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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: 19,443
    10-11-2014, 12:02 PM Go to last post
  1. Generalized estimating equations and multiple imputation

    Hi, I'm running a Generalized estimating equation model with multiple imputed data but I can not get a pooled outcome. Do anyone have a solution to...

    Started by Ulrik‎, 10-29-2014 03:54 AM
    gee multiple imputation
    • Replies: 4
    • Views: 3,218
    10-29-2014, 03:06 PM Go to last post
  2. How well a few values fit a given distribution?

    Dear all, I have approximated two one-dimensional random variables A and B using Gaussian Mixture Models (3 gaussians). I used...

    Started by eelioss‎, 10-24-2014 09:28 AM
    • Replies: 1
    • Views: 2,616
    10-28-2014, 04:56 AM Go to last post
  3. Do you like this measure for status inconsistency?

    For my thesis I have a variable named 'status inconsistency', so I want to compare people whose income or profession doesnt allign with their...

    Started by Annvdb‎, 10-28-2014 12:35 AM
    spss, status inconsistency
    • Replies: 0
    • Views: 1,819
    10-28-2014, 12:35 AM Go to last post
  4. Chi-square influential categories

    I have counts of events in a number of categories and an a priori expected frequency for those events. Clearly, this is a standard chi-squared. ...

    Started by bioniclime‎, 10-27-2014 12:05 PM
    chi-square test, influence
    • Replies: 3
    • Views: 1,797
    10-27-2014, 03:55 PM Go to last post
  5. Question Are they misunderstanding ANOVAs here?

    Hi, Here's an extract from a paper I'm using in a systematic review: The mean GAD-7 score of the sample prior to the course was 10.98 (SD 5.17,...

    Started by fishfishfish3‎, 10-23-2014 11:56 AM
    anova, post hoc
    • Replies: 8
    • Views: 2,585
    10-24-2014, 11:22 AM Go to last post
  6. Repeated measures ANOVA vs. Mixed Models

    Hi, I'm trying to analyze the results of my Master Thesis with SPSS. I've 3 experimental conditions (factor: Group) and for variable A every...

    Started by Lullabi_8888‎, 10-24-2014 03:38 AM
    mixed models, repeated measure anova
    • Replies: 0
    • Views: 1,816
    10-24-2014, 03:38 AM Go to last post
  7. Data analysis : replication and pseudoreplication

    I have several questions concerning analysis of data, especially when there are replications and/or pseudoreplications. First, I read an example...

    Started by statah‎, 10-23-2014 08:41 PM
    • Replies: 0
    • Views: 2,462
    10-23-2014, 08:41 PM Go to last post
  8. I need to test within and between factors at the same time. Which test should I use?

    Hi everyone, I'm trying to analyze the results of my Master Thesis with SPSS. I've 3 experimental conditions (factor: Group) and every subject in...

    Started by Lullabi_8888‎, 10-23-2014 03:31 PM
    non-parametric anova, repeated measure anova
    • Replies: 0
    • Views: 1,629
    10-23-2014, 03:31 PM Go to last post
  9. Can anyone help me choose appropriate form(s) of analysis?

    Hi, I was wondering if anyone could possibly help advise me on choosing an appropriate form of analysis I have 2 groups of participants....

    Started by Kenny‎, 10-19-2014 12:05 PM
    • Replies: 6
    • Views: 2,896
    10-23-2014, 03:35 AM Go to last post
  10. item-scale correlation

    Hi, When running an item-scale correlation, what does it mean when research have corrected for overlap? Is there a way to do this in SAS?

    Started by proc1125‎, 10-02-2014 04:49 PM
    • Replies: 13
    • Views: 5,200
    10-21-2014, 12:19 PM Go to last post
  11. Which regression model should I apply?

    Dear all, I want to do an empirical analysis on the risk-return characteristics of venture capital investments across industries applying a...

    Started by rüdiwörns‎, 10-18-2014 02:21 AM
    cox regression, model, regression, venture capital
    • Replies: 0
    • Views: 1,585
    10-18-2014, 02:21 AM Go to last post
  12. paired sample t-test vs. repeated measures ANOVA

    I think that the Psychology Research forum is more appropriate so I moved my question there--I could not figure out how to delete this thread. Thank...

    Started by jmmu‎, 10-17-2014 08:03 PM
    anova, repeated measures anova, t-test
    • Replies: 0
    • Views: 2,730
    10-17-2014, 08:03 PM Go to last post
  13. error propagation

    I have a point estimate of quantity 'A' and an associated standard error. If I calculate a new quantity (= ln-transformed 'A' multiplied by a...

    Started by JFS‎, 10-15-2014 01:09 PM
    log transformation, standard error
    • Replies: 0
    • Views: 1,943
    10-15-2014, 01:09 PM Go to last post
  14. Which stats test should I use?

    Hi, I have a question regarding which stats test to use. I want to look at the relationship between attitudes and satisfaction controlling for...

    Started by pero93af‎, 10-15-2014 08:13 AM
    • Replies: 1
    • Views: 1,891
    10-15-2014, 09:36 AM Go to last post
  15. Possible stats tests to use?

    Hi, After racking my brain not knowing what to do with my data I thought I'd give it a shot and post here, as I'm still unsure what I can do to...

    Started by Seethelios‎, 10-12-2014 05:50 PM
    biology, lifespan, movement, non-parameteric, survival
    • Replies: 1
    • Views: 3,686
    10-13-2014, 05:19 AM Go to last post
  16. Unhappy MBE, RMSE of two series of data, correlation.

    I have a series of Data generated as output of a mathematical model which I already know the MBE and RMSE (real measured values and simulated ones by...

    Started by bpivotto‎, 10-10-2014 07:10 AM
    correlation analysis, mbe, rmse
    • Replies: 1
    • Views: 3,468
    10-10-2014, 07:10 AM Go to last post
  17. Question Control Range - Specify appropriate terminology

    The measurement of a parameter have been assigned to fall within a certain range, say 40 to 80. We call this the control range. If a measurement is...

    Started by scantor1451‎, 10-08-2014 06:30 AM
    • Replies: 0
    • Views: 1,628
    10-08-2014, 06:30 AM Go to last post
  18. cronbach alpha for missing data

    Hi, I have an indicator which consists of questions 24, 25, 27, 29, 30, 31, and 32. I am in the middle of determining internal consistency and...

    Started by proc1125‎, 10-07-2014 06:25 PM
    • Replies: 0
    • Views: 2,718
    10-07-2014, 06:25 PM Go to last post
  19. p-value and estimation of parameters with non linear least squares

    Hi I am performing an estimation of some parameters . I Have the next data: age force_of Mortality(x) 49 0.00549 51 0.00509 52 0.00630...

    Started by sanmath‎, 10-07-2014 09:33 AM
    • Replies: 0
    • Views: 2,589
    10-07-2014, 09:33 AM Go to last post
  20. Standard Errors of Random Error

    Asking for help regarding Random errors Given that my model entails Ui which follows Normal (0, u^2), I ran SAS to estimate the random error (u^2)...

    Started by sk6398‎, 10-07-2014 03:31 AM
    random error, standard error
    • Replies: 0
    • Views: 1,950
    10-07-2014, 03:31 AM Go to last post
  21. 3x3 factorial design, repeated outcome measure

    I have a 3x3 factorial design (3 levels of treatment and 3 different environments) - the outcome is a repeated measurement taken at every week - the...

    Started by oncearunner‎, 10-06-2014 05:29 PM
    • Replies: 1
    • Views: 2,856
    10-07-2014, 02:53 AM Go to last post
  22. Relative Risk calculation

    Hi bit of help would be much appreciated for what is probably a bit of a silly question. I am trying to calculate relative risks of an adverse...

    Started by asaleh‎, 09-29-2014 06:27 AM
    • Replies: 6
    • Views: 2,887
    10-06-2014, 04:41 PM Go to last post
  23. Seek help to test my hypotheses (SEM)

    Hello. Hope im in the right place. i have a project that i shall submit soon. and this is the first time that i make such a research. in the...

    Started by rawanassaf‎, 10-06-2014 09:12 AM
    • Replies: 0
    • Views: 1,721
    10-06-2014, 09:12 AM Go to last post
  24. Interpreting continuous-dummy variable interactions

    Hi everyone, I just want to understand definitively how to interpret coefficients on continuous variable-dummyvariable interaction terms. Say my...

    Started by jfclogston‎, 10-05-2014 12:04 PM
    • Replies: 0
    • Views: 2,511
    10-05-2014, 12:04 PM Go to last post
  25. is validation really required

    I have time series data of about 150 sample and 8 variables. It is used to generate a interaction network, whose exact structure is not known yet. ...

    Started by ice‎, 09-29-2014 02:39 PM
    • Replies: 0
    • Views: 1,678
    09-29-2014, 02:39 PM Go to last post
  26. calculating sample size for multi-stage or multiphase experiment

    Hi everyone, I am running into a problem that I'm not sure how to solve. Due to budget constraints, we have 5 companies that are willing to...

    Started by proc1125‎, 09-29-2014 02:02 PM
    • Replies: 0
    • Views: 1,865
    09-29-2014, 02:02 PM Go to last post
  27. Multivariate nonparametric comparison

    I want to test whether two objects are similar or not. I have multivariate samples like this: Object1: X1, Y1, Z1, etc. Object2: X2, Y2, Z2,...

    Started by pkt‎, 09-29-2014 03:22 AM
    multivariate, nonparametric
    • Replies: 0
    • Views: 1,539
    09-29-2014, 03:22 AM Go to last post
  28. Random survey for crowd-sourcing similarities

    Hi all I have a data set of around 5,000 items that I need to test how similar or dissimilar people see each item as being from each other. In...

    Started by pwiseman001‎, 09-26-2014 11:38 PM
    crowd-sourcing, random, survey design
    • Replies: 0
    • Views: 1,853
    09-26-2014, 11:38 PM Go to last post
  29. panel data correlation

    I am working on paneldata (xtset firm date). Before starting my regression analyses, I want to construct a Pearson Correlation Matrix between the...

    Started by Dokla‎, 09-25-2014 04:48 AM
    • Replies: 0
    • Views: 1,736
    09-25-2014, 04:48 AM Go to last post
  30. Correlation between non-independent variables

    Hi, I want to conduct correlation between two variables, that have common term (difference scores). Originally there are three variables X, Y,...

    Started by random_guest‎, 09-17-2014 06:14 PM
    • Replies: 6
    • Views: 3,009
    09-24-2014, 11:15 AM Go to last post
  31. non parametric multiple comparison

    Hello I am doing statistical analysis on my research data and the data is not normal. So I used Kruskal Wallis test for finding whether treatments...

    Started by rzs0034‎, 09-22-2014 11:08 AM
    • Replies: 3
    • Views: 3,638
    09-23-2014, 01:27 AM Go to last post
  32. Question Longitudinal weighting

    Hi all. Wish you all well. I have to do weighting for an alcohol longitudinal study(2011-2013). How do I go about getting the final weights? ...

    Started by kcwong5‎, 09-23-2014 12:30 AM
    longitudinal, weighting
    • Replies: 0
    • Views: 2,652
    09-23-2014, 12:30 AM Go to last post
  33. Which statistical test?

    Hi I am currently writing my bachelorthesis. The subject is bankruptcy models. There are model 1, 2 en 3 that can predict a bankruptcy of a...

    Started by Isaak‎, 07-08-2014 10:07 AM
    • Replies: 1
    • Views: 2,101
    09-22-2014, 11:22 PM Go to last post
  34. Power and Alpha combinations for same sample size

    Let's say I have a sample size established with alpha=0.05 and power=0.8 (based on time constraint for study). So, the same sample size can be...

    Started by vladmalik‎, 09-20-2014 12:20 AM
    power alpha sample size
    • Replies: 2
    • Views: 1,722
    09-22-2014, 09:27 PM Go to last post
  35. Relative aggression index - what's the best way to compose it?

    I study the international conflicts, and there is a dataset where all the official actions of one state towards another are registered. They are of...

    Started by David Pekker‎, 09-22-2014 09:23 AM
    • Replies: 0
    • Views: 1,786
    09-22-2014, 09:23 AM Go to last post
  36. Does ANOVA tell which group is more /less than the other , or just they are different

    I was reading a peer reviewed paper titled: (Going hybrid: An analysis of consumer purchase motivations) where the authors used factor analysis...

    Started by Khalid‎, 09-20-2014 01:42 PM
    anova, factor analysis
    • Replies: 2
    • Views: 2,176
    09-21-2014, 09:31 AM Go to last post
  37. Which test?

    I am trying desperately to figure out which test I should use. I want to test if self-efficacy survey results and/or internship opportunities result...

    Started by AMarbutt‎, 09-20-2014 04:52 PM
    • Replies: 1
    • Views: 2,058
    09-21-2014, 06:15 AM Go to last post
  38. Measuring change for longitudinal study

    Hi all Is there an analysis method to measure the significance of magnitude change overtime (longitudinal study)? For example: Person A...

    Started by chinglnc‎, 09-19-2014 04:37 AM
    • Replies: 0
    • Views: 1,660
    09-19-2014, 04:37 AM Go to last post
  39. Post Calculating Effect Sizes for Meta Analysis

    Hey there! We are conducting a meta analysis (Hunter Schmidt Method) and therefore need to calculate the effect sizes of the different researches...

    Started by socialpsychology‎, 09-18-2014 05:16 AM
    • Replies: 0
    • Views: 1,575
    09-18-2014, 05:16 AM Go to last post
  40. Good Book on Mathematical Statistics

    I'm a mostly self-trained analyst with degrees in the social sciences but not in statistics. I'm looking to improve my knowledge of the mathematics...

    Started by elanmorin‎, 08-27-2014 03:08 PM
    • Replies: 9
    • Views: 2,855
    09-17-2014, 07:09 AM Go to last post
  41. Multilevel (hierarchical) logistic model

    Dear all, I hope there's somebody who can help me. I know the basic concepts of hierarchical logistic regression and I am confused. Here is the...

    Started by Nath75‎, 09-17-2014 04:03 AM
    • Replies: 0
    • Views: 1,792
    09-17-2014, 04:03 AM Go to last post
  42. API for Australian Bureau of Statistics

    Ok so there are APIs for US census data where you feed it geodata and get back a whole bunch of demographics data back. I use...

    Started by Lazar‎, 09-16-2014 06:26 PM
    api, gis
    • Replies: 0
    • Views: 2,534
    09-16-2014, 06:26 PM Go to last post
  43. Path coefficient comparisons among non-nested SEM models

    I am trying to compare three alternative, non-nested SEM models (using same sample, predicting same outcomes). I want something more targeted than an...

    Started by Miles11‎, 09-13-2014 01:26 PM
    • Replies: 2
    • Views: 2,302
    09-13-2014, 04:46 PM Go to last post
  44. Transformations Log, Square root when to use, when not to use

    Hi, I am new to research and statistics but have spent a lot of time reading textbooks and I understand the basics. My question, is as follows. ...

    Started by Nic_bnt‎, 09-13-2014 11:13 AM
    • Replies: 0
    • Views: 1,604
    09-13-2014, 11:13 AM Go to last post
  45. modern methods data collection

    Please can you help me by showing some of the most advanced methods in data collection for surveys or census.I mean using technology like tablets or...

    Started by drunkenphd‎, 09-11-2014 02:59 AM
    • Replies: 0
    • Views: 1,854
    09-11-2014, 02:59 AM Go to last post
  46. Multiple Inter-Correlated Binomial Events with only One Event Possible for Success

    Hi you’ll, I have a thought problem that might not have an easy/correct answer. It looks to be a Bayesian at first glance – and it might be –...

    Started by SombreNote‎, 09-08-2014 12:27 PM
    bayesian, binomial, dependent correlations, modeling, probability
    • Replies: 0
    • Views: 1,890
    09-08-2014, 12:27 PM Go to last post
  47. Plot Characterization

    Hi all, I am plotting voltage errors (Y) vs positions (X) X values are always sequential and ordered ascending I am concerned primarily with...

    Started by asuwish4‎, 09-08-2014 10:22 AM
    analysis, characterization, linearity, plot
    • Replies: 0
    • Views: 1,512
    09-08-2014, 10:22 AM Go to last post
  48. Mean Ranks

    Hi all, Can someone help me to understand what mean rank scores actually mean once you've completed a mann-whitney test or wallis test? For...

    Started by Templean‎, 09-07-2014 11:01 PM
    • Replies: 2
    • Views: 2,497
    09-08-2014, 10:02 AM Go to last post
  49. A question about Multiple imputations

    If I use multiple imputations to complete missing values in a certain variable, can I later use the imputated variable in another imputation (to...

    Started by SD1‎, 09-08-2014 05:53 AM
    missing values, multiple imputations
    • Replies: 1
    • Views: 1,933
    09-08-2014, 08:02 AM Go to last post
  50. Basic stats research question

    Say that I have two collections of data. The first is a background collection, where I gather two sets of features f1_b: N1xd1, and f2_b: N1xd2. ...

    Started by ml_researcher‎, 09-04-2014 01:10 PM
    background probability
    • Replies: 0
    • Views: 1,487
    09-04-2014, 01:10 PM Go to last post
  51. Degrees of freedom for Chi2 normality test

    I have found mixed information in regard to the number of degrees of freedom used to evaluate the chi2 statistics derived to check the normality of a...

    Started by Riccardo‎, 09-01-2014 04:31 PM
    chi square, chi square test, degrees of freedom, normality test
    • Replies: 3
    • Views: 3,105
    09-02-2014, 12:49 AM Go to last post
  52. Moral Dilemma Scenarios - How to measure different options?

    In a survey sent to business school students I want to measure predictors of ethical behavioral intentions. I have several latent independent...

    Started by Argenfels‎, 08-31-2014 10:10 AM
    • Replies: 0
    • Views: 1,516
    08-31-2014, 10:10 AM Go to last post
  53. Mann-Whitney Test

    Hi all, I've got some data that contains dichotomous independent variables and ordinal dependent variables. As a result, I think the only test...

    Started by Templean‎, 08-30-2014 02:10 PM
    • Replies: 3
    • Views: 1,790
    08-30-2014, 04:58 PM Go to last post
  54. Comparison quantity with mean values and measurement uncertainty

    Hi !! I need help in a problem. I measured a quantity Q from the area A of a peak (normally distributed) divide by two factors. The uncertainty...

    Started by zana‎, 08-30-2014 10:47 AM
    anova, measurement
    • Replies: 0
    • Views: 1,602
    08-30-2014, 10:47 AM Go to last post
  55. Longitudinal Growth Curve Modeling, basic question

    Can't remember basic aspect of growth curve modeling. I just ran my unconditional model and have non significant means for the intercept and slope...

    Started by tdelucca‎, 08-29-2014 12:57 PM
    • Replies: 0
    • Views: 1,549
    08-29-2014, 12:57 PM Go to last post
  56. Is this variable ordinal or categorical - which test?

    Hi, I'm not sure if this variable classifies as an ordinal or categorical DV, due to this issue I'm havign and therefore, I'm unsure which stats...

    Started by Fran2014‎, 08-29-2014 10:07 AM
    ordinal categorical test
    • Replies: 3
    • Views: 2,098
    08-29-2014, 11:22 AM Go to last post
  57. Symbolic Regression applied to multiple time series - risk of spurious regression?

    Hello together, I want to build a predictive model for sales data, and herefore I want to analyze sales data and its correlations with other time...

    Started by Mi_Ko‎, 08-27-2014 09:49 AM
    multivariate, symbolic regression, time series analysis
    • Replies: 0
    • Views: 2,407
    08-27-2014, 09:49 AM Go to last post
  58. Probability of Default

    Hi all, I'm doing a project to predict probability of delinquent for individual loans. Seems the model I fit is not good and I want to improve the...

    Started by sufeipopo‎, 08-20-2014 02:19 PM
    • Replies: 2
    • Views: 2,678
    08-25-2014, 08:23 AM Go to last post
  59. Statistical Science Competitions: Best Kept Secret

    You think that all the interesting competitions are taking place on Kaggle. But whether you are a participant interested in winning an award, or an...

    Started by vincentg64‎, 08-24-2014 11:49 PM
    • Replies: 0
    • Views: 1,344
    08-24-2014, 11:49 PM Go to last post
  60. Population vs sample in observational study

    Hi, I am trying to measure the effect of a treatment on a group which has not been randomly selected. I am using the propensity score matching...

    Started by cblanc‎, 08-24-2014 07:59 PM
    • Replies: 0
    • Views: 1,795
    08-24-2014, 07:59 PM Go to last post

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