on simulation data, plotting the output metric (Z axis) for each combination of two parameters (X,Y...

    Started by atreide‎, 08-18-2013 02:31 PM
    • Replies: 3
    • Views: 2,363
    08-20-2013, 04:56 AM Go to last post
  33. Analyzing Pooled Likert Data

    Hi Everyone, I'm analyzing Likert Survey Responses for a question "How satisfied are you with your Item?" (1 = Very Dissatisfied / 5 = Very...

    Started by ac2013‎, 09-13-2013 06:21 AM
    • Replies: 3
    • Views: 1,042
    10-01-2013, 08:40 AM Go to last post
  34. Spearmans test suitable for import/export/price data of Ghanaian tuna?

    I have a range of simple graphs and I just want to make simple observations i.e. imports are increasing/decreasing significantly or not over time, or...

    Started by nelson_rabbit‎, 09-04-2013 04:22 AM
    • Replies: 3
    • Views: 1,487
    09-04-2013, 09:36 AM Go to last post
  35. Ancova

    Hello, For an ANCOVA the scores for each group (defined by the levels of the factors) should be normally distributed. Does this apply for the...

    Started by Wilbert‎, 08-31-2013 01:02 PM
    • Replies: 3
    • Views: 1,321
    09-03-2013, 05:08 AM Go to last post
  36. R-square and mixed models

    What is the best way to calculate the R-square of a linear mixed model? May first guess would be to correlate the predicted values with the observed...

    Started by Wilbert‎, 09-03-2013 06:33 AM
    • Replies: 3
    • Views: 3,564
    09-05-2013, 04:38 AM Go to last post
  37. Converting individual scores into group scores in SPSS

    Hello all, I am using SPSS for my Master thesis and I've got a question. Hope someone is able to help me, because I'm stuck. My variables are:...

    Started by Kimsty‎, 09-23-2013 01:12 PM
    • Replies: 3
    • Views: 4,535
    09-24-2013, 02:25 PM Go to last post
  38. How to report Correspondence Analysis

    Hi. I'm busy with a scientific research honours thesis, and for my results the statistician at my university conducted a correspondence analysis...

    Started by Adri‎, 10-10-2013 02:36 AM
    correspondence analysis, eigenvalue, reporting results, scatterplot
    • Replies: 3
    • Views: 1,756
    10-10-2013, 04:48 AM Go to last post
  39. Estimation Maximization

    Hello everybody! I have a general question concerning Estimation Maximization (EM): I understand from literature research, that EM is not possible...

    Started by therp‎, 11-17-2013 07:09 AM
    • Replies: 3
    • Views: 3,872
    11-18-2013, 05:19 AM Go to last post
  40. Post General method for data analysis

    Dear community, maybe you can help me. I have a lots of data like this format: Person/points/work/power/sex Person1/75/10/120/m...

    Started by Dotana‎, 11-11-2013 08:52 AM
    • Replies: 3
    • Views: 1,337
    11-14-2013, 10:32 AM Go to last post
  41. Chi Square for Likert Scale in Single Sample

    Evening All, I do hope someone can shed some light on my fog of the chi square. I conducted a single sample survey using Likert Scale scored 1-5...

    Started by smithtl68‎, 01-07-2014 08:10 PM
    chi square, cluster randomized, hypotheisis testing, likert scale, null hypothesis
    • Replies: 3
    • Views: 9,571
    01-23-2014, 10:18 AM Go to last post
  42. Question about sample size and margin of error

    I am trying to determine if my dataset sample size is large enough to be statistically significant. I'm using a 95% confidence interval. However,...

    Started by zizekkeynes‎, 12-05-2013 01:37 PM
    power, sample size
    • Replies: 3
    • Views: 1,404
    12-06-2013, 02:46 AM Go to last post
  43. Picking Statistical Analysis - Does Funding Mitigate Impact of Poverty

    Hi everyone, Thank you in advance for any help you can provide. I am new to the forum and hope to stick around for a while. I am working on...

    Started by JerLon‎, 11-26-2013 09:20 AM
    • Replies: 3
    • Views: 1,824
    11-26-2013, 01:12 PM Go to last post
  44. R packeg of gamm4 mgcv

    kindly guide me about this packeg using

    Started by maqsood.aslam‎, 12-12-2013 10:39 AM
    • Replies: 3
    • Views: 1,881
    12-13-2013, 07:25 AM Go to last post
  45. Smearing Transformation

    I've found several papers on the smearing transformation for ln(x). However, I"m curious if there is one for ln\frac{x}{1-x}. I can't find...

    Started by Jrb599‎, 01-19-2014 11:20 AM
    • Replies: 3
    • Views: 1,436
    01-20-2014, 02:04 AM Go to last post
  46. URGENT: Two-Way Anova or Regression

    Hi, I would really appreciate some help with this. I am looking to see if employees' organisational history (such as voluntary/involuntary turnover)...

    Started by CA92‎, 01-24-2014 10:45 AM
    anova, assumptions, levene, levene's test, regression
    • Replies: 3
    • Views: 1,110
    01-24-2014, 01:47 PM Go to last post
  47. Multiple Paired t-tests

    Hi, I'm having a little bit of trouble with some research I'm doing and wondered if anyone could help. I'm looking at political decision-making....

    Started by brian_maddox‎, 01-24-2014 01:08 PM
    • Replies: 3
    • Views: 1,785
    01-28-2014, 03:50 PM Go to last post
  48. Lightbulb Mann Whitney help

    Hi, I did a small experiment and I had 4 distribuitons. these are not normal distribuitions, that is why my professor told me to run a Man...

    Started by tritto‎, 02-07-2014 02:39 PM
    mann-whitney
    • Replies: 3
    • Views: 1,611
    02-07-2014, 05:14 PM Go to last post
  49. need help for senior thesis/ NCHA data

    I am doing a senior thesis. I will be using secondary data from the NCHA. I want to see if there are gender differences in abusive relationships....

    Started by futureJDstudent‎, 02-24-2014 06:52 PM
    • Replies: 3
    • Views: 1,492
    02-24-2014, 08:23 PM Go to last post
  50. Meta-analysis - can I combine/use these studies?

    Hi! I'm trying to set up a meta-analysis with my thesis partner and we ran into trouble which our supervisor isn't able to solve. So I figured...

    Started by Jiske‎, 03-04-2014 11:21 AM
    compare main effects, interaction effects, meta-analysis
    • Replies: 3
    • Views: 2,823
    03-04-2014, 05:04 PM Go to last post
  51. can non parametric tests be modified for one tailed tests?

    Hello all, super newbie here. just a quick question: I have been doing one tailed independent two sample t tests but now on other data I no...

    Started by jesshodgson‎, 03-04-2014 11:54 PM
    • Replies: 3
    • Views: 1,350
    03-05-2014, 04:29 AM Go to last post
  52. How to test using Spearman correlation in R?

    Given such data X-Y 2-6 4-9 6- 3 8- 12 10- 15 When using pearson correlation it will be straight forward, however, when using spearman,...

    Started by John.Thomas‎, 03-07-2014 09:59 AM
    correlations, spearman's rho
    • Replies: 3
    • Views: 1,614
    03-07-2014, 10:16 AM Go to last post
  53. Exclamation Picking the correct test, need help urgently!

    Hello, I feel like the answer for this is probably really obvious but I am being missing it altogether. This is my data: Habitat Associating Not...

    Started by Annielk‎, 04-09-2014 09:16 AM
    assumptions, chi sq, independance, statistics
    • Replies: 3
    • Views: 1,142
    04-09-2014, 12:35 PM Go to last post
  54. Which one should I trust : shapiro test or qq plot?

    Good evening everyone, Sorry if this question already exist, I searched but didn't find an asnwer. I am using 7-points likert scale for my...

    Started by typhoss‎, 04-08-2014 08:39 PM
    • Replies: 3
    • Views: 1,844
    04-09-2014, 05:02 PM Go to last post
  55. Analyzing 311 Calls trend

    For an assignment, I am analyzing 311 call trends. I have downloaded the total number of 311 calls made in my city per month for the last five years...

    Started by Statz‎, 04-28-2014 03:21 PM
    • Replies: 3
    • Views: 1,439
    04-28-2014, 03:55 PM Go to last post
  56. Balancing data

    A couple of classification (lets stick to only two groups for simplicity) models are performing better if we balance the data when there are few...

    Started by Englund‎, 05-01-2014 02:32 PM
    • Replies: 3
    • Views: 1,086
    05-02-2014, 01:18 PM Go to last post
  57. Percentage and probability

    I have this problem I am trying to solve and I am not sure how. Lets say 70% of the demography is white people. Now if I randomly pick 100 people...

    Started by informedman‎, 05-29-2014 07:58 PM
    probabilities
    • Replies: 3
    • Views: 2,069
    05-29-2014, 09:03 PM Go to last post
  58. Invasive mussels: use ANOVA or another type of analysis

    Hope this is right place for this: I am a PhD student studying performance and population dynamics of invasive freshwater mussels (zebra and quagga...

    Started by Nathan.Haag‎, 05-30-2014 01:47 AM
    • Replies: 3
    • Views: 1,386
    05-30-2014, 10:30 AM Go to last post
  59. Performance of CSIs at Crime Scenes

    Hi, Im after some advice, which i would really appreciate assistance with. At our police force the CSIs are being performance tested by use of...

    Started by musclebeach‎, 06-12-2014 07:26 PM
    • Replies: 3
    • Views: 2,201
    06-19-2014, 06:27 AM Go to last post
  60. Interaction or moderation effect - suitable method for analysis?

    I have run a two-way between groups ANOVA to analyse my data. However, I have one more variable, which is not one of the factors in the ANOVA. I want...

    Started by Stefan Stefanov‎, 06-15-2014 07:03 AM
    interaction, interaction effect, moderation, spss
    • Replies: 3
    • Views: 1,965
    06-17-2014, 08:16 AM Go to last post

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