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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: 10
    • Views: 796
    07-12-2014, 06:46 PM Go to last post
  1. 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, Yesterday 10:10 AM
    • Replies: 0
    • Views: 72
    Yesterday, 10:10 AM Go to last post
  2. 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: 134
    08-30-2014, 04:58 PM Go to last post
  3. 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: 84
    08-30-2014, 10:47 AM Go to last post
  4. 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: 125
    08-29-2014, 12:57 PM Go to last post
  5. 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: 97
    08-29-2014, 11:22 AM Go to last post
  6. 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: 8
    • Views: 198
    08-27-2014, 05:27 PM Go to last post
  7. 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: 77
    08-27-2014, 09:49 AM Go to last post
  8. 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: 247
    08-25-2014, 08:23 AM Go to last post
  9. 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: 115
    08-24-2014, 11:49 PM Go to last post
  10. 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: 100
    08-24-2014, 07:59 PM Go to last post
  11. 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: 140
    08-24-2014, 02:17 PM Go to last post
  12. 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: 122
    08-23-2014, 09:23 AM Go to last post
  13. 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: 132
    08-23-2014, 12:44 AM Go to last post
  14. 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: 109
    08-22-2014, 08:45 AM Go to last post
  15. 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: 119
    08-19-2014, 01:59 PM Go to last post
  16. True slope coefficient - help needed

    To be deleted !

    Started by Rako92‎, 08-18-2014 02:44 PM
    • Replies: 0
    • Views: 108
    08-18-2014, 02:44 PM Go to last post
  17. 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: 117
    08-18-2014, 07:12 AM Go to last post
  18. 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: 187
    08-17-2014, 01:53 PM Go to last post
  19. 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: 114
    08-17-2014, 09:50 AM Go to last post
  20. 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: 136
    08-17-2014, 05:46 AM Go to last post
  21. 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: 156
    08-17-2014, 04:21 AM Go to last post
  22. 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: 127
    08-16-2014, 08:34 PM Go to last post
  23. 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: 106
    08-16-2014, 05:21 PM Go to last post
  24. 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: 152
    08-16-2014, 03:44 PM Go to last post
  25. 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: 216
    08-15-2014, 08:48 AM Go to last post
  26. 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: 146
    08-14-2014, 09:25 PM Go to last post
  27. 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: 114
    08-14-2014, 02:35 PM Go to last post
  28. 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: 85
    08-14-2014, 02:11 PM Go to last post
  29. 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: 180
    08-14-2014, 07:49 AM Go to last post
  30. 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: 146
    08-14-2014, 07:27 AM Go to last post
  31. 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: 122
    08-14-2014, 02:34 AM Go to last post
  32. 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: 175
    08-13-2014, 10:57 AM Go to last post
  33. 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: 170
    08-12-2014, 11:16 AM Go to last post
  34. 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: 229
    08-10-2014, 11:17 AM Go to last post
  35. (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: 155
    08-08-2014, 02:55 PM Go to last post
  36. 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: 128
    08-06-2014, 05:48 PM Go to last post
  37. 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: 119
    08-06-2014, 02:05 PM Go to last post
  38. 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: 119
    08-06-2014, 09:10 AM Go to last post
  39. 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: 71
    08-06-2014, 02:12 AM Go to last post
  40. 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: 146
    08-05-2014, 08:22 AM Go to last post
  41. 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: 96
    08-05-2014, 07:32 AM Go to last post
  42. 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: 179
    08-05-2014, 12:47 AM Go to last post
  43. 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: 194
    08-04-2014, 03:08 PM Go to last post
  44. 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: 246
    08-04-2014, 12:27 PM Go to last post
  45. 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: 205
    08-03-2014, 10:56 PM Go to last post
  46. 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: 228
    08-03-2014, 06:43 PM Go to last post
  47. Red face Interpreting Kruskal-Wallis results

    Hi all, I've just finished my undergrad thesis and the reviewers strongly recommended that I pursue formal publication of my results. I thought...

    Started by glenn.althor‎, 07-29-2014 09:47 PM
    • Replies: 10
    • Views: 353
    08-03-2014, 04:53 PM Go to last post
  48. GLMM - fitting random effects to a complex field design

    Dear forum users, I’d be very grateful to hear about any opinions on a problem I’m having with the random effects side of my generalised linear...

    Started by Mark Kusk‎, 08-02-2014 08:10 AM
    • Replies: 6
    • Views: 222
    08-03-2014, 05:07 AM Go to last post
  49. Which method to use? ANOVA, one way regression, or else?

    Hi guys, For my research I have an independent variable 'education', which varies from 1 (low) to 6 (high) and a dependent dummy variable which is...

    Started by CindyD93‎, 08-02-2014 04:05 AM
    anova, dummy, regression, spss
    • Replies: 7
    • Views: 265
    08-03-2014, 02:52 AM Go to last post
  50. SD diff

    Greetings. Kinda new in stats. Wanna know how do we calculate sd diff between two means. E.g. mean 1 = 319.2 sd 1=71.5 while mean 2 = 360.8...

    Started by natatmy‎, 08-02-2014 03:07 AM
    • Replies: 1
    • Views: 114
    08-02-2014, 03:39 AM Go to last post
  51. Comparing categorical data for a relationship - alternatives to a chi-square test?

    Hi Everyone, This is my first post here, and I am very new to statistical testing, so I'm going to try to make this question as clear as possible...

    Started by paulmccarney‎, 07-31-2014 12:42 PM
    categorical data analysis, chi-square, post hoc tests
    • Replies: 0
    • Views: 119
    07-31-2014, 12:42 PM Go to last post
  52. Testing of a normality (Shapiro-Wilk test)

    Hello, please I need advise on the testing of a normality. I have 5 types of objects in one diagram - grid, function, matrice, table and scalar for...

    Started by janea90‎, 07-31-2014 06:08 AM
    • Replies: 0
    • Views: 133
    07-31-2014, 06:08 AM Go to last post
  53. Can I impute an independent variable with a dependent varible?

    I'm building a regression model Y = X1 + X2 + ... + Xn There're about 10% subjects who have missing value on two of the predictors. If I use...

    Started by sunny3333‎, 07-30-2014 06:18 PM
    • Replies: 0
    • Views: 127
    07-30-2014, 06:18 PM Go to last post
  54. Meta-analysis: different information about relationships between two variables

    Hello everyone I need help with my meta-analysis. I have collected all the studies that I wish to include and would like to take Pearson's...

    Started by Metanic‎, 07-30-2014 06:39 AM
    coefficient, correlation, metaanalysis
    • Replies: 7
    • Views: 169
    07-30-2014, 08:37 AM Go to last post
  55. Manova with within-subject and between-subject factors (no repeated measures!)

    hello, i need to do a manova with one within-subject factor (veracity) and two between-subject factors (type of speaker and type of presentation)....

    Started by thesis‎, 07-30-2014 05:19 AM
    between-subject, manova, within-subject
    • Replies: 0
    • Views: 74
    07-30-2014, 05:19 AM Go to last post
  56. Delta method to assess the confidence and prediction intervals

    I want to calculate the table of confidence and prediction intervals for a custom Cumulative Distribution Function or CDF, and I am following the...

    Started by Jpalbae‎, 07-30-2014 05:01 AM
    • Replies: 0
    • Views: 82
    07-30-2014, 05:01 AM Go to last post
  57. Wink Comparing overall mean rankings - help?

    Hi there, I am wondering how I can compare overall ranking means, which I have seen in a previous study. They manage to conduct a chi-square...

    Started by samohsam‎, 07-30-2014 04:26 AM
    • Replies: 0
    • Views: 65
    07-30-2014, 04:26 AM Go to last post
  58. factor analysis

    Can I do a factor analysis with one dependent variable and one independent variable? Do I need to have at least two dependent variables to do a...

    Started by eunkum1‎, 07-28-2014 02:23 PM
    • Replies: 5
    • Views: 138
    07-29-2014, 09:02 AM Go to last post
  59. Not sure what to do with data

    Hello, i spent a very long time gathering data and now i need to write a paper about it. Unfortunately, i'm relatively new to statistical...

    Started by soylentgreen‎, 07-28-2014 03:09 PM
    • Replies: 3
    • Views: 143
    07-29-2014, 07:36 AM Go to last post
  60. Repeated Measures ANOVA and baseline control

    I’ve been asked to work on a cross-over design study for an MSc project. The study is looking at the effects of sleep deprivation on word recall....

    Started by loops22‎, 07-29-2014 05:40 AM
    • Replies: 4
    • Views: 147
    07-29-2014, 07:15 AM Go to last post

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