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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 03:56 AM
    • Replies: 13
    • Views: 1,044
    09-17-2014, 06:52 AM Go to last post
  1. 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: 5
    • Views: 187
    Yesterday, 08:22 AM Go to last post
  2. 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: 98
    09-29-2014, 02:39 PM Go to last post
  3. 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: 101
    09-29-2014, 02:02 PM Go to last post
  4. 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: 76
    09-29-2014, 03:22 AM Go to last post
  5. 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: 122
    09-26-2014, 11:38 PM Go to last post
  6. 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: 142
    09-25-2014, 04:48 AM Go to last post
  7. 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: 303
    09-24-2014, 11:15 AM Go to last post
  8. 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: 150
    09-23-2014, 01:27 AM Go to last post
  9. 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: 69
    09-23-2014, 12:30 AM Go to last post
  10. 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: 207
    09-22-2014, 11:22 PM Go to last post
  11. 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: 128
    09-22-2014, 09:27 PM Go to last post
  12. 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: 67
    09-22-2014, 09:23 AM Go to last post
  13. 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: 181
    09-21-2014, 09:31 AM Go to last post
  14. 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: 163
    09-21-2014, 06:15 AM Go to last post
  15. 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: 139
    09-19-2014, 04:37 AM Go to last post
  16. 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: 101
    09-18-2014, 05:16 AM Go to last post
  17. 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: 377
    09-17-2014, 07:09 AM Go to last post
  18. 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: 123
    09-17-2014, 04:03 AM Go to last post
  19. 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: 131
    09-16-2014, 06:26 PM Go to last post
  20. 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: 194
    09-13-2014, 04:46 PM Go to last post
  21. 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: 129
    09-13-2014, 11:13 AM Go to last post
  22. 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: 148
    09-11-2014, 02:59 AM Go to last post
  23. 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: 161
    09-08-2014, 12:27 PM Go to last post
  24. 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: 105
    09-08-2014, 10:22 AM Go to last post
  25. 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: 161
    09-08-2014, 10:02 AM Go to last post
  26. 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: 105
    09-08-2014, 08:02 AM Go to last post
  27. 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: 148
    09-04-2014, 01:10 PM Go to last post
  28. 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: 258
    09-02-2014, 12:49 AM Go to last post
  29. 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: 190
    08-31-2014, 10:10 AM Go to last post
  30. 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: 276
    08-30-2014, 04:58 PM Go to last post
  31. 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: 165
    08-30-2014, 10:47 AM Go to last post
  32. 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: 183
    08-29-2014, 12:57 PM Go to last post
  33. 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: 154
    08-29-2014, 11:22 AM Go to last post
  34. 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: 132
    08-27-2014, 09:49 AM Go to last post
  35. 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: 298
    08-25-2014, 08:23 AM Go to last post
  36. 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: 166
    08-24-2014, 11:49 PM Go to last post
  37. 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: 139
    08-24-2014, 07:59 PM Go to last post
  38. Methodology Question: IVs - org elvel, DV - individ level aggregated to org level

    Hello everybody, Please help me with the following issue. Consider the attached model. All the IVs at both stages (Xs and Ys) are at...

    Started by kiton‎, 08-21-2014 12:01 PM
    • Replies: 2
    • Views: 180
    08-24-2014, 02:17 PM Go to last post
  39. How to calculate standard error for win rates of sampled data

    Hi Forum, I'm working on a problem regarding win rates and can't find a good solution for calculation of standard error of my results. I have...

    Started by JamesP‎, 08-23-2014 09:23 AM
    deviation, samples size, standard error, win rates
    • Replies: 0
    • Views: 172
    08-23-2014, 09:23 AM Go to last post
  40. Post [ASK] [Quantification Theory Type I] Kansei Engineering Reference

    Hi everyone i've been doing a research about kansei engineering for automobile product, and to analyze the data, i need to perform quantification...

    Started by Gema‎, 08-23-2014 12:44 AM
    • Replies: 0
    • Views: 178
    08-23-2014, 12:44 AM Go to last post
  41. Principal Components Analysis

    Hello everybody, I have 15 time series consisting of returns on classic asset class investment (Stocks, Bonds, etc.) and some more advanced...

    Started by Bagira‎, 08-22-2014 08:45 AM
    • Replies: 0
    • Views: 143
    08-22-2014, 08:45 AM Go to last post
  42. Repeated measures design question

    Hi all, It's been a while since I've been involved with statistics and was hoping to be pointed in the right direction. I have a data set...

    Started by GStein‎, 08-19-2014 01:59 PM
    • Replies: 0
    • Views: 154
    08-19-2014, 01:59 PM Go to last post
  43. True slope coefficient - help needed

    To be deleted !

    Started by Rako92‎, 08-18-2014 02:44 PM
    • Replies: 0
    • Views: 152
    08-18-2014, 02:44 PM Go to last post
  44. Paired Vs unpaired t-test - which one to use?

    Good morning, I am a little stuck - I understand the difference between the two tests and am happy with written examples in a stats book I found....

    Started by Emuk81‎, 08-18-2014 03:58 AM
    • Replies: 1
    • Views: 165
    08-18-2014, 07:12 AM Go to last post
  45. What kind of ANOVA is good for this

    Hello, In my research i've collected death % for cell cultures. One variable was the treatment used (0,2,4,10,16 exposure). Another one was the...

    Started by Blakey85‎, 08-16-2014 03:22 PM
    • Replies: 3
    • Views: 226
    08-17-2014, 01:53 PM Go to last post
  46. Need Help wih My College Assignment

    I need some help with my college assignment but I cannot find some reliable source. I want to get some help from cheap assignment writing service. Is...

    Started by maryjames‎, 08-17-2014 09:50 AM
    • Replies: 0
    • Views: 164
    08-17-2014, 09:50 AM Go to last post
  47. correlation with missing data

    I got a problem with correlating 2 signals x1,x2 (isgnal in time) with missing data. the missing data is periodic and is in both signals. my...

    Started by eyalenjoi‎, 08-17-2014 05:46 AM
    • Replies: 0
    • Views: 168
    08-17-2014, 05:46 AM Go to last post
  48. Correct methodology when not sure of linearity for continuous response variable

    I already posted on this, but haven't gotten an answer to my core question - which is, what type of statistical analysis should I run. I have...

    Started by bcrider‎, 08-16-2014 07:33 PM
    categorical iv, continuous dv, methodology
    • Replies: 1
    • Views: 189
    08-17-2014, 04:21 AM Go to last post
  49. Stores and ordered rank of products

    I have data about popularity of some products in some stores. For each of the stores I have only a ordered rank of best-selling products in them. I...

    Started by George P‎, 08-16-2014 12:21 PM
    data analysis, nonparametric statistics, ordered, ranks, test to use
    • Replies: 3
    • Views: 158
    08-16-2014, 08:34 PM Go to last post
  50. ANOVA and Tukey comparisions

    Hi! I'm using Minitab to run ANOVAs for a recent psycholinguistic experiment. My problem is that some interactions aren't even close to significant...

    Started by dochamer‎, 08-16-2014 05:21 PM
    • Replies: 0
    • Views: 134
    08-16-2014, 05:21 PM Go to last post
  51. Continuous response variable and categorical predictor - what type of analysis to use

    Hi, I am dealing with data in which the IV's are not easily partitioned - participants can belong to one, two+, or none of the categories for a given...

    Started by bcrider‎, 08-16-2014 12:53 PM
    analisys, linear regression, methodology
    • Replies: 4
    • Views: 187
    08-16-2014, 03:44 PM Go to last post
  52. Significance aside - correlation coefficient

    Hi everyone: It's been a while since I have posted here and I hope that I am posting in the right forum. In my field, sometimes people like to...

    Started by blue11‎, 08-14-2014 02:38 PM
    • Replies: 6
    • Views: 277
    08-15-2014, 08:48 AM Go to last post
  53. Question about splitting data

    I am wondering what the most common way to handle data is wherein a participant belongs to multiple groups. For example, if you're wanting to run...

    Started by bcrider‎, 08-14-2014 09:25 PM
    categorical data, regression analysis
    • Replies: 0
    • Views: 176
    08-14-2014, 09:25 PM Go to last post
  54. 4 simultaneous non-independent measures – should nested ANOVA work?

    Hi all, this is my first time posting here, but I’m very stuck. I have to analyze data from an animal behavior experiment. I have 3 strains, with 20...

    Started by anvee‎, 08-14-2014 02:35 PM
    animal behavior, behavioral experiment, jmp, nested anova, preference
    • Replies: 0
    • Views: 166
    08-14-2014, 02:35 PM Go to last post
  55. Difference in mean for compositional data

    How do you test for a different mean between groups in composititions?

    Started by Robert Power‎, 08-14-2014 02:11 PM
    compositional data, compositions
    • Replies: 0
    • Views: 141
    08-14-2014, 02:11 PM Go to last post
  56. Question about Methodology

    Hi everyone! I'm new here, and wanted some advice on a methodology I'm using for a study of mine. Due to some confidentiality requirements, I can't...

    Started by RTUrpin‎, 07-27-2014 07:42 AM
    • Replies: 2
    • Views: 244
    08-14-2014, 07:49 AM Go to last post
  57. Kolmogorov-Smirnov

    Hi, I have used a two sample kolmogorov-smirnov test to compare the distributions of two sets of data. I know that the K-S test is a non...

    Started by robblenk‎, 08-14-2014 05:56 AM
    kolmogorov-smirnov, parametric data
    • Replies: 2
    • Views: 225
    08-14-2014, 07:27 AM Go to last post
  58. Correct Use of Chi-Square?

    Hi all, I am trying to test whether one group is significantly different from another in two different collections of data. I have seen that...

    Started by Ogtos‎, 08-14-2014 02:34 AM
    • Replies: 0
    • Views: 194
    08-14-2014, 02:34 AM Go to last post
  59. Standardizing non-normally distributed data?

    Hi everyone, I'm working on a project at the moment that aims to compare subjects based on different characteristics. At the moment, I am looking...

    Started by Londoner‎, 08-13-2014 04:32 AM
    • Replies: 3
    • Views: 265
    08-13-2014, 10:57 AM Go to last post
  60. Conditional distribution for covariance matrix with constraint

    Hi, I'm trying to work out how to draw from the conditional distribution for a covariance matrix given some correlated multivariate Gaussian data....

    Started by graeme‎, 08-11-2014 10:41 PM
    • Replies: 2
    • Views: 252
    08-12-2014, 11:16 AM Go to last post

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