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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: 19,447
    10-11-2014, 12:02 PM Go to last post
  1. 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: 2,052
    08-24-2014, 02:17 PM Go to last post
  2. 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: 1,385
    08-23-2014, 09:23 AM Go to last post
  3. 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: 1,100
    08-22-2014, 08:45 AM Go to last post
  4. 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: 1,324
    08-19-2014, 01:59 PM Go to last post
  5. True slope coefficient - help needed

    To be deleted !

    Started by Rako92‎, 08-18-2014 02:44 PM
    • Replies: 0
    • Views: 1,992
    08-18-2014, 02:44 PM Go to last post
  6. 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: 3,018
    08-18-2014, 07:12 AM Go to last post
  7. 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: 2,801
    08-17-2014, 01:53 PM Go to last post
  8. 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: 1,474
    08-17-2014, 09:50 AM Go to last post
  9. 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: 1,516
    08-17-2014, 05:46 AM Go to last post
  10. 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: 1,306
    08-17-2014, 04:21 AM Go to last post
  11. 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: 1,403
    08-16-2014, 08:34 PM Go to last post
  12. 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: 1,167
    08-16-2014, 05:21 PM Go to last post
  13. 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: 1,366
    08-16-2014, 03:44 PM Go to last post
  14. 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: 1,758
    08-15-2014, 08:48 AM Go to last post
  15. 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: 1,271
    08-14-2014, 09:25 PM Go to last post
  16. 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: 2,782
    08-14-2014, 02:35 PM Go to last post
  17. 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: 1,158
    08-14-2014, 02:11 PM Go to last post
  18. 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: 1,491
    08-14-2014, 07:49 AM Go to last post
  19. 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: 1,393
    08-14-2014, 07:27 AM Go to last post
  20. 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: 1,667
    08-14-2014, 02:34 AM Go to last post
  21. 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: 3,623
    08-13-2014, 10:57 AM Go to last post
  22. 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: 1,705
    08-12-2014, 11:16 AM Go to last post
  23. 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: 1,737
    08-10-2014, 11:17 AM Go to last post
  24. (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: 1,430
    08-08-2014, 02:55 PM Go to last post
  25. 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: 909
    08-06-2014, 05:48 PM Go to last post
  26. 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: 1,680
    08-06-2014, 02:05 PM Go to last post
  27. 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: 1,183
    08-06-2014, 09:10 AM Go to last post
  28. 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: 1,119
    08-06-2014, 02:12 AM Go to last post
  29. 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: 2,101
    08-05-2014, 08:22 AM Go to last post
  30. 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: 1,231
    08-05-2014, 07:32 AM Go to last post
  31. 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: 1,363
    08-05-2014, 12:47 AM Go to last post
  32. 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: 1,344
    08-04-2014, 03:08 PM Go to last post
  33. 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: 1,453
    08-04-2014, 12:27 PM Go to last post
  34. 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: 3,209
    08-03-2014, 10:56 PM Go to last post
  35. 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: 1,901
    08-03-2014, 06:43 PM Go to last post
  36. 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: 4,866
    08-03-2014, 04:53 PM Go to last post
  37. 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: 2,210
    08-03-2014, 05:07 AM Go to last post
  38. 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: 1,914
    08-03-2014, 02:52 AM Go to last post
  39. 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: 2,088
    08-02-2014, 03:39 AM Go to last post
  40. 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: 1,025
    07-31-2014, 12:42 PM Go to last post
  41. 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: 1,182
    07-31-2014, 06:08 AM Go to last post
  42. 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: 1,380
    07-30-2014, 06:18 PM Go to last post
  43. 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: 978
    07-30-2014, 08:37 AM Go to last post
  44. 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: 1,380
    07-30-2014, 05:19 AM Go to last post
  45. 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: 1,159
    07-30-2014, 05:01 AM Go to last post
  46. 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: 1,137
    07-30-2014, 04:26 AM Go to last post
  47. 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: 1,233
    07-29-2014, 09:02 AM Go to last post
  48. 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: 1,266
    07-29-2014, 07:36 AM Go to last post
  49. 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: 2,316
    07-29-2014, 07:15 AM Go to last post
  50. MANOVA versus t-tests : unconsistent results

    Hi, here is my problem. I am trying to compare the change on a language measure from time 1 to time 2 between 2 groups. If i do a repeated...

    Started by maxmon89‎, 07-27-2014 02:38 PM
    • Replies: 3
    • Views: 2,074
    07-29-2014, 12:48 AM Go to last post
  51. Having a hard time deciding on what test to use for data

    Here is the premise: There are large events taking place on park land. We are using noise disturbance hardware to measure decibels during and not...

    Started by NPS‎, 07-28-2014 09:37 AM
    large sample size, mann whitney
    • Replies: 6
    • Views: 1,977
    07-28-2014, 02:05 PM Go to last post
  52. AR(1) Model: Are the results the same?

    Suppose we have 23 observations, with time t=1,2,...,23. The dataset has 3 variable, t (time), x (independent) and y (dependent). The dependent ...

    Started by swing‎, 07-27-2014 01:32 PM
    • Replies: 0
    • Views: 3,622
    07-27-2014, 01:32 PM Go to last post
  53. measure of association

    I want to explain more my problematic. I have a robot and i am clapping in order that the robot goes forward, back, left and right. The problem is...

    Started by carlajosef‎, 07-27-2014 02:05 AM
    • Replies: 0
    • Views: 871
    07-27-2014, 02:05 AM Go to last post
  54. What are some data mining techniques for analyzing cause of disease

    I have a dataset of 300 observations, of which 200 are normal, and the rest have the disease. I have the cognitive assessment scores of these 300...

    Started by randomcat‎, 07-27-2014 12:13 AM
    data analysis
    • Replies: 1
    • Views: 1,312
    07-27-2014, 12:31 AM Go to last post
  55. Power Analysis with limited information

    Hi all, I am trying to determine how many groups per cell I need in 8 cells. The study I'm basing the analysis on reports the number of groups per...

    Started by g2007‎, 07-26-2014 05:31 PM
    • Replies: 0
    • Views: 1,083
    07-26-2014, 05:31 PM Go to last post
  56. Comparing time curves for two groups in research.

    Hello, I am creating time curves (experimentally) for two groups of mice (f(t) and y(t)): number of particular cells (in murine blood, per ml of...

    Started by bondsergey‎, 07-25-2014 08:27 AM
    statistical research
    • Replies: 3
    • Views: 1,911
    07-25-2014, 11:45 AM Go to last post
  57. Post-hoc power analysis

    I have analyzed data by performing a regression model in three steps - (a) two psychological independent variables, (b) adding a political...

    Started by Vasily_Kot‎, 07-19-2014 10:09 AM
    • Replies: 2
    • Views: 2,830
    07-24-2014, 11:03 AM Go to last post
  58. Top AIC model with no significant parameter estimates

    Hello, I am working on a project in which my top model has normal looking standard errors, but all of the parameter estimates overlap zero,...

    Started by mikad‎, 07-23-2014 10:01 AM
    • Replies: 6
    • Views: 1,908
    07-24-2014, 08:23 AM Go to last post
  59. Is there a test...

    Hi there! I have a new work project and I'm finding it challenging to select the approriate test. I'm not even sure if the right test exists so...

    Started by danib‎, 07-23-2014 03:04 PM
    • Replies: 5
    • Views: 1,945
    07-23-2014, 10:54 PM Go to last post
  60. sample size calculation with ratings/instances nested within each subject

    Hi, As a brief background, each subject is rating all his/her activities within the day (called instances). I want to calculate the sample size...

    Started by epiboy99‎, 07-21-2014 02:00 AM
    • Replies: 0
    • Views: 900
    07-21-2014, 02:00 AM Go to last post

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