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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: 979
    09-17-2014, 06:52 AM Go to last post
  1. 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: 5
    • Views: 172
    Today, 10:51 AM Go to last post
  2. 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, Today 04:37 AM
    • Replies: 0
    • Views: 56
    Today, 04:37 AM Go to last post
  3. 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, Yesterday 05:16 AM
    • Replies: 0
    • Views: 73
    Yesterday, 05:16 AM Go to last post
  4. 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: 313
    09-17-2014, 07:09 AM Go to last post
  5. 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: 81
    09-17-2014, 04:03 AM Go to last post
  6. 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: 106
    09-16-2014, 06:26 PM Go to last post
  7. 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: 154
    09-13-2014, 04:46 PM Go to last post
  8. 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: 108
    09-13-2014, 11:13 AM Go to last post
  9. 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: 116
    09-11-2014, 02:59 AM Go to last post
  10. 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: 128
    09-08-2014, 12:27 PM Go to last post
  11. 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: 85
    09-08-2014, 10:22 AM Go to last post
  12. 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: 145
    09-08-2014, 10:02 AM Go to last post
  13. 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: 87
    09-08-2014, 08:02 AM Go to last post
  14. 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: 128
    09-04-2014, 01:10 PM Go to last post
  15. 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: 231
    09-02-2014, 12:49 AM Go to last post
  16. 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: 158
    08-31-2014, 10:10 AM Go to last post
  17. 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: 237
    08-30-2014, 04:58 PM Go to last post
  18. 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: 140
    08-30-2014, 10:47 AM Go to last post
  19. 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: 170
    08-29-2014, 12:57 PM Go to last post
  20. 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: 137
    08-29-2014, 11:22 AM Go to last post
  21. 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: 118
    08-27-2014, 09:49 AM Go to last post
  22. 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: 279
    08-25-2014, 08:23 AM Go to last post
  23. 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: 149
    08-24-2014, 11:49 PM Go to last post
  24. 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: 123
    08-24-2014, 07:59 PM Go to last post
  25. 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: 163
    08-24-2014, 02:17 PM Go to last post
  26. 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: 149
    08-23-2014, 09:23 AM Go to last post
  27. 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: 156
    08-23-2014, 12:44 AM Go to last post
  28. 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: 129
    08-22-2014, 08:45 AM Go to last post
  29. 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: 141
    08-19-2014, 01:59 PM Go to last post
  30. True slope coefficient - help needed

    To be deleted !

    Started by Rako92‎, 08-18-2014 02:44 PM
    • Replies: 0
    • Views: 135
    08-18-2014, 02:44 PM Go to last post
  31. 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: 143
    08-18-2014, 07:12 AM Go to last post
  32. 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: 204
    08-17-2014, 01:53 PM Go to last post
  33. 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: 146
    08-17-2014, 09:50 AM Go to last post
  34. 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: 150
    08-17-2014, 05:46 AM Go to last post
  35. 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: 171
    08-17-2014, 04:21 AM Go to last post
  36. 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: 142
    08-16-2014, 08:34 PM Go to last post
  37. 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: 119
    08-16-2014, 05:21 PM Go to last post
  38. 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: 168
    08-16-2014, 03:44 PM Go to last post
  39. 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: 251
    08-15-2014, 08:48 AM Go to last post
  40. 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: 162
    08-14-2014, 09:25 PM Go to last post
  41. 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: 141
    08-14-2014, 02:35 PM Go to last post
  42. 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: 114
    08-14-2014, 02:11 PM Go to last post
  43. 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: 213
    08-14-2014, 07:49 AM Go to last post
  44. 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: 193
    08-14-2014, 07:27 AM Go to last post
  45. 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: 168
    08-14-2014, 02:34 AM Go to last post
  46. 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: 229
    08-13-2014, 10:57 AM Go to last post
  47. 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: 222
    08-12-2014, 11:16 AM Go to last post
  48. Best Method to Calculate P-Values for These Data?

    Hello. I am a first year chemistry Ph.D. student with very little statistics experience. I am working with biophysical data, performing statistical...

    Started by katherynpenrod‎, 08-07-2014 08:33 AM
    • Replies: 2
    • Views: 269
    08-10-2014, 11:17 AM Go to last post
  49. (Reasonable) way to simulate outliers?

    hi! so i've been wanting to tackle a project related to Spearman's rho through simulation and i think it would be reasonable to include an...

    Started by spunky‎, 08-08-2014 02:48 PM
    • Replies: 1
    • Views: 189
    08-08-2014, 02:55 PM Go to last post
  50. Random Sampling in Mixed Models

    Hi, I have a data set that contains 40 firms over 15 years with firm and individual level data, with the individuals being sample randomly from...

    Started by bmgustaf‎, 08-06-2014 05:48 PM
    hlm, mixed model, multilevel model, panel data
    • Replies: 0
    • Views: 153
    08-06-2014, 05:48 PM Go to last post
  51. Surival analysis STATA - splitting up the time analysis interval/sum stats

    I am analyzing a data set - analysis of newspaper failure- over a 55 year time span and also looking at a time span of the last ten years. My goal...

    Started by jfclogston‎, 08-06-2014 02:05 PM
    stata, stata10, survival analysis
    • Replies: 0
    • Views: 154
    08-06-2014, 02:05 PM Go to last post
  52. How many tests?

    Hi, I am trying to bridge a new reagent with an existing one so when the existing one runs out I can use the new one. I want to test the old and...

    Started by Emuk81‎, 08-06-2014 09:05 AM
    • Replies: 1
    • Views: 150
    08-06-2014, 09:10 AM Go to last post
  53. Querry

    Hi der, I am a beginner for SPSS, I wanted to do correlation, regression and multiple regression between set of variables. My difficulty in...

    Started by raghav‎, 08-06-2014 02:12 AM
    • Replies: 0
    • Views: 108
    08-06-2014, 02:12 AM Go to last post
  54. Correlation coefficient for zero inflated count data

    Hi, I would like to ask what is the proper correlation coefficient to use for count data and for zero inflated count data. would Kendall tau do...

    Started by Statnoob1‎, 08-05-2014 08:22 AM
    correlation, count data, zero-inflation
    • Replies: 0
    • Views: 202
    08-05-2014, 08:22 AM Go to last post
  55. ANOVA with repeated measurement: multivariate tests; MANOVA for repeated measures

    Hello everyone I need help with my analysis of variance with repeated measurement. I did a study where I measured 6 values of every participant...

    Started by Lönneberga‎, 08-05-2014 07:32 AM
    • Replies: 0
    • Views: 137
    08-05-2014, 07:32 AM Go to last post
  56. Running regression for each cluster

    Is this common or reasonable? Run a k-means cluster analysis and then do a separate logistic regression for each cluster? For simplicity, let's...

    Started by jawon‎, 08-04-2014 01:07 PM
    • Replies: 1
    • Views: 219
    08-05-2014, 12:47 AM Go to last post
  57. comparing simulated and experimental data

    Hi All, I generated a time series data by simulation (each condition has been generated time condition1 condition2 condition3 .... ...

    Started by Rman‎, 08-04-2014 03:08 PM
    compare groups, correlation, experimental, simulated_data
    • Replies: 0
    • Views: 209
    08-04-2014, 03:08 PM Go to last post
  58. reference for representation of linear functionals of random variables

    I'm looking for a representation theorem for linear functionals of random variables. I'm not sure if Riesz–Markov–Kakutani does it, but it seems...

    Started by jamajor‎, 06-18-2014 01:43 PM
    functionals, random variables, riesz representation
    • Replies: 2
    • Views: 260
    08-04-2014, 12:27 PM Go to last post
  59. Which Tests?

    Hello! I am considering a study I'll note below, but have limited statistical experience. Accordingly I am seeking insights on which tests are...

    Started by zzehr‎, 08-02-2014 10:54 PM
    • Replies: 2
    • Views: 225
    08-03-2014, 10:56 PM Go to last post
  60. SEM Confidence Intervals and Repeated Measures

    I'm analysing data from a repeated measures study. All of my stats tests (ANOVA and non-parametric tests where appropriate) are telling me that the...

    Started by dumdeedum‎, 07-31-2014 01:19 PM
    • Replies: 3
    • Views: 254
    08-03-2014, 06:43 PM Go to last post

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